refactor(chat): route browser chat through one runtime

Co-Authored-By: Claude Opus 4.8 <[email protected]>
Claude-Session: https://claude.ai/code/session_01ESFAnh2t9HmLwng8oW95St

.gitignore

@@ -8,4 +8,18 @@ coverage
 .env.local
 *.tsbuildinfo
 .pnpm-store
+__pycache__/
 docs/reports/
+
+# Step-CA dev password — real file is gitignored; commit only the .example
+infra/step-ca/dev-password
+
+# Scratch dirs created by the framework git-wrapper shell test harnesses
+.mosaic-test-work/
+
+# Transient config files vite/vitest/esbuild write next to a *.config.ts while
+# loading it, then unlink. They are untracked but were not ignored, so turbo's
+# package traversal hashed them and intermittently failed CI with "Package
+# traversal error: ... .timestamp-*.mjs: No such file or directory" when the
+# file vanished mid-scan. Ignoring them removes the race.
+*.timestamp-*.mjs

.husky/pre-push

@@ -1 +1 @@
-pnpm typecheck && pnpm lint && pnpm format:check
+pnpm preflight && pnpm typecheck && pnpm lint && pnpm format:check

.npmrc

@@ -1 +1,5 @@
 @mosaicstack:registry=https://git.mosaicstack.dev/api/packages/mosaicstack/npm/
+# HOME resolves to /root in the ci-base image, preserving its warmed-store path.
+# Non-root checkouts use their own HOME. Override without editing this file via
+# NPM_CONFIG_STORE_DIR (pnpm's environment form of the store-dir setting).
+store-dir=${HOME}/.local/share/pnpm/store

.prettierignore

@@ -4,4 +4,15 @@ pnpm-lock.yaml
 **/node_modules
 **/drizzle
 **/.next
+# Python build/test artifacts — same category as node_modules/dist/.next above.
+# Prettier must never scan generated trees; without these a local venv poisons
+# `pnpm format:check` with thousands of third-party files.
+**/venv
+**/__pycache__
+**/.mypy_cache
+**/.pytest_cache
+**/htmlcov
 .claude/
+docs/tess/TASKS.md
+docs/scratchpads/
+packages/mosaic/src/fleet/testdata/documentation-publication-v1/inline-migration-v1.json

.woodpecker/ci-image.yml

@@ -0,0 +1,40 @@
+# Build & push the pre-baked CI base image (Dockerfile.ci) to the Gitea
+# registry CI already publishes to. Reuses the exact kaniko + auth pattern
+# from publish.yml (REGISTRY_USER/REGISTRY_PASS from_secret, /kaniko/.docker
+# config.json). Other pipelines (ci.yml, publish.yml) pull `ci-base:latest`
+# for their install step.
+#
+# Rebuild ONLY when the dependency set or the image recipe changes — a normal
+# code push must not trigger a 25-min image build. `path` applies to push/PR
+# events; `event: tag` (releases) rebuilds unconditionally so a tagged release
+# always ships a fresh base.
+when:
+  - event: tag
+  - event: [push, manual]
+    branch: main
+    path:
+      include:
+        - 'pnpm-lock.yaml'
+        - 'Dockerfile.ci'
+
+steps:
+  build-ci-base:
+    image: gcr.io/kaniko-project/executor:debug
+    environment:
+      REGISTRY_USER:
+        from_secret: gitea_username
+      REGISTRY_PASS:
+        from_secret: gitea_password
+      CI_COMMIT_BRANCH: ${CI_COMMIT_BRANCH}
+      CI_COMMIT_TAG: ${CI_COMMIT_TAG}
+      CI_COMMIT_SHA: ${CI_COMMIT_SHA}
+    commands:
+      - mkdir -p /kaniko/.docker
+      - echo "{\"auths\":{\"git.mosaicstack.dev\":{\"username\":\"$REGISTRY_USER\",\"password\":\"$REGISTRY_PASS\"}}}" > /kaniko/.docker/config.json
+      - |
+        # Lockfile-hash tag: an immutable identity for the exact dep set baked
+        # into this image. `:latest` is the mutable pointer pipelines consume.
+        LOCK_HASH=$(sha256sum pnpm-lock.yaml | cut -c1-12)
+        DESTINATIONS="--destination git.mosaicstack.dev/mosaicstack/stack/ci-base:latest"
+        DESTINATIONS="$DESTINATIONS --destination git.mosaicstack.dev/mosaicstack/stack/ci-base:lock-$LOCK_HASH"
+        /kaniko/executor --context . --dockerfile Dockerfile.ci $DESTINATIONS

.woodpecker/ci.yml

@@ -1,9 +1,20 @@
+# &node_image is the pre-baked CI base built by .woodpecker/ci-image.yml:
+# node:24-alpine + python3/make/g++/postgresql-client + pnpm + a warm pnpm
+# store. The install step resolves from the baked store (--prefer-offline)
+# instead of paying a ~731s cold fetch + native compile every run.
 variables:
-  - &node_image 'node:22-alpine'
+  - &node_image 'git.mosaicstack.dev/mosaicstack/stack/ci-base:latest'
   - &enable_pnpm 'corepack enable'
 
 when:
-  - event: [push, pull_request, manual]
+  # PR + manual CI run on any branch — the pull_request pipeline is the merge gate.
+  # push CI is restricted to protected branches (main) so a feature-branch push no
+  # longer fires a redundant SECOND pipeline alongside its PR pipeline. This ~halves
+  # CI load on the storage-constrained runner with zero loss of gating (branch
+  # protection requires no push/ci status context; main still gets full push CI).
+  - event: [pull_request, manual]
+  - event: push
+    branch: main
 
 # Turbo remote cache (turbo.mosaicstack.dev) is configured via Woodpecker
 # repository-level environment variables (TURBO_API, TURBO_TEAM, TURBO_TOKEN).
@@ -15,8 +26,47 @@ steps:
     image: *node_image
     commands:
       - corepack enable
-      - apk add --no-cache python3 make g++
-      - pnpm install --frozen-lockfile
+      # python3/make/g++ are baked into ci-base; --prefer-offline resolves from
+      # the baked pnpm store.
+      - pnpm install --frozen-lockfile --prefer-offline
+
+  # Blocking gate: public framework package must contain no operator-specific
+  # personal data or private $HOME defaults. Runs early (no node_modules needed).
+  sanitization:
+    image: *node_image
+    commands:
+      - apk add --no-cache bash
+      - bash packages/mosaic/framework/tools/quality/scripts/verify-sanitized.sh
+      # Resident line-count ceiling over framework-owned resident files
+      # (Constitution + dispatcher + each RUNTIME.md slice). See DESIGN §7 / R9.
+      - bash packages/mosaic/framework/tools/quality/scripts/check-resident-budget.sh --self-test
+      - bash packages/mosaic/framework/tools/quality/scripts/check-resident-budget.sh
+      # Test-membership guard (#1017): also first link of test:framework-shell.
+      # Invoked from BOTH surfaces it audits (F2, PR #1018) — the guard is link
+      # [0] of the pnpm chain, so severing that chain would silence it together
+      # with everything it guards; this direct line keeps one instrument running.
+      - bash packages/mosaic/framework/tools/quality/scripts/check-test-enumeration.sh
+
+  # Blocking gate (#791): a framework upgrade must never write or delete an
+  # operator-owned path. The HARD GATE proves an unanticipated operator sentinel
+  # survives a keep-mode reseed byte-identical (with rsync present AND absent —
+  # keep mode is a single cp-based path that must not depend on rsync), and that a
+  # corrupt/empty/missing manifest aborts fail-closed leaving operator files
+  # untouched (B2/B3). The rollback gate proves a mid-sync failure is rolled back
+  # from the pre-update snapshot (B1). The durable-snapshot gate (#791 PR2) proves
+  # the retained, operator-scoped pre-update backup is taken before any mutation
+  # (0700/0600, secret never logged, retention-pruned) and that the post-sync
+  # verify net restores any operator file a manifest bug lets the sync touch. The
+  # migration matrix pins the v2→v3 contract-file semantics. Pure bash, no
+  # node_modules — runs early alongside sanitization.
+  upgrade-guard:
+    image: *node_image
+    commands:
+      - apk add --no-cache bash rsync
+      - bash packages/mosaic/framework/tools/quality/scripts/test-upgrade-manifest-guard.sh
+      - bash packages/mosaic/framework/tools/quality/scripts/test-upgrade-rollback.sh
+      - bash packages/mosaic/framework/tools/quality/scripts/test-upgrade-durable-snapshot.sh
+      - bash packages/mosaic/framework/tools/quality/scripts/test-install-migration.sh
 
   typecheck:
     image: *node_image
@@ -25,6 +75,8 @@ steps:
       - pnpm typecheck
     depends_on:
       - install
+      - sanitization
+      - upgrade-guard
 
   # lint, format, and test are independent — run in parallel after typecheck
   lint:
@@ -46,18 +98,43 @@ steps:
   test:
     image: *node_image
     environment:
-      DATABASE_URL: postgresql://mosaic:mosaic@postgres:5432/mosaic
+      # Avoid the namespace-level Woodpecker DB service named "postgres".
+      # The Kubernetes backend exposes service containers by step name.
+      DATABASE_URL: postgresql://mosaic:mosaic@ci-postgres:5432/mosaic
     commands:
       - *enable_pnpm
-      # Install postgresql-client for pg_isready
-      - apk add --no-cache postgresql-client
-      # Wait up to 30s for postgres to be ready
+      # openssl (#912) is the wake HMAC signer: the digest H1/H2, beacon B12,
+      # and install I8 legs hard-require it in CI. It is baked into ci-base via
+      # Dockerfile.ci, but ci-base only rebuilds on push-to-main/tag — this
+      # `apk add` guarantees openssl is present on PR pipelines too (and is a
+      # fast no-op once the rebuilt image already ships it).
+      - apk add --no-cache openssl
+      # Pi runtime (Invariant R): invariant_r_unittest.py hard-requires an
+      # installed `pi` binary at exactly this measured version — the test
+      # boots Pi's real tool registry to prove the read-only carve-out
+      # resolves to real, unshadowed builtins, and fails loud (by design)
+      # when the runtime is absent or drifts. The canonical Pi is
+      # @earendil-works/[email protected] exactly (@mariozechner/* is
+      # embedded-legacy). Step-level install because ci-base image publishes
+      # are currently blocked on registry auth; fold into Dockerfile.ci once
+      # that is fixed, keeping this as a fast no-op guard.
+      - npm install -g @earendil-works/[email protected]
+      # postgresql-client (pg_isready) is baked into ci-base.
+      # Wait up to 60s for CI postgres to be ready; fail fast if it never comes up.
       - |
-        for i in $(seq 1 30); do
-          pg_isready -h postgres -p 5432 -U mosaic && break
-          echo "Waiting for postgres ($i/30)..."
+        ready=0
+        for i in $(seq 1 60); do
+          if pg_isready -h ci-postgres -p 5432 -U mosaic; then
+            ready=1
+            break
+          fi
+          echo "Waiting for ci-postgres ($i/60)..."
           sleep 1
         done
+        if [ "$ready" -ne 1 ]; then
+          echo "ci-postgres did not become ready" >&2
+          exit 1
+        fi
       # Run migrations (DATABASE_URL is set in environment above)
       - pnpm --filter @mosaicstack/db run db:migrate
       # Run all tests
@@ -66,7 +143,7 @@ steps:
       - typecheck
 
 services:
-  postgres:
+  ci-postgres:
     image: pgvector/pgvector:pg17
     environment:
       POSTGRES_USER: mosaic

.woodpecker/publish.yml

@@ -1,12 +1,43 @@
 # Build, publish npm packages, and push Docker images
-# Runs only on main branch push/tag
+# Runs on main for stable publishes and on next for integration-line prereleases/images
 
 variables:
-  - &node_image 'node:22-alpine'
+  # Pre-baked CI base (see .woodpecker/ci-image.yml): node:24-alpine +
+  # toolchain + warm pnpm store. Kills the second cold install publish pays.
+  - &node_image 'git.mosaicstack.dev/mosaicstack/stack/ci-base:latest'
   - &enable_pnpm 'corepack enable'
+  # Heavy kaniko image builds (~25 min) — gate them so a merge that only touches
+  # the npm-only CLI (@mosaicstack/mosaic) or docs does NOT rebuild the platform
+  # images (gateway/appservice/web do not depend on @mosaicstack/mosaic). Releases
+  # (tags) always build everything. Exclude-list keeps the default SAFE: any
+  # non-excluded change still builds, so no transitive dep can silently go stale.
+  # (Woodpecker: `when` entries are OR'd; `path` applies to push/PR only — hence
+  # the separate `event: tag` entry.)
+  - &image_build_when
+    - event: tag
+    - event: [push, manual]
+      branch: main
+      path:
+        exclude:
+          - 'packages/mosaic/**'
+          - 'docs/**'
+          - '**/*.md'
+          - '.woodpecker/**'
+    - event: [push, manual]
+      branch: next
+  - &main_image_build_when
+    - event: tag
+    - event: [push, manual]
+      branch: main
+      path:
+        exclude:
+          - 'packages/mosaic/**'
+          - 'docs/**'
+          - '**/*.md'
+          - '.woodpecker/**'
 
 when:
-  - branch: [main]
+  - branch: [main, next]
     event: [push, manual, tag]
 
 steps:
@@ -14,7 +45,8 @@ steps:
     image: *node_image
     commands:
       - corepack enable
-      - pnpm install --frozen-lockfile
+      # Resolve from the baked pnpm store instead of a cold network fetch.
+      - pnpm install --frozen-lockfile --prefer-offline
 
   build:
     image: *node_image
@@ -26,6 +58,15 @@ steps:
 
   publish-npm:
     image: *node_image
+    # Publish only when a publishable package changed (or on a release tag); a
+    # pure-docs merge runs no publish. Cheap step, but gated for cleanliness.
+    when:
+      - event: tag
+      - event: [push, manual]
+        branch: main
+        path:
+          include:
+            - 'packages/**'
     environment:
       NPM_TOKEN:
         from_secret: gitea_token
@@ -74,6 +115,84 @@ steps:
     depends_on:
       - build
 
+  publish-next-npm:
+    image: *node_image
+    # Durable @next integration-line publish. Runs only on next; never writes
+    # the latest dist-tag and never commits the computed prerelease versions.
+    when:
+      - event: [push, manual]
+        branch: next
+    environment:
+      NPM_TOKEN:
+        from_secret: gitea_token
+      CI_COMMIT_BRANCH: ${CI_COMMIT_BRANCH}
+      CI_PIPELINE_NUMBER: ${CI_PIPELINE_NUMBER}
+    commands:
+      - *enable_pnpm
+      - |
+        if [ "$CI_COMMIT_BRANCH" != "next" ]; then
+          echo "[publish-next] FATAL: publish-next-npm may only run on next (got '$CI_COMMIT_BRANCH')" >&2
+          exit 1
+        fi
+        if [ -z "$CI_PIPELINE_NUMBER" ]; then
+          echo "[publish-next] FATAL: CI_PIPELINE_NUMBER is required for prerelease versioning" >&2
+          exit 1
+        fi
+        echo "//git.mosaicstack.dev/api/packages/mosaicstack/npm/:_authToken=$NPM_TOKEN" > ~/.npmrc
+        echo "@mosaicstack:registry=https://git.mosaicstack.dev/api/packages/mosaicstack/npm/" >> ~/.npmrc
+        DIST_TAGS_JSON="$(npm view @mosaicstack/mosaic dist-tags --registry https://git.mosaicstack.dev/api/packages/mosaicstack/npm/ --json)"
+        DIST_TAGS_JSON="$DIST_TAGS_JSON" node -e 'const tags = JSON.parse(process.env.DIST_TAGS_JSON || "{}"); if (!tags || typeof tags !== "object" || !Object.hasOwn(tags, "latest")) { throw new Error("Gitea npm registry did not return a usable dist-tags object"); } console.log("[publish-next] registry dist-tags OK: latest=" + tags.latest);'
+        node <<'NODE'
+        const fs = require('node:fs');
+        const path = require('node:path');
+
+        const pipelineNumber = process.env.CI_PIPELINE_NUMBER;
+        const roots = ['apps', 'packages', 'plugins'];
+        const updated = [];
+
+        function walk(dir) {
+          if (!fs.existsSync(dir)) return;
+          for (const entry of fs.readdirSync(dir, { withFileTypes: true })) {
+            if (entry.name === 'node_modules' || entry.name === 'dist' || entry.name === '.turbo') continue;
+            const fullPath = path.join(dir, entry.name);
+            if (entry.isDirectory()) {
+              const packagePath = path.join(fullPath, 'package.json');
+              if (fs.existsSync(packagePath)) updatePackage(packagePath);
+              walk(fullPath);
+            }
+          }
+        }
+
+        function updatePackage(packagePath) {
+          const manifest = JSON.parse(fs.readFileSync(packagePath, 'utf8'));
+          if (!manifest.name?.startsWith('@mosaicstack/') || manifest.private) return;
+          const stableMatch = /^(\d+)\.(\d+)\.(\d+)(?:[-+].*)?$/.exec(manifest.version);
+          if (!stableMatch) {
+            throw new Error(manifest.name + " has unsupported semver version '" + manifest.version + "'");
+          }
+          const [, major, minor, patch] = stableMatch;
+          const oldVersion = manifest.version;
+          manifest.version = major + '.' + minor + '.' + (Number(patch) + 1) + '-next.' + pipelineNumber;
+          fs.writeFileSync(packagePath, JSON.stringify(manifest, null, 2) + '\n');
+          updated.push(manifest.name + ' ' + oldVersion + ' -> ' + manifest.version);
+        }
+
+        for (const root of roots) walk(root);
+        if (updated.length === 0) throw new Error('No publishable @mosaicstack/* packages found');
+        console.log('[publish-next] computed prerelease versions for ' + updated.length + ' packages:');
+        for (const line of updated) console.log('[publish-next] ' + line);
+        NODE
+        pnpm --filter "@mosaicstack/*" --filter "!@mosaicstack/web" --filter "!@mosaicstack/mosaic-as" publish --no-git-checks --access public --tag next
+        EXPECTED_VERSION="$(node -p "require('./packages/mosaic/package.json').version")"
+        RESOLVED_VERSION="$(npm view @mosaicstack/mosaic@next version --registry https://git.mosaicstack.dev/api/packages/mosaicstack/npm/)"
+        if [ "$RESOLVED_VERSION" != "$EXPECTED_VERSION" ]; then
+          echo "[publish-next] FATAL: @mosaicstack/mosaic@next resolved '$RESOLVED_VERSION', expected '$EXPECTED_VERSION'" >&2
+          exit 1
+        fi
+        echo "[publish-next] @mosaicstack/mosaic@next resolves to $RESOLVED_VERSION"
+    depends_on:
+      - build
+
   # TODO: Uncomment when ready to publish to npmjs.org
   # publish-npmjs:
   #   image: *node_image
@@ -91,6 +210,7 @@ steps:
 
   build-gateway:
     image: gcr.io/kaniko-project/executor:debug
+    when: *image_build_when
     environment:
       REGISTRY_USER:
         from_secret: gitea_username
@@ -103,19 +223,29 @@ steps:
       - mkdir -p /kaniko/.docker
       - echo "{\"auths\":{\"git.mosaicstack.dev\":{\"username\":\"$REGISTRY_USER\",\"password\":\"$REGISTRY_PASS\"}}}" > /kaniko/.docker/config.json
       - |
-        DESTINATIONS="--destination git.mosaicstack.dev/mosaicstack/mosaic-stack/gateway:sha-${CI_COMMIT_SHA:0:7}"
-        if [ "$CI_COMMIT_BRANCH" = "main" ]; then
-          DESTINATIONS="$DESTINATIONS --destination git.mosaicstack.dev/mosaicstack/mosaic-stack/gateway:latest"
+        DESTINATIONS="--destination git.mosaicstack.dev/mosaicstack/stack/gateway:sha-${CI_COMMIT_SHA:0:7}"
+        if [ "$CI_COMMIT_BRANCH" = "next" ]; then
+          if [ -n "$CI_COMMIT_TAG" ]; then
+            echo "[publish] FATAL: next gateway publish must be sha-only; refusing tag '$CI_COMMIT_TAG'" >&2
+            exit 1
+          fi
+          echo "[publish] next gateway publish is sha-only"
+        elif [ "$CI_COMMIT_BRANCH" = "main" ]; then
+          DESTINATIONS="$DESTINATIONS --destination git.mosaicstack.dev/mosaicstack/stack/gateway:latest"
+        elif [ -z "$CI_COMMIT_TAG" ]; then
+          echo "[publish] FATAL: gateway image publish may only run for main, next, or tag events" >&2
+          exit 1
         fi
         if [ -n "$CI_COMMIT_TAG" ]; then
-          DESTINATIONS="$DESTINATIONS --destination git.mosaicstack.dev/mosaicstack/mosaic-stack/gateway:$CI_COMMIT_TAG"
+          DESTINATIONS="$DESTINATIONS --destination git.mosaicstack.dev/mosaicstack/stack/gateway:$CI_COMMIT_TAG"
         fi
         /kaniko/executor --context . --dockerfile docker/gateway.Dockerfile $DESTINATIONS
     depends_on:
       - build
 
-  build-web:
+  build-appservice:
     image: gcr.io/kaniko-project/executor:debug
+    when: *main_image_build_when
     environment:
       REGISTRY_USER:
         from_secret: gitea_username
@@ -128,12 +258,38 @@ steps:
       - mkdir -p /kaniko/.docker
       - echo "{\"auths\":{\"git.mosaicstack.dev\":{\"username\":\"$REGISTRY_USER\",\"password\":\"$REGISTRY_PASS\"}}}" > /kaniko/.docker/config.json
       - |
-        DESTINATIONS="--destination git.mosaicstack.dev/mosaicstack/mosaic-stack/web:sha-${CI_COMMIT_SHA:0:7}"
+        DESTINATIONS="--destination git.mosaicstack.dev/mosaicstack/stack/appservice:sha-${CI_COMMIT_SHA:0:7}"
         if [ "$CI_COMMIT_BRANCH" = "main" ]; then
-          DESTINATIONS="$DESTINATIONS --destination git.mosaicstack.dev/mosaicstack/mosaic-stack/web:latest"
+          DESTINATIONS="$DESTINATIONS --destination git.mosaicstack.dev/mosaicstack/stack/appservice:latest"
         fi
         if [ -n "$CI_COMMIT_TAG" ]; then
-          DESTINATIONS="$DESTINATIONS --destination git.mosaicstack.dev/mosaicstack/mosaic-stack/web:$CI_COMMIT_TAG"
+          DESTINATIONS="$DESTINATIONS --destination git.mosaicstack.dev/mosaicstack/stack/appservice:$CI_COMMIT_TAG"
+        fi
+        /kaniko/executor --context . --dockerfile docker/appservice.Dockerfile $DESTINATIONS
+    depends_on:
+      - build
+
+  build-web:
+    image: gcr.io/kaniko-project/executor:debug
+    when: *main_image_build_when
+    environment:
+      REGISTRY_USER:
+        from_secret: gitea_username
+      REGISTRY_PASS:
+        from_secret: gitea_password
+      CI_COMMIT_BRANCH: ${CI_COMMIT_BRANCH}
+      CI_COMMIT_TAG: ${CI_COMMIT_TAG}
+      CI_COMMIT_SHA: ${CI_COMMIT_SHA}
+    commands:
+      - mkdir -p /kaniko/.docker
+      - echo "{\"auths\":{\"git.mosaicstack.dev\":{\"username\":\"$REGISTRY_USER\",\"password\":\"$REGISTRY_PASS\"}}}" > /kaniko/.docker/config.json
+      - |
+        DESTINATIONS="--destination git.mosaicstack.dev/mosaicstack/stack/web:sha-${CI_COMMIT_SHA:0:7}"
+        if [ "$CI_COMMIT_BRANCH" = "main" ]; then
+          DESTINATIONS="$DESTINATIONS --destination git.mosaicstack.dev/mosaicstack/stack/web:latest"
+        fi
+        if [ -n "$CI_COMMIT_TAG" ]; then
+          DESTINATIONS="$DESTINATIONS --destination git.mosaicstack.dev/mosaicstack/stack/web:$CI_COMMIT_TAG"
         fi
         /kaniko/executor --context . --dockerfile docker/web.Dockerfile $DESTINATIONS
     depends_on:

AGENTS.md

@@ -11,61 +11,100 @@
 
 ## Project Context
 
-Mosaic Stack is a self-hosted, multi-user AI agent platform. TypeScript monorepo with NestJS gateway, Next.js web dashboard, Pi SDK agent runtime, and plugin architecture for Discord/Telegram.
+Mosaic Stack is a self-hosted, multi-user AI agent platform. It is a TypeScript monorepo with a NestJS gateway, Next.js dashboard, Pi SDK agent runtime, and Discord/Telegram plugin architecture.
 
-## Package Map
+### Stack
 
-| Package            | Purpose                         | Key Dependencies                 |
-| ------------------ | ------------------------------- | -------------------------------- |
-| `apps/gateway`     | NestJS API + WebSocket hub      | Fastify, Socket.IO, Pi SDK, OTEL |
-| `apps/web`         | Next.js dashboard               | React 19, Tailwind               |
-| `packages/types`   | Shared TypeScript contracts     | class-validator                  |
-| `packages/db`      | Drizzle ORM schema + migrations | drizzle-orm, postgres            |
-| `packages/auth`    | BetterAuth configuration        | better-auth, @mosaicstack/db     |
-| `packages/brain`   | Data layer (PG-backed)          | @mosaicstack/db                  |
-| `packages/queue`   | Valkey task queue + MCP         | ioredis                          |
-| `packages/coord`   | Mission coordination            | @mosaicstack/queue               |
-| `packages/mosaic`  | Unified `mosaic` CLI + TUI      | Ink, Pi SDK, commander           |
-| `plugins/discord`  | Discord channel plugin          | discord.js                       |
-| `plugins/telegram` | Telegram channel plugin         | Telegraf                         |
+- **API:** NestJS with Fastify (`apps/gateway`)
+- **Web:** Next.js 16 with React 19 (`apps/web`)
+- **ORM and database:** Drizzle ORM, PostgreSQL 17, and pgvector (`packages/db`)
+- **Authentication:** BetterAuth (`packages/auth`)
+- **Agent runtime:** Pi SDK (`apps/gateway`, `packages/mosaic`)
+- **Queue:** Valkey 8 (`packages/queue`)
+- **Build:** pnpm workspaces and Turborepo
+- **CI:** Woodpecker CI
+- **Observability:** OpenTelemetry and Jaeger
 
-## Architecture Rules
+### Package Map
 
-1. Gateway is the single API surface — all clients connect through it
-2. Pi SDK is ESM-only — gateway and CLI must use ESM
-3. Socket.IO typed events defined in `@mosaicstack/types` enforce compile-time contracts
-4. OTEL auto-instrumentation loads before NestJS bootstrap
-5. BetterAuth manages auth tables; schema defined in `@mosaicstack/db`
-6. Docker Compose provides PG (5433), Valkey (6380), OTEL Collector (4317/4318), Jaeger (16686)
-7. Explicit `@Inject()` decorators required in NestJS (tsx/esbuild doesn't emit decorator metadata)
+| Package            | Purpose                       | Key Dependencies                 |
+| ------------------ | ----------------------------- | -------------------------------- |
+| `apps/gateway`     | NestJS API + WebSocket hub    | Fastify, Socket.IO, Pi SDK, OTEL |
+| `apps/web`         | Next.js dashboard             | React 19, Tailwind               |
+| `packages/types`   | Shared TypeScript contracts   | class-validator                  |
+| `packages/db`      | Drizzle schema and migrations | drizzle-orm, postgres            |
+| `packages/auth`    | BetterAuth configuration      | better-auth, @mosaicstack/db     |
+| `packages/brain`   | Structured data layer         | @mosaicstack/db                  |
+| `packages/queue`   | Valkey task queue and MCP     | ioredis                          |
+| `packages/coord`   | Mission coordination          | @mosaicstack/queue               |
+| `packages/mosaic`  | Unified `mosaic` CLI and TUI  | Ink, Pi SDK, commander           |
+| `plugins/discord`  | Discord channel plugin        | discord.js                       |
+| `plugins/telegram` | Telegram channel plugin       | Telegraf                         |
+
+## Architecture and Code Conventions
+
+1. Gateway is the single API surface; all clients connect through it.
+2. Pi SDK is ESM-only; gateway and CLI code must remain ESM.
+3. Use `"type": "module"`, NodeNext module resolution, and `.js` extensions in imports.
+4. Keep typed Socket.IO events in `@mosaicstack/types` to enforce client/server contracts.
+5. Import OTEL tracing before NestJS bootstrap (`import './tracing.js'`).
+6. Use explicit `@Inject()` decorators in NestJS because tsx/esbuild does not emit decorator metadata.
+7. Keep DTOs in `*.dto.ts` files at module boundaries.
+8. BetterAuth owns authentication tables; their schema is defined in `@mosaicstack/db`.
+9. Create a task-specific scratchpad for non-trivial work.
 
 ## Development Workflow
 
+Requirements: Node.js 20+, pnpm 10.6.2, and Docker Compose when optional local services are needed.
+
 ```bash
-docker compose up -d          # Infrastructure
-pnpm install                  # Dependencies
-pnpm typecheck && pnpm lint && pnpm format:check  # Quality gates
+pnpm install --frozen-lockfile
+pnpm preflight
+
+# Optional local queue service only; do not start the full Compose stack.
+docker compose up -d valkey
 ```
 
-## Repo-Specific Notes
+The pre-push hook requires:
 
-- DTOs in `*.dto.ts` files at module boundaries
-- ESM everywhere (`"type": "module"`, `.js` extensions in imports)
-- NodeNext module resolution in all tsconfigs
-- Scratchpads are mandatory for non-trivial tasks
+```bash
+pnpm preflight && pnpm typecheck && pnpm lint && pnpm format:check
+```
+
+Software delivery also requires the applicable tests. Common repository commands are:
+
+```bash
+pnpm typecheck     # TypeScript checks across the workspace
+pnpm lint          # ESLint across the workspace
+pnpm test          # Checkout tests and package Vitest suites
+pnpm format:check  # Prettier check
+pnpm build         # Build all packages and applications
+```
+
+## Database and Local Runtime Safety
+
+- Current local data-layer work uses in-process PGlite; leave `DATABASE_URL` unset.
+- PostgreSQL execution is held until KBN-101-00, KBN-101-03, and KBN-101-05 land.
+- Do not invoke a migration runner, initialization SQL, or the Compose PostgreSQL service from this checkout.
+- Do not start Gateway/Web or run root `pnpm dev` as a local PGlite route. The current dotenv loader can inherit a daemon PostgreSQL DSN; KBN-101-02 must make that path fail closed first.
+- Migration artifact generation is offline and does not authorize PostgreSQL access:
+
+```bash
+pnpm --filter @mosaicstack/db db:generate
+```
 
 ## docs/TASKS.md — Schema (CANONICAL)
 
 The `agent` column specifies the required model for each task. **This is set at task creation by the orchestrator and must not be changed by workers.**
 
-| Value    | When to use                                                 | Budget                     |
-| -------- | ----------------------------------------------------------- | -------------------------- |
-| `codex`  | All coding tasks (default for implementation)               | OpenAI credits — preferred |
-| `glm-5`  | Cost-sensitive coding where Codex is unavailable            | Z.ai credits               |
-| `haiku`  | Review gates, verify tasks, status checks, docs-only        | Cheapest Claude tier       |
-| `sonnet` | Complex planning, multi-file reasoning, architecture review | Claude quota               |
-| `opus`   | Major cross-cutting architecture decisions ONLY             | Most expensive — minimize  |
-| `—`      | No preference / auto-select cheapest capable                | Pipeline decides           |
+| Value     | When to use                                                 | Budget                     |
+| --------- | ----------------------------------------------------------- | -------------------------- |
+| `codex`   | All coding tasks (default for implementation)               | OpenAI credits — preferred |
+| `glm-5.1` | Cost-sensitive coding where Codex is unavailable            | Z.ai credits               |
+| `haiku`   | Review gates, verify tasks, status checks, docs-only        | Cheapest Claude tier       |
+| `sonnet`  | Complex planning, multi-file reasoning, architecture review | Claude quota               |
+| `opus`    | Major cross-cutting architecture decisions ONLY             | Most expensive — minimize  |
+| `—`       | No preference / auto-select cheapest capable                | Pipeline decides           |
 
 Pipeline crons read this column and spawn accordingly. Workers never modify `docs/TASKS.md` — only the orchestrator writes it.
 

CLAUDE.md

@@ -1,45 +1,5 @@
-# CLAUDE.md — Mosaic Stack
+# Claude Compatibility Pointer
 
-## Project
+@AGENTS.md
 
-Self-hosted, multi-user AI agent platform. TypeScript monorepo.
-
-## Stack
-
-- **API**: NestJS + Fastify adapter (`apps/gateway`)
-- **Web**: Next.js 16 + React 19 (`apps/web`)
-- **ORM**: Drizzle ORM + PostgreSQL 17 + pgvector (`packages/db`)
-- **Auth**: BetterAuth (`packages/auth`)
-- **Agent**: Pi SDK (`packages/agent`, `packages/mosaic`)
-- **Queue**: Valkey 8 (`packages/queue`)
-- **Build**: pnpm workspaces + Turborepo
-- **CI**: Woodpecker CI
-- **Observability**: OpenTelemetry → Jaeger
-
-## Commands
-
-```bash
-pnpm typecheck        # TypeScript check (all packages)
-pnpm lint             # ESLint (all packages)
-pnpm format:check     # Prettier check
-pnpm test             # Vitest (all packages)
-pnpm build            # Build all packages
-
-# Database
-pnpm --filter @mosaicstack/db db:push      # Push schema to PG (dev)
-pnpm --filter @mosaicstack/db db:generate  # Generate migrations
-pnpm --filter @mosaicstack/db db:migrate   # Run migrations
-
-# Dev
-docker compose up -d                  # Start PG, Valkey, OTEL, Jaeger
-pnpm --filter @mosaicstack/gateway exec tsx src/main.ts  # Start gateway
-```
-
-## Conventions
-
-- ESM everywhere (`"type": "module"`, `.js` extensions in imports)
-- NodeNext module resolution
-- Explicit `@Inject()` decorators in NestJS (tsx/esbuild doesn't support emitDecoratorMetadata)
-- DTOs in `*.dto.ts` files at module boundaries
-- OTEL tracing imported before NestJS bootstrap (`import './tracing.js'`)
-- All three gates must pass before push: typecheck, lint, format:check
+Do not add project guidance here. Keep `AGENTS.md` authoritative so every agent runtime receives the same instructions.

Dockerfile.ci

@@ -0,0 +1,48 @@
+# Pre-baked CI base image for Woodpecker pipelines.
+#
+# Purpose: eliminate the cold `pnpm install` that dominates every pipeline
+# (~731s median). This image ships the native toolchain (no per-run `apk add`)
+# AND a warm, content-addressable pnpm store with the dependency-tree tarballs
+# already fetched at build time. `pnpm fetch` only populates the store from the
+# lockfile — it does NOT run the native node-gyp builds (better-sqlite3,
+# node-pty, sqlite3, canvas, sharp); those still compile at `pnpm install`,
+# which is exactly why the musl toolchain stays baked into this image. A
+# pipeline `pnpm install --frozen-lockfile --prefer-offline` then resolves
+# tarballs from local hard-links (no network) and compiles natives against the
+# already-present toolchain, in tens of seconds instead of ~731s.
+#
+# Rebuilt only when `pnpm-lock.yaml` or this Dockerfile change
+# (see .woodpecker/ci-image.yml).
+#
+# Node version is pinned to 24 (Active LTS). This is the follow-up bump from
+# node:22 — sequenced AFTER the CI cache work landed so the runtime change
+# carries zero cache variables. node:26 stays held until it reaches LTS
+# (Oct 2026); the Current line risks native-module (node-gyp) breakage on a
+# runner that compiles better-sqlite3 / canvas / sharp / node-pty from source.
+FROM node:24-alpine
+
+# Native toolchain required to compile node-gyp deps on musl, plus the
+# postgresql-client used by the test step's pg_isready readiness probe. `bash`,
+# `git`, and `jq` are baked here too — framework shell tests and the shipped
+# Codex review wrappers require them without per-run installation in ci.yml.
+# `openssl` (#912) is the non-circular HMAC signer for the wake trust layer:
+# the digest H1/H2, beacon B12, and install I8 legs hard-require it in CI so the
+# §4 G6 evidence comes from an actually-run HMAC leg, not a skipped one.
+RUN apk add --no-cache python3 make g++ postgresql-client bash git jq openssl
+
+# Pin pnpm to the repo's packageManager version via corepack.
+RUN corepack enable && corepack prepare [email protected] --activate
+
+WORKDIR /app
+
+# Pin the store location so the pipeline can point `store-dir` at the same path.
+ENV PNPM_HOME=/root/.local/share/pnpm
+RUN pnpm config set store-dir /root/.local/share/pnpm/store
+
+# Warm the store. `pnpm fetch` populates the content-addressable store with the
+# dependency tarballs directly from the lockfile (no package.json / workspace
+# needed), so a baked store stays valid until the lockfile changes. Note:
+# `fetch` does NOT compile native modules — that happens later at `pnpm install`
+# in the pipeline, against the toolchain baked above.
+COPY pnpm-lock.yaml ./
+RUN pnpm fetch --frozen-lockfile

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 Mosaic Stack
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -7,7 +7,13 @@ Mosaic gives you a unified launcher for Claude Code, Codex, OpenCode, and Pi —
 ## Quick Install
 
 ```bash
-bash <(curl -fsSL https://git.mosaicstack.dev/mosaicstack/mosaic-stack/raw/branch/main/tools/install.sh)
+curl -fsSL https://mosaicstack.dev/install.sh | bash
+```
+
+Or use the direct URL:
+
+```bash
+bash <(curl -fsSL https://git.mosaicstack.dev/mosaicstack/stack/raw/branch/main/tools/install.sh)
 ```
 
 The installer auto-launches the setup wizard, which walks you through gateway install and verification. Flags for non-interactive use:
@@ -24,6 +30,16 @@ This installs both components:
 | **Framework**           | Bash launcher, guides, runtime configs, tools, skills            | `~/.config/mosaic/`  |
 | **@mosaicstack/mosaic** | Unified `mosaic` CLI — TUI, gateway client, wizard, auto-updater | `~/.npm-global/bin/` |
 
+### Install lanes
+
+| Lane                     | Command                               | Use when                                              | Source                                                                  |
+| ------------------------ | ------------------------------------- | ----------------------------------------------------- | ----------------------------------------------------------------------- |
+| Stable                   | `bash tools/install.sh`               | You want the released Mosaic CLI/framework            | npm registry `@mosaicstack/mosaic@latest` + framework archive at `main` |
+| Prerelease integration   | `bash tools/install.sh --next`        | You want the current `next` integration branch        | Build-from-source at `next`                                             |
+| Contributor/source build | `bash tools/install.sh --dev --ref X` | You are testing a branch before release; `--ref` wins | Build-from-source at the requested ref                                  |
+
+`--next` is shorthand for the prerelease integration lane: it enables source-build mode and uses `next` unless an explicit `--ref` or `MOSAIC_REF` is provided.
+
 After install, the wizard runs automatically or you can invoke it manually:
 
 ```bash
@@ -32,9 +48,13 @@ mosaic wizard        # Full guided setup (gateway install → verify)
 
 ### Requirements
 
-- Node.js ≥ 20
+- Node.js ≥ 22
 - npm (for global @mosaicstack/mosaic install)
-- One or more runtimes: [Claude Code](https://docs.anthropic.com/en/docs/claude-code), [Codex](https://github.com/openai/codex), [OpenCode](https://opencode.ai), or [Pi](https://github.com/mariozechner/pi-coding-agent)
+- One or more runtimes:
+  - [Claude Code](https://docs.anthropic.com/en/docs/claude-code)
+  - [Codex](https://github.com/openai/codex)
+  - [OpenCode](https://opencode.ai)
+  - [Pi](https://pi.dev)
 
 ## Usage
 
@@ -52,6 +72,8 @@ mosaic yolo pi               # Pi in yolo mode
 
 The launcher verifies your config, checks for `SOUL.md`, injects your `AGENTS.md` standards into the runtime, and forwards all arguments.
 
+Pi launches default to a token-lean skill posture: `mosaic pi` passes `--no-skills` so Pi does not preload every global skill description into the system prompt. Use `MOSAIC_PI_SKILL_MODE=all mosaic pi` for the legacy all-skills catalog, or `MOSAIC_PI_SKILL_MODE=discover mosaic pi` to let Pi use its native settings/project skill discovery.
+
 ### TUI & Gateway
 
 ```bash
@@ -74,6 +96,8 @@ If you already have a gateway account but no token, use `mosaic gateway config r
 
 ### Configuration
 
+Mosaic supports three storage tiers: `local` (PGlite, single-host), `standalone` (PostgreSQL, single-host), and `federated` (PostgreSQL + pgvector + Valkey, multi-host). See [Federated Tier Setup](docs/federation/SETUP.md) for multi-user and production deployments, or [Migrating to Federated](docs/guides/migrate-tier.md) to upgrade from existing tiers.
+
 ```bash
 mosaic config show           # Print full config as JSON
 mosaic config get <key>      # Read a specific key
@@ -87,7 +111,10 @@ mosaic config path           # Print config file path
 ```bash
 mosaic doctor                # Health audit — detect drift and missing files
 mosaic sync                  # Sync skills from canonical source
-mosaic update                # Check for and install CLI updates
+mosaic skill list            # Audit Claude skill registrations and conflicts
+mosaic skill register <name> # Register one canonical skill with Claude Code
+mosaic skill unregister <name> # Remove one Mosaic-owned Claude link
+mosaic update                # Update CLI/framework and auto-register canonical skills
 mosaic wizard                # Full guided setup wizard
 mosaic bootstrap <path>      # Bootstrap a repo with Mosaic standards
 mosaic coord init            # Initialize a new orchestration mission
@@ -147,7 +174,12 @@ mosaic storage status
 mosaic storage tier
 mosaic storage export
 mosaic storage import
-mosaic storage migrate
+# Schema migration is unavailable in this release. The current storage wrapper shells
+# directly to `pnpm --filter @mosaicstack/db db:migrate`; it is legacy N-1,
+# uncertified, and MUST NOT be invoked pending KBN-101-02/-03/-06/-08 activation.
+# Future schema migration is non-operative: external bootstrap → TLS/roles → runner
+# --run → runner --verify → readiness. Tier copy uses only the separately held secure
+# migrate-tier route.
 ```
 
 ### Telemetry
@@ -172,43 +204,60 @@ Consent state is persisted in config. Remote upload is a no-op until you run `mo
 
 ### Prerequisites
 
-- Node.js ≥ 20
+- Node.js ≥ 22
 - pnpm 10.6+
 - Docker & Docker Compose
 
 ### Setup
 
 ```bash
-git clone [email protected]:mosaicstack/mosaic-stack.git
-cd mosaic-stack
+git clone [email protected]:mosaicstack/stack.git
+cd stack
 
-# Start infrastructure (Postgres, Valkey, Jaeger)
-docker compose up -d
-
-# Install dependencies
+# Install dependencies. The local tier uses in-process PGlite; leave DATABASE_URL unset.
+# The pnpm store defaults to $HOME/.local/share/pnpm/store. Override it without
+# editing the checkout with NPM_CONFIG_STORE_DIR=$HOME/another-store if needed.
 pnpm install
 
-# Run migrations
-pnpm --filter @mosaicstack/db run db:migrate
+# Verify dependencies and generated state before running source-quality gates.
+# Missing dependencies exit 42; stale/foreign apps/web/.next state exits 43.
+# The web build certifies its exact standalone symlink manifest; added, removed,
+# retargeted, or manifest-only-tampered generated links also exit 43. This detects
+# accidental, independent, stale, and foreign-residue mutation—the class exposed by
+# a five-month-stale .next that produced 19 phantom TS2307 errors.
+# It does NOT defend against a same-UID actor that can rewrite both manifest and
+# marker consistently (CWE-345). RM-59 tracks the required executor/spine-side
+# trust anchor outside worktree authority.
+pnpm preflight
 
-# Start all services in dev mode
-pnpm dev
+# Optional local queue service only. This does not start PostgreSQL.
+docker compose up -d valkey
+
+# The current Gateway/Web local process is held; see docs/guides/dev-guide.md.
+# Do not start it until KBN-101-02 makes inherited dotenv/DSN state fail closed.
 ```
 
-### Infrastructure
+### Held future procedure
 
-Docker Compose provides:
+The checked-in Compose PostgreSQL service mounts legacy initialization SQL and is **not** a
+current PostgreSQL, standalone, or federated developer route. Do not start it with Compose,
+invoke initialization SQL, or treat the planned migrator as currently executable.
 
-| Service               | Port      | Purpose                |
-| --------------------- | --------- | ---------------------- |
-| PostgreSQL (pgvector) | 5433      | Primary database       |
-| Valkey                | 6380      | Task queue + caching   |
-| Jaeger                | 16686     | Distributed tracing UI |
-| OTEL Collector        | 4317/4318 | Telemetry ingestion    |
+**Held future activation procedure — non-operative and no current command authority until KBN-101-00, KBN-101-03, and KBN-101-05
+land:** external bootstrap → TLS/roles → `mosaic-db-migrator --run` →
+`mosaic-db-migrator --verify` → Gateway/Compose readiness. The future deployment artifacts—not
+this README—will provide the reviewed commands and secret-consumer interface.
+
+For local data-layer work, PGlite needs no PostgreSQL service. The optional Compose command above
+starts only Valkey; OTEL Collector and Jaeger may likewise be started individually if needed,
+without starting PostgreSQL. A Gateway/Web local process is not currently a safe PGlite route:
+its unguarded dotenv loader may inherit a daemon PostgreSQL DSN. Do not use root `pnpm dev` or a
+Gateway start command until KBN-101-02 makes that state fail closed.
 
 ### Quality Gates
 
 ```bash
+pnpm preflight               # Checkout/dependency/generated-state validation
 pnpm typecheck               # TypeScript type checking (all packages)
 pnpm lint                    # ESLint (all packages)
 pnpm test                    # Vitest (all packages)
@@ -221,7 +270,7 @@ pnpm format                  # Prettier auto-fix
 Woodpecker CI runs on every push:
 
 - `pnpm install --frozen-lockfile`
-- Database migration against a fresh Postgres
+- **Legacy N-1 CI status only — active, uncertified, and non-authorizing as an operator route:** the checked-in job currently invokes `pnpm --filter @mosaicstack/db run db:migrate` with `DATABASE_URL` against an isolated disposable PostgreSQL CI database. It performs direct DDL in that CI database, is not approved ordinary behavior or an operator route, and remains a known exception pending KBN-101-06 removal/replacement by the certified runner-backed CI path.
 - `pnpm test` (Turbo-orchestrated across all packages)
 
 npm packages are published to the Gitea package registry on main merges.
@@ -229,7 +278,7 @@ npm packages are published to the Gitea package registry on main merges.
 ## Architecture
 
 ```
-mosaic-stack/
+stack/
 ├── apps/
 │   ├── gateway/             NestJS API + WebSocket hub (Fastify, Socket.IO, OTEL)
 │   └── web/                 Next.js dashboard (React 19, Tailwind)
@@ -302,7 +351,13 @@ Each stage has a dispatch mode (`exec` for research/review, `yolo` for coding),
 Run the installer again — it handles upgrades automatically:
 
 ```bash
-bash <(curl -fsSL https://git.mosaicstack.dev/mosaicstack/mosaic-stack/raw/branch/main/tools/install.sh)
+curl -fsSL https://mosaicstack.dev/install.sh | bash
+```
+
+Or use the direct URL:
+
+```bash
+bash <(curl -fsSL https://git.mosaicstack.dev/mosaicstack/stack/raw/branch/main/tools/install.sh)
 ```
 
 Or use the CLI:
@@ -320,11 +375,15 @@ The CLI also performs a background update check on every invocation (cached for
 bash tools/install.sh --check           # Version check only
 bash tools/install.sh --framework       # Framework only (skip npm CLI)
 bash tools/install.sh --cli             # npm CLI only (skip framework)
-bash tools/install.sh --ref v1.0        # Install from a specific git ref
+bash tools/install.sh --next            # Prerelease lane: source build from next
+bash tools/install.sh --dev             # Contributor lane: source build at --ref/main
+bash tools/install.sh --ref v1.0        # Install from a specific git ref (--ref wins over --next)
 bash tools/install.sh --yes             # Non-interactive, accept all defaults
 bash tools/install.sh --no-auto-launch  # Skip auto-launch of wizard
 ```
 
+The installer rejects unrecognized flags or positional arguments before making changes and prints the supported-option usage.
+
 ## Contributing
 
 ```bash

apps/appservice/package.json

@@ -0,0 +1,35 @@
+{
+  "name": "@mosaicstack/mosaic-as",
+  "version": "0.0.1",
+  "type": "module",
+  "private": true,
+  "repository": {
+    "type": "git",
+    "url": "https://git.mosaicstack.dev/mosaicstack/stack.git",
+    "directory": "apps/appservice"
+  },
+  "main": "dist/main.js",
+  "bin": {
+    "mosaic-as": "dist/main.js",
+    "mosaic-as-registration": "dist/registration-main.js"
+  },
+  "scripts": {
+    "build": "tsc",
+    "lint": "eslint src",
+    "typecheck": "tsc --noEmit",
+    "test": "vitest run --passWithNoTests",
+    "dev": "tsx watch src/main.ts"
+  },
+  "dependencies": {
+    "@mosaicstack/appservice": "workspace:*"
+  },
+  "devDependencies": {
+    "@types/node": "^22.0.0",
+    "tsx": "^4.19.0",
+    "typescript": "^5.8.0",
+    "vitest": "^2.0.0"
+  },
+  "files": [
+    "dist"
+  ]
+}

apps/appservice/src/__tests__/server.test.ts

@@ -0,0 +1,388 @@
+import { describe, expect, it, vi } from 'vitest';
+
+import { AppserviceDaemon } from '../server.js';
+import type { DaemonConfig, DaemonRequest } from '../server.js';
+
+const AGENTS_TYPE = 'org.uscllc.mosaic_as.agents';
+
+const cfg: DaemonConfig = {
+  homeserverUrl: 'https://hs.example',
+  domain: 'hs.example',
+  asToken: 'as-secret',
+  hsToken: 'hs-secret',
+  bridgeTokens: ['bridge-secret'],
+};
+
+const jsonResponse = (status: number, body: unknown): Response =>
+  new Response(JSON.stringify(body), { status, headers: { 'Content-Type': 'application/json' } });
+
+const request = (overrides: Partial<DaemonRequest>): DaemonRequest => ({
+  method: 'GET',
+  path: '/',
+  searchParams: new URLSearchParams(),
+  body: undefined,
+  ...overrides,
+});
+
+const makeDaemon = () => {
+  const fetchMock = vi.fn(async (_input: URL | string) => jsonResponse(200, { event_id: '$sent' }));
+  const daemon = new AppserviceDaemon(cfg, fetchMock as unknown as typeof fetch, () => {});
+  return { daemon, fetchMock };
+};
+
+describe('AppserviceDaemon routing', () => {
+  it('serves health unauthenticated', async () => {
+    const { daemon } = makeDaemon();
+    expect((await daemon.handle(request({ path: '/health' }))).status).toBe(200);
+  });
+
+  it('404s unknown paths', async () => {
+    const { daemon } = makeDaemon();
+    expect((await daemon.handle(request({ path: '/nope' }))).status).toBe(404);
+  });
+
+  it('transactions require the hs_token', async () => {
+    const { daemon } = makeDaemon();
+    const bad = await daemon.handle(
+      request({
+        method: 'PUT',
+        path: '/_matrix/app/v1/transactions/t1',
+        authorizationHeader: 'Bearer wrong',
+        body: { events: [] },
+      }),
+    );
+    expect(bad.status).toBe(403);
+    const ok = await daemon.handle(
+      request({
+        method: 'PUT',
+        path: '/_matrix/app/v1/transactions/t1',
+        authorizationHeader: 'Bearer hs-secret',
+        body: { events: [{ type: 'm.room.message', event_id: '$e' }] },
+      }),
+    );
+    expect(ok.status).toBe(200);
+  });
+
+  it('bridge requires a bridge token (hs/as tokens do not work)', async () => {
+    const { daemon } = makeDaemon();
+    for (const token of [undefined, 'Bearer hs-secret', 'Bearer as-secret', 'Bearer nope']) {
+      const res = await daemon.handle(
+        request({
+          method: 'POST',
+          path: '/bridge/v1/messages',
+          authorizationHeader: token,
+          body: {},
+        }),
+      );
+      expect(res.status).toBe(403);
+    }
+  });
+
+  it('bridge message sends as the agent and returns the event id', async () => {
+    const { daemon, fetchMock } = makeDaemon();
+    const res = await daemon.handle(
+      request({
+        method: 'POST',
+        path: '/bridge/v1/messages',
+        authorizationHeader: 'Bearer bridge-secret',
+        body: { room_id: '!r:hs.example', agent: 'pi0-web1', body: 'hi', thread_root: '$req' },
+      }),
+    );
+    expect(res.status).toBe(200);
+    expect(res.body.event_id).toBe('$sent');
+    const sendCall = fetchMock.mock.calls
+      .map((c) => new URL(String(c[0])))
+      .find((u) => u.pathname.includes('/send/m.room.message/'));
+    expect(sendCall).toBeDefined();
+    expect(sendCall!.searchParams.get('user_id')).toBe('@agent-pi0-web1:hs.example');
+  });
+
+  it('bridge rejects invalid payloads with 400', async () => {
+    const { daemon } = makeDaemon();
+    const res = await daemon.handle(
+      request({
+        method: 'POST',
+        path: '/bridge/v1/messages',
+        authorizationHeader: 'Bearer bridge-secret',
+        body: { room_id: 'bad', agent: 'pi0', body: 'x' },
+      }),
+    );
+    expect(res.status).toBe(400);
+  });
+
+  it('bridge typing endpoint works', async () => {
+    const { daemon, fetchMock } = makeDaemon();
+    const res = await daemon.handle(
+      request({
+        method: 'POST',
+        path: '/bridge/v1/typing',
+        authorizationHeader: 'Bearer bridge-secret',
+        body: { room_id: '!r:hs.example', agent: 'pi0-web1', typing: true },
+      }),
+    );
+    expect(res.status).toBe(200);
+    const typingCall = fetchMock.mock.calls
+      .map((c) => new URL(String(c[0])))
+      .find((u) => u.pathname.includes('/typing/'));
+    expect(typingCall).toBeDefined();
+  });
+
+  it('authenticated unknown bridge sub-paths return 405, never fall through', async () => {
+    const { daemon } = makeDaemon();
+    const res = await daemon.handle(
+      request({
+        method: 'GET',
+        path: '/bridge/v1/unknown',
+        authorizationHeader: 'Bearer bridge-secret',
+      }),
+    );
+    expect(res.status).toBe(405);
+  });
+
+  it('provisions a room as the AS sender with space linking', async () => {
+    const calls: Array<{ url: URL; body: unknown }> = [];
+    const fetchMock = vi.fn(async (input: URL | string, init?: RequestInit) => {
+      const url = new URL(String(input));
+      calls.push({ url, body: init?.body ? JSON.parse(String(init.body)) : undefined });
+      if (url.pathname.endsWith('/createRoom'))
+        return jsonResponse(200, { room_id: '!new:hs.example' });
+      return jsonResponse(200, {});
+    });
+    const daemon = new AppserviceDaemon(cfg, fetchMock as unknown as typeof fetch, () => {});
+    const res = await daemon.handle(
+      request({
+        method: 'POST',
+        path: '/bridge/v1/provision/rooms',
+        authorizationHeader: 'Bearer bridge-secret',
+        body: {
+          name: 'proj-x',
+          alias: 'mosaic-proj-x',
+          invite: ['@jason.woltje:hs.example'],
+          space_id: '!space:hs.example',
+        },
+      }),
+    );
+    expect(res.status).toBe(200);
+    expect(res.body.room_id).toBe('!new:hs.example');
+    expect(res.body.space_linked).toBe(true);
+    const create = calls.find((c) => c.url.pathname.endsWith('/createRoom'));
+    expect(create!.url.searchParams.get('user_id')).toBe('@mosaic-as:hs.example');
+    const body = create!.body as Record<string, unknown>;
+    expect(body.room_alias_name).toBe('mosaic-proj-x');
+    expect((body.power_level_content_override as Record<string, unknown>).users).toEqual({
+      '@mosaic-as:hs.example': 100,
+    });
+    expect(calls.some((c) => c.url.pathname.includes('/state/m.space.child/'))).toBe(true);
+    expect(calls.some((c) => c.url.pathname.includes('/state/m.space.parent/'))).toBe(true);
+  });
+
+  it('space-link failure still returns the room id (no orphan)', async () => {
+    const fetchMock = vi.fn(async (input: URL | string) => {
+      const url = new URL(String(input));
+      if (url.pathname.endsWith('/createRoom'))
+        return jsonResponse(200, { room_id: '!new:hs.example' });
+      if (url.pathname.includes('/state/m.space.child/'))
+        return jsonResponse(403, { errcode: 'M_FORBIDDEN', error: 'no PL in space' });
+      return jsonResponse(200, {});
+    });
+    const daemon = new AppserviceDaemon(cfg, fetchMock as unknown as typeof fetch, () => {});
+    const res = await daemon.handle(
+      request({
+        method: 'POST',
+        path: '/bridge/v1/provision/rooms',
+        authorizationHeader: 'Bearer bridge-secret',
+        body: { name: 'proj-x', space_id: '!space:hs.example' },
+      }),
+    );
+    expect(res.status).toBe(200);
+    expect(res.body.room_id).toBe('!new:hs.example');
+    expect(res.body.space_linked).toBe(false);
+    expect(String(res.body.space_error)).toContain('403');
+  });
+
+  it('invite list cap enforced', async () => {
+    const { daemon } = makeDaemon();
+    const res = await daemon.handle(
+      request({
+        method: 'POST',
+        path: '/bridge/v1/provision/rooms',
+        authorizationHeader: 'Bearer bridge-secret',
+        body: { name: 'x', invite: Array.from({ length: 51 }, (_, i) => `@u${i}:hs`) },
+      }),
+    );
+    expect(res.status).toBe(400);
+  });
+
+  it('provision rejects bad payloads and requires auth', async () => {
+    const { daemon } = makeDaemon();
+    const noAuth = await daemon.handle(
+      request({ method: 'POST', path: '/bridge/v1/provision/rooms', body: { name: 'x' } }),
+    );
+    expect(noAuth.status).toBe(403);
+    const bad = await daemon.handle(
+      request({
+        method: 'POST',
+        path: '/bridge/v1/provision/rooms',
+        authorizationHeader: 'Bearer bridge-secret',
+        body: { name: '', alias: 'BAD ALIAS' },
+      }),
+    );
+    expect(bad.status).toBe(400);
+  });
+
+  // A daemon whose fetch mock backs account_data with a mutable in-test object,
+  // so register/verify/revoke round-trip through the (faked) homeserver.
+  const makeAgentDaemon = () => {
+    const accountData: { value: Record<string, unknown> | null } = { value: null };
+    const fetchMock = vi.fn(async (input: URL | string, init?: RequestInit) => {
+      const url = new URL(String(input));
+      const path = url.pathname;
+      if (path.includes(`/account_data/${AGENTS_TYPE}`)) {
+        if (init?.method === 'PUT') {
+          accountData.value = JSON.parse(String(init.body)) as Record<string, unknown>;
+          return jsonResponse(200, {});
+        }
+        if (accountData.value === null) {
+          return jsonResponse(404, { errcode: 'M_NOT_FOUND', error: 'not found' });
+        }
+        return jsonResponse(200, accountData.value);
+      }
+      if (path.endsWith('/register')) return jsonResponse(200, { user_id: 'whatever' });
+      if (path.includes('/send/m.room.message/')) return jsonResponse(200, { event_id: '$sent' });
+      return jsonResponse(200, {});
+    });
+    const daemon = new AppserviceDaemon(cfg, fetchMock as unknown as typeof fetch, () => {});
+    return { daemon, fetchMock };
+  };
+
+  const registerAgent = async (
+    daemon: AppserviceDaemon,
+    body: Record<string, unknown> = { alias: 'pi0', host: 'web1' },
+  ) =>
+    daemon.handle(
+      request({
+        method: 'POST',
+        path: '/bridge/v1/agents',
+        authorizationHeader: 'Bearer bridge-secret',
+        body,
+      }),
+    );
+
+  it('host token registers an agent and returns agent_user_id + bridge_token', async () => {
+    const { daemon, fetchMock } = makeAgentDaemon();
+    const res = await registerAgent(daemon, { alias: 'pi0', host: 'web1' });
+    expect(res.status).toBe(200);
+    expect(res.body.agent_user_id).toBe('@agent-pi0-web1:hs.example');
+    expect(String(res.body.bridge_token).startsWith('magt_')).toBe(true);
+    const registerCall = fetchMock.mock.calls
+      .map((c) => new URL(String(c[0])))
+      .find((u) => u.pathname.endsWith('/register'));
+    expect(registerCall).toBeDefined();
+  });
+
+  it('register requires a HOST token (agent token and no token are 403)', async () => {
+    const { daemon } = makeAgentDaemon();
+    const minted = await registerAgent(daemon);
+    const agentToken = String(minted.body.bridge_token);
+
+    const asAgent = await daemon.handle(
+      request({
+        method: 'POST',
+        path: '/bridge/v1/agents',
+        authorizationHeader: `Bearer ${agentToken}`,
+        body: { alias: 'pi1', host: 'web2' },
+      }),
+    );
+    expect(asAgent.status).toBe(403);
+
+    const noAuth = await daemon.handle(
+      request({ method: 'POST', path: '/bridge/v1/agents', body: { alias: 'pi1', host: 'web2' } }),
+    );
+    expect(noAuth.status).toBe(403);
+  });
+
+  it('agent-scoped token may send as itself but not as another agent', async () => {
+    const { daemon } = makeAgentDaemon();
+    const minted = await registerAgent(daemon, { alias: 'pi0', host: 'web1' });
+    const agentToken = String(minted.body.bridge_token);
+
+    const self = await daemon.handle(
+      request({
+        method: 'POST',
+        path: '/bridge/v1/messages',
+        authorizationHeader: `Bearer ${agentToken}`,
+        body: { room_id: '!r:hs.example', agent: 'pi0-web1', body: 'hi' },
+      }),
+    );
+    expect(self.status).toBe(200);
+
+    const other = await daemon.handle(
+      request({
+        method: 'POST',
+        path: '/bridge/v1/messages',
+        authorizationHeader: `Bearer ${agentToken}`,
+        body: { room_id: '!r:hs.example', agent: 'pi9-web9', body: 'hi' },
+      }),
+    );
+    expect(other.status).toBe(403);
+    expect(other.body.error).toBe('token not scoped to this agent');
+  });
+
+  it('revoked agent token is rejected on messages', async () => {
+    const { daemon } = makeAgentDaemon();
+    const minted = await registerAgent(daemon, { alias: 'pi0', host: 'web1' });
+    const agentToken = String(minted.body.bridge_token);
+
+    const revoke = await daemon.handle(
+      request({
+        method: 'POST',
+        path: '/bridge/v1/agents/revoke',
+        authorizationHeader: 'Bearer bridge-secret',
+        body: { agent_user_id: '@agent-pi0-web1:hs.example' },
+      }),
+    );
+    expect(revoke.status).toBe(200);
+    expect(revoke.body.revoked).toBe(1);
+
+    const afterRevoke = await daemon.handle(
+      request({
+        method: 'POST',
+        path: '/bridge/v1/messages',
+        authorizationHeader: `Bearer ${agentToken}`,
+        body: { room_id: '!r:hs.example', agent: 'pi0-web1', body: 'hi' },
+      }),
+    );
+    expect(afterRevoke.status).toBe(403);
+  });
+
+  it('GET /bridge/v1/agents lists registered agents (host only)', async () => {
+    const { daemon } = makeAgentDaemon();
+    await registerAgent(daemon, { alias: 'pi0', host: 'web1', display_name: 'Pi Zero' });
+
+    const res = await daemon.handle(
+      request({
+        method: 'GET',
+        path: '/bridge/v1/agents',
+        authorizationHeader: 'Bearer bridge-secret',
+      }),
+    );
+    expect(res.status).toBe(200);
+    const agents = res.body.agents as Array<Record<string, unknown>>;
+    expect(agents).toHaveLength(1);
+    expect(agents[0]?.agent_user_id).toBe('@agent-pi0-web1:hs.example');
+    expect(agents[0]?.display_name).toBe('Pi Zero');
+  });
+
+  it('empty bridge token list denies everything', async () => {
+    const daemon = new AppserviceDaemon({ ...cfg, bridgeTokens: [] }, undefined, () => {});
+    const res = await daemon.handle(
+      request({
+        method: 'POST',
+        path: '/bridge/v1/typing',
+        authorizationHeader: 'Bearer bridge-secret',
+        body: {},
+      }),
+    );
+    expect(res.status).toBe(403);
+  });
+});

apps/appservice/src/config.ts

@@ -0,0 +1,23 @@
+import type { DaemonConfig } from './server.js';
+
+const required = (name: string): string => {
+  const value = process.env[name];
+  if (!value) throw new Error(`missing required env var ${name}`);
+  return value;
+};
+
+export function configFromEnv(): DaemonConfig & { port: number } {
+  return {
+    homeserverUrl: required('MOSAIC_AS_HOMESERVER_URL'),
+    domain: required('MOSAIC_AS_DOMAIN'),
+    asToken: required('MOSAIC_AS_TOKEN'),
+    hsToken: required('MOSAIC_HS_TOKEN'),
+    userPrefix: process.env.MOSAIC_AS_USER_PREFIX ?? 'agent-',
+    senderLocalpart: process.env.MOSAIC_AS_SENDER_LOCALPART ?? 'mosaic-as',
+    bridgeTokens: (process.env.MOSAIC_AS_BRIDGE_TOKENS ?? '')
+      .split(',')
+      .map((t) => t.trim())
+      .filter(Boolean),
+    port: Number(process.env.MOSAIC_AS_PORT ?? 8008),
+  };
+}

apps/appservice/src/main.ts

@@ -0,0 +1,67 @@
+import http from 'node:http';
+
+import { configFromEnv } from './config.js';
+import { AppserviceDaemon } from './server.js';
+
+const cfg = configFromEnv();
+const daemon = new AppserviceDaemon(cfg);
+
+const MAX_BODY_BYTES = 1024 * 1024;
+
+const server = http.createServer((req, res) => {
+  const chunks: Buffer[] = [];
+  let received = 0;
+  let rejected = false;
+  req.on('data', (chunk: Buffer) => {
+    received += chunk.length;
+    if (received > MAX_BODY_BYTES) {
+      rejected = true;
+      res.writeHead(413, { 'Content-Type': 'application/json' });
+      res.end(JSON.stringify({ errcode: 'M_TOO_LARGE', error: 'request body too large' }));
+      req.destroy();
+      return;
+    }
+    chunks.push(chunk);
+  });
+  req.on('end', () => {
+    if (rejected) return;
+    void (async () => {
+      const url = new URL(req.url ?? '/', 'http://localhost');
+      let body: unknown;
+      try {
+        const raw = Buffer.concat(chunks).toString();
+        body = raw ? JSON.parse(raw) : undefined;
+      } catch {
+        res.writeHead(400, { 'Content-Type': 'application/json' });
+        res.end(JSON.stringify({ errcode: 'M_NOT_JSON', error: 'invalid json' }));
+        return;
+      }
+      const result = await daemon.handle({
+        method: req.method ?? 'GET',
+        path: url.pathname,
+        searchParams: url.searchParams,
+        authorizationHeader: req.headers.authorization,
+        body,
+      });
+      res.writeHead(result.status, { 'Content-Type': 'application/json' });
+      res.end(JSON.stringify(result.body));
+    })().catch((error: unknown) => {
+      console.error('request failed:', error);
+      if (res.headersSent) {
+        res.destroy();
+        return;
+      }
+      res.writeHead(500, { 'Content-Type': 'application/json' });
+      res.end(JSON.stringify({ error: 'internal error' }));
+    });
+  });
+});
+
+server.listen(cfg.port, () => {
+  console.log(
+    `mosaic-as listening on :${cfg.port} (homeserver ${cfg.homeserverUrl}, domain ${cfg.domain})`,
+  );
+  if (cfg.bridgeTokens.length === 0) {
+    console.warn('WARNING: MOSAIC_AS_BRIDGE_TOKENS is empty — bridge API will deny all requests');
+  }
+});

apps/appservice/src/registration-main.ts

@@ -0,0 +1,10 @@
+import { buildRegistration, registrationToYaml } from '@mosaicstack/appservice';
+
+import { configFromEnv } from './config.js';
+
+// Prints the Synapse registration YAML (mosaic-as.yaml) for the current env.
+// Usage: MOSAIC_AS_URL=http://mosaic-as:8008 mosaic-as-registration > mosaic-as.yaml
+const cfg = configFromEnv();
+const url = process.env.MOSAIC_AS_URL;
+if (!url) throw new Error('missing required env var MOSAIC_AS_URL');
+process.stdout.write(registrationToYaml(buildRegistration(cfg, { url })));

apps/appservice/src/server.ts

@@ -0,0 +1,225 @@
+import { createHmac, randomBytes, timingSafeEqual } from 'node:crypto';
+
+import {
+  AgentTokenStore,
+  AppserviceIntent,
+  TransactionHandler,
+  validateBridgeMessage,
+  validateBridgeTyping,
+  validateProvisionRoom,
+  validateRegisterAgent,
+  validateRevokeAgent,
+} from '@mosaicstack/appservice';
+import type { AppserviceConfig, MatrixEvent } from '@mosaicstack/appservice';
+
+export interface DaemonConfig extends AppserviceConfig {
+  /** Bearer tokens accepted on /bridge/v1/* (one per agent-comms host daemon). */
+  bridgeTokens: string[];
+}
+
+export interface DaemonRequest {
+  method: string;
+  /** URL path without query string. */
+  path: string;
+  searchParams: URLSearchParams;
+  authorizationHeader?: string;
+  body: unknown;
+}
+
+export interface DaemonResponse {
+  status: number;
+  body: Record<string, unknown>;
+}
+
+// Compare equal-length HMAC digests so neither content nor LENGTH of the
+// stored secret is observable through timing.
+const HMAC_KEY = randomBytes(32);
+const digest = (value: string): Buffer => createHmac('sha256', HMAC_KEY).update(value).digest();
+
+const safeEqual = (a: string, b: string): boolean => timingSafeEqual(digest(a), digest(b));
+
+const TXN_PATH = /^\/_matrix\/app\/v1\/transactions\/([^/]+)$/;
+
+/**
+ * Resolved identity for an authenticated /bridge/v1/* caller. Host principals
+ * (the agent-comms host daemons) are unrestricted; agent principals are scoped
+ * to a single virtual user and may only act as themselves.
+ */
+export type BridgePrincipal = { kind: 'host' } | { kind: 'agent'; agentUserId: string } | null;
+
+/**
+ * HTTP-framework-agnostic request router for the mosaic-as daemon: the
+ * Application Service transactions endpoint (Synapse-facing) plus the
+ * internal bridge API v1 (agent-comms daemon-facing). main.ts binds this to
+ * node:http; tests drive it directly.
+ */
+export class AppserviceDaemon {
+  readonly intent: AppserviceIntent;
+  private readonly transactions: TransactionHandler;
+  private readonly agents: AgentTokenStore;
+
+  constructor(
+    private readonly cfg: DaemonConfig,
+    fetchImpl?: typeof fetch,
+    private readonly log: (line: string) => void = (line) => console.log(line),
+  ) {
+    this.intent = new AppserviceIntent(cfg, fetchImpl);
+    this.agents = new AgentTokenStore(this.intent);
+    this.transactions = new TransactionHandler({
+      hsToken: cfg.hsToken,
+      onEvent: (event) => this.onEvent(event),
+      onError: (error, txnId) => this.log(`txn ${txnId} handler error: ${String(error)}`),
+    });
+  }
+
+  /** v1: the daemon only observes; room logic lives in the agent-comms daemons. */
+  private onEvent(event: MatrixEvent): void {
+    if (event.type === 'm.room.message') {
+      this.log(
+        `event ${event.event_id ?? '?'} in ${event.room_id ?? '?'} from ${event.sender ?? '?'}`,
+      );
+    }
+  }
+
+  /** Resolve the calling principal, or null when unauthorized. Fail-closed:
+   * host tokens win (timing-safe compare); otherwise a magt_* bearer is looked
+   * up in the agent token store; anything else is rejected. */
+  private async bridgeAuthorized(
+    authorizationHeader: string | undefined,
+  ): Promise<BridgePrincipal> {
+    if (!authorizationHeader?.startsWith('Bearer ')) return null;
+    const presented = authorizationHeader.slice('Bearer '.length);
+    if (this.cfg.bridgeTokens.some((token) => safeEqual(presented, token))) {
+      return { kind: 'host' };
+    }
+    const agentUserId = await this.agents.verifyToken(presented);
+    if (agentUserId) return { kind: 'agent', agentUserId };
+    return null;
+  }
+
+  async handle(req: DaemonRequest): Promise<DaemonResponse> {
+    if (req.method === 'GET' && req.path === '/health') {
+      return { status: 200, body: { ok: true } };
+    }
+
+    const txnMatch = req.method === 'PUT' ? TXN_PATH.exec(req.path) : null;
+    if (txnMatch?.[1] !== undefined) {
+      return this.transactions.handle(txnMatch[1], req.body, {
+        authorizationHeader: req.authorizationHeader,
+        accessTokenParam: req.searchParams.get('access_token') ?? undefined,
+      });
+    }
+
+    if (req.path.startsWith('/bridge/v1/')) {
+      const principal = await this.bridgeAuthorized(req.authorizationHeader);
+      if (!principal) {
+        return { status: 403, body: { errcode: 'M_FORBIDDEN', error: 'bad bridge token' } };
+      }
+      try {
+        if (req.method === 'POST' && req.path === '/bridge/v1/agents') {
+          if (principal.kind !== 'host') {
+            return {
+              status: 403,
+              body: { errcode: 'M_FORBIDDEN', error: 'agents cannot register agents' },
+            };
+          }
+          validateRegisterAgent(req.body);
+          const { agentUserId, token } = await this.agents.register({
+            alias: req.body.alias,
+            host: req.body.host,
+            displayName: req.body.display_name,
+          });
+          this.log(`registered agent ${agentUserId}`);
+          return { status: 200, body: { agent_user_id: agentUserId, bridge_token: token } };
+        }
+        if (req.method === 'POST' && req.path === '/bridge/v1/agents/revoke') {
+          if (principal.kind !== 'host') {
+            return {
+              status: 403,
+              body: { errcode: 'M_FORBIDDEN', error: 'agents cannot revoke agents' },
+            };
+          }
+          validateRevokeAgent(req.body);
+          const revoked = await this.agents.revoke(req.body.agent_user_id);
+          this.log(`revoked ${revoked} token(s) for ${req.body.agent_user_id}`);
+          return { status: 200, body: { revoked } };
+        }
+        if (req.method === 'GET' && req.path === '/bridge/v1/agents') {
+          if (principal.kind !== 'host') {
+            return {
+              status: 403,
+              body: { errcode: 'M_FORBIDDEN', error: 'agents cannot list agents' },
+            };
+          }
+          const agents = await this.agents.list();
+          return { status: 200, body: { agents } };
+        }
+        if (req.method === 'POST' && req.path === '/bridge/v1/messages') {
+          validateBridgeMessage(req.body);
+          if (
+            principal.kind === 'agent' &&
+            this.intent.agentUserId(req.body.agent) !== principal.agentUserId
+          ) {
+            return {
+              status: 403,
+              body: { errcode: 'M_FORBIDDEN', error: 'token not scoped to this agent' },
+            };
+          }
+          const eventId = await this.intent.sendAsAgent({
+            roomId: req.body.room_id,
+            agent: req.body.agent,
+            body: req.body.body,
+            threadRoot: req.body.thread_root,
+            msgtype: req.body.msgtype,
+            extraContent: req.body.extra_content,
+          });
+          return { status: 200, body: { event_id: eventId ?? null } };
+        }
+        if (req.method === 'POST' && req.path === '/bridge/v1/typing') {
+          validateBridgeTyping(req.body);
+          if (
+            principal.kind === 'agent' &&
+            this.intent.agentUserId(req.body.agent) !== principal.agentUserId
+          ) {
+            return {
+              status: 403,
+              body: { errcode: 'M_FORBIDDEN', error: 'token not scoped to this agent' },
+            };
+          }
+          await this.intent.setTyping(req.body.room_id, req.body.agent, req.body.typing);
+          return { status: 200, body: {} };
+        }
+        if (req.method === 'POST' && req.path === '/bridge/v1/provision/rooms') {
+          validateProvisionRoom(req.body);
+          const result = await this.intent.createRoom({
+            name: req.body.name,
+            alias: req.body.alias,
+            topic: req.body.topic,
+            invite: req.body.invite,
+            spaceId: req.body.space_id,
+          });
+          this.log(
+            `provisioned room ${result.roomId} (${req.body.name}) space_linked=${result.spaceLinked}`,
+          );
+          return {
+            status: 200,
+            body: {
+              room_id: result.roomId,
+              space_linked: result.spaceLinked,
+              ...(result.spaceError ? { space_error: result.spaceError } : {}),
+            },
+          };
+        }
+      } catch (error) {
+        const message = error instanceof Error ? error.message : String(error);
+        this.log(`bridge error ${req.method} ${req.path}: ${message}`);
+        return { status: 400, body: { error: message } };
+      }
+      // Explicit: never fall out of the authenticated bridge block, so future
+      // sub-paths cannot accidentally route around the auth guard above.
+      return { status: 405, body: { error: 'unsupported bridge method/path' } };
+    }
+
+    return { status: 404, body: { error: 'not found' } };
+  }
+}

apps/appservice/tsconfig.json

@@ -0,0 +1,9 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "dist",
+    "rootDir": "src"
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules", "dist"]
+}

apps/gateway/package.json

@@ -3,7 +3,7 @@
   "version": "0.0.6",
   "repository": {
     "type": "git",
-    "url": "https://git.mosaicstack.dev/mosaicstack/mosaic-stack.git",
+    "url": "https://git.mosaicstack.dev/mosaicstack/stack.git",
     "directory": "apps/gateway"
   },
   "type": "module",
@@ -31,6 +31,7 @@
     "@mariozechner/pi-ai": "^0.65.0",
     "@mariozechner/pi-coding-agent": "^0.65.0",
     "@modelcontextprotocol/sdk": "^1.27.1",
+    "@mosaicstack/agent": "workspace:^",
     "@mosaicstack/auth": "workspace:^",
     "@mosaicstack/brain": "workspace:^",
     "@mosaicstack/config": "workspace:^",
@@ -56,6 +57,7 @@
     "@opentelemetry/sdk-metrics": "^2.6.0",
     "@opentelemetry/sdk-node": "^0.213.0",
     "@opentelemetry/semantic-conventions": "^1.40.0",
+    "@peculiar/x509": "^2.0.0",
     "@sinclair/typebox": "^0.34.48",
     "better-auth": "^1.5.5",
     "bullmq": "^5.71.0",
@@ -63,12 +65,16 @@
     "class-validator": "^0.15.1",
     "dotenv": "^17.3.1",
     "fastify": "^5.0.0",
+    "ioredis": "^5.10.0",
+    "jose": "^6.2.2",
     "node-cron": "^4.2.1",
     "openai": "^6.32.0",
+    "postgres": "^3.4.8",
     "reflect-metadata": "^0.2.0",
     "rxjs": "^7.8.0",
     "socket.io": "^4.8.0",
     "uuid": "^11.0.0",
+    "undici": "^7.24.6",
     "zod": "^4.3.6"
   },
   "devDependencies": {

apps/gateway/src/__tests__/conversation-persistence.test.ts

@@ -417,7 +417,7 @@ describe('ConversationsController — search endpoint', () => {
       },
     ];
     brain = createMockBrain({ searchResults });
-    controller = new ConversationsController(brain as never);
+    controller = new ConversationsController(brain as never, { runtimeMode: 'legacy' });
   });
 
   it('returns matching messages for a valid search query', async () => {
@@ -479,7 +479,7 @@ describe('ConversationsController — search endpoint', () => {
 describe('ConversationsController — message CRUD', () => {
   it('listMessages returns 404 when conversation is not owned by user', async () => {
     const brain = createMockBrain({ conversation: undefined });
-    const controller = new ConversationsController(brain as never);
+    const controller = new ConversationsController(brain as never, { runtimeMode: 'legacy' });
 
     await expect(controller.listMessages(CONV_ID, { id: USER_ID })).rejects.toBeInstanceOf(
       NotFoundException,
@@ -489,7 +489,7 @@ describe('ConversationsController — message CRUD', () => {
   it('listMessages returns the messages for an owned conversation', async () => {
     const msgs = [makeMessage('user', 'Test message'), makeMessage('assistant', 'Test reply')];
     const brain = createMockBrain({ conversation: makeConversation(), messages: msgs });
-    const controller = new ConversationsController(brain as never);
+    const controller = new ConversationsController(brain as never, { runtimeMode: 'legacy' });
 
     const result = await controller.listMessages(CONV_ID, { id: USER_ID });
 
@@ -500,7 +500,7 @@ describe('ConversationsController — message CRUD', () => {
 
   it('addMessage returns the persisted message', async () => {
     const brain = createMockBrain({ conversation: makeConversation() });
-    const controller = new ConversationsController(brain as never);
+    const controller = new ConversationsController(brain as never, { runtimeMode: 'legacy' });
 
     const result = await controller.addMessage(
       CONV_ID,

apps/gateway/src/__tests__/integration/federated-boot.pg-unreachable.integration.test.ts

@@ -0,0 +1,64 @@
+/**
+ * Test B — Gateway boot refuses (fail-fast) when PG is unreachable.
+ *
+ * Prereq: docker compose -f docker-compose.federated.yml --profile federated up -d
+ *         (Valkey must be running; only PG is intentionally misconfigured.)
+ * Run:    FEDERATED_INTEGRATION=1 pnpm --filter @mosaicstack/gateway test src/__tests__/integration/federated-boot.pg-unreachable.integration.test.ts
+ *
+ * Skipped when FEDERATED_INTEGRATION !== '1'.
+ */
+
+import net from 'node:net';
+import { beforeAll, describe, expect, it } from 'vitest';
+import { TierDetectionError, detectAndAssertTier } from '@mosaicstack/storage';
+
+const run = process.env['FEDERATED_INTEGRATION'] === '1';
+
+const VALKEY_URL = 'redis://localhost:6380';
+
+/**
+ * Reserves a guaranteed-closed port at runtime by binding to an ephemeral OS
+ * port (port 0) and immediately releasing it. The OS will not reassign the
+ * port during the TIME_WAIT window, so it remains closed for the duration of
+ * this test.
+ */
+async function reserveClosedPort(): Promise<number> {
+  return new Promise((resolve, reject) => {
+    const server = net.createServer();
+    server.listen(0, '127.0.0.1', () => {
+      const addr = server.address();
+      if (typeof addr !== 'object' || !addr) return reject(new Error('no addr'));
+      const port = addr.port;
+      server.close(() => resolve(port));
+    });
+    server.on('error', reject);
+  });
+}
+
+describe.skipIf(!run)('federated boot — PG unreachable', () => {
+  let badPgUrl: string;
+
+  beforeAll(async () => {
+    const closedPort = await reserveClosedPort();
+    badPgUrl = `postgresql://mosaic:mosaic@localhost:${closedPort}/mosaic`;
+  });
+
+  it('detectAndAssertTier throws TierDetectionError with service: postgres when PG is down', async () => {
+    const brokenConfig = {
+      tier: 'federated' as const,
+      storage: {
+        type: 'postgres' as const,
+        url: badPgUrl,
+        enableVector: true,
+      },
+      queue: {
+        type: 'bullmq',
+        url: VALKEY_URL,
+      },
+    };
+
+    await expect(detectAndAssertTier(brokenConfig)).rejects.toSatisfy(
+      (err: unknown) => err instanceof TierDetectionError && err.service === 'postgres',
+    );
+  }, 10_000);
+});

apps/gateway/src/__tests__/integration/federated-boot.success.integration.test.ts

@@ -0,0 +1,50 @@
+/**
+ * Test A — Gateway boot succeeds when federated services are up.
+ *
+ * Prereq: docker compose -f docker-compose.federated.yml --profile federated up -d
+ * Run:    FEDERATED_INTEGRATION=1 pnpm --filter @mosaicstack/gateway test src/__tests__/integration/federated-boot.success.integration.test.ts
+ *
+ * Skipped when FEDERATED_INTEGRATION !== '1'.
+ */
+
+import postgres from 'postgres';
+import { afterAll, describe, expect, it } from 'vitest';
+import { detectAndAssertTier } from '@mosaicstack/storage';
+
+const run = process.env['FEDERATED_INTEGRATION'] === '1';
+
+const PG_URL = 'postgresql://mosaic:mosaic@localhost:5433/mosaic';
+const VALKEY_URL = 'redis://localhost:6380';
+
+const federatedConfig = {
+  tier: 'federated' as const,
+  storage: {
+    type: 'postgres' as const,
+    url: PG_URL,
+    enableVector: true,
+  },
+  queue: {
+    type: 'bullmq',
+    url: VALKEY_URL,
+  },
+};
+
+describe.skipIf(!run)('federated boot — success path', () => {
+  let sql: ReturnType<typeof postgres> | undefined;
+
+  afterAll(async () => {
+    if (sql) {
+      await sql.end({ timeout: 2 }).catch(() => {});
+    }
+  });
+
+  it('detectAndAssertTier resolves without throwing when federated services are up', async () => {
+    await expect(detectAndAssertTier(federatedConfig)).resolves.toBeUndefined();
+  }, 10_000);
+
+  it('pgvector extension is registered (pg_extension row exists)', async () => {
+    sql = postgres(PG_URL, { max: 1, connect_timeout: 5, idle_timeout: 5 });
+    const rows = await sql`SELECT * FROM pg_extension WHERE extname = 'vector'`;
+    expect(rows).toHaveLength(1);
+  }, 10_000);
+});

apps/gateway/src/__tests__/integration/federated-pgvector.integration.test.ts

@@ -0,0 +1,43 @@
+/**
+ * Test C — pgvector extension is functional end-to-end.
+ *
+ * Creates a temp table with a vector(3) column, inserts a row, and queries it
+ * back — confirming the extension is not just registered but operational.
+ *
+ * Prereq: docker compose -f docker-compose.federated.yml --profile federated up -d
+ * Run:    FEDERATED_INTEGRATION=1 pnpm --filter @mosaicstack/gateway test src/__tests__/integration/federated-pgvector.integration.test.ts
+ *
+ * Skipped when FEDERATED_INTEGRATION !== '1'.
+ */
+
+import postgres from 'postgres';
+import { afterAll, describe, expect, it } from 'vitest';
+
+const run = process.env['FEDERATED_INTEGRATION'] === '1';
+
+const PG_URL = 'postgresql://mosaic:mosaic@localhost:5433/mosaic';
+
+let sql: ReturnType<typeof postgres> | undefined;
+
+afterAll(async () => {
+  if (sql) {
+    await sql.end({ timeout: 2 }).catch(() => {});
+  }
+});
+
+describe.skipIf(!run)('federated pgvector — functional end-to-end', () => {
+  it('vector ops round-trip: INSERT [1,2,3] and SELECT returns [1,2,3]', async () => {
+    sql = postgres(PG_URL, { max: 1, connect_timeout: 5, idle_timeout: 5 });
+
+    await sql`CREATE TEMP TABLE t (id int, embedding vector(3))`;
+    await sql`INSERT INTO t VALUES (1, '[1,2,3]')`;
+    const rows = await sql`SELECT embedding FROM t`;
+
+    expect(rows).toHaveLength(1);
+    // The postgres driver returns vector columns as strings like '[1,2,3]'.
+    // Normalise by parsing the string representation.
+    const raw = rows[0]?.['embedding'] as string;
+    const parsed = JSON.parse(raw) as number[];
+    expect(parsed).toEqual([1, 2, 3]);
+  }, 10_000);
+});

apps/gateway/src/__tests__/integration/federation-m2-e2e.integration.test.ts

@@ -0,0 +1,243 @@
+/**
+ * Federation M2 E2E test — peer-add enrollment flow (FED-M2-10).
+ *
+ * Covers MILESTONES.md acceptance test #6:
+ *   "`peer add <url>` on Server A yields an `active` peer record with a valid cert + key"
+ *
+ * This test simulates two gateways using a single bootstrapped NestJS app:
+ *   - "Server A": the admin API that generates a keypair and stores the cert
+ *   - "Server B": the enrollment endpoint that signs the CSR
+ *   Both share the same DB + Step-CA in the test environment.
+ *
+ * Prerequisites:
+ *   docker compose -f docker-compose.federated.yml --profile federated up -d
+ *
+ * Run:
+ *   FEDERATED_INTEGRATION=1 STEP_CA_AVAILABLE=1 \
+ *   STEP_CA_URL=https://localhost:9000 \
+ *   STEP_CA_PROVISIONER_KEY_JSON="$(docker exec $(docker ps -qf name=step-ca) cat /home/step/secrets/mosaic-fed.json)" \
+ *   STEP_CA_ROOT_CERT_PATH=/tmp/step-ca-root.crt \
+ *   pnpm --filter @mosaicstack/gateway test \
+ *     src/__tests__/integration/federation-m2-e2e.integration.test.ts
+ *
+ * Obtaining Step-CA credentials:
+ *   # Extract provisioner key from running container:
+ *   #   docker exec $(docker ps -qf name=step-ca) cat /home/step/secrets/mosaic-fed.json
+ *   # Copy root cert from container:
+ *   #   docker cp $(docker ps -qf name=step-ca):/home/step/certs/root_ca.crt /tmp/step-ca-root.crt
+ *   # Then: export STEP_CA_ROOT_CERT_PATH=/tmp/step-ca-root.crt
+ *
+ * Skipped unless both FEDERATED_INTEGRATION=1 and STEP_CA_AVAILABLE=1 are set.
+ */
+
+import * as crypto from 'node:crypto';
+import { afterAll, beforeAll, describe, expect, it } from 'vitest';
+import { Test } from '@nestjs/testing';
+import { ValidationPipe } from '@nestjs/common';
+import { FastifyAdapter, type NestFastifyApplication } from '@nestjs/platform-fastify';
+import supertest from 'supertest';
+import {
+  createDb,
+  type Db,
+  type DbHandle,
+  federationPeers,
+  federationGrants,
+  federationEnrollmentTokens,
+  inArray,
+  eq,
+} from '@mosaicstack/db';
+import * as schema from '@mosaicstack/db';
+import { DB } from '../../database/database.module.js';
+import { AdminGuard } from '../../admin/admin.guard.js';
+import { FederationModule } from '../../federation/federation.module.js';
+import { GrantsService } from '../../federation/grants.service.js';
+import { EnrollmentService } from '../../federation/enrollment.service.js';
+
+const run = process.env['FEDERATED_INTEGRATION'] === '1';
+const stepCaRun =
+  run &&
+  process.env['STEP_CA_AVAILABLE'] === '1' &&
+  !!process.env['STEP_CA_URL'] &&
+  !!process.env['STEP_CA_PROVISIONER_KEY_JSON'] &&
+  !!process.env['STEP_CA_ROOT_CERT_PATH'];
+
+const PG_URL = 'postgresql://mosaic:mosaic@localhost:5433/mosaic';
+
+const RUN_ID = crypto.randomUUID();
+
+describe.skipIf(!stepCaRun)('federation M2 E2E — peer add enrollment flow', () => {
+  let handle: DbHandle;
+  let db: Db;
+  let app: NestFastifyApplication;
+  let agent: ReturnType<typeof supertest>;
+  let grantsService: GrantsService;
+  let enrollmentService: EnrollmentService;
+
+  const createdTokenGrantIds: string[] = [];
+  const createdGrantIds: string[] = [];
+  const createdPeerIds: string[] = [];
+  const createdUserIds: string[] = [];
+
+  beforeAll(async () => {
+    process.env['BETTER_AUTH_SECRET'] ??= 'test-e2e-sealing-key';
+
+    handle = createDb(PG_URL);
+    db = handle.db;
+
+    const moduleRef = await Test.createTestingModule({
+      imports: [FederationModule],
+      providers: [{ provide: DB, useValue: db }],
+    })
+      .overrideGuard(AdminGuard)
+      .useValue({ canActivate: () => true })
+      .compile();
+
+    app = moduleRef.createNestApplication<NestFastifyApplication>(new FastifyAdapter());
+    app.useGlobalPipes(new ValidationPipe({ whitelist: true, transform: true }));
+    await app.init();
+    await app.getHttpAdapter().getInstance().ready();
+
+    agent = supertest(app.getHttpServer());
+
+    grantsService = moduleRef.get(GrantsService);
+    enrollmentService = moduleRef.get(EnrollmentService);
+  }, 30_000);
+
+  afterAll(async () => {
+    if (db && createdTokenGrantIds.length > 0) {
+      await db
+        .delete(federationEnrollmentTokens)
+        .where(inArray(federationEnrollmentTokens.grantId, createdTokenGrantIds))
+        .catch((e: unknown) => console.error('[federation-m2-e2e cleanup]', e));
+    }
+    if (db && createdGrantIds.length > 0) {
+      await db
+        .delete(federationGrants)
+        .where(inArray(federationGrants.id, createdGrantIds))
+        .catch((e: unknown) => console.error('[federation-m2-e2e cleanup]', e));
+    }
+    if (db && createdPeerIds.length > 0) {
+      await db
+        .delete(federationPeers)
+        .where(inArray(federationPeers.id, createdPeerIds))
+        .catch((e: unknown) => console.error('[federation-m2-e2e cleanup]', e));
+    }
+    if (db && createdUserIds.length > 0) {
+      await db
+        .delete(schema.users)
+        .where(inArray(schema.users.id, createdUserIds))
+        .catch((e: unknown) => console.error('[federation-m2-e2e cleanup]', e));
+    }
+    if (app)
+      await app.close().catch((e: unknown) => console.error('[federation-m2-e2e cleanup]', e));
+    if (handle)
+      await handle.close().catch((e: unknown) => console.error('[federation-m2-e2e cleanup]', e));
+  });
+
+  // -------------------------------------------------------------------------
+  // #6 — peer add: keypair → enrollment → cert storage → active peer record
+  // -------------------------------------------------------------------------
+  it('#6 — peer add flow: keypair → enrollment → cert storage → active peer record', async () => {
+    // Create a subject user to satisfy FK on federation_grants.subject_user_id
+    const userId = crypto.randomUUID();
+    await db
+      .insert(schema.users)
+      .values({
+        id: userId,
+        name: `e2e-user-${RUN_ID}`,
+        email: `e2e-${RUN_ID}@federation-test.invalid`,
+        emailVerified: false,
+      })
+      .onConflictDoNothing();
+    createdUserIds.push(userId);
+
+    // ── Step A: "Server B" setup ─────────────────────────────────────────
+    // Server B admin creates a grant and generates an enrollment token to
+    // share out-of-band with Server A's operator.
+
+    // Insert a placeholder peer on "Server B" to satisfy the grant FK
+    const serverBPeerId = crypto.randomUUID();
+    await db
+      .insert(federationPeers)
+      .values({
+        id: serverBPeerId,
+        commonName: `server-b-peer-${RUN_ID}`,
+        displayName: 'Server B Placeholder',
+        certPem: '-----BEGIN CERTIFICATE-----\nMOCK\n-----END CERTIFICATE-----\n',
+        certSerial: `serial-b-${serverBPeerId}`,
+        certNotAfter: new Date(Date.now() + 365 * 24 * 60 * 60 * 1000),
+        state: 'pending',
+      })
+      .onConflictDoNothing();
+    createdPeerIds.push(serverBPeerId);
+
+    const grant = await grantsService.createGrant({
+      subjectUserId: userId,
+      scope: { resources: ['tasks'], excluded_resources: [], max_rows_per_query: 100 },
+      peerId: serverBPeerId,
+    });
+    createdGrantIds.push(grant.id);
+    createdTokenGrantIds.push(grant.id);
+
+    const { token } = await enrollmentService.createToken({
+      grantId: grant.id,
+      peerId: serverBPeerId,
+      ttlSeconds: 900,
+    });
+
+    // ── Step B: "Server A" generates keypair ─────────────────────────────
+    const keypairRes = await agent
+      .post('/api/admin/federation/peers/keypair')
+      .send({
+        commonName: `e2e-peer-${RUN_ID.slice(0, 8)}`,
+        displayName: 'E2E Test Peer',
+        endpointUrl: 'https://test.invalid',
+      })
+      .set('Content-Type', 'application/json');
+
+    expect(keypairRes.status).toBe(201);
+    const { peerId, csrPem } = keypairRes.body as { peerId: string; csrPem: string };
+    expect(typeof peerId).toBe('string');
+    expect(csrPem).toContain('-----BEGIN CERTIFICATE REQUEST-----');
+    createdPeerIds.push(peerId);
+
+    // ── Step C: Enrollment (simulates Server A sending CSR to Server B) ──
+    const enrollRes = await agent
+      .post(`/api/federation/enrollment/${token}`)
+      .send({ csrPem })
+      .set('Content-Type', 'application/json');
+
+    expect(enrollRes.status).toBe(200);
+    const { certPem, certChainPem } = enrollRes.body as {
+      certPem: string;
+      certChainPem: string;
+    };
+    expect(certPem).toContain('-----BEGIN CERTIFICATE-----');
+    expect(certChainPem).toContain('-----BEGIN CERTIFICATE-----');
+
+    // ── Step D: "Server A" stores the cert ───────────────────────────────
+    const storeRes = await agent
+      .patch(`/api/admin/federation/peers/${peerId}/cert`)
+      .send({ certPem })
+      .set('Content-Type', 'application/json');
+
+    expect(storeRes.status).toBe(200);
+
+    // ── Step E: Verify peer record in DB ─────────────────────────────────
+    const [peer] = await db
+      .select()
+      .from(federationPeers)
+      .where(eq(federationPeers.id, peerId))
+      .limit(1);
+
+    expect(peer).toBeDefined();
+    expect(peer?.state).toBe('active');
+    expect(peer?.certPem).toContain('-----BEGIN CERTIFICATE-----');
+    expect(typeof peer?.certSerial).toBe('string');
+    expect((peer?.certSerial ?? '').length).toBeGreaterThan(0);
+    // clientKeyPem is a sealed ciphertext — must not be a raw PEM
+    expect(peer?.clientKeyPem?.startsWith('-----BEGIN')).toBe(false);
+    // certNotAfter must be in the future
+    expect(peer?.certNotAfter?.getTime()).toBeGreaterThan(Date.now());
+  }, 60_000);
+});

apps/gateway/src/__tests__/integration/federation-m2.integration.test.ts

@@ -0,0 +1,483 @@
+/**
+ * Federation M2 integration tests (FED-M2-09).
+ *
+ * Covers MILESTONES.md acceptance tests #1, #2, #3, #5, #7, #8.
+ *
+ * Prerequisites:
+ *   docker compose -f docker-compose.federated.yml --profile federated up -d
+ *
+ * Run DB-only tests (no Step-CA):
+ *   FEDERATED_INTEGRATION=1 BETTER_AUTH_SECRET=test-secret pnpm --filter @mosaicstack/gateway test \
+ *     src/__tests__/integration/federation-m2.integration.test.ts
+ *
+ * Run all tests including Step-CA-dependent ones:
+ *   FEDERATED_INTEGRATION=1 STEP_CA_AVAILABLE=1 \
+ *   STEP_CA_URL=https://localhost:9000 \
+ *   STEP_CA_PROVISIONER_KEY_JSON="$(docker exec $(docker ps -qf name=step-ca) cat /home/step/secrets/mosaic-fed.json)" \
+ *   STEP_CA_ROOT_CERT_PATH=/tmp/step-ca-root.crt \
+ *   pnpm --filter @mosaicstack/gateway test \
+ *     src/__tests__/integration/federation-m2.integration.test.ts
+ *
+ * Obtaining Step-CA credentials:
+ *   # Extract provisioner key from running container:
+ *   #   docker exec $(docker ps -qf name=step-ca) cat /home/step/secrets/mosaic-fed.json
+ *   # Copy root cert from container:
+ *   #   docker cp $(docker ps -qf name=step-ca):/home/step/certs/root_ca.crt /tmp/step-ca-root.crt
+ *   # Then: export STEP_CA_ROOT_CERT_PATH=/tmp/step-ca-root.crt
+ */
+
+import * as crypto from 'node:crypto';
+import { afterAll, beforeAll, describe, expect, it } from 'vitest';
+import { Test } from '@nestjs/testing';
+import { GoneException } from '@nestjs/common';
+import { Pkcs10CertificateRequestGenerator, X509Certificate as PeculiarX509 } from '@peculiar/x509';
+import {
+  createDb,
+  type Db,
+  type DbHandle,
+  federationPeers,
+  federationGrants,
+  federationEnrollmentTokens,
+  inArray,
+  eq,
+} from '@mosaicstack/db';
+import * as schema from '@mosaicstack/db';
+import { seal } from '@mosaicstack/auth';
+import { DB } from '../../database/database.module.js';
+import { GrantsService } from '../../federation/grants.service.js';
+import { EnrollmentService } from '../../federation/enrollment.service.js';
+import { CaService } from '../../federation/ca.service.js';
+import { FederationScopeError } from '../../federation/scope-schema.js';
+
+const run = process.env['FEDERATED_INTEGRATION'] === '1';
+const stepCaRun = run && process.env['STEP_CA_AVAILABLE'] === '1';
+
+const PG_URL = 'postgresql://mosaic:mosaic@localhost:5433/mosaic';
+
+// ---------------------------------------------------------------------------
+// Helpers for test data isolation
+// ---------------------------------------------------------------------------
+
+/** Unique run prefix to identify rows created by this test run. */
+const RUN_ID = crypto.randomUUID();
+
+/** Insert a minimal user row to satisfy the FK on federation_grants.subject_user_id. */
+async function insertTestUser(db: Db, id: string): Promise<void> {
+  await db
+    .insert(schema.users)
+    .values({
+      id,
+      name: `test-user-${id}`,
+      email: `test-${id}@federation-test.invalid`,
+      emailVerified: false,
+    })
+    .onConflictDoNothing();
+}
+
+/** Insert a minimal peer row to satisfy the FK on federation_grants.peer_id. */
+async function insertTestPeer(db: Db, id: string, suffix: string = ''): Promise<void> {
+  await db
+    .insert(federationPeers)
+    .values({
+      id,
+      commonName: `test-peer-${RUN_ID}-${suffix}`,
+      displayName: `Test Peer ${suffix}`,
+      certPem: '-----BEGIN CERTIFICATE-----\nMOCK\n-----END CERTIFICATE-----\n',
+      certSerial: `test-serial-${id}`,
+      certNotAfter: new Date(Date.now() + 365 * 24 * 60 * 60 * 1000),
+      state: 'pending',
+    })
+    .onConflictDoNothing();
+}
+
+// ---------------------------------------------------------------------------
+// DB-only test module (CaService mocked so env vars not required)
+// ---------------------------------------------------------------------------
+
+function buildDbModule(db: Db) {
+  return Test.createTestingModule({
+    providers: [
+      { provide: DB, useValue: db },
+      GrantsService,
+      {
+        provide: CaService,
+        useValue: {
+          issueCert: async () => {
+            throw new Error('CaService.issueCert should not be called in DB-only tests');
+          },
+        },
+      },
+      EnrollmentService,
+    ],
+  }).compile();
+}
+
+// ---------------------------------------------------------------------------
+// Test suite — DB-only (no Step-CA)
+// ---------------------------------------------------------------------------
+
+describe.skipIf(!run)('federation M2 — DB-only tests', () => {
+  let handle: DbHandle;
+  let db: Db;
+  let grantsService: GrantsService;
+
+  /** IDs created during this run — cleaned up in afterAll. */
+  const createdGrantIds: string[] = [];
+  const createdPeerIds: string[] = [];
+  const createdUserIds: string[] = [];
+
+  beforeAll(async () => {
+    process.env['BETTER_AUTH_SECRET'] ??= 'test-integration-sealing-key-not-for-prod';
+
+    handle = createDb(PG_URL);
+    db = handle.db;
+
+    const moduleRef = await buildDbModule(db);
+    grantsService = moduleRef.get(GrantsService);
+  });
+
+  afterAll(async () => {
+    // Clean up in FK-safe order: tokens → grants → peers → users
+    if (db && createdGrantIds.length > 0) {
+      await db
+        .delete(federationEnrollmentTokens)
+        .where(inArray(federationEnrollmentTokens.grantId, createdGrantIds))
+        .catch((e: unknown) => console.error('[federation-m2-test cleanup]', e));
+      await db
+        .delete(federationGrants)
+        .where(inArray(federationGrants.id, createdGrantIds))
+        .catch((e: unknown) => console.error('[federation-m2-test cleanup]', e));
+    }
+    if (db && createdPeerIds.length > 0) {
+      await db
+        .delete(federationPeers)
+        .where(inArray(federationPeers.id, createdPeerIds))
+        .catch((e: unknown) => console.error('[federation-m2-test cleanup]', e));
+    }
+    if (db && createdUserIds.length > 0) {
+      await db
+        .delete(schema.users)
+        .where(inArray(schema.users.id, createdUserIds))
+        .catch((e: unknown) => console.error('[federation-m2-test cleanup]', e));
+    }
+    if (handle)
+      await handle.close().catch((e: unknown) => console.error('[federation-m2-test cleanup]', e));
+  });
+
+  // -------------------------------------------------------------------------
+  // #1 — grant create writes a pending row
+  // -------------------------------------------------------------------------
+  it('#1 — createGrant writes a pending row to DB', async () => {
+    const userId = crypto.randomUUID();
+    const peerId = crypto.randomUUID();
+    const validScope = {
+      resources: ['tasks'],
+      excluded_resources: [],
+      max_rows_per_query: 100,
+    };
+
+    await insertTestUser(db, userId);
+    await insertTestPeer(db, peerId, 'test1');
+    createdUserIds.push(userId);
+    createdPeerIds.push(peerId);
+
+    const grant = await grantsService.createGrant({
+      subjectUserId: userId,
+      scope: validScope,
+      peerId,
+    });
+
+    createdGrantIds.push(grant.id);
+
+    // Verify the row exists in DB with correct shape
+    const [row] = await db
+      .select()
+      .from(federationGrants)
+      .where(eq(federationGrants.id, grant.id))
+      .limit(1);
+
+    expect(row).toBeDefined();
+    expect(row?.status).toBe('pending');
+    expect(row?.peerId).toBe(peerId);
+    expect(row?.subjectUserId).toBe(userId);
+    const storedScope = row?.scope as Record<string, unknown>;
+    expect(storedScope['resources']).toEqual(['tasks']);
+    expect(storedScope['max_rows_per_query']).toBe(100);
+  }, 15_000);
+
+  // -------------------------------------------------------------------------
+  // #7 — scope with unknown resource type rejected
+  // -------------------------------------------------------------------------
+  it('#7 — createGrant rejects scope with unknown resource type', async () => {
+    const userId = crypto.randomUUID();
+    const peerId = crypto.randomUUID();
+    const invalidScope = {
+      resources: ['totally_unknown_resource'],
+      excluded_resources: [],
+      max_rows_per_query: 100,
+    };
+
+    await insertTestUser(db, userId);
+    await insertTestPeer(db, peerId, 'test7');
+    createdUserIds.push(userId);
+    createdPeerIds.push(peerId);
+
+    await expect(
+      grantsService.createGrant({
+        subjectUserId: userId,
+        scope: invalidScope,
+        peerId,
+      }),
+    ).rejects.toThrow(FederationScopeError);
+  }, 15_000);
+
+  // -------------------------------------------------------------------------
+  // #8 — listGrants returns accurate status for grants in various states
+  // -------------------------------------------------------------------------
+  it('#8 — listGrants returns accurate status for grants in various states', async () => {
+    const userId = crypto.randomUUID();
+    const peerId = crypto.randomUUID();
+    const validScope = {
+      resources: ['notes'],
+      excluded_resources: [],
+      max_rows_per_query: 50,
+    };
+
+    await insertTestUser(db, userId);
+    await insertTestPeer(db, peerId, 'test8');
+    createdUserIds.push(userId);
+    createdPeerIds.push(peerId);
+
+    // Create two pending grants via GrantsService
+    const grantA = await grantsService.createGrant({
+      subjectUserId: userId,
+      scope: validScope,
+      peerId,
+    });
+    const grantB = await grantsService.createGrant({
+      subjectUserId: userId,
+      scope: { resources: ['tasks'], excluded_resources: [], max_rows_per_query: 50 },
+      peerId,
+    });
+    createdGrantIds.push(grantA.id, grantB.id);
+
+    // Insert a third grant directly in 'revoked' state to test status variety
+    const [grantC] = await db
+      .insert(federationGrants)
+      .values({
+        id: crypto.randomUUID(),
+        subjectUserId: userId,
+        peerId,
+        scope: validScope,
+        status: 'revoked',
+        revokedAt: new Date(),
+      })
+      .returning();
+    createdGrantIds.push(grantC!.id);
+
+    // List all grants for this peer
+    const allForPeer = await grantsService.listGrants({ peerId });
+
+    const ourGrantIds = new Set([grantA.id, grantB.id, grantC!.id]);
+    const ourGrants = allForPeer.filter((g) => ourGrantIds.has(g.id));
+    expect(ourGrants).toHaveLength(3);
+
+    const pendingGrants = ourGrants.filter((g) => g.status === 'pending');
+    const revokedGrants = ourGrants.filter((g) => g.status === 'revoked');
+    expect(pendingGrants).toHaveLength(2);
+    expect(revokedGrants).toHaveLength(1);
+
+    // Status-filtered query
+    const pendingOnly = await grantsService.listGrants({ peerId, status: 'pending' });
+    const ourPending = pendingOnly.filter((g) => ourGrantIds.has(g.id));
+    expect(ourPending.every((g) => g.status === 'pending')).toBe(true);
+
+    // Verify peer list from DB also shows the peer rows with correct state
+    const peers = await db.select().from(federationPeers).where(eq(federationPeers.id, peerId));
+    expect(peers).toHaveLength(1);
+    expect(peers[0]?.state).toBe('pending');
+  }, 15_000);
+
+  // -------------------------------------------------------------------------
+  // #5 — client_key_pem encrypted at rest
+  // -------------------------------------------------------------------------
+  it('#5 — clientKeyPem stored in DB is a sealed ciphertext (not a valid PEM)', async () => {
+    const peerId = crypto.randomUUID();
+    const rawPem = '-----BEGIN PRIVATE KEY-----\nMOCK\n-----END PRIVATE KEY-----\n';
+    const sealed = seal(rawPem);
+
+    await db.insert(federationPeers).values({
+      id: peerId,
+      commonName: `test-peer-${RUN_ID}-sealed`,
+      displayName: 'Sealed Key Test Peer',
+      certPem: '-----BEGIN CERTIFICATE-----\nMOCK\n-----END CERTIFICATE-----\n',
+      certSerial: `test-serial-sealed-${peerId}`,
+      certNotAfter: new Date(Date.now() + 365 * 24 * 60 * 60 * 1000),
+      state: 'pending',
+      clientKeyPem: sealed,
+    });
+    createdPeerIds.push(peerId);
+
+    const [row] = await db
+      .select()
+      .from(federationPeers)
+      .where(eq(federationPeers.id, peerId))
+      .limit(1);
+
+    expect(row).toBeDefined();
+    // The stored value must NOT be a valid PEM — it's a sealed ciphertext blob
+    expect(row?.clientKeyPem).toBeDefined();
+    expect(row?.clientKeyPem?.startsWith('-----BEGIN')).toBe(false);
+    // The sealed value should be non-trivial (at least 20 chars)
+    expect((row?.clientKeyPem ?? '').length).toBeGreaterThan(20);
+  }, 15_000);
+});
+
+// ---------------------------------------------------------------------------
+// Test suite — Step-CA gated
+// ---------------------------------------------------------------------------
+
+describe.skipIf(!stepCaRun)('federation M2 — Step-CA tests', () => {
+  let handle: DbHandle;
+  let db: Db;
+  let grantsService: GrantsService;
+  let enrollmentService: EnrollmentService;
+
+  const createdGrantIds: string[] = [];
+  const createdPeerIds: string[] = [];
+  const createdUserIds: string[] = [];
+
+  beforeAll(async () => {
+    handle = createDb(PG_URL);
+    db = handle.db;
+
+    // Use real CaService — env vars (STEP_CA_URL, STEP_CA_PROVISIONER_KEY_JSON,
+    // STEP_CA_ROOT_CERT_PATH) must be set when STEP_CA_AVAILABLE=1
+    const moduleRef = await Test.createTestingModule({
+      providers: [{ provide: DB, useValue: db }, CaService, GrantsService, EnrollmentService],
+    }).compile();
+
+    grantsService = moduleRef.get(GrantsService);
+    enrollmentService = moduleRef.get(EnrollmentService);
+  });
+
+  afterAll(async () => {
+    if (db && createdGrantIds.length > 0) {
+      await db
+        .delete(federationEnrollmentTokens)
+        .where(inArray(federationEnrollmentTokens.grantId, createdGrantIds))
+        .catch((e: unknown) => console.error('[federation-m2-test cleanup]', e));
+      await db
+        .delete(federationGrants)
+        .where(inArray(federationGrants.id, createdGrantIds))
+        .catch((e: unknown) => console.error('[federation-m2-test cleanup]', e));
+    }
+    if (db && createdPeerIds.length > 0) {
+      await db
+        .delete(federationPeers)
+        .where(inArray(federationPeers.id, createdPeerIds))
+        .catch((e: unknown) => console.error('[federation-m2-test cleanup]', e));
+    }
+    if (db && createdUserIds.length > 0) {
+      await db
+        .delete(schema.users)
+        .where(inArray(schema.users.id, createdUserIds))
+        .catch((e: unknown) => console.error('[federation-m2-test cleanup]', e));
+    }
+    if (handle)
+      await handle.close().catch((e: unknown) => console.error('[federation-m2-test cleanup]', e));
+  });
+
+  /** Generate a P-256 key pair and PKCS#10 CSR, returning the CSR as PEM. */
+  async function generateCsrPem(cn: string): Promise<string> {
+    const alg = { name: 'ECDSA', namedCurve: 'P-256', hash: 'SHA-256' };
+    const keyPair = await crypto.subtle.generateKey(alg, true, ['sign', 'verify']);
+    const csr = await Pkcs10CertificateRequestGenerator.create({
+      name: `CN=${cn}`,
+      keys: keyPair,
+      signingAlgorithm: alg,
+    });
+    return csr.toString('pem');
+  }
+
+  // -------------------------------------------------------------------------
+  // #2 — enrollment signs CSR and returns cert
+  // -------------------------------------------------------------------------
+  it('#2 — redeem returns a certPem containing a valid PEM certificate', async () => {
+    const userId = crypto.randomUUID();
+    const peerId = crypto.randomUUID();
+    const validScope = {
+      resources: ['tasks'],
+      excluded_resources: [],
+      max_rows_per_query: 100,
+    };
+
+    await insertTestUser(db, userId);
+    await insertTestPeer(db, peerId, 'ca-test2');
+    createdUserIds.push(userId);
+    createdPeerIds.push(peerId);
+
+    const grant = await grantsService.createGrant({
+      subjectUserId: userId,
+      scope: validScope,
+      peerId,
+    });
+    createdGrantIds.push(grant.id);
+
+    const { token } = await enrollmentService.createToken({
+      grantId: grant.id,
+      peerId,
+      ttlSeconds: 900,
+    });
+
+    const csrPem = await generateCsrPem(`gateway-test-${RUN_ID.slice(0, 8)}`);
+    const result = await enrollmentService.redeem(token, csrPem);
+
+    expect(result.certPem).toContain('-----BEGIN CERTIFICATE-----');
+    expect(result.certChainPem).toContain('-----BEGIN CERTIFICATE-----');
+
+    // Verify the issued cert parses cleanly
+    const cert = new PeculiarX509(result.certPem);
+    expect(cert.serialNumber).toBeTruthy();
+  }, 30_000);
+
+  // -------------------------------------------------------------------------
+  // #3 — token single-use; second attempt returns GoneException
+  // -------------------------------------------------------------------------
+  it('#3 — second redeem of the same token throws GoneException', async () => {
+    const userId = crypto.randomUUID();
+    const peerId = crypto.randomUUID();
+    const validScope = {
+      resources: ['notes'],
+      excluded_resources: [],
+      max_rows_per_query: 50,
+    };
+
+    await insertTestUser(db, userId);
+    await insertTestPeer(db, peerId, 'ca-test3');
+    createdUserIds.push(userId);
+    createdPeerIds.push(peerId);
+
+    const grant = await grantsService.createGrant({
+      subjectUserId: userId,
+      scope: validScope,
+      peerId,
+    });
+    createdGrantIds.push(grant.id);
+
+    const { token } = await enrollmentService.createToken({
+      grantId: grant.id,
+      peerId,
+      ttlSeconds: 900,
+    });
+
+    const csrPem = await generateCsrPem(`gateway-test-replay-${RUN_ID.slice(0, 8)}`);
+
+    // First redeem must succeed
+    const result = await enrollmentService.redeem(token, csrPem);
+    expect(result.certPem).toContain('-----BEGIN CERTIFICATE-----');
+
+    // Second redeem with the same token must be rejected
+    await expect(enrollmentService.redeem(token, csrPem)).rejects.toThrow(GoneException);
+  }, 30_000);
+});

apps/gateway/src/__tests__/integration/federation-m3-list.integration.test.ts

@@ -0,0 +1,519 @@
+/**
+ * Federation M3 single-gateway integration tests (FED-M3-10).
+ *
+ * Covers MILESTONES.md M3 acceptance:
+ *  - #6: malformed certificate OIDs fail with 401; valid cert + revoked grant fails with 403.
+ *  - #7: max_rows_per_query caps list results.
+ *
+ * Strategy:
+ *  - Real PostgreSQL via @mosaicstack/db.
+ *  - Mocked TLS context/Fastify request shim for FederationAuthGuard.
+ *  - Direct controller calls using the real POST /api/federation/v1/list/:resource contract.
+ *
+ * Run:
+ *   FEDERATED_INTEGRATION=1 pnpm --filter @mosaicstack/gateway test -- \
+ *     src/__tests__/integration/federation-m3-list.integration.test.ts
+ */
+
+import 'reflect-metadata';
+import * as crypto from 'node:crypto';
+import type { ExecutionContext } from '@nestjs/common';
+import { Test, type TestingModule } from '@nestjs/testing';
+import type { FastifyReply, FastifyRequest } from 'fastify';
+import {
+  and,
+  createDb,
+  eq,
+  federationGrants,
+  federationPeers,
+  inArray,
+  missionTasks,
+  missions,
+  projects,
+  tasks,
+  teamMembers,
+  teams,
+  type Db,
+  type DbHandle,
+  users,
+} from '@mosaicstack/db';
+import { afterAll, beforeAll, describe, expect, it } from 'vitest';
+import { DB } from '../../database/database.module.js';
+import { GrantsService } from '../../federation/grants.service.js';
+import { FederationAuthGuard } from '../../federation/server/federation-auth.guard.js';
+import { FederationScopeService } from '../../federation/server/scope.service.js';
+import { FederationListQueryService } from '../../federation/server/verbs/list-query.service.js';
+import { ListController } from '../../federation/server/verbs/list.controller.js';
+import {
+  makeMosaicIssuedCert,
+  makeSelfSignedCert,
+} from '../../federation/__tests__/helpers/test-cert.js';
+
+const run = process.env['FEDERATED_INTEGRATION'] === '1';
+const PG_URL = process.env['DATABASE_URL'] ?? 'postgresql://mosaic:mosaic@localhost:5433/mosaic';
+const RUN_ID = `fed-m3-10-${crypto.randomUUID()}`;
+const CERT_SERIAL_HEX = crypto.randomUUID().replace(/-/g, '').toUpperCase();
+
+interface TestIds {
+  readonly subjectUserId: string;
+  readonly otherUserId: string;
+  readonly peerId: string;
+  readonly revokedPeerId: string;
+  readonly activeGrantId: string;
+  readonly revokedGrantId: string;
+  readonly subjectProjectId: string;
+  readonly subjectMissionId: string;
+  readonly otherProjectId: string;
+  readonly teamId: string;
+  readonly unauthorizedTeamId: string;
+  readonly teamProjectId: string;
+  readonly taskIds: readonly string[];
+  readonly excludedTaskIds: readonly string[];
+  readonly subjectNoteId: string;
+  readonly otherUserNoteId: string;
+}
+
+function pemToDer(pem: string): Buffer {
+  return Buffer.from(
+    pem
+      .replace(/-----BEGIN CERTIFICATE-----/, '')
+      .replace(/-----END CERTIFICATE-----/, '')
+      .replace(/\s+/g, ''),
+    'base64',
+  );
+}
+
+function makeFederationRequest(certPem: string): FastifyRequest {
+  return {
+    raw: {
+      socket: {
+        getPeerCertificate: () => ({
+          raw: pemToDer(certPem),
+          serialNumber: CERT_SERIAL_HEX,
+        }),
+      },
+    },
+  } as unknown as FastifyRequest;
+}
+
+function makeGuardContext(request: FastifyRequest): {
+  readonly context: ExecutionContext;
+  readonly sent: { statusCode?: number; payload?: unknown };
+} {
+  const sent: { statusCode?: number; payload?: unknown } = {};
+  const reply = {
+    status: (statusCode: number) => {
+      sent.statusCode = statusCode;
+      return {
+        header: () => ({
+          send: (payload: unknown) => {
+            sent.payload = payload;
+          },
+        }),
+      };
+    },
+  } as unknown as FastifyReply;
+
+  const context = {
+    switchToHttp: () => ({
+      getRequest: () => request,
+      getResponse: () => reply,
+    }),
+  } as unknown as ExecutionContext;
+
+  return { context, sent };
+}
+
+async function insertUser(db: Db, id: string, label: string): Promise<void> {
+  await db.insert(users).values({
+    id,
+    name: `${RUN_ID}-${label}`,
+    email: `${RUN_ID}-${label}@federation-test.invalid`,
+    emailVerified: false,
+  });
+}
+
+async function seedFixtures(db: Db): Promise<TestIds> {
+  const subjectUserId = `${RUN_ID}-subject`;
+  const otherUserId = `${RUN_ID}-other`;
+  const peerId = crypto.randomUUID();
+  const revokedPeerId = crypto.randomUUID();
+  const activeGrantId = crypto.randomUUID();
+  const revokedGrantId = crypto.randomUUID();
+  const subjectProjectId = crypto.randomUUID();
+  const subjectMissionId = crypto.randomUUID();
+  const otherProjectId = crypto.randomUUID();
+  const teamId = crypto.randomUUID();
+  const unauthorizedTeamId = crypto.randomUUID();
+  const teamProjectId = crypto.randomUUID();
+  const taskIds = [crypto.randomUUID(), crypto.randomUUID(), crypto.randomUUID()] as const;
+  const excludedTaskIds = [crypto.randomUUID(), crypto.randomUUID()] as const;
+  const subjectNoteId = crypto.randomUUID();
+  const otherUserNoteId = crypto.randomUUID();
+
+  await insertUser(db, subjectUserId, 'subject');
+  await insertUser(db, otherUserId, 'other');
+
+  await db.insert(teams).values([
+    {
+      id: teamId,
+      name: `${RUN_ID} allowed team`,
+      slug: `${RUN_ID}-allowed-team`,
+      ownerId: subjectUserId,
+      managerId: subjectUserId,
+    },
+    {
+      id: unauthorizedTeamId,
+      name: `${RUN_ID} unauthorized team`,
+      slug: `${RUN_ID}-unauthorized-team`,
+      ownerId: otherUserId,
+      managerId: otherUserId,
+    },
+  ]);
+
+  await db.insert(teamMembers).values([
+    { teamId, userId: subjectUserId, role: 'member' },
+    { teamId: unauthorizedTeamId, userId: subjectUserId, role: 'member' },
+  ]);
+
+  await db.insert(projects).values([
+    {
+      id: subjectProjectId,
+      name: `${RUN_ID} subject personal project`,
+      ownerType: 'user',
+      ownerId: subjectUserId,
+    },
+    {
+      id: otherProjectId,
+      name: `${RUN_ID} other personal project`,
+      ownerType: 'user',
+      ownerId: otherUserId,
+    },
+    {
+      id: teamProjectId,
+      name: `${RUN_ID} unauthorized team project`,
+      ownerType: 'team',
+      teamId: unauthorizedTeamId,
+    },
+  ]);
+
+  await db.insert(missions).values({
+    id: subjectMissionId,
+    name: `${RUN_ID} subject mission`,
+    projectId: subjectProjectId,
+    userId: subjectUserId,
+  });
+
+  await db.insert(tasks).values([
+    {
+      id: taskIds[0],
+      title: `${RUN_ID} visible task 1`,
+      missionId: subjectMissionId,
+      createdAt: new Date('2026-06-25T03:00:00.000Z'),
+      updatedAt: new Date('2026-06-25T03:00:00.000Z'),
+    },
+    {
+      id: taskIds[1],
+      title: `${RUN_ID} visible task 2`,
+      projectId: subjectProjectId,
+      createdAt: new Date('2026-06-25T02:00:00.000Z'),
+      updatedAt: new Date('2026-06-25T02:00:00.000Z'),
+    },
+    {
+      id: taskIds[2],
+      title: `${RUN_ID} visible task 3`,
+      projectId: subjectProjectId,
+      createdAt: new Date('2026-06-25T01:00:00.000Z'),
+      updatedAt: new Date('2026-06-25T01:00:00.000Z'),
+    },
+    {
+      id: excludedTaskIds[0],
+      title: `${RUN_ID} other user task`,
+      projectId: otherProjectId,
+      createdAt: new Date('2026-06-25T04:00:00.000Z'),
+      updatedAt: new Date('2026-06-25T04:00:00.000Z'),
+    },
+    {
+      id: excludedTaskIds[1],
+      title: `${RUN_ID} unauthorized team task`,
+      projectId: teamProjectId,
+      createdAt: new Date('2026-06-25T05:00:00.000Z'),
+      updatedAt: new Date('2026-06-25T05:00:00.000Z'),
+    },
+  ]);
+
+  await db.insert(missionTasks).values([
+    {
+      id: subjectNoteId,
+      missionId: subjectMissionId,
+      userId: subjectUserId,
+      notes: `${RUN_ID} subject visible note`,
+      createdAt: new Date('2026-06-25T03:30:00.000Z'),
+      updatedAt: new Date('2026-06-25T03:30:00.000Z'),
+    },
+    {
+      id: otherUserNoteId,
+      missionId: subjectMissionId,
+      userId: otherUserId,
+      notes: `${RUN_ID} other user note on subject mission`,
+      createdAt: new Date('2026-06-25T04:30:00.000Z'),
+      updatedAt: new Date('2026-06-25T04:30:00.000Z'),
+    },
+  ]);
+
+  await db.insert(federationPeers).values([
+    {
+      id: peerId,
+      commonName: `${RUN_ID}-active-peer`,
+      displayName: `${RUN_ID} Active Peer`,
+      certPem: '-----BEGIN CERTIFICATE-----\nMOCK\n-----END CERTIFICATE-----\n',
+      certSerial: CERT_SERIAL_HEX,
+      certNotAfter: new Date(Date.now() + 86_400_000),
+      state: 'active',
+    },
+    {
+      id: revokedPeerId,
+      commonName: `${RUN_ID}-revoked-peer`,
+      displayName: `${RUN_ID} Revoked Peer`,
+      certPem: '-----BEGIN CERTIFICATE-----\nMOCK\n-----END CERTIFICATE-----\n',
+      certSerial: `${CERT_SERIAL_HEX}${RUN_ID.replace(/-/g, '').slice(0, 8).toUpperCase()}`,
+      certNotAfter: new Date(Date.now() + 86_400_000),
+      state: 'active',
+    },
+  ]);
+
+  await db.insert(federationGrants).values([
+    {
+      id: activeGrantId,
+      peerId,
+      subjectUserId,
+      status: 'active',
+      scope: {
+        resources: ['tasks', 'notes'],
+        excluded_resources: [],
+        filters: {
+          tasks: { include_personal: true, include_teams: [] },
+          notes: { include_personal: true, include_teams: [] },
+        },
+        max_rows_per_query: 2,
+      },
+    },
+    {
+      id: revokedGrantId,
+      peerId,
+      subjectUserId,
+      status: 'revoked',
+      revokedAt: new Date(),
+      revokedReason: `${RUN_ID} revoked grant fixture`,
+      scope: {
+        resources: ['tasks'],
+        excluded_resources: [],
+        max_rows_per_query: 2,
+      },
+    },
+  ]);
+
+  return {
+    subjectUserId,
+    otherUserId,
+    peerId,
+    revokedPeerId,
+    activeGrantId,
+    revokedGrantId,
+    subjectProjectId,
+    subjectMissionId,
+    otherProjectId,
+    teamId,
+    unauthorizedTeamId,
+    teamProjectId,
+    taskIds,
+    excludedTaskIds,
+    subjectNoteId,
+    otherUserNoteId,
+  };
+}
+
+async function cleanupFixtures(db: Db, ids: TestIds | undefined): Promise<void> {
+  if (!ids) {
+    return;
+  }
+
+  await db
+    .delete(missionTasks)
+    .where(inArray(missionTasks.id, [ids.subjectNoteId, ids.otherUserNoteId]))
+    .catch(() => {});
+  await db
+    .delete(tasks)
+    .where(inArray(tasks.id, [...ids.taskIds, ...ids.excludedTaskIds]))
+    .catch(() => {});
+  await db
+    .delete(missions)
+    .where(eq(missions.id, ids.subjectMissionId))
+    .catch(() => {});
+  await db
+    .delete(projects)
+    .where(inArray(projects.id, [ids.subjectProjectId, ids.otherProjectId, ids.teamProjectId]))
+    .catch(() => {});
+  await db
+    .delete(teamMembers)
+    .where(
+      and(
+        eq(teamMembers.userId, ids.subjectUserId),
+        inArray(teamMembers.teamId, [ids.teamId, ids.unauthorizedTeamId]),
+      ),
+    )
+    .catch(() => {});
+  await db
+    .delete(teams)
+    .where(inArray(teams.id, [ids.teamId, ids.unauthorizedTeamId]))
+    .catch(() => {});
+  await db
+    .delete(federationGrants)
+    .where(inArray(federationGrants.id, [ids.activeGrantId, ids.revokedGrantId]))
+    .catch(() => {});
+  await db
+    .delete(federationPeers)
+    .where(inArray(federationPeers.id, [ids.peerId, ids.revokedPeerId]))
+    .catch(() => {});
+  await db
+    .delete(users)
+    .where(inArray(users.id, [ids.subjectUserId, ids.otherUserId]))
+    .catch(() => {});
+}
+
+describe.skipIf(!run)('federation M3 list verb — single-gateway integration', () => {
+  let handle: DbHandle;
+  let db: Db;
+  let moduleRef: TestingModule;
+  let guard: FederationAuthGuard;
+  let listController: ListController;
+  let ids: TestIds | undefined;
+
+  beforeAll(async () => {
+    handle = createDb(PG_URL);
+    db = handle.db;
+    ids = await seedFixtures(db);
+
+    moduleRef = await Test.createTestingModule({
+      controllers: [ListController],
+      providers: [
+        { provide: DB, useValue: db },
+        GrantsService,
+        FederationAuthGuard,
+        FederationScopeService,
+        FederationListQueryService,
+      ],
+    }).compile();
+
+    guard = moduleRef.get(FederationAuthGuard);
+    listController = moduleRef.get(ListController);
+  }, 30_000);
+
+  afterAll(async () => {
+    await moduleRef?.close().catch((e: unknown) => console.error('[fed-m3-10 cleanup]', e));
+    await cleanupFixtures(db, ids).catch((e: unknown) => console.error('[fed-m3-10 cleanup]', e));
+    await handle?.close().catch((e: unknown) => console.error('[fed-m3-10 cleanup]', e));
+  });
+
+  it('#6 — rejects a client cert with malformed/missing Mosaic OIDs with 401', async () => {
+    const malformedOidCert = await makeSelfSignedCert();
+    const request = makeFederationRequest(malformedOidCert);
+    const { context, sent } = makeGuardContext(request);
+
+    await expect(guard.canActivate(context)).resolves.toBe(false);
+    expect(sent.statusCode).toBe(401);
+    expect(sent.payload).toMatchObject({
+      error: {
+        code: 'unauthorized',
+        message: expect.stringContaining('missing required OID'),
+      },
+    });
+    expect(request.federationContext).toBeUndefined();
+  });
+
+  it('#6 — rejects a valid client cert when its grant is revoked with 403', async () => {
+    expect(ids).toBeDefined();
+    const revokedCert = await makeMosaicIssuedCert({
+      grantId: ids!.revokedGrantId,
+      subjectUserId: ids!.subjectUserId,
+    });
+    const request = makeFederationRequest(revokedCert);
+    const { context, sent } = makeGuardContext(request);
+
+    await expect(guard.canActivate(context)).resolves.toBe(false);
+    expect(sent.statusCode).toBe(403);
+    expect(sent.payload).toMatchObject({
+      error: {
+        code: 'forbidden',
+        message: 'Federation access denied',
+      },
+    });
+    expect(request.federationContext).toBeUndefined();
+  });
+
+  it('#7 — enforces max_rows_per_query on POST /api/federation/v1/list/:resource', async () => {
+    expect(ids).toBeDefined();
+    const activeCert = await makeMosaicIssuedCert({
+      grantId: ids!.activeGrantId,
+      subjectUserId: ids!.subjectUserId,
+    });
+    const request = makeFederationRequest(activeCert);
+    const { context } = makeGuardContext(request);
+
+    await expect(guard.canActivate(context)).resolves.toBe(true);
+
+    const response = await listController.list('tasks', request, { limit: 100 });
+    const returnedIds = response.items.map((item) => item['id']);
+
+    expect(response.items).toHaveLength(2);
+    expect(response._truncated).toBe(true);
+    expect(response.nextCursor).toEqual(expect.any(String));
+    expect(returnedIds).toEqual([ids!.taskIds[0], ids!.taskIds[1]]);
+    expect(returnedIds).not.toContain(ids!.taskIds[2]);
+    for (const excludedId of ids!.excludedTaskIds) {
+      expect(returnedIds).not.toContain(excludedId);
+    }
+    expect(response.items.every((item) => item._source === 'local')).toBe(true);
+  });
+
+  it('excludes another user mission task notes on the same authorized mission', async () => {
+    expect(ids).toBeDefined();
+    const activeCert = await makeMosaicIssuedCert({
+      grantId: ids!.activeGrantId,
+      subjectUserId: ids!.subjectUserId,
+    });
+    const request = makeFederationRequest(activeCert);
+    const { context } = makeGuardContext(request);
+
+    await expect(guard.canActivate(context)).resolves.toBe(true);
+
+    const response = await listController.list('notes', request, { limit: 10 });
+    const returnedIds = response.items.map((item) => item['id']);
+
+    expect(returnedIds).toEqual([ids!.subjectNoteId]);
+    expect(returnedIds).not.toContain(ids!.otherUserNoteId);
+    expect(response.items.every((item) => item._source === 'local')).toBe(true);
+  });
+
+  it('fails closed for unsupported list resources', async () => {
+    expect(ids).toBeDefined();
+    const activeCert = await makeMosaicIssuedCert({
+      grantId: ids!.activeGrantId,
+      subjectUserId: ids!.subjectUserId,
+    });
+    const request = makeFederationRequest(activeCert);
+    const { context } = makeGuardContext(request);
+
+    await expect(guard.canActivate(context)).resolves.toBe(true);
+
+    await expect(listController.list('widgets', request, {})).rejects.toMatchObject({
+      response: {
+        error: {
+          code: 'scope_violation',
+          message: 'Requested federation resource is not supported',
+        },
+      },
+      status: 403,
+    });
+  });
+});

apps/gateway/src/__tests__/integration/tess-cross-surface.integration.test.ts

@@ -0,0 +1,213 @@
+import { afterEach, describe, expect, it, vi } from 'vitest';
+import { InMemoryDurableSessionStore } from '@mosaicstack/agent';
+import {
+  createDiscordIngressEnvelope,
+  DiscordPlugin,
+  type DiscordIngressPayload,
+} from '@mosaicstack/discord-plugin';
+import { InteractionController } from '../../agent/interaction.controller.js';
+import { RuntimeProviderService } from '../../agent/runtime-provider-registry.service.js';
+import { DurableSessionService } from '../../agent/durable-session.service.js';
+import { ChatGateway } from '../../chat/chat.gateway.js';
+import { CommandAuthorizationService } from '../../commands/command-authorization.service.js';
+
+const SERVICE_TOKEN = 'test-discord-service-token';
+const envKeys = [
+  'DISCORD_SERVICE_TOKEN',
+  'DISCORD_SERVICE_TENANT_ID',
+  'DISCORD_INTERACTION_BINDINGS',
+  'DISCORD_ALLOWED_GUILD_IDS',
+  'DISCORD_ALLOWED_CHANNEL_IDS',
+  'DISCORD_ALLOWED_USER_IDS',
+  'MOSAIC_AGENT_NAME',
+] as const;
+const priorEnv = new Map<string, string | undefined>();
+
+function payload(content: string, messageId: string, correlationId: string): DiscordIngressPayload {
+  return {
+    content,
+    messageId,
+    correlationId,
+    guildId: 'guild-1',
+    channelId: 'channel-1',
+    userId: 'discord-admin-1',
+    conversationId: 'Nova:discord:channel-1',
+  };
+}
+
+/**
+ * The chat runtime router must never be exercised on the Discord approval/stop control paths —
+ * those paths run entirely through the command-authorization, runtime-provider and durable-session
+ * dependencies. Placed in the gateway's chat-runtime-router slot (the former direct `AgentService`
+ * slot) so any accidental chat-runtime dispatch throws loudly instead of silently passing. Because
+ * approval/stop never resolve a chat runtime, this fixture is never triggered and the integration
+ * stays a GREEN cross-surface control.
+ */
+function failIfUsedChatRuntimeRouter() {
+  return {
+    onModuleInit: () => {
+      throw new Error('chat runtime router must not initialise on the Discord control path');
+    },
+    get active(): never {
+      throw new Error('chat runtime must not be resolved on the Discord approval/stop path');
+    },
+  };
+}
+
+function authorization(): CommandAuthorizationService {
+  const entries = new Map<string, string>();
+  return new CommandAuthorizationService(
+    {
+      select: () => ({
+        from: () => ({ where: () => ({ limit: async () => [{ role: 'admin' }] }) }),
+      }),
+    } as never,
+    {
+      get: async (key: string) => entries.get(key) ?? null,
+      set: async (key: string, value: string) => entries.set(key, value),
+      del: async (key: string) => Number(entries.delete(key)),
+    },
+  );
+}
+
+describe('interaction Discord/CLI durable-session integration', () => {
+  afterEach(() => {
+    for (const key of envKeys) {
+      const value = priorEnv.get(key);
+      if (value === undefined) delete process.env[key];
+      else process.env[key] = value;
+    }
+    priorEnv.clear();
+  });
+
+  it('enrolls through the CLI surface then resolves the same durable session from Discord', async () => {
+    for (const key of envKeys) priorEnv.set(key, process.env[key]);
+    process.env['MOSAIC_AGENT_NAME'] = 'Nova';
+    process.env['DISCORD_SERVICE_TOKEN'] = SERVICE_TOKEN;
+    process.env['DISCORD_SERVICE_TENANT_ID'] = 'tenant-1';
+    process.env['DISCORD_ALLOWED_GUILD_IDS'] = 'guild-1';
+    process.env['DISCORD_ALLOWED_CHANNEL_IDS'] = 'channel-1';
+    process.env['DISCORD_ALLOWED_USER_IDS'] = 'discord-admin-1';
+    process.env['DISCORD_INTERACTION_BINDINGS'] = JSON.stringify([
+      {
+        instanceId: 'Nova',
+        agentConfigId: 'agent-config-nova',
+        guildId: 'guild-1',
+        channelId: 'channel-1',
+        pairedUsers: {
+          'discord-admin-1': { role: 'admin', mosaicUserId: 'mosaic-admin-1' },
+        },
+      },
+    ]);
+
+    const durable = new DurableSessionService(
+      new InMemoryDurableSessionStore() as never,
+      {} as never,
+    );
+    const enrollmentRuntime = {
+      listSessions: vi.fn().mockResolvedValue([{ id: 'runtime-1' }]),
+    };
+    const controller = new InteractionController(enrollmentRuntime as never, durable);
+    await controller.enroll(
+      'Nova',
+      'Nova:discord:channel-1',
+      { providerId: 'fleet', runtimeSessionId: 'runtime-1' },
+      { id: 'mosaic-admin-1', tenantId: 'tenant-1' },
+      'cli-enrollment-correlation',
+    );
+
+    const authz = authorization();
+    const terminated = vi.fn().mockResolvedValue(undefined);
+    const runtime = new RuntimeProviderService(
+      {
+        require: () => ({
+          capabilities: async () => ({ supported: ['session.terminate'] }),
+          terminate: terminated,
+        }),
+      } as never,
+      { record: async () => undefined } as never,
+      {
+        consume: (approvalId, action) =>
+          authz.consumeRuntimeTerminationApproval(approvalId, action),
+      },
+    );
+    const gateway = new ChatGateway(
+      failIfUsedChatRuntimeRouter() as never,
+      {} as never,
+      {} as never,
+      {} as never,
+      {} as never,
+      {} as never,
+      authz,
+      runtime,
+      durable,
+    );
+    const client = { data: { discordService: true }, emit: vi.fn() };
+    const plugin = new DiscordPlugin({
+      token: 'unused',
+      gatewayUrl: 'http://unused',
+      serviceToken: SERVICE_TOKEN,
+      allowedGuildIds: ['guild-1'],
+      allowedChannelIds: ['channel-1'],
+      allowedUserIds: ['discord-admin-1'],
+      interactionBindings: [
+        {
+          instanceId: 'Nova',
+          agentConfigId: 'agent-config-nova',
+          guildId: 'guild-1',
+          channelId: 'channel-1',
+          pairedUsers: {
+            'discord-admin-1': { role: 'admin', mosaicUserId: 'mosaic-admin-1' },
+          },
+        },
+      ],
+    });
+    const pluginInternals = plugin as unknown as {
+      client: { user: { id: string } };
+      socket: { connected: boolean; emit: ReturnType<typeof vi.fn> };
+      handleDiscordMessage(message: unknown): void;
+    };
+    const pluginSocket = { connected: true, emit: vi.fn() };
+    pluginInternals.client = { user: { id: 'bot-1' } };
+    pluginInternals.socket = pluginSocket;
+    pluginInternals.handleDiscordMessage({
+      id: 'approve-1',
+      guildId: 'guild-1',
+      channelId: 'channel-1',
+      author: { id: 'discord-admin-1', bot: false },
+      mentions: { has: () => true },
+      content: '<@bot-1> /approve',
+      channel: { parentId: null },
+      attachments: new Map(),
+    });
+
+    expect(pluginSocket.emit).toHaveBeenCalledWith('discord:approve', expect.any(Object));
+    const approvalEnvelope = pluginSocket.emit.mock.calls[0]?.[1];
+    await gateway.handleDiscordApproval(client as never, approvalEnvelope);
+    const approval = client.emit.mock.calls.find(
+      ([event]) => event === 'discord:approval',
+    )?.[1] as {
+      approvalId: string;
+      success: boolean;
+    };
+    expect(approval.success).toBe(true);
+
+    await gateway.handleDiscordStop(
+      client as never,
+      createDiscordIngressEnvelope(
+        payload(`/stop ${approval.approvalId}`, 'stop-1', 'discord-stop-correlation'),
+        SERVICE_TOKEN,
+      ),
+    );
+
+    expect(terminated).toHaveBeenCalledWith(
+      'runtime-1',
+      approval.approvalId,
+      expect.objectContaining({ actorId: 'mosaic-admin-1' }),
+    );
+    expect(client.emit).toHaveBeenCalledWith('discord:stop', {
+      correlationId: 'discord-stop-correlation',
+      success: true,
+    });
+  });
+});

apps/gateway/src/__tests__/resource-ownership.test.ts

@@ -60,7 +60,7 @@ describe('Resource ownership checks', () => {
     // The repo enforces ownership via the WHERE clause; it returns undefined when the
     // conversation does not belong to the requesting user.
     brain.conversations.findById.mockResolvedValue(undefined);
-    const controller = new ConversationsController(brain as never);
+    const controller = new ConversationsController(brain as never, { runtimeMode: 'legacy' });
 
     await expect(controller.findOne('conv-1', { id: 'user-1' })).rejects.toBeInstanceOf(
       NotFoundException,

apps/gateway/src/admin/admin-health.controller.ts

@@ -1,9 +1,11 @@
-import { Controller, Get, Inject, UseGuards } from '@nestjs/common';
+import { Controller, Get, Inject, Optional, UseGuards } from '@nestjs/common';
 import { sql, type Db } from '@mosaicstack/db';
 import { createQueue } from '@mosaicstack/queue';
+import type { MosaicConfig } from '@mosaicstack/config';
 import { DB } from '../database/database.module.js';
 import { AgentService } from '../agent/agent.service.js';
 import { ProviderService } from '../agent/provider.service.js';
+import { MOSAIC_CONFIG } from '../config/config.module.js';
 import { AdminGuard } from './admin.guard.js';
 import type { HealthStatusDto, ServiceStatusDto } from './admin.dto.js';
 
@@ -14,13 +16,16 @@ export class AdminHealthController {
     @Inject(DB) private readonly db: Db,
     @Inject(AgentService) private readonly agentService: AgentService,
     @Inject(ProviderService) private readonly providerService: ProviderService,
+    @Optional()
+    @Inject(MOSAIC_CONFIG)
+    private readonly mosaicConfig: MosaicConfig | null,
   ) {}
 
   @Get()
   async check(): Promise<HealthStatusDto> {
     const [database, cache] = await Promise.all([this.checkDatabase(), this.checkCache()]);
 
-    const sessions = this.agentService.listSessions();
+    const sessions = this.agentService.listAllSessionsForSystem();
     const providers = this.providerService.listProviders();
 
     const allOk = database.status === 'ok' && cache.status === 'ok';
@@ -55,6 +60,14 @@ export class AdminHealthController {
   }
 
   private async checkCache(): Promise<ServiceStatusDto> {
+    // On Local tier there is no Redis. The cache is intentionally absent, which
+    // is a healthy state for this tier — report 'ok' rather than opening a new
+    // ioredis connection on every admin health check (which would spam
+    // ECONNREFUSED and create/destroy a connection per request). latencyMs 0
+    // signals "no cache backend to measure" for this tier.
+    if (this.mosaicConfig?.queue?.type === 'local') {
+      return { status: 'ok', latencyMs: 0 };
+    }
     const start = Date.now();
     const handle = createQueue();
     try {

apps/gateway/src/agent/__tests__/agent-service-ownership.test.ts

@@ -0,0 +1,191 @@
+import { ForbiddenException } from '@nestjs/common';
+import { describe, expect, it, vi } from 'vitest';
+import { AgentService, type AgentSession } from '../agent.service.js';
+import type { ActorTenantScope } from '../../auth/session-scope.js';
+
+const CONVERSATION_ID = '22222222-2222-4222-8222-222222222222';
+const OWNER_SCOPE: ActorTenantScope = { userId: 'owner-user', tenantId: 'owner-tenant' };
+const FOREIGN_SCOPE: ActorTenantScope = { userId: 'foreign-user', tenantId: 'foreign-tenant' };
+
+type AgentServiceInternals = {
+  sessions: Map<string, AgentSession>;
+  creating: Map<string, Promise<AgentSession>>;
+};
+
+function makeService(operatorMemory: unknown = null): AgentService {
+  return new AgentService(
+    {
+      getDefaultModel: vi.fn(() => null),
+      getRegistry: vi.fn(() => ({})),
+      findModel: vi.fn(),
+      listAvailableModels: vi.fn(() => []),
+    } as never,
+    {} as never,
+    {} as never,
+    { available: false } as never,
+    {} as never,
+    { getToolDefinitions: vi.fn(() => []) } as never,
+    { loadForSession: vi.fn(async () => ({ metaTools: [], promptAdditions: [] })) } as never,
+    null,
+    null,
+    { collect: vi.fn().mockResolvedValue(undefined) } as never,
+    operatorMemory as never,
+  );
+}
+
+function internals(service: AgentService): AgentServiceInternals {
+  return service as unknown as AgentServiceInternals;
+}
+
+function makeSession(scope: ActorTenantScope = OWNER_SCOPE): AgentSession {
+  return {
+    id: CONVERSATION_ID,
+    provider: 'test-provider',
+    modelId: 'test-model',
+    piSession: {
+      thinkingLevel: 'off',
+      getAvailableThinkingLevels: vi.fn().mockReturnValue(['off', 'low', 'high']),
+      setThinkingLevel: vi.fn(),
+      abort: vi.fn().mockResolvedValue(undefined),
+      prompt: vi.fn().mockResolvedValue(undefined),
+      dispose: vi.fn(),
+      getSessionStats: vi.fn(),
+      getContextUsage: vi.fn(),
+    } as unknown as AgentSession['piSession'],
+    listeners: new Set(),
+    unsubscribe: vi.fn(),
+    createdAt: Date.now(),
+    promptCount: 0,
+    channels: new Set(),
+    skillPromptAdditions: [],
+    sandboxDir: '/tmp/tess-session-ownership-test',
+    allowedTools: null,
+    userId: scope.userId,
+    tenantId: scope.tenantId,
+    metrics: {
+      tokens: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0, total: 0 },
+      modelSwitches: 0,
+      messageCount: 0,
+      lastActivityAt: new Date('2026-07-12T00:00:00Z').toISOString(),
+    },
+  };
+}
+
+describe('AgentService owner/tenant scope enforcement', () => {
+  it('allows owner-scoped operations and rejects foreign scopes for seeded sessions', async () => {
+    const service = makeService();
+    const session = makeSession();
+    internals(service).sessions.set(CONVERSATION_ID, session);
+
+    expect(service.getSession(CONVERSATION_ID, OWNER_SCOPE)).toBe(session);
+    expect(service.getSession(CONVERSATION_ID, FOREIGN_SCOPE)).toBeUndefined();
+    expect(service.getSessionInfo(CONVERSATION_ID, FOREIGN_SCOPE)).toBeUndefined();
+    expect(service.listSessions(OWNER_SCOPE)).toHaveLength(1);
+    expect(service.listSessions(FOREIGN_SCOPE)).toEqual([]);
+
+    service.addChannel(CONVERSATION_ID, 'websocket:owner', OWNER_SCOPE);
+    expect(session.channels.has('websocket:owner')).toBe(true);
+    expect(() => service.addChannel(CONVERSATION_ID, 'websocket:foreign', FOREIGN_SCOPE)).toThrow(
+      ForbiddenException,
+    );
+    expect(() => service.removeChannel(CONVERSATION_ID, 'websocket:owner', FOREIGN_SCOPE)).toThrow(
+      ForbiddenException,
+    );
+
+    expect(() =>
+      service.updateSessionModel(CONVERSATION_ID, 'foreign-model', FOREIGN_SCOPE),
+    ).toThrow(ForbiddenException);
+    service.updateSessionModel(CONVERSATION_ID, 'owner-model', OWNER_SCOPE);
+    expect(session.modelId).toBe('owner-model');
+
+    expect(() =>
+      service.applyAgentConfig(CONVERSATION_ID, 'agent-foreign', 'Foreign Agent', FOREIGN_SCOPE),
+    ).toThrow(ForbiddenException);
+    service.applyAgentConfig(CONVERSATION_ID, 'agent-owner', 'Owner Agent', OWNER_SCOPE);
+    expect(session.agentConfigId).toBe('agent-owner');
+
+    expect(() => service.onEvent(CONVERSATION_ID, vi.fn(), FOREIGN_SCOPE)).toThrow(
+      ForbiddenException,
+    );
+    const cleanup = service.onEvent(CONVERSATION_ID, vi.fn(), OWNER_SCOPE);
+    cleanup();
+
+    await expect(
+      service.prompt(CONVERSATION_ID, 'foreign prompt', FOREIGN_SCOPE),
+    ).rejects.toBeInstanceOf(ForbiddenException);
+    await service.prompt(CONVERSATION_ID, 'owner prompt', OWNER_SCOPE);
+    expect(session.piSession.prompt).toHaveBeenCalledWith('owner prompt');
+    await service.prompt(CONVERSATION_ID, '', OWNER_SCOPE, [
+      {
+        id: 'attachment-001',
+        name: 'diagram.png',
+        url: 'https://cdn.example.test/diagram.png',
+        mimeType: 'image/png',
+      },
+    ]);
+    expect(session.piSession.prompt).toHaveBeenLastCalledWith(
+      '\n\n[Untrusted channel attachments]\n' +
+        '{"id":"attachment-001","name":"diagram.png","mimeType":"image/png","url":"https://cdn.example.test/diagram.png"}',
+    );
+
+    await expect(service.destroySession(CONVERSATION_ID, FOREIGN_SCOPE)).rejects.toBeInstanceOf(
+      ForbiddenException,
+    );
+    expect(internals(service).sessions.has(CONVERSATION_ID)).toBe(true);
+
+    await service.destroySession(CONVERSATION_ID, OWNER_SCOPE);
+    expect(session.piSession.dispose).toHaveBeenCalled();
+    expect(internals(service).sessions.has(CONVERSATION_ID)).toBe(false);
+  });
+
+  it('derives the operator-memory scope on the createSession production path', async () => {
+    const plugin = { capture: vi.fn(), search: vi.fn() };
+    const service = makeService(plugin);
+    const buildTools = vi.spyOn(service as never, 'buildToolsForSandbox').mockReturnValue([]);
+
+    // Session construction reaches the real scope derivation before the intentionally incomplete
+    // Pi test double rejects later in createAgentSession.
+    await service.createSession(CONVERSATION_ID, OWNER_SCOPE).catch(() => undefined);
+
+    expect(buildTools).toHaveBeenCalledWith(expect.any(String), OWNER_SCOPE.userId, {
+      tenantId: OWNER_SCOPE.tenantId,
+      ownerId: OWNER_SCOPE.userId,
+      sessionId: CONVERSATION_ID,
+    });
+  });
+
+  it('denies a foreign actor before it can obtain another session operator-memory scope', async () => {
+    const plugin = { capture: vi.fn(), search: vi.fn() };
+    const service = makeService(plugin);
+    internals(service).sessions.set(CONVERSATION_ID, makeSession());
+    const buildTools = vi.spyOn(service as never, 'buildToolsForSandbox');
+
+    await expect(service.createSession(CONVERSATION_ID, FOREIGN_SCOPE)).rejects.toBeInstanceOf(
+      ForbiddenException,
+    );
+
+    expect(buildTools).not.toHaveBeenCalled();
+    expect(plugin.capture).not.toHaveBeenCalled();
+    expect(plugin.search).not.toHaveBeenCalled();
+  });
+
+  it('checks owner/tenant scope before returning an in-flight session creation', async () => {
+    const service = makeService();
+    const session = makeSession();
+    internals(service).creating.set(CONVERSATION_ID, Promise.resolve(session));
+
+    await expect(
+      service.createSession(CONVERSATION_ID, {
+        userId: FOREIGN_SCOPE.userId,
+        tenantId: FOREIGN_SCOPE.tenantId,
+      }),
+    ).rejects.toBeInstanceOf(ForbiddenException);
+
+    await expect(
+      service.createSession(CONVERSATION_ID, {
+        userId: OWNER_SCOPE.userId,
+        tenantId: OWNER_SCOPE.tenantId,
+      }),
+    ).resolves.toBe(session);
+  });
+});

apps/gateway/src/agent/__tests__/runtime-provider-registry.service.test.ts

@@ -0,0 +1,370 @@
+import { describe, expect, it } from 'vitest';
+import type {
+  AgentRuntimeProvider,
+  RuntimeAttachHandle,
+  RuntimeAttachMode,
+  RuntimeCapability,
+  RuntimeCapabilitySet,
+  RuntimeHealth,
+  RuntimeMessage,
+  RuntimeScope,
+  RuntimeSession,
+  RuntimeSessionTree,
+  RuntimeStreamEvent,
+} from '@mosaicstack/types';
+import { AgentRuntimeProviderRegistry } from '@mosaicstack/agent';
+import type { ActorTenantScope } from '../../auth/session-scope.js';
+import {
+  RuntimeProviderAuditService,
+  RuntimeProviderService,
+  type RuntimeAuditEvent,
+  type RuntimeAuditSink,
+  type RuntimeApprovalVerifier,
+} from '../runtime-provider-registry.service.js';
+
+process.env['MOSAIC_AGENT_NAME'] ??= 'test-runtime-agent';
+
+const OWNER_SCOPE: ActorTenantScope = { userId: 'owner-1', tenantId: 'tenant-1' };
+const CONTEXT = {
+  actorScope: OWNER_SCOPE,
+  channelId: 'cli',
+  correlationId: 'correlation-1',
+};
+
+class RecordingRuntimeProvider implements AgentRuntimeProvider {
+  readonly id = 'fleet';
+  readonly receivedScopes: RuntimeScope[] = [];
+  readonly sentMessages: RuntimeMessage[] = [];
+  terminateCalls = 0;
+  throwAfterSend = false;
+  throwAuthorization = false;
+
+  constructor(private readonly supported: RuntimeCapability[]) {}
+
+  async capabilities(scope: RuntimeScope): Promise<RuntimeCapabilitySet> {
+    this.receivedScopes.push(scope);
+    return { supported: this.supported };
+  }
+
+  async health(scope: RuntimeScope): Promise<RuntimeHealth> {
+    this.receivedScopes.push(scope);
+    return { status: 'healthy', checkedAt: '2026-07-12T00:00:00.000Z' };
+  }
+
+  async listSessions(scope: RuntimeScope): Promise<RuntimeSession[]> {
+    this.receivedScopes.push(scope);
+    return [];
+  }
+
+  async getSessionTree(scope: RuntimeScope): Promise<RuntimeSessionTree[]> {
+    this.receivedScopes.push(scope);
+    return [];
+  }
+
+  async *streamSession(
+    _sessionId: string,
+    _cursor: string | undefined,
+    scope: RuntimeScope,
+  ): AsyncIterable<RuntimeStreamEvent> {
+    this.receivedScopes.push(scope);
+    return;
+  }
+
+  async sendMessage(
+    _sessionId: string,
+    message: RuntimeMessage,
+    scope: RuntimeScope,
+  ): Promise<void> {
+    this.receivedScopes.push(scope);
+    this.sentMessages.push(message);
+    if (this.throwAuthorization) {
+      throw Object.assign(new Error('provider authorization denied'), { code: 'forbidden' });
+    }
+    if (this.throwAfterSend) {
+      throw new Error('provider acknowledgement failed');
+    }
+  }
+
+  async attach(
+    sessionId: string,
+    mode: RuntimeAttachMode,
+    scope: RuntimeScope,
+  ): Promise<RuntimeAttachHandle> {
+    this.receivedScopes.push(scope);
+    return {
+      attachmentId: 'attachment-1',
+      sessionId,
+      mode,
+      expiresAt: '2026-07-12T00:00:00.000Z',
+    };
+  }
+
+  async detach(_attachmentId: string, scope: RuntimeScope): Promise<void> {
+    this.receivedScopes.push(scope);
+  }
+
+  async terminate(_sessionId: string, _approvalRef: string, scope: RuntimeScope): Promise<void> {
+    this.receivedScopes.push(scope);
+    this.terminateCalls += 1;
+  }
+}
+
+class RecordingAuditSink implements RuntimeAuditSink {
+  readonly events: RuntimeAuditEvent[] = [];
+
+  async record(event: RuntimeAuditEvent): Promise<void> {
+    this.events.push(event);
+  }
+}
+
+class DenyingApprovalVerifier implements RuntimeApprovalVerifier {
+  async consume(): Promise<boolean> {
+    return false;
+  }
+}
+
+class AcceptingApprovalVerifier implements RuntimeApprovalVerifier {
+  consumedAction: Parameters<RuntimeApprovalVerifier['consume']>[1] | undefined;
+
+  async consume(
+    _approvalRef: string,
+    action: Parameters<RuntimeApprovalVerifier['consume']>[1],
+  ): Promise<boolean> {
+    this.consumedAction = action;
+    return true;
+  }
+}
+
+function makeService(
+  provider: RecordingRuntimeProvider,
+  audit: RuntimeAuditSink = new RecordingAuditSink(),
+  approval: RuntimeApprovalVerifier = new DenyingApprovalVerifier(),
+): RuntimeProviderService {
+  const registry = new AgentRuntimeProviderRegistry();
+  registry.register(provider);
+  return new RuntimeProviderService(registry, audit, approval);
+}
+
+describe('RuntimeProviderService security boundary', (): void => {
+  it('derives and freezes only the authenticated actor scope while preserving correlation metadata', async (): Promise<void> => {
+    const provider = new RecordingRuntimeProvider(['session.send']);
+    const audit = new RecordingAuditSink();
+    const service = makeService(provider, audit);
+
+    await service.sendMessage(
+      'fleet',
+      'session-1',
+      { content: 'hello', idempotencyKey: 'key-1' },
+      CONTEXT,
+    );
+
+    const providerScope = provider.receivedScopes[0];
+    expect(providerScope).toEqual({
+      actorId: OWNER_SCOPE.userId,
+      tenantId: OWNER_SCOPE.tenantId,
+      channelId: CONTEXT.channelId,
+      correlationId: CONTEXT.correlationId,
+    });
+    expect(Object.isFrozen(providerScope)).toBe(true);
+    expect(audit.events).toContainEqual(
+      expect.objectContaining({
+        providerId: 'fleet',
+        operation: 'session.send',
+        outcome: 'succeeded',
+        actorId: OWNER_SCOPE.userId,
+        tenantId: OWNER_SCOPE.tenantId,
+        channelId: CONTEXT.channelId,
+        correlationId: CONTEXT.correlationId,
+        resourceId: 'session-1',
+        durationMs: expect.any(Number),
+      }),
+    );
+    expect(JSON.stringify(audit.events)).not.toContain('hello');
+    expect(JSON.stringify(audit.events)).not.toContain('key-1');
+  });
+
+  it('does not block a provider operation when an unsafe resource ID is redacted in durable audit', async (): Promise<void> => {
+    const provider = new RecordingRuntimeProvider(['session.send']);
+    let persisted: unknown;
+    const durableAudit = new RuntimeProviderAuditService({
+      logs: {
+        ingest: async (entry: unknown): Promise<unknown> => {
+          persisted = entry;
+          return entry;
+        },
+      },
+    } as never);
+    const service = makeService(provider, durableAudit);
+
+    await service.sendMessage(
+      'fleet',
+      'session/credential-canary=secret-value',
+      { content: 'safe message', idempotencyKey: 'key-1' },
+      CONTEXT,
+    );
+
+    expect(provider.sentMessages).toHaveLength(1);
+    expect(JSON.stringify(persisted)).not.toContain('secret-value');
+  });
+
+  it('fails closed before a provider side effect when a capability is missing', async (): Promise<void> => {
+    const provider = new RecordingRuntimeProvider([]);
+    const service = makeService(provider);
+
+    await expect(
+      service.sendMessage(
+        'fleet',
+        'session-1',
+        { content: 'hello', idempotencyKey: 'key-1' },
+        CONTEXT,
+      ),
+    ).rejects.toThrow(/capability denied/);
+    expect(provider.sentMessages).toEqual([]);
+  });
+
+  it('requires a consumed exact-action approval before termination', async (): Promise<void> => {
+    const provider = new RecordingRuntimeProvider(['session.terminate']);
+    const approval = new DenyingApprovalVerifier();
+    const audit = new RecordingAuditSink();
+    const service = makeService(provider, audit, approval);
+
+    await expect(
+      service.terminate('fleet', 'session-1', 'forged-approval', CONTEXT),
+    ).rejects.toThrow(/approval denied/);
+    expect(provider.terminateCalls).toBe(0);
+    expect(audit.events.at(-1)).toMatchObject({ outcome: 'denied', errorCode: 'policy_denied' });
+  });
+
+  it('binds an accepted termination approval to provider, session, immutable scope, and correlation', async (): Promise<void> => {
+    const provider = new RecordingRuntimeProvider(['session.terminate']);
+    const approval = new AcceptingApprovalVerifier();
+    const service = makeService(provider, new RecordingAuditSink(), approval);
+
+    await service.terminate('fleet', 'session-1', 'approval-1', CONTEXT);
+
+    expect(approval.consumedAction).toEqual({
+      providerId: 'fleet',
+      sessionId: 'session-1',
+      actorId: OWNER_SCOPE.userId,
+      tenantId: OWNER_SCOPE.tenantId,
+      channelId: CONTEXT.channelId,
+      correlationId: CONTEXT.correlationId,
+      agentName: process.env['MOSAIC_AGENT_NAME'],
+    });
+    expect(provider.terminateCalls).toBe(1);
+  });
+
+  it('fails closed before invoking a provider when audit persistence rejects the request', async (): Promise<void> => {
+    const provider = new RecordingRuntimeProvider(['session.send']);
+    const unavailableAudit: RuntimeAuditSink = {
+      async record(): Promise<void> {
+        throw new Error('audit unavailable');
+      },
+    };
+    const service = makeService(provider, unavailableAudit);
+
+    await expect(
+      service.sendMessage(
+        'fleet',
+        'session-1',
+        { content: 'hello', idempotencyKey: 'key-1' },
+        CONTEXT,
+      ),
+    ).rejects.toThrow(/audit unavailable/);
+    expect(provider.sentMessages).toEqual([]);
+  });
+
+  it('records a provider error after invocation as failed rather than denied', async (): Promise<void> => {
+    const provider = new RecordingRuntimeProvider(['session.send']);
+    provider.throwAfterSend = true;
+    const audit = new RecordingAuditSink();
+    const service = makeService(provider, audit);
+
+    await expect(
+      service.sendMessage(
+        'fleet',
+        'session-1',
+        { content: 'hello', idempotencyKey: 'key-1' },
+        CONTEXT,
+      ),
+    ).rejects.toThrow(/provider acknowledgement failed/);
+    expect(provider.sentMessages).toHaveLength(1);
+    expect(audit.events.map((event: RuntimeAuditEvent): string => event.outcome)).toEqual([
+      'requested',
+      'failed',
+    ]);
+    expect(audit.events.at(-1)).toMatchObject({
+      errorCode: 'provider_error',
+      durationMs: expect.any(Number),
+    });
+  });
+
+  it('records a provider authorization rejection as denied rather than provider failure', async (): Promise<void> => {
+    const provider = new RecordingRuntimeProvider(['session.send']);
+    provider.throwAuthorization = true;
+    const audit = new RecordingAuditSink();
+    const service = makeService(provider, audit);
+
+    await expect(
+      service.sendMessage(
+        'fleet',
+        'session-1',
+        { content: 'hello', idempotencyKey: 'key-1' },
+        CONTEXT,
+      ),
+    ).rejects.toThrow(/provider authorization denied/);
+    expect(audit.events.at(-1)).toMatchObject({ outcome: 'denied', errorCode: 'policy_denied' });
+  });
+
+  it('persists only metadata-only runtime audit fields', async (): Promise<void> => {
+    let persisted: unknown;
+    const ingest = async (entry: unknown): Promise<unknown> => {
+      persisted = entry;
+      return entry;
+    };
+    const service = new RuntimeProviderAuditService({ logs: { ingest } } as never);
+
+    await service.record({
+      providerId: 'fleet',
+      operation: 'session.send',
+      outcome: 'succeeded',
+      actorId: 'owner-1',
+      tenantId: 'tenant-1',
+      channelId: 'cli',
+      correlationId: 'correlation-1',
+      resourceId: 'session-1',
+      durationMs: 12,
+    });
+
+    expect(persisted).toMatchObject({
+      content: 'runtime.provider.audit',
+      metadata: expect.objectContaining({ correlationId: 'correlation-1', durationMs: 12 }),
+    });
+    expect(JSON.stringify(persisted)).not.toContain('approval');
+  });
+
+  it('does not misreport a completed provider side effect when completion auditing fails', async (): Promise<void> => {
+    const provider = new RecordingRuntimeProvider(['session.send']);
+    let auditCalls = 0;
+    const audit: RuntimeAuditSink = {
+      async record(): Promise<void> {
+        auditCalls += 1;
+        if (auditCalls === 2) {
+          throw new Error('completion audit unavailable');
+        }
+      },
+    };
+    const service = makeService(provider, audit);
+
+    await expect(
+      service.sendMessage(
+        'fleet',
+        'session-1',
+        { content: 'hello', idempotencyKey: 'key-1' },
+        CONTEXT,
+      ),
+    ).resolves.toBeUndefined();
+    expect(provider.sentMessages).toHaveLength(1);
+    expect(auditCalls).toBe(2);
+  });
+});

apps/gateway/src/agent/__tests__/session-ownership.test.ts

@@ -0,0 +1,803 @@
+import 'reflect-metadata';
+import { readFileSync } from 'node:fs';
+import { resolve } from 'node:path';
+import { ForbiddenException, NotFoundException } from '@nestjs/common';
+import { Test, type TestingModule } from '@nestjs/testing';
+import { describe, expect, it, vi } from 'vitest';
+
+vi.mock('../agent.service.js', () => ({ AgentService: class AgentService {} }));
+vi.mock('../../commands/command-executor.service.js', () => ({
+  CommandExecutorService: class CommandExecutorService {},
+}));
+vi.mock('../routing/routing-engine.service.js', () => ({
+  RoutingEngineService: class RoutingEngineService {},
+}));
+
+import { SessionsController } from '../sessions.controller.js';
+import { AgentService } from '../agent.service.js';
+import { ChatController } from '../../chat/chat.controller.js';
+import { ChatGateway } from '../../chat/chat.gateway.js';
+import type { AgentSession } from '../agent.service.js';
+import type { SessionInfoDto } from '../session.dto.js';
+import type { HarnessAdapter, HarnessConversationService } from '@mosaicstack/types';
+import { AuthGuard } from '../../auth/auth.guard.js';
+import { AUTH } from '../../auth/auth.tokens.js';
+import { BRAIN } from '../../brain/brain.tokens.js';
+import { CommandRegistryService } from '../../commands/command-registry.service.js';
+import { CommandExecutorService } from '../../commands/command-executor.service.js';
+import { RoutingEngineService } from '../routing/routing-engine.service.js';
+import { ChatRuntimeRouter } from '../../chat/chat-runtime-router.js';
+import { EmbeddedChatRuntime } from '../../chat/embedded-chat.runtime.js';
+import { ownConversation } from '../../chat/chat-runtime.js';
+import type { LegacyRuntimeStream } from '../../chat/chat-runtime.js';
+import { HarnessChatRuntime } from '../../chat/harness-chat.runtime.js';
+import { HarnessRegistry } from '../../harness/harness.registry.js';
+import { HARNESS_CONVERSATION_SERVICE_UNAVAILABLE } from '../../harness/harness.tokens.js';
+
+const USER_A = { id: 'user-a', tenantId: 'tenant-a' };
+const USER_B = { id: 'user-b', tenantId: 'tenant-b' };
+const CONVERSATION_ID = '11111111-1111-4111-8111-111111111111';
+
+function makeSessionInfo(overrides?: Partial<SessionInfoDto>): SessionInfoDto {
+  return {
+    id: CONVERSATION_ID,
+    provider: 'test-provider',
+    modelId: 'test-model',
+    createdAt: new Date('2026-07-12T00:00:00Z').toISOString(),
+    promptCount: 0,
+    channels: [],
+    durationMs: 0,
+    metrics: {
+      tokens: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0, total: 0 },
+      modelSwitches: 0,
+      messageCount: 0,
+      lastActivityAt: new Date('2026-07-12T00:00:00Z').toISOString(),
+    },
+    ...overrides,
+  };
+}
+
+function makeAgentSession(owner = USER_A): AgentSession {
+  return {
+    id: CONVERSATION_ID,
+    provider: 'test-provider',
+    modelId: 'test-model',
+    piSession: {
+      thinkingLevel: 'off',
+      getAvailableThinkingLevels: vi.fn().mockReturnValue(['off', 'low', 'high']),
+      setThinkingLevel: vi.fn(),
+      abort: vi.fn().mockResolvedValue(undefined),
+      prompt: vi.fn().mockResolvedValue(undefined),
+      dispose: vi.fn(),
+      getSessionStats: vi.fn(),
+      getContextUsage: vi.fn(),
+    } as unknown as AgentSession['piSession'],
+    listeners: new Set(),
+    unsubscribe: vi.fn(),
+    createdAt: Date.now(),
+    promptCount: 0,
+    channels: new Set(),
+    skillPromptAdditions: [],
+    sandboxDir: '/tmp',
+    allowedTools: null,
+    userId: owner.id,
+    tenantId: owner.tenantId,
+    metrics: {
+      tokens: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0, total: 0 },
+      modelSwitches: 0,
+      messageCount: 0,
+      lastActivityAt: new Date('2026-07-12T00:00:00Z').toISOString(),
+    },
+  };
+}
+
+/**
+ * A shape-complete, non-throwing AgentService fake scoped so that USER_B (a foreign owner guessing
+ * USER_A's conversation id) is never granted the session. Because every method exists and no method
+ * throws for a wrong shape, production runs to its real ownership decision — the RED never comes from
+ * a `getSession is not a function` TypeError, only from a router-boundary/scope assertion mismatch.
+ */
+function makeScopedAgentService() {
+  const foreign = makeAgentSession(USER_A);
+  return {
+    listSessions: vi.fn((scope?: { userId: string; tenantId?: string }) =>
+      scope?.userId === USER_B.id ? [] : [makeSessionInfo({ id: foreign.id })],
+    ),
+    getSessionInfo: vi.fn((_id: string, scope?: { userId: string; tenantId?: string }) =>
+      scope?.userId === USER_B.id ? undefined : makeSessionInfo({ id: foreign.id }),
+    ),
+    destroySession: vi.fn(),
+    getSession: vi.fn((_id: string, scope?: { userId: string; tenantId?: string }) =>
+      scope?.userId === USER_B.id ? undefined : foreign,
+    ),
+    createSession: vi.fn().mockRejectedValue(new NotFoundException('Session scope mismatch')),
+    onEvent: vi.fn(() => vi.fn()),
+    addChannel: vi.fn(),
+    removeChannel: vi.fn(),
+    recordMessage: vi.fn(),
+    prompt: vi.fn().mockResolvedValue(undefined),
+  };
+}
+
+type ScopedAgentService = ReturnType<typeof makeScopedAgentService>;
+
+/**
+ * A structurally-complete harness conversation service that throws if any method is invoked.
+ * Fronted behind the legacy runtime's harness slot: the legacy path must never reach it.
+ */
+const failIfUsedConversationService = {
+  attach: () => {
+    throw new Error('harness conversation service must not be reached on the legacy path');
+  },
+  detach: () => {
+    throw new Error('harness conversation service must not be reached on the legacy path');
+  },
+  send: () => {
+    throw new Error('harness conversation service must not be reached on the legacy path');
+  },
+
+  subscribeFrom: async function* () {
+    throw new Error('harness conversation service must not be reached on the legacy path');
+  },
+} as unknown as HarnessConversationService;
+
+/** A structurally-complete, non-sentinel conversation service used to satisfy the pi-rpc readiness gate. */
+const boundConversationService = {
+  attach: () => Promise.reject(new Error('unused')),
+  detach: () => Promise.reject(new Error('unused')),
+  send: () => Promise.reject(new Error('unused')),
+
+  subscribeFrom: async function* () {
+    throw new Error('unused');
+  },
+} as unknown as HarnessConversationService;
+
+function registryWith(adapterIds: readonly string[]): HarnessRegistry {
+  const registry = new HarnessRegistry();
+  for (const id of adapterIds) {
+    registry.register({
+      id,
+      describe: () => Promise.reject(new Error('unused')),
+      catalog: () => Promise.reject(new Error('unused')),
+      create: () => Promise.reject(new Error('unused')),
+      resume: () => Promise.reject(new Error('unused')),
+    } as HarnessAdapter);
+  }
+  return registry;
+}
+
+/**
+ * Build the real legacy-mode {@link ChatRuntimeRouter} fronting a real {@link EmbeddedChatRuntime}
+ * that holds the scoped AgentService fake. This is the ONLY path server-derived scope may travel to
+ * reach an AgentService: controller/gateway → ChatRuntimeRouter → EmbeddedChatRuntime → AgentService.
+ * The `embeddedAgentService` handed here is a SEPARATE instance from the directly-injected fake, so a
+ * call landing on it proves the router-delegation redesign is live rather than the old direct path.
+ */
+function legacyRouterFronting(agentService: unknown): ChatRuntimeRouter {
+  const embedded = new EmbeddedChatRuntime(agentService as never);
+  const harness = new HarnessChatRuntime(failIfUsedConversationService);
+  const router = new ChatRuntimeRouter(
+    new HarnessRegistry(),
+    HARNESS_CONVERSATION_SERVICE_UNAVAILABLE,
+    embedded,
+    harness,
+    'legacy',
+  );
+  router.onModuleInit();
+  return router;
+}
+
+/**
+ * The AgentService method names the controller/gateway must NEVER drive on the runtime at the
+ * delegation boundary. An AgentService-shaped router shim (a method-for-method mirror) would record
+ * one of these instead of the frozen legacy op, so asserting their ABSENCE from the observed runtime
+ * call set defeats the shim on INVOCATION evidence — never satisfiable by dead source text.
+ */
+const FORBIDDEN_AGENT_OPS = [
+  'getSession',
+  'createSession',
+  'onEvent',
+  'addChannel',
+  'prompt',
+  'setThinking',
+  'abort',
+] as const;
+
+/**
+ * Wrap a real {@link ChatRuntimeRouter} in a call-recording Proxy. Every property access that yields
+ * an OWN/inherited callable is returned as a thin wrapper that appends the method name to `calls` at
+ * INVOCATION time and forwards to the real method (bound to the real target, so the router's internal
+ * delegation to the embedded runtime runs untouched below this boundary). Non-function and MISSING
+ * properties are returned verbatim via Reflect.get — the observer NEVER fabricates a value, returns a
+ * canned outcome, or delegates a not-yet-implemented named op, so it cannot itself become a shim.
+ *
+ * The result is a RUNTIME call set of exactly the methods the controller/gateway invoke ON the router
+ * at the delegation seam. Only an actual call can enter it; a dead method, comment, or string in the
+ * production source cannot. This replaces the earlier `source.toContain('<frozen op>')` proof — which
+ * a dead declaration could satisfy while production still executed a shim — with invocation evidence.
+ */
+function makeRecordingRouter(target: ChatRuntimeRouter, calls: string[]): ChatRuntimeRouter {
+  return new Proxy(target, {
+    get(t, prop) {
+      const value = Reflect.get(t, prop);
+      if (typeof value === 'function' && typeof prop === 'string') {
+        return (...args: unknown[]) => {
+          calls.push(prop);
+          return (value as (...a: unknown[]) => unknown).apply(t, args);
+        };
+      }
+      return value;
+    },
+  }) as ChatRuntimeRouter;
+}
+
+/**
+ * Real Nest DI dual-provider fixture (mirrors the blessed group-3 pattern in chat-security.test.ts).
+ *
+ * BOTH an `AgentService` provider (the FORBIDDEN direct dependency) and a `ChatRuntimeRouter` provider
+ * (fronting a real EmbeddedChatRuntime over a SEPARATE scoped AgentService) are registered. Production
+ * resolves whichever its constructor declares:
+ *   - RED today: the controller/gateway `@Inject(AgentService)` → the direct fake is consulted, the
+ *     router (and its embedded fake) is never reached.
+ *   - GREEN later: the controller/gateway inject `ChatRuntimeRouter` → the direct fake is never
+ *     touched (stays at zero) and scope is observed inside the embedded fake behind the router.
+ * The SAME test body reds today and greens later; a method-for-method AgentService shim on the router
+ * records a FORBIDDEN op (and never the frozen legacy op) in the observed runtime call set, and
+ * restoring the direct injection cannot satisfy the "direct fake at zero" / "embedded fake observed
+ * scope" / "frozen op invoked on the router" anchors. The router is wrapped by {@link
+ * makeRecordingRouter} so those anchors are runtime invocation evidence, not source substrings.
+ */
+function buildRestModule(
+  directAgentService: ScopedAgentService,
+  embeddedAgentService: ScopedAgentService,
+  routerCalls: string[],
+): Promise<TestingModule> {
+  return (
+    Test.createTestingModule({
+      controllers: [ChatController],
+      providers: [
+        { provide: AgentService, useValue: directAgentService },
+        {
+          provide: ChatRuntimeRouter,
+          useFactory: () =>
+            makeRecordingRouter(legacyRouterFronting(embeddedAgentService), routerCalls),
+        },
+      ],
+    })
+      // ChatController's @UseGuards(AuthGuard) is resolved during instance loading; AuthGuard injects
+      // AUTH, an HTTP-only concern never exercised by a direct handler call. Stub it so the graph
+      // resolves and the test reds on BEHAVIOUR, not on a DI collection error.
+      .overrideGuard(AuthGuard)
+      .useValue({ canActivate: () => true })
+      .compile()
+  );
+}
+
+function buildGatewayModule(
+  directAgentService: ScopedAgentService,
+  embeddedAgentService: ScopedAgentService,
+  routerCalls: string[],
+): Promise<TestingModule> {
+  const brain = {
+    conversations: {
+      findById: vi.fn().mockResolvedValue(undefined),
+      create: vi.fn().mockResolvedValue(undefined),
+      update: vi.fn().mockResolvedValue(undefined),
+      findMessages: vi.fn().mockResolvedValue([]),
+      addMessage: vi.fn().mockResolvedValue(undefined),
+    },
+  };
+  return Test.createTestingModule({
+    providers: [
+      ChatGateway,
+      { provide: AgentService, useValue: directAgentService },
+      { provide: AUTH, useValue: { api: { getSession: vi.fn().mockResolvedValue(null) } } },
+      { provide: BRAIN, useValue: brain },
+      { provide: CommandRegistryService, useValue: { getManifest: vi.fn().mockReturnValue([]) } },
+      { provide: CommandExecutorService, useValue: { execute: vi.fn() } },
+      {
+        provide: RoutingEngineService,
+        useValue: {
+          resolve: vi.fn().mockResolvedValue({ provider: 'test', model: 'test-model' }),
+        },
+      },
+      {
+        provide: ChatRuntimeRouter,
+        useFactory: () =>
+          makeRecordingRouter(legacyRouterFronting(embeddedAgentService), routerCalls),
+      },
+    ],
+  }).compile();
+}
+
+describe('TESS-M1-SEC-002 AgentService ownership boundary', () => {
+  it('requires explicit owner+tenant scope on protected session operations', () => {
+    const source = readFileSync(resolve('src/agent/agent.service.ts'), 'utf8');
+
+    expect(source).toContain('getSession(sessionId: string, scope: ActorTenantScope)');
+    expect(source).toContain('listSessions(scope: ActorTenantScope)');
+    expect(source).toContain('getSessionInfo(sessionId: string, scope: ActorTenantScope)');
+    expect(source).toContain(
+      'addChannel(sessionId: string, channel: string, scope: ActorTenantScope)',
+    );
+    expect(source).toContain(
+      'removeChannel(sessionId: string, channel: string, scope: ActorTenantScope)',
+    );
+    expect(source).toContain(
+      'async prompt(sessionId: string, message: string, scope: ActorTenantScope)',
+    );
+    expect(source).toContain('scope: ActorTenantScope,');
+    expect(source).toContain('async destroySession(sessionId: string, scope: ActorTenantScope)');
+    expect(source).not.toContain('scope?: ActorTenantScope');
+  });
+});
+
+describe('TESS-M1-SEC-002 REST session ownership and tenant binding', () => {
+  it('lists only sessions owned by the authenticated owner+tenant scope', () => {
+    const agentService = makeScopedAgentService();
+    const controller = new SessionsController(agentService as never);
+
+    expect(controller.list(USER_B)).toEqual({ sessions: [], total: 0 });
+    expect(agentService.listSessions).toHaveBeenCalledWith({
+      userId: USER_B.id,
+      tenantId: USER_B.tenantId,
+    });
+  });
+
+  it('does not reveal another owner/tenant session by guessed id', () => {
+    const agentService = makeScopedAgentService();
+    const controller = new SessionsController(agentService as never);
+
+    expect(() => controller.findOne(CONVERSATION_ID, USER_B)).toThrow(NotFoundException);
+    expect(agentService.getSessionInfo).toHaveBeenCalledWith(CONVERSATION_ID, {
+      userId: USER_B.id,
+      tenantId: USER_B.tenantId,
+    });
+  });
+
+  it('does not terminate another owner/tenant session by guessed id', async () => {
+    const agentService = makeScopedAgentService();
+    const controller = new SessionsController(agentService as never);
+
+    await expect(controller.destroy(CONVERSATION_ID, USER_B)).rejects.toBeInstanceOf(
+      NotFoundException,
+    );
+    expect(agentService.destroySession).not.toHaveBeenCalled();
+  });
+});
+
+describe('TESS-M1-SEC-002 REST chat send ownership and tenant binding (router-delegated legacy runtime)', () => {
+  // TESS test A — REST /api/chat send. The genuine RED is the router-delegation redesign, not a slot
+  // swap: the forbidden directly-injected AgentService must go UNtouched while the server-derived
+  // scope is observed inside the real ChatRuntimeRouter → EmbeddedChatRuntime → AgentService path.
+  it('routes a REST send through completeLegacyRestTurn and never the directly-injected AgentService', async () => {
+    const directAgentService = makeScopedAgentService(); // FORBIDDEN direct dependency
+    const embeddedAgentService = makeScopedAgentService(); // reached ONLY via router → embedded delegation
+    const routerCalls: string[] = []; // runtime call set observed AT the controller → router seam
+    const moduleRef = await buildRestModule(directAgentService, embeddedAgentService, routerCalls);
+    try {
+      const controller = moduleRef.get(ChatController, { strict: false });
+
+      // Foreign ownership is denied (never resolves) — a control that holds today AND at GREEN.
+      await expect(
+        controller.chat({ conversationId: CONVERSATION_ID, content: 'take over' }, USER_B),
+      ).rejects.toBeDefined();
+
+      // Soft anchors so EVERY anchor is evaluated under each mutation, not just the first to fail.
+
+      // RUNTIME anchor A1 — delegation: the controller must INVOKE the frozen legacy op on the router.
+      // Only an actual call enters routerCalls; a dead method/comment/string cannot. RED today (the
+      // controller @Inject(AgentService) and never calls the router). GREEN once it drives the op.
+      expect
+        .soft(routerCalls, 'controller must invoke completeLegacyRestTurn on the router')
+        .toContain('completeLegacyRestTurn');
+      // RUNTIME anchor A2 — nondelegation: the controller must not drive any AgentService-shaped op on
+      // the router. An AgentService-shaped router shim records one of these → RED, defeating the shim
+      // on invocation evidence (not source text). A dead named method added alongside the shim does not
+      // help: it is never invoked, so it never enters routerCalls while a forbidden op still does.
+      for (const op of FORBIDDEN_AGENT_OPS) {
+        expect
+          .soft(routerCalls, `router seam must not invoke AgentService.${op}`)
+          .not.toContain(op);
+      }
+      // RUNTIME anchor A3 — the forbidden directly-injected AgentService stays at zero (fails today;
+      // restoring the direct injection keeps it failing).
+      expect.soft(directAgentService.getSession).not.toHaveBeenCalled();
+      // RUNTIME anchor A4 — server-derived scope observed INSIDE the separate embedded fake behind the
+      // router (fails today; the router path is never taken).
+      expect.soft(embeddedAgentService.getSession).toHaveBeenCalledWith(CONVERSATION_ID, {
+        userId: USER_B.id,
+        tenantId: USER_B.tenantId,
+      });
+
+      // Zero foreign mutation on either path (holds today and at GREEN).
+      expect.soft(directAgentService.prompt).not.toHaveBeenCalled();
+      expect.soft(embeddedAgentService.prompt).not.toHaveBeenCalled();
+
+      // Defense-in-depth (NOT load-bearing; the runtime anchors above carry the anti-mask): the
+      // controller no longer declares the direct embedded AgentService dependency. A negative source
+      // check cannot be satisfied by dead text — it only fails when the injection is present.
+      const controllerSource = readFileSync(resolve('src/chat/chat.controller.ts'), 'utf8');
+      expect.soft(controllerSource).not.toContain('@Inject(AgentService)');
+    } finally {
+      await moduleRef.close();
+    }
+  });
+});
+
+describe('TESS-M1-SEC-002 WebSocket session ownership and tenant binding (router-delegated legacy runtime)', () => {
+  function makeSocket() {
+    return {
+      id: 'socket-b',
+      connected: true,
+      data: { user: USER_B, session: { id: 'auth-session-b', userId: USER_B.id } },
+      emit: vi.fn(),
+      disconnect: vi.fn(),
+    };
+  }
+
+  // TESS test B — WebSocket send/attach.
+  it('routes a WebSocket send through prepareLegacySocketTurn and never the directly-injected AgentService', async () => {
+    const directAgentService = makeScopedAgentService();
+    const embeddedAgentService = makeScopedAgentService();
+    const routerCalls: string[] = [];
+    const moduleRef = await buildGatewayModule(
+      directAgentService,
+      embeddedAgentService,
+      routerCalls,
+    );
+    try {
+      const gateway = moduleRef.get(ChatGateway, { strict: false });
+      const socket = makeSocket();
+
+      await Promise.resolve(
+        gateway.handleMessage(socket as never, {
+          conversationId: CONVERSATION_ID,
+          content: 'attach to foreign session',
+        }),
+      ).catch(() => undefined);
+
+      // RUNTIME anchor B1 — delegation: the gateway must invoke the frozen socket op on the router.
+      expect
+        .soft(routerCalls, 'gateway must invoke prepareLegacySocketTurn on the router')
+        .toContain('prepareLegacySocketTurn');
+      // RUNTIME anchor B2 — nondelegation: no AgentService-shaped op on the router (defeats the shim).
+      for (const op of FORBIDDEN_AGENT_OPS) {
+        expect
+          .soft(routerCalls, `router seam must not invoke AgentService.${op}`)
+          .not.toContain(op);
+      }
+      // RED anchor B3 — forbidden direct AgentService untouched (fails today, gateway injects it).
+      expect.soft(directAgentService.getSession).not.toHaveBeenCalled();
+      // RED anchor B4 — scope observed inside router → embedded delegation (fails today, never reached).
+      expect.soft(embeddedAgentService.getSession).toHaveBeenCalledWith(CONVERSATION_ID, {
+        userId: USER_B.id,
+        tenantId: USER_B.tenantId,
+      });
+      // Foreign session gets zero lease/listener/channel/prompt on EITHER path (holds today and GREEN).
+      expect.soft(directAgentService.onEvent).not.toHaveBeenCalled();
+      expect.soft(directAgentService.addChannel).not.toHaveBeenCalled();
+      expect.soft(directAgentService.prompt).not.toHaveBeenCalled();
+      expect.soft(embeddedAgentService.onEvent).not.toHaveBeenCalled();
+      expect.soft(embeddedAgentService.addChannel).not.toHaveBeenCalled();
+      expect.soft(embeddedAgentService.prompt).not.toHaveBeenCalled();
+      expect
+        .soft(socket.emit)
+        .toHaveBeenCalledWith(
+          'error',
+          expect.objectContaining({ conversationId: CONVERSATION_ID }),
+        );
+
+      // Defense-in-depth (NOT load-bearing): gateway no longer declares the direct dependency.
+      const gatewaySource = readFileSync(resolve('src/chat/chat.gateway.ts'), 'utf8');
+      expect.soft(gatewaySource).not.toContain('@Inject(AgentService)');
+    } finally {
+      await moduleRef.close();
+    }
+  });
+
+  // TESS test C — WebSocket set:thinking.
+  it('routes set:thinking through setLegacyThinking and never the directly-injected AgentService', async () => {
+    const directAgentService = makeScopedAgentService();
+    const embeddedAgentService = makeScopedAgentService();
+    const routerCalls: string[] = [];
+    const moduleRef = await buildGatewayModule(
+      directAgentService,
+      embeddedAgentService,
+      routerCalls,
+    );
+    try {
+      const gateway = moduleRef.get(ChatGateway, { strict: false });
+      const socket = makeSocket();
+
+      await Promise.resolve(
+        gateway.handleSetThinking(socket as never, {
+          conversationId: CONVERSATION_ID,
+          level: 'high',
+        }),
+      ).catch(() => undefined);
+
+      // RUNTIME anchor C1 — delegation: the gateway must invoke the frozen thinking op on the router.
+      expect
+        .soft(routerCalls, 'gateway must invoke setLegacyThinking on the router')
+        .toContain('setLegacyThinking');
+      // RUNTIME anchor C2 — nondelegation: no AgentService-shaped op on the router (defeats the shim).
+      for (const op of FORBIDDEN_AGENT_OPS) {
+        expect
+          .soft(routerCalls, `router seam must not invoke AgentService.${op}`)
+          .not.toContain(op);
+      }
+      expect.soft(directAgentService.getSession).not.toHaveBeenCalled();
+      expect.soft(embeddedAgentService.getSession).toHaveBeenCalledWith(CONVERSATION_ID, {
+        userId: USER_B.id,
+        tenantId: USER_B.tenantId,
+      });
+      expect
+        .soft(socket.emit)
+        .toHaveBeenCalledWith(
+          'error',
+          expect.objectContaining({ conversationId: CONVERSATION_ID }),
+        );
+    } finally {
+      await moduleRef.close();
+    }
+  });
+
+  // TESS test D — WebSocket abort.
+  it('routes abort through abortLegacyTurn and never the directly-injected AgentService', async () => {
+    const directAgentService = makeScopedAgentService();
+    const embeddedAgentService = makeScopedAgentService();
+    const routerCalls: string[] = [];
+    const moduleRef = await buildGatewayModule(
+      directAgentService,
+      embeddedAgentService,
+      routerCalls,
+    );
+    try {
+      const gateway = moduleRef.get(ChatGateway, { strict: false });
+      const socket = makeSocket();
+
+      await Promise.resolve(
+        gateway.handleAbort(socket as never, { conversationId: CONVERSATION_ID }),
+      ).catch(() => undefined);
+
+      // RUNTIME anchor D1 — delegation: the gateway must invoke the frozen abort op on the router.
+      expect
+        .soft(routerCalls, 'gateway must invoke abortLegacyTurn on the router')
+        .toContain('abortLegacyTurn');
+      // RUNTIME anchor D2 — nondelegation: no AgentService-shaped op on the router (defeats the shim).
+      for (const op of FORBIDDEN_AGENT_OPS) {
+        expect
+          .soft(routerCalls, `router seam must not invoke AgentService.${op}`)
+          .not.toContain(op);
+      }
+      expect.soft(directAgentService.getSession).not.toHaveBeenCalled();
+      expect.soft(embeddedAgentService.getSession).toHaveBeenCalledWith(CONVERSATION_ID, {
+        userId: USER_B.id,
+        tenantId: USER_B.tenantId,
+      });
+      expect
+        .soft(socket.emit)
+        .toHaveBeenCalledWith(
+          'error',
+          expect.objectContaining({ conversationId: CONVERSATION_ID }),
+        );
+    } finally {
+      await moduleRef.close();
+    }
+  });
+
+  // TESS test E (genuine, unchanged) — pi-rpc browser-legacy refusal.
+  it('rejects a browser legacy raw message in pi-rpc mode with a fixed typed unsupported and executes nothing', async () => {
+    // pi-rpc: the harness runtime is live. The browser legacy `message` path is unsupported and
+    // must be refused with a fixed typed code, touching neither the embedded AgentService nor the
+    // harness conversation service.
+    const agentService = makeScopedAgentService();
+    const embedded = new EmbeddedChatRuntime(agentService as never);
+    const harnessConversation = {
+      attach: vi.fn(),
+      detach: vi.fn(),
+      send: vi.fn(),
+      subscribeFrom: vi.fn(),
+    };
+    const harness = new HarnessChatRuntime(harnessConversation as never);
+    const router = new ChatRuntimeRouter(
+      registryWith(['pi']),
+      boundConversationService,
+      embedded,
+      harness,
+      'pi-rpc',
+    );
+    router.onModuleInit();
+
+    const brain = {
+      conversations: {
+        findById: vi.fn().mockResolvedValue(undefined),
+        create: vi.fn().mockResolvedValue(undefined),
+        update: vi.fn().mockResolvedValue(undefined),
+        findMessages: vi.fn().mockResolvedValue([]),
+        addMessage: vi.fn().mockResolvedValue(undefined),
+      },
+    };
+    const gateway = new ChatGateway(
+      router as never,
+      {} as never,
+      brain as never,
+      { getManifest: vi.fn().mockReturnValue([]) } as never,
+      { execute: vi.fn() } as never,
+      { resolve: vi.fn() } as never,
+    );
+    const socket = {
+      id: 'socket-b',
+      connected: true,
+      data: { user: USER_B, session: { id: 'auth-session-b', userId: USER_B.id } },
+      emit: vi.fn(),
+      disconnect: vi.fn(),
+    };
+
+    await Promise.resolve(
+      gateway.handleMessage(socket as never, {
+        conversationId: CONVERSATION_ID,
+        content: 'route me',
+      }),
+    ).catch(() => undefined);
+
+    expect(socket.emit).toHaveBeenCalledWith(
+      'error',
+      expect.objectContaining({ code: 'runtime_unsupported' }),
+    );
+    expect(agentService.getSession).not.toHaveBeenCalled();
+    expect(agentService.prompt).not.toHaveBeenCalled();
+    expect(harnessConversation.attach).not.toHaveBeenCalled();
+    expect(harnessConversation.send).not.toHaveBeenCalled();
+  });
+});
+
+// ---------------------------------------------------------------------------
+// Task-5 AMEND — embedded runtime lease lifecycle (G1) + ownership collapse (G5).
+// These drive the real EmbeddedChatRuntime directly over a shape-complete AgentService
+// fake (every touched method exists, so a RED can only come from behavior, never a
+// `getSession is not a function` TypeError). Ownership context is minted through the
+// real `ownConversation` factory — the only sanctioned way to reach a port op.
+// ---------------------------------------------------------------------------
+
+const EMBEDDED_SCOPE = { userId: USER_A.id, tenantId: USER_A.tenantId };
+const CONVERSATION_UNAVAILABLE_RESULT = {
+  ok: false,
+  code: 'conversation_unavailable',
+  retryable: false,
+} as const;
+
+/** A stream sink; `channelId` is server-derived, `onEvent` records nothing here. */
+function makeStream(): LegacyRuntimeStream {
+  return { channelId: 'websocket:test-1', onEvent: vi.fn() };
+}
+
+/**
+ * getSession → undefined (session missing), createSession → rejects with `err`. Exercises the
+ * `resolveOrCreate` collapse branch. `prompt` exists so its ABSENCE from the call record proves
+ * the turn short-circuited before any dispatch.
+ */
+function makeCollapsingAgentService(err: Error) {
+  return {
+    getSession: vi.fn(() => undefined),
+    createSession: vi.fn().mockRejectedValue(err),
+    onEvent: vi.fn(() => vi.fn()),
+    addChannel: vi.fn(),
+    removeChannel: vi.fn(),
+    prompt: vi.fn().mockResolvedValue(undefined),
+    recordTokenUsage: vi.fn(),
+  };
+}
+
+/** getSession → a live owned session, so `resolveOrCreate` succeeds and a lease is built. */
+function makeLeaseAgentService() {
+  const session = makeAgentSession(USER_A);
+  const unsubscribe = vi.fn();
+  const svc = {
+    getSession: vi.fn(() => session),
+    createSession: vi.fn(),
+    onEvent: vi.fn(() => unsubscribe),
+    addChannel: vi.fn(),
+    removeChannel: vi.fn(),
+    prompt: vi.fn().mockResolvedValue(undefined),
+    recordTokenUsage: vi.fn(),
+  };
+  return { svc, unsubscribe, session };
+}
+
+describe('TESS Task-5 embedded ownership collapse (missing and foreign are indistinguishable, never throw)', () => {
+  const ctx = ownConversation(CONVERSATION_ID, EMBEDDED_SCOPE);
+
+  it('collapses a foreign (Forbidden) create to conversation_unavailable and never throws', async () => {
+    const svc = makeCollapsingAgentService(new ForbiddenException('foreign owner'));
+    const runtime = new EmbeddedChatRuntime(svc as never);
+
+    const result = await runtime.completeLegacyRestTurn(ctx, { content: 'take over' });
+
+    expect(result).toEqual(CONVERSATION_UNAVAILABLE_RESULT);
+    expect(svc.prompt).not.toHaveBeenCalled();
+  });
+
+  it('collapses a missing (NotFound) create to conversation_unavailable and never throws', async () => {
+    const svc = makeCollapsingAgentService(new NotFoundException('no such conversation'));
+    const runtime = new EmbeddedChatRuntime(svc as never);
+
+    const result = await runtime.completeLegacyRestTurn(ctx, { content: 'hello' });
+
+    expect(result).toEqual(CONVERSATION_UNAVAILABLE_RESULT);
+    expect(svc.prompt).not.toHaveBeenCalled();
+  });
+
+  it('returns the IDENTICAL collapse for foreign and missing so neither can be distinguished', async () => {
+    const foreign = new EmbeddedChatRuntime(
+      makeCollapsingAgentService(new ForbiddenException('foreign owner')) as never,
+    );
+    const missing = new EmbeddedChatRuntime(
+      makeCollapsingAgentService(new NotFoundException('no such conversation')) as never,
+    );
+
+    const foreignResult = await foreign.completeLegacyRestTurn(ctx, { content: 'x' });
+    const missingResult = await missing.completeLegacyRestTurn(ctx, { content: 'x' });
+
+    expect(foreignResult).toEqual(missingResult);
+    expect(foreignResult).toEqual(CONVERSATION_UNAVAILABLE_RESULT);
+  });
+});
+
+describe('TESS Task-5 embedded socket lease lifecycle (one-shot dispatch, idempotent dispose, partial-setup rollback)', () => {
+  const ctx = ownConversation(CONVERSATION_ID, EMBEDDED_SCOPE);
+
+  it('dispatches the turn exactly once; a second dispatch is a no-op turn_already_dispatched', async () => {
+    const { svc } = makeLeaseAgentService();
+    const runtime = new EmbeddedChatRuntime(svc as never);
+
+    const prepared = await runtime.prepareLegacySocketTurn(ctx, { content: 'first' }, makeStream());
+    expect(prepared.ok).toBe(true);
+    if (!prepared.ok) throw new Error('prepareLegacySocketTurn should succeed');
+    const lease = prepared.value;
+
+    const first = await lease.dispatch();
+    expect(first).toEqual({ ok: true, value: undefined });
+    expect(svc.prompt).toHaveBeenCalledTimes(1);
+
+    const second = await lease.dispatch();
+    expect(second).toEqual({ ok: false, code: 'turn_already_dispatched', retryable: false });
+    // Zero additional effect — the second dispatch must not prompt again.
+    expect(svc.prompt).toHaveBeenCalledTimes(1);
+  });
+
+  it('disposes once; a second dispose is a silent no-op that never re-detaches or destroys the session', async () => {
+    const { svc, unsubscribe, session } = makeLeaseAgentService();
+    const runtime = new EmbeddedChatRuntime(svc as never);
+
+    const prepared = await runtime.prepareLegacySocketTurn(ctx, { content: 'x' }, makeStream());
+    expect(prepared.ok).toBe(true);
+    if (!prepared.ok) throw new Error('prepareLegacySocketTurn should succeed');
+    const lease = prepared.value;
+
+    await lease.dispose();
+    await lease.dispose();
+
+    // Listener + channel torn down exactly once across two dispose calls.
+    expect(unsubscribe).toHaveBeenCalledTimes(1);
+    expect(svc.removeChannel).toHaveBeenCalledTimes(1);
+    // Disposal never terminates the underlying session or process.
+    expect(session.piSession.abort).not.toHaveBeenCalled();
+    expect(session.piSession.dispose).not.toHaveBeenCalled();
+  });
+
+  it('rolls back the acquired listener and returns a total safe failure when channel attach fails mid-setup', async () => {
+    const { svc, unsubscribe } = makeLeaseAgentService();
+    svc.addChannel = vi.fn(() => {
+      throw new Error('channel attach failed');
+    });
+    const runtime = new EmbeddedChatRuntime(svc as never);
+
+    // Must NOT throw out of the port — a partial setup collapses to a total safe failure.
+    const prepared = await runtime.prepareLegacySocketTurn(ctx, { content: 'x' }, makeStream());
+    expect(prepared.ok).toBe(false);
+    // Exactly what was acquired (the event listener) is rolled back.
+    expect(unsubscribe).toHaveBeenCalledTimes(1);
+  });
+});

apps/gateway/src/agent/agent.module.ts

@@ -1,4 +1,5 @@
 import { Global, Module } from '@nestjs/common';
+import { AgentRuntimeProviderRegistry, HermesRuntimeProvider } from '@mosaicstack/agent';
 import { AgentService } from './agent.service.js';
 import { ProviderService } from './provider.service.js';
 import { ProviderCredentialsService } from './provider-credentials.service.js';
@@ -8,24 +9,79 @@ import { SkillLoaderService } from './skill-loader.service.js';
 import { ProvidersController } from './providers.controller.js';
 import { SessionsController } from './sessions.controller.js';
 import { AgentConfigsController } from './agent-configs.controller.js';
+import { InteractionController } from './interaction.controller.js';
 import { RoutingController } from './routing/routing.controller.js';
+import { DurableSessionRepository } from './durable-session.repository.js';
+import { DurableSessionService } from './durable-session.service.js';
 import { CoordModule } from '../coord/coord.module.js';
 import { McpClientModule } from '../mcp-client/mcp-client.module.js';
 import { SkillsModule } from '../skills/skills.module.js';
 import { GCModule } from '../gc/gc.module.js';
+import { LogModule } from '../log/log.module.js';
+import { CommandsModule } from '../commands/commands.module.js';
+import { CommandRuntimeApprovalVerifier } from '../commands/runtime-approval-verifier.js';
+import { GatewayHermesRuntimeTransport } from './hermes-runtime.transport.js';
+import { ConnectorLeaseRepository } from './connector-lease.repository.js';
+import {
+  CONNECTOR_LEASE_POLICY,
+  ConnectorLeaseService,
+  DenyConnectorLeasePolicy,
+} from './connector-lease.service.js';
+import {
+  AGENT_RUNTIME_PROVIDER_REGISTRY,
+  RUNTIME_APPROVAL_VERIFIER,
+  RUNTIME_PROVIDER_AUDIT_SINK,
+  RuntimeProviderAuditService,
+  RuntimeProviderService,
+} from './runtime-provider-registry.service.js';
+
+export function createGatewayRuntimeProviderRegistry(): AgentRuntimeProviderRegistry {
+  const registry = new AgentRuntimeProviderRegistry();
+  registry.register(new HermesRuntimeProvider(new GatewayHermesRuntimeTransport()));
+  return registry;
+}
 
 @Global()
 @Module({
-  imports: [CoordModule, McpClientModule, SkillsModule, GCModule],
+  imports: [CoordModule, McpClientModule, SkillsModule, GCModule, LogModule, CommandsModule],
   providers: [
     ProviderService,
     ProviderCredentialsService,
     RoutingService,
     RoutingEngineService,
     SkillLoaderService,
+    DurableSessionRepository,
+    DurableSessionService,
+    ConnectorLeaseRepository,
+    DenyConnectorLeasePolicy,
+    {
+      provide: CONNECTOR_LEASE_POLICY,
+      useExisting: DenyConnectorLeasePolicy,
+    },
+    ConnectorLeaseService,
+    {
+      provide: AGENT_RUNTIME_PROVIDER_REGISTRY,
+      useFactory: createGatewayRuntimeProviderRegistry,
+    },
+    RuntimeProviderAuditService,
+    {
+      provide: RUNTIME_PROVIDER_AUDIT_SINK,
+      useExisting: RuntimeProviderAuditService,
+    },
+    {
+      provide: RUNTIME_APPROVAL_VERIFIER,
+      useExisting: CommandRuntimeApprovalVerifier,
+    },
+    RuntimeProviderService,
     AgentService,
   ],
-  controllers: [ProvidersController, SessionsController, AgentConfigsController, RoutingController],
+  controllers: [
+    ProvidersController,
+    SessionsController,
+    AgentConfigsController,
+    InteractionController,
+    RoutingController,
+  ],
   exports: [
     AgentService,
     ProviderService,
@@ -33,6 +89,10 @@ import { GCModule } from '../gc/gc.module.js';
     RoutingService,
     RoutingEngineService,
     SkillLoaderService,
+    DurableSessionService,
+    RuntimeProviderService,
+    ConnectorLeaseService,
+    AGENT_RUNTIME_PROVIDER_REGISTRY,
   ],
 })
 export class AgentModule {}

apps/gateway/src/agent/agent.service.ts

@@ -1,4 +1,11 @@
-import { Inject, Injectable, Logger, Optional, type OnModuleDestroy } from '@nestjs/common';
+import {
+  ForbiddenException,
+  Inject,
+  Injectable,
+  Logger,
+  Optional,
+  type OnModuleDestroy,
+} from '@nestjs/common';
 import {
   createAgentSession,
   DefaultResourceLoader,
@@ -8,9 +15,11 @@ import {
   type ToolDefinition,
 } from '@mariozechner/pi-coding-agent';
 import type { Brain } from '@mosaicstack/brain';
-import type { Memory } from '@mosaicstack/memory';
+import type { ChannelAttachmentDto } from '@mosaicstack/types';
+import type { Memory, OperatorMemoryPlugin } from '@mosaicstack/memory';
 import { BRAIN } from '../brain/brain.tokens.js';
 import { MEMORY } from '../memory/memory.tokens.js';
+import { OPERATOR_MEMORY_PLUGIN } from '../memory/memory.module.js';
 import { EmbeddingService } from '../memory/embedding.service.js';
 import { CoordService } from '../coord/coord.service.js';
 import { ProviderService } from './provider.service.js';
@@ -28,12 +37,15 @@ import type { SessionInfoDto, SessionMetrics } from './session.dto.js';
 import { SystemOverrideService } from '../preferences/system-override.service.js';
 import { PreferencesService } from '../preferences/preferences.service.js';
 import { SessionGCService } from '../gc/session-gc.service.js';
+import type { ActorTenantScope } from '../auth/session-scope.js';
 
 /** A single message from DB conversation history, used for context injection. */
 export interface ConversationHistoryMessage {
   role: 'user' | 'assistant' | 'system';
   content: string;
   createdAt: Date;
+  /** Validated, URI-referenced channel attachments preserved on session resume. */
+  attachments?: readonly ChannelAttachmentDto[];
 }
 
 export interface AgentSessionOptions {
@@ -68,6 +80,8 @@ export interface AgentSessionOptions {
   agentConfigId?: string;
   /** ID of the user who owns this session. Used for preferences and system override lookups. */
   userId?: string;
+  /** Server-derived tenant scope that owns this session. Falls back to userId for solo users. */
+  tenantId?: string;
   /**
    * Prior conversation messages to inject as context when resuming a session.
    * These messages are formatted and prepended to the system prompt so the
@@ -94,6 +108,8 @@ export interface AgentSession {
   allowedTools: string[] | null;
   /** User ID that owns this session, used for preference lookups. */
   userId?: string;
+  /** Server-derived tenant scope that owns this session. Falls back to userId for solo users. */
+  tenantId?: string;
   /** Agent config ID applied to this session, if any (M5-001). */
   agentConfigId?: string;
   /** Human-readable agent name applied to this session, if any (M5-001). */
@@ -123,6 +139,9 @@ export class AgentService implements OnModuleDestroy {
     @Inject(PreferencesService)
     private readonly preferencesService: PreferencesService | null,
     @Inject(SessionGCService) private readonly gc: SessionGCService,
+    @Optional()
+    @Inject(OPERATOR_MEMORY_PLUGIN)
+    private readonly operatorMemory: OperatorMemoryPlugin | null = null,
   ) {}
 
   /**
@@ -134,6 +153,7 @@ export class AgentService implements OnModuleDestroy {
   private buildToolsForSandbox(
     sandboxDir: string,
     sessionUserId: string | undefined,
+    sessionScope?: { tenantId: string; ownerId: string; sessionId: string },
   ): ToolDefinition[] {
     return [
       ...createBrainTools(this.brain),
@@ -142,6 +162,9 @@ export class AgentService implements OnModuleDestroy {
         this.memory,
         this.embeddingService.available ? this.embeddingService : null,
         sessionUserId,
+        this.operatorMemory && sessionScope
+          ? { plugin: this.operatorMemory, scope: sessionScope }
+          : undefined,
       ),
       ...createFileTools(sandboxDir),
       ...createGitTools(sandboxDir),
@@ -174,12 +197,20 @@ export class AgentService implements OnModuleDestroy {
       .filter((t) => t.length > 0);
   }
 
-  async createSession(sessionId: string, options?: AgentSessionOptions): Promise<AgentSession> {
+  async createSession(sessionId: string, options: AgentSessionOptions): Promise<AgentSession> {
+    const scope = this.scopeFromOptions(options);
     const existing = this.sessions.get(sessionId);
-    if (existing) return existing;
+    if (existing) {
+      this.assertSessionScope(existing, scope);
+      return existing;
+    }
 
     const inflight = this.creating.get(sessionId);
-    if (inflight) return inflight;
+    if (inflight) {
+      const session = await inflight;
+      this.assertSessionScope(session, scope);
+      return session;
+    }
 
     const promise = this.doCreateSession(sessionId, options).finally(() => {
       this.creating.delete(sessionId);
@@ -208,6 +239,7 @@ export class AgentService implements OnModuleDestroy {
           isAdmin: options.isAdmin,
           agentConfigId: options.agentConfigId,
           userId: options.userId,
+          tenantId: options.tenantId,
           conversationHistory: options.conversationHistory,
         };
         this.logger.log(
@@ -247,7 +279,15 @@ export class AgentService implements OnModuleDestroy {
     }
 
     // Build per-session tools scoped to the sandbox directory and authenticated user
-    const sandboxTools = this.buildToolsForSandbox(sandboxDir, mergedOptions?.userId);
+    const sessionUserId = mergedOptions?.userId;
+    const sessionTenantId = this.tenantIdFor(sessionUserId, mergedOptions?.tenantId);
+    const sandboxTools = this.buildToolsForSandbox(
+      sandboxDir,
+      sessionUserId,
+      sessionUserId && sessionTenantId
+        ? { tenantId: sessionTenantId, ownerId: sessionUserId, sessionId }
+        : undefined,
+    );
 
     // Combine static tools with dynamically discovered MCP client tools and skill tools
     const mcpTools = this.mcpClientService.getToolDefinitions();
@@ -342,6 +382,7 @@ export class AgentService implements OnModuleDestroy {
       sandboxDir,
       allowedTools,
       userId: mergedOptions?.userId,
+      tenantId: sessionTenantId,
       agentConfigId: mergedOptions?.agentConfigId,
       agentName: resolvedAgentName,
       metrics: {
@@ -390,7 +431,7 @@ export class AgentService implements OnModuleDestroy {
     const formatMessage = (msg: ConversationHistoryMessage): string => {
       const roleLabel =
         msg.role === 'user' ? 'User' : msg.role === 'assistant' ? 'Assistant' : 'System';
-      return `**${roleLabel}:** ${msg.content}`;
+      return `**${roleLabel}:** ${msg.content}${this.attachmentContext(msg.attachments ?? [])}`;
     };
 
     const formatted = history.map((msg) => formatMessage(msg));
@@ -449,6 +490,21 @@ export class AgentService implements OnModuleDestroy {
     return result;
   }
 
+  private attachmentContext(attachments: readonly ChannelAttachmentDto[]): string {
+    if (attachments.length === 0) return '';
+    return `\n\n[Untrusted channel attachments]\n${attachments
+      .map((attachment: ChannelAttachmentDto): string =>
+        JSON.stringify({
+          id: attachment.id,
+          name: attachment.name,
+          mimeType: attachment.mimeType,
+          url: attachment.url,
+          ...(attachment.sizeBytes !== undefined ? { sizeBytes: attachment.sizeBytes } : {}),
+        }),
+      )
+      .join('\n')}`;
+  }
+
   private resolveModel(options?: AgentSessionOptions) {
     if (!options?.provider && !options?.modelId) {
       return this.providerService.getDefaultModel() ?? null;
@@ -473,38 +529,70 @@ export class AgentService implements OnModuleDestroy {
     return this.providerService.getDefaultModel() ?? null;
   }
 
-  getSession(sessionId: string): AgentSession | undefined {
-    return this.sessions.get(sessionId);
+  getSession(sessionId: string, scope: ActorTenantScope): AgentSession | undefined {
+    const session = this.sessions.get(sessionId);
+    if (!session || !this.sessionMatchesScope(session, scope)) return undefined;
+    return session;
   }
 
-  listSessions(): SessionInfoDto[] {
+  listSessions(scope: ActorTenantScope): SessionInfoDto[] {
     const now = Date.now();
-    return Array.from(this.sessions.values()).map((s) => ({
-      id: s.id,
-      provider: s.provider,
-      modelId: s.modelId,
-      ...(s.agentName ? { agentName: s.agentName } : {}),
-      createdAt: new Date(s.createdAt).toISOString(),
-      promptCount: s.promptCount,
-      channels: Array.from(s.channels),
-      durationMs: now - s.createdAt,
-      metrics: { ...s.metrics },
-    }));
+    return Array.from(this.sessions.values())
+      .filter((s) => this.sessionMatchesScope(s, scope))
+      .map((s) => this.toSessionInfo(s, now));
   }
 
-  getSessionInfo(sessionId: string): SessionInfoDto | undefined {
+  listAllSessionsForSystem(): SessionInfoDto[] {
+    const now = Date.now();
+    return Array.from(this.sessions.values()).map((s) => this.toSessionInfo(s, now));
+  }
+
+  getSessionInfo(sessionId: string, scope: ActorTenantScope): SessionInfoDto | undefined {
     const s = this.sessions.get(sessionId);
-    if (!s) return undefined;
+    if (!s || !this.sessionMatchesScope(s, scope)) return undefined;
+    return this.toSessionInfo(s);
+  }
+
+  private scopeFromOptions(options: AgentSessionOptions): ActorTenantScope {
+    if (!options.userId) {
+      throw new ForbiddenException('Session owner scope is required');
+    }
     return {
-      id: s.id,
-      provider: s.provider,
-      modelId: s.modelId,
-      ...(s.agentName ? { agentName: s.agentName } : {}),
-      createdAt: new Date(s.createdAt).toISOString(),
-      promptCount: s.promptCount,
-      channels: Array.from(s.channels),
-      durationMs: Date.now() - s.createdAt,
-      metrics: { ...s.metrics },
+      userId: options.userId,
+      tenantId: this.tenantIdFor(options.userId, options.tenantId) ?? options.userId,
+    };
+  }
+
+  private tenantIdFor(
+    userId: string | undefined,
+    tenantId: string | undefined,
+  ): string | undefined {
+    return tenantId ?? userId;
+  }
+
+  private sessionMatchesScope(session: AgentSession, scope: ActorTenantScope): boolean {
+    return (
+      session.userId === scope.userId && (session.tenantId ?? session.userId) === scope.tenantId
+    );
+  }
+
+  private assertSessionScope(session: AgentSession, scope: ActorTenantScope): void {
+    if (!this.sessionMatchesScope(session, scope)) {
+      throw new ForbiddenException('Session does not belong to the current owner/tenant scope');
+    }
+  }
+
+  private toSessionInfo(session: AgentSession, now = Date.now()): SessionInfoDto {
+    return {
+      id: session.id,
+      provider: session.provider,
+      modelId: session.modelId,
+      ...(session.agentName ? { agentName: session.agentName } : {}),
+      createdAt: new Date(session.createdAt).toISOString(),
+      promptCount: session.promptCount,
+      channels: Array.from(session.channels),
+      durationMs: now - session.createdAt,
+      metrics: { ...session.metrics },
     };
   }
 
@@ -553,9 +641,10 @@ export class AgentService implements OnModuleDestroy {
    * not reconstructed — the model is used on the next createSession call for
    * the same conversationId when the session is torn down or a new one is created.
    */
-  updateSessionModel(sessionId: string, modelId: string): void {
+  updateSessionModel(sessionId: string, modelId: string, scope: ActorTenantScope): void {
     const session = this.sessions.get(sessionId);
     if (!session) return;
+    this.assertSessionScope(session, scope);
     const prev = session.modelId;
     session.modelId = modelId;
     this.recordModelSwitch(sessionId);
@@ -572,48 +661,67 @@ export class AgentService implements OnModuleDestroy {
     sessionId: string,
     agentConfigId: string,
     agentName: string,
+    scope: ActorTenantScope,
     modelId?: string,
   ): void {
     const session = this.sessions.get(sessionId);
     if (!session) return;
+    this.assertSessionScope(session, scope);
     session.agentConfigId = agentConfigId;
     session.agentName = agentName;
     if (modelId) {
-      this.updateSessionModel(sessionId, modelId);
+      this.updateSessionModel(sessionId, modelId, scope);
     }
     this.logger.log(
       `Session ${sessionId}: agent switched to "${agentName}" (${agentConfigId}) (M5-003)`,
     );
   }
 
-  addChannel(sessionId: string, channel: string): void {
+  addChannel(sessionId: string, channel: string, scope: ActorTenantScope): void {
     const session = this.sessions.get(sessionId);
-    if (session) {
-      session.channels.add(channel);
-    }
+    if (!session) return;
+    this.assertSessionScope(session, scope);
+    session.channels.add(channel);
   }
 
-  removeChannel(sessionId: string, channel: string): void {
+  removeChannel(sessionId: string, channel: string, scope: ActorTenantScope): void {
     const session = this.sessions.get(sessionId);
-    if (session) {
-      session.channels.delete(channel);
-    }
+    if (!session) return;
+    this.assertSessionScope(session, scope);
+    session.channels.delete(channel);
   }
 
-  async prompt(sessionId: string, message: string): Promise<void> {
+  async prompt(sessionId: string, message: string, scope: ActorTenantScope): Promise<void>;
+  async prompt(
+    sessionId: string,
+    message: string,
+    scope: ActorTenantScope,
+    attachments: readonly ChannelAttachmentDto[] | undefined,
+  ): Promise<void>;
+  async prompt(
+    sessionId: string,
+    message: string,
+    scope: ActorTenantScope,
+    attachments: readonly ChannelAttachmentDto[] = [],
+  ): Promise<void> {
     const session = this.sessions.get(sessionId);
     if (!session) {
       throw new Error(`No agent session found: ${sessionId}`);
     }
+    this.assertSessionScope(session, scope);
     session.promptCount += 1;
 
+    // Channel attachments are untrusted URI references. Preserve exact,
+    // authenticated metadata for the agent without treating it as authority.
+    const attachmentContext = this.attachmentContext(attachments);
+
     // Prepend session-scoped system override if present (renew TTL on each turn)
-    let effectiveMessage = message;
+    let effectiveMessage = `${message}${attachmentContext}`;
     if (this.systemOverride) {
-      const override = await this.systemOverride.get(sessionId);
+      const override = await this.systemOverride.get(sessionId, scope);
       if (override) {
-        effectiveMessage = `[System Override]\n${override}\n\n${message}`;
-        await this.systemOverride.renew(sessionId);
+        effectiveMessage = `[System Override]\n${override}\n\n${effectiveMessage}`;
+        await this.systemOverride.renew(sessionId, scope);
         this.logger.debug(`Applied system override for session ${sessionId}`);
       }
     }
@@ -629,16 +737,28 @@ export class AgentService implements OnModuleDestroy {
     }
   }
 
-  onEvent(sessionId: string, listener: (event: AgentSessionEvent) => void): () => void {
+  onEvent(
+    sessionId: string,
+    listener: (event: AgentSessionEvent) => void,
+    scope: ActorTenantScope,
+  ): () => void {
     const session = this.sessions.get(sessionId);
     if (!session) {
       throw new Error(`No agent session found: ${sessionId}`);
     }
+    this.assertSessionScope(session, scope);
     session.listeners.add(listener);
     return () => session.listeners.delete(listener);
   }
 
-  async destroySession(sessionId: string): Promise<void> {
+  async destroySession(sessionId: string, scope: ActorTenantScope): Promise<void> {
+    const session = this.sessions.get(sessionId);
+    if (!session) return;
+    this.assertSessionScope(session, scope);
+    await this.destroySessionForSystem(sessionId);
+  }
+
+  private async destroySessionForSystem(sessionId: string): Promise<void> {
     const session = this.sessions.get(sessionId);
     if (!session) return;
     this.logger.log(`Destroying agent session ${sessionId}`);
@@ -667,7 +787,7 @@ export class AgentService implements OnModuleDestroy {
 
   async onModuleDestroy(): Promise<void> {
     this.logger.log('Shutting down all agent sessions');
-    const stops = Array.from(this.sessions.keys()).map((id) => this.destroySession(id));
+    const stops = Array.from(this.sessions.keys()).map((id) => this.destroySessionForSystem(id));
     const results = await Promise.allSettled(stops);
     for (const result of results) {
       if (result.status === 'rejected') {

apps/gateway/src/agent/connector-lease.integration.test.ts

@@ -0,0 +1,341 @@
+import { mkdtemp, rm } from 'node:fs/promises';
+import { tmpdir } from 'node:os';
+import { join } from 'node:path';
+import { afterAll, beforeAll, describe, expect, it, vi } from 'vitest';
+import { Test, type TestingModule } from '@nestjs/testing';
+import {
+  connectorLeaseAuditLog,
+  createPgliteDb,
+  eq,
+  runPgliteMigrations,
+  type DbHandle,
+} from '@mosaicstack/db';
+import type { ConnectorExecutionContext, FencedConnectorAdapter } from '@mosaicstack/types';
+import { DB } from '../database/database.module.js';
+import { ConnectorLeaseRepository } from './connector-lease.repository.js';
+import {
+  CONNECTOR_LEASE_POLICY,
+  ConnectorLeaseService,
+  type ConnectorLeasePolicy,
+  type ConnectorLeasePolicySubject,
+} from './connector-lease.service.js';
+
+const authorize = vi.fn().mockResolvedValue(true);
+const policy: ConnectorLeasePolicy = { authorize };
+const context = {
+  actorScope: { userId: 'operator-a', tenantId: 'tenant-a' },
+  correlationId: 'correlation-acquire',
+};
+
+describe('gateway connector lease fencing integration', (): void => {
+  let dataDir: string;
+  let handle: DbHandle;
+  let moduleRef: TestingModule;
+  let service: ConnectorLeaseService;
+  let repository: ConnectorLeaseRepository;
+
+  beforeAll(async (): Promise<void> => {
+    vi.useFakeTimers();
+    vi.setSystemTime(new Date('2026-07-14T17:00:00.000Z'));
+    dataDir = await mkdtemp(join(tmpdir(), 'mosaic-gateway-connector-lease-'));
+    handle = createPgliteDb(dataDir);
+    await runPgliteMigrations(handle);
+    moduleRef = await Test.createTestingModule({
+      providers: [
+        ConnectorLeaseRepository,
+        ConnectorLeaseService,
+        { provide: DB, useValue: handle.db },
+        { provide: CONNECTOR_LEASE_POLICY, useValue: policy },
+      ],
+    }).compile();
+    service = moduleRef.get(ConnectorLeaseService);
+    repository = moduleRef.get(ConnectorLeaseRepository);
+  });
+
+  afterAll(async (): Promise<void> => {
+    vi.useRealTimers();
+    await moduleRef.close();
+    await handle.close();
+    await rm(dataDir, { recursive: true, force: true });
+  });
+
+  it('derives tenant authority at the gateway and validates a grant before side effects', async (): Promise<void> => {
+    const lease = await service.acquire(
+      {
+        logicalAgentId: 'Mos',
+        bindingId: 'operator-chat',
+        connectorId: 'pi-worker-a',
+        scopes: ['runtime.send'],
+        ttlMs: 60_000,
+      },
+      context,
+    );
+    const grant = await service.issueGrant(
+      { lease, scopes: ['runtime.send'], ttlMs: 30_000 },
+      { ...context, correlationId: 'correlation-grant' },
+    );
+    const execute = vi.fn(async (_message: string, leaseContext: ConnectorExecutionContext) => {
+      return leaseContext.leaseEpoch;
+    });
+    const adapter: FencedConnectorAdapter<string, string> = { execute };
+
+    await expect(service.executeGrant(grant, 'runtime.send', 'hello', adapter)).resolves.toBe('1');
+    expect(execute).toHaveBeenCalledOnce();
+    expect(authorize).toHaveBeenCalledWith(
+      expect.objectContaining({
+        action: 'grant.issue',
+        requestedScopes: ['runtime.send'],
+        requestedTtlMs: 30_000,
+      }),
+    );
+    expect(execute.mock.calls[0]?.[1]).toMatchObject({
+      identity: { tenantId: 'tenant-a', logicalAgentId: 'mos' },
+      bindingId: 'operator-chat',
+      connectorId: 'pi-worker-a',
+    });
+  });
+
+  it('normalizes lease-derived policy subjects before authorization', async (): Promise<void> => {
+    const lease = await service.acquire(
+      {
+        logicalAgentId: 'mos',
+        bindingId: 'operator-chat-policy',
+        connectorId: 'pi-worker-a',
+        scopes: ['runtime.send'],
+        ttlMs: 60_000,
+      },
+      { ...context, correlationId: 'correlation-policy-setup' },
+    );
+    const aliasedLease = {
+      ...lease,
+      identity: { ...lease.identity, logicalAgentId: ' MOS ' },
+      bindingId: ' Operator-Chat-Policy ',
+      connectorId: ' PI-Worker-A ',
+      scopes: [' Runtime.Send '],
+      leaseEpoch: `00${lease.leaseEpoch}`,
+    };
+
+    await service.heartbeat(aliasedLease, 30_000, {
+      ...context,
+      correlationId: 'correlation-policy-heartbeat',
+    });
+    expect(authorize).toHaveBeenLastCalledWith(
+      expect.objectContaining({
+        action: 'lease.heartbeat',
+        logicalAgentId: 'mos',
+        bindingId: 'operator-chat-policy',
+        connectorId: 'pi-worker-a',
+        requestedScopes: ['runtime.send'],
+      }),
+    );
+
+    await service.issueGrant(
+      { lease: aliasedLease, scopes: [' Runtime.Send '], ttlMs: 1_000 },
+      { ...context, correlationId: 'correlation-policy-grant' },
+    );
+    expect(authorize).toHaveBeenLastCalledWith(
+      expect.objectContaining({
+        action: 'grant.issue',
+        logicalAgentId: 'mos',
+        bindingId: 'operator-chat-policy',
+        connectorId: 'pi-worker-a',
+        requestedScopes: ['runtime.send'],
+      }),
+    );
+
+    await service.release(aliasedLease, {
+      ...context,
+      correlationId: 'correlation-policy-release',
+    });
+    expect(authorize).toHaveBeenLastCalledWith(
+      expect.objectContaining({
+        action: 'lease.release',
+        logicalAgentId: 'mos',
+        bindingId: 'operator-chat-policy',
+        connectorId: 'pi-worker-a',
+        requestedScopes: ['runtime.send'],
+      }),
+    );
+  });
+
+  it('denies stale, forged, expired, cross-tenant, and cross-binding grants before effects', async (): Promise<void> => {
+    const bindingId = 'operator-chat-denials';
+    const current = await service.acquire(
+      {
+        logicalAgentId: 'mos',
+        bindingId,
+        connectorId: 'pi-worker-a',
+        scopes: ['runtime.send'],
+        ttlMs: 60_000,
+      },
+      { ...context, correlationId: 'correlation-denial-setup' },
+    );
+    const stale = await service.issueGrant(
+      { lease: current, scopes: ['runtime.send'], ttlMs: 30_000 },
+      { ...context, correlationId: 'correlation-stale' },
+    );
+    await service.takeover(
+      {
+        logicalAgentId: 'mos',
+        bindingId,
+        connectorId: 'pi-worker-b',
+        scopes: ['runtime.send'],
+        ttlMs: 60_000,
+        expectedEpoch: current.leaseEpoch,
+      },
+      { ...context, correlationId: 'correlation-takeover' },
+    );
+    const adapter = { execute: vi.fn().mockResolvedValue(undefined) };
+
+    await expect(service.executeGrant(stale, 'runtime.send', undefined, adapter)).rejects.toThrow();
+
+    const active = await service.current('mos', bindingId, context);
+    if (!active) throw new Error('active lease fixture is unavailable');
+    const grant = await service.issueGrant(
+      { lease: active, scopes: ['runtime.send'], ttlMs: 1_000 },
+      { ...context, correlationId: 'correlation-active' },
+    );
+    await expect(
+      service.executeGrant({ ...grant }, 'runtime.send', undefined, adapter),
+    ).rejects.toThrow();
+    await expect(
+      service.executeGrant(
+        { ...grant, bindingId: 'other-binding' },
+        'runtime.send',
+        undefined,
+        adapter,
+      ),
+    ).rejects.toThrow();
+    await expect(
+      service.issueGrant(
+        { lease: active, scopes: ['runtime.send'], ttlMs: 30_000 },
+        {
+          actorScope: { userId: 'operator-b', tenantId: 'tenant-b' },
+          correlationId: 'correlation-cross-tenant',
+        },
+      ),
+    ).rejects.toThrow();
+    const crossTenantAudit = await handle.db
+      .select()
+      .from(connectorLeaseAuditLog)
+      .where(eq(connectorLeaseAuditLog.correlationId, 'correlation-cross-tenant'));
+    expect(crossTenantAudit).toHaveLength(1);
+    expect(crossTenantAudit[0]).toMatchObject({
+      tenantId: 'tenant-b',
+      logicalAgentId: 'untrusted',
+      bindingId: 'untrusted',
+      connectorId: 'untrusted',
+      reason: 'policy_denied',
+    });
+
+    vi.setSystemTime(new Date('2026-07-14T17:00:02.000Z'));
+    await expect(service.executeGrant(grant, 'runtime.send', undefined, adapter)).rejects.toThrow();
+    expect(adapter.execute).not.toHaveBeenCalled();
+  });
+
+  it('rejects submitted lifecycle scopes that differ from durable authority before policy or mutation', async (): Promise<void> => {
+    authorize.mockResolvedValue(true);
+    const heartbeatLease = await service.acquire(
+      {
+        logicalAgentId: 'mos',
+        bindingId: 'operator-chat-heartbeat-scope',
+        connectorId: 'pi-worker-a',
+        scopes: ['runtime.send'],
+        ttlMs: 60_000,
+      },
+      { ...context, correlationId: 'correlation-heartbeat-scope-setup' },
+    );
+    const releaseLease = await service.acquire(
+      {
+        logicalAgentId: 'mos',
+        bindingId: 'operator-chat-release-scope',
+        connectorId: 'pi-worker-a',
+        scopes: ['runtime.send'],
+        ttlMs: 60_000,
+      },
+      { ...context, correlationId: 'correlation-release-scope-setup' },
+    );
+    const forgedHeartbeat = { ...heartbeatLease, scopes: ['tool.execute'] };
+    const forgedRelease = { ...releaseLease, scopes: ['tool.execute'] };
+
+    authorize.mockImplementation(async (subject: ConnectorLeasePolicySubject) => {
+      return subject.requestedScopes.length === 1 && subject.requestedScopes[0] === 'tool.execute';
+    });
+    authorize.mockClear();
+
+    await expect(
+      service.heartbeat(forgedHeartbeat, 30_000, {
+        ...context,
+        correlationId: 'correlation-heartbeat-scope-forgery',
+      }),
+    ).rejects.toThrow('Connector authority policy denied');
+    await expect(
+      service.release(forgedRelease, {
+        ...context,
+        correlationId: 'correlation-release-scope-forgery',
+      }),
+    ).rejects.toThrow('Connector authority policy denied');
+    expect(authorize).not.toHaveBeenCalled();
+
+    const currentHeartbeat = await repository.findCurrent({
+      identity: heartbeatLease.identity,
+      bindingId: heartbeatLease.bindingId,
+    });
+    const currentRelease = await repository.findCurrent({
+      identity: releaseLease.identity,
+      bindingId: releaseLease.bindingId,
+    });
+    expect(currentHeartbeat).toMatchObject({
+      leaseId: heartbeatLease.leaseId,
+      scopes: ['runtime.send'],
+      heartbeatAt: heartbeatLease.heartbeatAt,
+      expiresAt: heartbeatLease.expiresAt,
+    });
+    expect(currentRelease).toMatchObject({
+      leaseId: releaseLease.leaseId,
+      scopes: ['runtime.send'],
+    });
+    expect(currentRelease?.releasedAt).toBeUndefined();
+
+    const forgedAudits = await handle.db
+      .select()
+      .from(connectorLeaseAuditLog)
+      .where(eq(connectorLeaseAuditLog.correlationId, 'correlation-heartbeat-scope-forgery'));
+    expect(forgedAudits).toHaveLength(1);
+    expect(forgedAudits[0]).toMatchObject({
+      bindingId: heartbeatLease.bindingId,
+      connectorId: heartbeatLease.connectorId,
+      event: 'reject',
+      outcome: 'denied',
+      reason: 'policy_denied',
+    });
+    const forgedReleaseAudits = await handle.db
+      .select()
+      .from(connectorLeaseAuditLog)
+      .where(eq(connectorLeaseAuditLog.correlationId, 'correlation-release-scope-forgery'));
+    expect(forgedReleaseAudits).toHaveLength(1);
+    expect(forgedReleaseAudits[0]).toMatchObject({
+      bindingId: releaseLease.bindingId,
+      connectorId: releaseLease.connectorId,
+      event: 'reject',
+      outcome: 'denied',
+      reason: 'policy_denied',
+    });
+
+    authorize.mockImplementation(async (subject: ConnectorLeasePolicySubject) => {
+      return subject.requestedScopes.length === 1 && subject.requestedScopes[0] === 'runtime.send';
+    });
+    await expect(
+      service.heartbeat(heartbeatLease, 30_000, {
+        ...context,
+        correlationId: 'correlation-heartbeat-scope-canonical',
+      }),
+    ).resolves.toMatchObject({ scopes: ['runtime.send'] });
+    await expect(
+      service.release(releaseLease, {
+        ...context,
+        correlationId: 'correlation-release-scope-canonical',
+      }),
+    ).resolves.toBeUndefined();
+  });
+});

apps/gateway/src/agent/connector-lease.postgres.integration.test.ts

@@ -0,0 +1,76 @@
+import { randomUUID } from 'node:crypto';
+import { afterAll, beforeAll, describe, expect, it } from 'vitest';
+import {
+  connectorLeaseAuditLog,
+  createDb,
+  eq,
+  logicalAgentConnectorLeases,
+  type DbHandle,
+} from '@mosaicstack/db';
+import { ConnectorLeaseCoordinator } from '@mosaicstack/agent';
+import { ConnectorLeaseRepository } from './connector-lease.repository.js';
+
+const hasPostgres = Boolean(process.env['DATABASE_URL']);
+const tenantId = `lease-test-${randomUUID()}`;
+const identity = { tenantId, logicalAgentId: 'mos' } as const;
+
+describe.skipIf(!hasPostgres)('ConnectorLeaseRepository real PostgreSQL integration', (): void => {
+  let handle: DbHandle;
+
+  beforeAll((): void => {
+    handle = createDb(process.env['DATABASE_URL']);
+  });
+
+  afterAll(async (): Promise<void> => {
+    if (!handle) return;
+    await handle.db
+      .delete(connectorLeaseAuditLog)
+      .where(eq(connectorLeaseAuditLog.tenantId, tenantId));
+    await handle.db
+      .delete(logicalAgentConnectorLeases)
+      .where(eq(logicalAgentConnectorLeases.tenantId, tenantId));
+    await handle.close();
+  });
+
+  it('preserves the exclusive CAS fence across a real pool close/reopen', async (): Promise<void> => {
+    const command = {
+      identity,
+      bindingId: 'operator-chat',
+      scopes: ['runtime.send'],
+      ttlMs: 60_000,
+    } as const;
+    const firstCoordinator = new ConnectorLeaseCoordinator(new ConnectorLeaseRepository(handle.db));
+    const contenders = await Promise.allSettled([
+      firstCoordinator.acquire({
+        ...command,
+        connectorId: 'connector-a',
+        correlationId: 'postgres-acquire-a',
+      }),
+      firstCoordinator.acquire({
+        ...command,
+        connectorId: 'connector-b',
+        correlationId: 'postgres-acquire-b',
+      }),
+    ]);
+    const acquired = contenders.find((result) => result.status === 'fulfilled');
+    if (!acquired || acquired.status !== 'fulfilled') throw new Error('no lease contender won');
+    expect(contenders.filter((result) => result.status === 'fulfilled')).toHaveLength(1);
+
+    await handle.close();
+    handle = createDb(process.env['DATABASE_URL']);
+    const reopened = new ConnectorLeaseCoordinator(new ConnectorLeaseRepository(handle.db));
+    const persisted = await reopened.current({ identity, bindingId: 'operator-chat' });
+    expect(persisted).toMatchObject({
+      leaseId: acquired.value.leaseId,
+      leaseEpoch: '1',
+    });
+
+    const takeover = await reopened.takeover({
+      ...command,
+      connectorId: 'connector-c',
+      correlationId: 'postgres-takeover',
+      expectedEpoch: acquired.value.leaseEpoch,
+    });
+    expect(takeover).toMatchObject({ connectorId: 'connector-c', leaseEpoch: '2' });
+  });
+});

apps/gateway/src/agent/connector-lease.repository.test.ts

@@ -0,0 +1,149 @@
+import { mkdtemp, rm } from 'node:fs/promises';
+import { tmpdir } from 'node:os';
+import { join } from 'node:path';
+import { afterEach, beforeEach, describe, expect, it } from 'vitest';
+import {
+  connectorLeaseAuditLog,
+  createPgliteDb,
+  eq,
+  runPgliteMigrations,
+  type DbHandle,
+} from '@mosaicstack/db';
+import { ConnectorLeaseCoordinator, ConnectorLeaseError } from '@mosaicstack/agent';
+import { ConnectorLeaseRepository } from './connector-lease.repository.js';
+
+const identity = { tenantId: 'tenant-a', logicalAgentId: 'mos' } as const;
+
+function acquireCommand(connectorId: string, correlationId: string) {
+  return {
+    identity,
+    bindingId: 'operator-chat',
+    connectorId,
+    scopes: ['runtime.send', 'tool.execute'],
+    ttlMs: 60_000,
+    correlationId,
+  };
+}
+
+describe('ConnectorLeaseRepository PostgreSQL semantics', (): void => {
+  let dataDir: string;
+  let handle: DbHandle;
+  let now: Date;
+  let coordinator: ConnectorLeaseCoordinator;
+
+  beforeEach(async (): Promise<void> => {
+    dataDir = await mkdtemp(join(tmpdir(), 'mosaic-connector-lease-'));
+    handle = createPgliteDb(dataDir);
+    await runPgliteMigrations(handle);
+    now = new Date('2026-07-14T17:00:00.000Z');
+    coordinator = new ConnectorLeaseCoordinator(new ConnectorLeaseRepository(handle.db), {
+      now: (): Date => now,
+    });
+  });
+
+  afterEach(async (): Promise<void> => {
+    await handle.close();
+    await rm(dataDir, { recursive: true, force: true });
+  });
+
+  it('allows only one concurrent contender to acquire a binding', async (): Promise<void> => {
+    const outcomes = await Promise.allSettled([
+      coordinator.acquire(acquireCommand('connector-a', 'correlation-a')),
+      coordinator.acquire(acquireCommand('connector-b', 'correlation-b')),
+    ]);
+
+    expect(outcomes.filter((result) => result.status === 'fulfilled')).toHaveLength(1);
+    const rejected = outcomes.find((result) => result.status === 'rejected');
+    expect(rejected).toMatchObject({
+      reason: { code: 'lease_held' } satisfies Partial<ConnectorLeaseError>,
+    });
+  });
+
+  it('uses compare-and-swap takeover and increments the fencing epoch monotonically', async (): Promise<void> => {
+    const acquired = await coordinator.acquire(acquireCommand('connector-a', 'correlation-a'));
+    const results = await Promise.allSettled([
+      coordinator.takeover({
+        ...acquireCommand('connector-b', 'correlation-b'),
+        expectedEpoch: acquired.leaseEpoch,
+      }),
+      coordinator.takeover({
+        ...acquireCommand('connector-c', 'correlation-c'),
+        expectedEpoch: acquired.leaseEpoch,
+      }),
+    ]);
+    const winner = results.find((result) => result.status === 'fulfilled');
+
+    expect(results.filter((result) => result.status === 'fulfilled')).toHaveLength(1);
+    expect(winner?.status === 'fulfilled' ? winner.value.leaseEpoch : null).toBe('2');
+    expect(results.find((result) => result.status === 'rejected')).toMatchObject({
+      reason: { code: 'cas_mismatch' } satisfies Partial<ConnectorLeaseError>,
+    });
+  });
+
+  it('heartbeats and releases only the current connector epoch', async (): Promise<void> => {
+    const acquired = await coordinator.acquire(acquireCommand('connector-a', 'correlation-a'));
+    now = new Date('2026-07-14T17:00:30.000Z');
+    const renewed = await coordinator.heartbeat({
+      lease: acquired,
+      ttlMs: 120_000,
+      correlationId: 'correlation-renew',
+    });
+    expect(renewed.expiresAt).toBe('2026-07-14T17:02:30.000Z');
+
+    await coordinator.release({ lease: renewed, correlationId: 'correlation-release' });
+    await expect(
+      coordinator.heartbeat({
+        lease: renewed,
+        ttlMs: 120_000,
+        correlationId: 'correlation-stale',
+      }),
+    ).rejects.toMatchObject({ code: 'lease_released' } satisfies Partial<ConnectorLeaseError>);
+  });
+
+  it('survives close/reopen and requires CAS takeover to recover an expired lease', async (): Promise<void> => {
+    const acquired = await coordinator.acquire(acquireCommand('connector-a', 'correlation-a'));
+    await handle.close();
+
+    now = new Date('2026-07-14T17:02:00.000Z');
+    handle = createPgliteDb(dataDir);
+    await runPgliteMigrations(handle);
+    coordinator = new ConnectorLeaseCoordinator(new ConnectorLeaseRepository(handle.db), {
+      now: (): Date => now,
+    });
+
+    await expect(
+      coordinator.acquire(acquireCommand('connector-b', 'correlation-plain-acquire')),
+    ).rejects.toMatchObject({ code: 'takeover_required' } satisfies Partial<ConnectorLeaseError>);
+    const recovered = await coordinator.takeover({
+      ...acquireCommand('connector-b', 'correlation-takeover'),
+      expectedEpoch: acquired.leaseEpoch,
+    });
+    expect(recovered).toMatchObject({ connectorId: 'connector-b', leaseEpoch: '2' });
+  });
+
+  it('writes credential-safe lifecycle and rejection audit records', async (): Promise<void> => {
+    const acquired = await coordinator.acquire(acquireCommand('connector-a', 'correlation-a'));
+    await coordinator.heartbeat({
+      lease: acquired,
+      ttlMs: 60_000,
+      correlationId: 'correlation-renew',
+    });
+    await expect(
+      coordinator.acquire(acquireCommand('connector-b', 'correlation-reject')),
+    ).rejects.toBeInstanceOf(ConnectorLeaseError);
+
+    const rows = await handle.db
+      .select()
+      .from(connectorLeaseAuditLog)
+      .where(eq(connectorLeaseAuditLog.tenantId, identity.tenantId));
+    expect(rows.map((row) => row.event)).toEqual(
+      expect.arrayContaining(['acquire', 'renew', 'reject']),
+    );
+    const serialized = JSON.stringify(rows, (_key: string, value: unknown): unknown =>
+      typeof value === 'bigint' ? value.toString(10) : value,
+    );
+    expect(serialized).not.toContain('tool.execute');
+    expect(serialized).not.toContain('runtime.send');
+    expect(serialized).not.toMatch(/token|secret|credential/i);
+  });
+});

apps/gateway/src/agent/connector-lease.repository.ts

@@ -0,0 +1,354 @@
+import { Inject, Injectable } from '@nestjs/common';
+import {
+  and,
+  connectorLeaseAuditLog,
+  eq,
+  gt,
+  isNull,
+  logicalAgentConnectorLeases,
+  sql,
+  type Db,
+} from '@mosaicstack/db';
+import { ConnectorLeaseError } from '@mosaicstack/agent';
+import type {
+  ConnectorLease,
+  ConnectorLeaseAcquireMutation,
+  ConnectorLeaseAuditEvent,
+  ConnectorLeaseHeartbeatMutation,
+  ConnectorLeaseRejectReason,
+  ConnectorLeaseReleaseMutation,
+  ConnectorLeaseStore,
+  ConnectorLeaseTakeoverMutation,
+  LogicalAgentBinding,
+} from '@mosaicstack/types';
+import { DB } from '../database/database.module.js';
+
+interface SuccessfulMutation {
+  readonly ok: true;
+  readonly lease: ConnectorLease;
+}
+
+interface FailedMutation {
+  readonly ok: false;
+  readonly reason: ConnectorLeaseRejectReason;
+}
+
+type MutationResult = SuccessfulMutation | FailedMutation;
+
+@Injectable()
+export class ConnectorLeaseRepository implements ConnectorLeaseStore {
+  constructor(@Inject(DB) private readonly db: Db) {}
+
+  async acquire(input: ConnectorLeaseAcquireMutation): Promise<ConnectorLease> {
+    const result: MutationResult = await this.db.transaction(
+      async (tx): Promise<MutationResult> => {
+        const inserted = await tx
+          .insert(logicalAgentConnectorLeases)
+          .values({
+            leaseId: input.leaseId,
+            tenantId: input.identity.tenantId,
+            logicalAgentId: input.identity.logicalAgentId,
+            bindingId: input.bindingId,
+            connectorId: input.connectorId,
+            scopes: [...input.scopes],
+            leaseEpoch: 1n,
+            acquiredAt: new Date(input.now),
+            heartbeatAt: new Date(input.now),
+            expiresAt: new Date(input.expiresAt),
+            updatedAt: new Date(input.now),
+          })
+          .onConflictDoNothing()
+          .returning();
+        const row = inserted[0];
+        if (row) {
+          const lease = toLease(row);
+          await insertAudit(tx, lifecycleAudit(input, lease, 'acquire'));
+          return { ok: true, lease };
+        }
+
+        const current = await findRow(tx, input);
+        if (current && current.expiresAt <= new Date(input.now) && !current.releasedAt) {
+          await insertAudit(tx, lifecycleAudit(input, toLease(current), 'expiry'));
+        }
+        const reason: ConnectorLeaseRejectReason =
+          current && (current.releasedAt || current.expiresAt <= new Date(input.now))
+            ? 'takeover_required'
+            : 'lease_held';
+        await insertAudit(tx, rejectionAudit(input, current ? toLease(current) : null, reason));
+        return { ok: false, reason };
+      },
+    );
+    return unwrap(result);
+  }
+
+  async takeover(input: ConnectorLeaseTakeoverMutation): Promise<ConnectorLease> {
+    const result: MutationResult = await this.db.transaction(
+      async (tx): Promise<MutationResult> => {
+        const current = await findRow(tx, input);
+        if (!current || current.leaseEpoch.toString(10) !== input.expectedEpoch) {
+          await insertAudit(
+            tx,
+            rejectionAudit(input, current ? toLease(current) : null, 'cas_mismatch'),
+          );
+          return { ok: false, reason: 'cas_mismatch' };
+        }
+        if (current.expiresAt <= new Date(input.now) && !current.releasedAt) {
+          await insertAudit(tx, lifecycleAudit(input, toLease(current), 'expiry'));
+        }
+        const updated = await tx
+          .update(logicalAgentConnectorLeases)
+          .set({
+            leaseId: input.leaseId,
+            connectorId: input.connectorId,
+            scopes: [...input.scopes],
+            leaseEpoch: sql`${logicalAgentConnectorLeases.leaseEpoch} + 1`,
+            acquiredAt: new Date(input.now),
+            heartbeatAt: new Date(input.now),
+            expiresAt: new Date(input.expiresAt),
+            releasedAt: null,
+            updatedAt: new Date(input.now),
+          })
+          .where(
+            and(
+              bindingPredicate(input),
+              eq(logicalAgentConnectorLeases.leaseId, current.leaseId),
+              eq(logicalAgentConnectorLeases.leaseEpoch, BigInt(input.expectedEpoch)),
+            ),
+          )
+          .returning();
+        const row = updated[0];
+        if (!row) {
+          await insertAudit(tx, rejectionAudit(input, toLease(current), 'cas_mismatch'));
+          return { ok: false, reason: 'cas_mismatch' };
+        }
+        const lease = toLease(row);
+        await insertAudit(tx, lifecycleAudit(input, lease, 'takeover'));
+        return { ok: true, lease };
+      },
+    );
+    return unwrap(result);
+  }
+
+  async heartbeat(input: ConnectorLeaseHeartbeatMutation): Promise<ConnectorLease> {
+    const result: MutationResult = await this.db.transaction(
+      async (tx): Promise<MutationResult> => {
+        const updated = await tx
+          .update(logicalAgentConnectorLeases)
+          .set({
+            heartbeatAt: new Date(input.now),
+            expiresAt: new Date(input.expiresAt),
+            updatedAt: new Date(input.now),
+          })
+          .where(
+            and(
+              bindingPredicate(input.lease),
+              eq(logicalAgentConnectorLeases.leaseId, input.lease.leaseId),
+              eq(logicalAgentConnectorLeases.connectorId, input.lease.connectorId),
+              eq(logicalAgentConnectorLeases.leaseEpoch, BigInt(input.lease.leaseEpoch)),
+              isNull(logicalAgentConnectorLeases.releasedAt),
+              gt(logicalAgentConnectorLeases.expiresAt, new Date(input.now)),
+            ),
+          )
+          .returning();
+        const row = updated[0];
+        if (row) {
+          const lease = toLease(row);
+          await insertAudit(tx, lifecycleAudit(input, lease, 'renew'));
+          return { ok: true, lease };
+        }
+        const current = await findRow(tx, input.lease);
+        const reason = classifyAuthorityFailure(
+          current ? toLease(current) : null,
+          input.lease,
+          input.now,
+        );
+        if (reason === 'lease_expired' && current) {
+          await insertAudit(tx, lifecycleAudit(input, toLease(current), 'expiry'));
+        }
+        await insertAudit(
+          tx,
+          rejectionAudit(
+            { ...input.lease, correlationId: input.correlationId, now: input.now },
+            current ? toLease(current) : null,
+            reason,
+          ),
+        );
+        return { ok: false, reason };
+      },
+    );
+    return unwrap(result);
+  }
+
+  async release(input: ConnectorLeaseReleaseMutation): Promise<void> {
+    const result: MutationResult = await this.db.transaction(
+      async (tx): Promise<MutationResult> => {
+        const updated = await tx
+          .update(logicalAgentConnectorLeases)
+          .set({
+            releasedAt: new Date(input.now),
+            expiresAt: new Date(input.now),
+            updatedAt: new Date(input.now),
+          })
+          .where(
+            and(
+              bindingPredicate(input.lease),
+              eq(logicalAgentConnectorLeases.leaseId, input.lease.leaseId),
+              eq(logicalAgentConnectorLeases.connectorId, input.lease.connectorId),
+              eq(logicalAgentConnectorLeases.leaseEpoch, BigInt(input.lease.leaseEpoch)),
+              isNull(logicalAgentConnectorLeases.releasedAt),
+              gt(logicalAgentConnectorLeases.expiresAt, new Date(input.now)),
+            ),
+          )
+          .returning();
+        const row = updated[0];
+        if (row) {
+          const lease = toLease(row);
+          await insertAudit(tx, lifecycleAudit(input, lease, 'release'));
+          return { ok: true, lease };
+        }
+        const current = await findRow(tx, input.lease);
+        const reason = classifyAuthorityFailure(
+          current ? toLease(current) : null,
+          input.lease,
+          input.now,
+        );
+        if (reason === 'lease_expired' && current) {
+          await insertAudit(tx, lifecycleAudit(input, toLease(current), 'expiry'));
+        }
+        await insertAudit(
+          tx,
+          rejectionAudit(
+            { ...input.lease, correlationId: input.correlationId, now: input.now },
+            current ? toLease(current) : null,
+            reason,
+          ),
+        );
+        return { ok: false, reason };
+      },
+    );
+    unwrap(result);
+  }
+
+  async findCurrent(binding: LogicalAgentBinding): Promise<ConnectorLease | null> {
+    const row = await findRow(this.db, binding);
+    return row ? toLease(row) : null;
+  }
+
+  async recordAudit(event: ConnectorLeaseAuditEvent): Promise<void> {
+    await insertAudit(this.db, event);
+  }
+}
+
+function unwrap(result: MutationResult): ConnectorLease {
+  if (!result.ok) throw new ConnectorLeaseError(result.reason, safeErrorMessage(result.reason));
+  return result.lease;
+}
+
+function safeErrorMessage(reason: ConnectorLeaseRejectReason): string {
+  return `Connector lease mutation denied: ${reason}`;
+}
+
+function bindingPredicate(binding: LogicalAgentBinding) {
+  return and(
+    eq(logicalAgentConnectorLeases.tenantId, binding.identity.tenantId),
+    eq(logicalAgentConnectorLeases.logicalAgentId, binding.identity.logicalAgentId),
+    eq(logicalAgentConnectorLeases.bindingId, binding.bindingId),
+  );
+}
+
+async function findRow(
+  db: Pick<Db, 'select'>,
+  binding: LogicalAgentBinding,
+): Promise<typeof logicalAgentConnectorLeases.$inferSelect | null> {
+  const rows = await db
+    .select()
+    .from(logicalAgentConnectorLeases)
+    .where(bindingPredicate(binding))
+    .limit(1);
+  return rows[0] ?? null;
+}
+
+function toLease(row: typeof logicalAgentConnectorLeases.$inferSelect): ConnectorLease {
+  return Object.freeze({
+    identity: Object.freeze({ tenantId: row.tenantId, logicalAgentId: row.logicalAgentId }),
+    bindingId: row.bindingId,
+    leaseId: row.leaseId,
+    connectorId: row.connectorId,
+    scopes: Object.freeze([...row.scopes]),
+    leaseEpoch: row.leaseEpoch.toString(10),
+    acquiredAt: row.acquiredAt.toISOString(),
+    heartbeatAt: row.heartbeatAt.toISOString(),
+    expiresAt: row.expiresAt.toISOString(),
+    ...(row.releasedAt ? { releasedAt: row.releasedAt.toISOString() } : {}),
+  });
+}
+
+function classifyAuthorityFailure(
+  current: ConnectorLease | null,
+  claimed: ConnectorLease,
+  now: string,
+): ConnectorLeaseRejectReason {
+  if (!current) return 'lease_missing';
+  if (current.releasedAt) return 'lease_released';
+  if (new Date(current.expiresAt) <= new Date(now)) return 'lease_expired';
+  if (current.leaseEpoch !== claimed.leaseEpoch) return 'stale_epoch';
+  return 'connector_mismatch';
+}
+
+function lifecycleAudit(
+  input: { readonly correlationId: string; readonly now: string },
+  lease: ConnectorLease,
+  event: Exclude<ConnectorLeaseAuditEvent['event'], 'reject'>,
+): ConnectorLeaseAuditEvent {
+  return {
+    identity: lease.identity,
+    bindingId: lease.bindingId,
+    connectorId: lease.connectorId,
+    leaseId: lease.leaseId,
+    leaseEpoch: lease.leaseEpoch,
+    event,
+    outcome: 'succeeded',
+    correlationId: input.correlationId,
+    occurredAt: input.now,
+  };
+}
+
+function rejectionAudit(
+  input: {
+    readonly identity: ConnectorLease['identity'];
+    readonly bindingId: string;
+    readonly connectorId: string;
+    readonly correlationId: string;
+    readonly now: string;
+  },
+  current: ConnectorLease | null,
+  reason: ConnectorLeaseRejectReason,
+): ConnectorLeaseAuditEvent {
+  return {
+    identity: input.identity,
+    bindingId: input.bindingId,
+    connectorId: input.connectorId,
+    event: 'reject',
+    outcome: 'denied',
+    correlationId: input.correlationId,
+    occurredAt: input.now,
+    ...(current ? { leaseId: current.leaseId, leaseEpoch: current.leaseEpoch } : {}),
+    reason,
+  };
+}
+
+async function insertAudit(db: Pick<Db, 'insert'>, event: ConnectorLeaseAuditEvent): Promise<void> {
+  await db.insert(connectorLeaseAuditLog).values({
+    tenantId: event.identity.tenantId,
+    logicalAgentId: event.identity.logicalAgentId,
+    bindingId: event.bindingId,
+    connectorId: event.connectorId,
+    ...(event.leaseId ? { leaseId: event.leaseId } : {}),
+    ...(event.leaseEpoch ? { leaseEpoch: BigInt(event.leaseEpoch) } : {}),
+    event: event.event,
+    outcome: event.outcome,
+    ...(event.reason ? { reason: event.reason } : {}),
+    correlationId: event.correlationId,
+    occurredAt: new Date(event.occurredAt),
+  });
+}

apps/gateway/src/agent/connector-lease.service.ts

@@ -0,0 +1,285 @@
+import { ForbiddenException, Inject, Injectable } from '@nestjs/common';
+import { ConnectorLeaseCoordinator, normalizeConnectorLease } from '@mosaicstack/agent';
+import {
+  normalizeConnectorId,
+  normalizeConnectorScopes,
+  normalizeCorrelationId,
+  normalizeLogicalAgentIdentity,
+  normalizeLogicalBindingId,
+  type AcquireConnectorLeaseInput,
+  type ConnectorExecutionGrant,
+  type ConnectorLease,
+  type ConnectorLeaseAuditEvent,
+  type FencedConnectorAdapter,
+} from '@mosaicstack/types';
+import type { ActorTenantScope } from '../auth/session-scope.js';
+import { ConnectorLeaseRepository } from './connector-lease.repository.js';
+
+export const CONNECTOR_LEASE_POLICY = Symbol('CONNECTOR_LEASE_POLICY');
+
+export type ConnectorLeasePolicyAction =
+  | 'lease.acquire'
+  | 'lease.takeover'
+  | 'lease.heartbeat'
+  | 'lease.release'
+  | 'lease.read'
+  | 'grant.issue';
+
+export interface ConnectorLeaseRequestContext {
+  readonly actorScope: ActorTenantScope;
+  readonly correlationId: string;
+}
+
+export interface GatewayConnectorLeaseRequest {
+  readonly logicalAgentId: string;
+  readonly bindingId: string;
+  readonly connectorId: string;
+  readonly scopes: readonly string[];
+  readonly ttlMs: number;
+}
+
+export interface GatewayConnectorLeaseTakeoverRequest extends GatewayConnectorLeaseRequest {
+  readonly expectedEpoch: string;
+}
+
+export interface GatewayConnectorGrantRequest {
+  readonly lease: ConnectorLease;
+  readonly scopes: readonly string[];
+  readonly ttlMs: number;
+}
+
+export interface ConnectorLeasePolicySubject {
+  readonly action: ConnectorLeasePolicyAction;
+  readonly actorId: string;
+  readonly tenantId: string;
+  readonly logicalAgentId: string;
+  readonly bindingId: string;
+  readonly connectorId: string;
+  readonly requestedScopes: readonly string[];
+  readonly requestedTtlMs: number | null;
+}
+
+export interface ConnectorLeasePolicy {
+  authorize(subject: ConnectorLeasePolicySubject): Promise<boolean>;
+}
+
+/** M1 has no concrete cutover policy: unconfigured production use fails closed. */
+@Injectable()
+export class DenyConnectorLeasePolicy implements ConnectorLeasePolicy {
+  async authorize(_subject: ConnectorLeasePolicySubject): Promise<boolean> {
+    return false;
+  }
+}
+
+/** Gateway-owned policy surface for durable connector authority and fenced effects. */
+@Injectable()
+export class ConnectorLeaseService {
+  private readonly coordinator: ConnectorLeaseCoordinator;
+
+  constructor(
+    @Inject(ConnectorLeaseRepository) private readonly repository: ConnectorLeaseRepository,
+    @Inject(CONNECTOR_LEASE_POLICY) private readonly policy: ConnectorLeasePolicy,
+  ) {
+    this.coordinator = new ConnectorLeaseCoordinator(repository);
+  }
+
+  async acquire(
+    request: GatewayConnectorLeaseRequest,
+    context: ConnectorLeaseRequestContext,
+  ): Promise<ConnectorLease> {
+    const command = this.command(request, context);
+    await this.assertPolicy('lease.acquire', command, context, command.scopes, command.ttlMs);
+    return this.coordinator.acquire({ ...command, correlationId: this.correlation(context) });
+  }
+
+  async takeover(
+    request: GatewayConnectorLeaseTakeoverRequest,
+    context: ConnectorLeaseRequestContext,
+  ): Promise<ConnectorLease> {
+    const command = this.command(request, context);
+    await this.assertPolicy('lease.takeover', command, context, command.scopes, command.ttlMs);
+    return this.coordinator.takeover({
+      ...command,
+      expectedEpoch: request.expectedEpoch,
+      correlationId: this.correlation(context),
+    });
+  }
+
+  async heartbeat(
+    lease: ConnectorLease,
+    ttlMs: number,
+    context: ConnectorLeaseRequestContext,
+  ): Promise<ConnectorLease> {
+    const normalizedLease = normalizeConnectorLease(lease);
+    const durableLease = await this.durableLifecycleLease(normalizedLease, context);
+    await this.assertPolicy('lease.heartbeat', durableLease, context, durableLease.scopes, ttlMs);
+    return this.coordinator.heartbeat({
+      lease: durableLease,
+      ttlMs,
+      correlationId: this.correlation(context),
+    });
+  }
+
+  async release(lease: ConnectorLease, context: ConnectorLeaseRequestContext): Promise<void> {
+    const normalizedLease = normalizeConnectorLease(lease);
+    const durableLease = await this.durableLifecycleLease(normalizedLease, context);
+    await this.assertPolicy('lease.release', durableLease, context, durableLease.scopes, null);
+    await this.coordinator.release({
+      lease: durableLease,
+      correlationId: this.correlation(context),
+    });
+  }
+
+  async current(
+    logicalAgentId: string,
+    bindingId: string,
+    context: ConnectorLeaseRequestContext,
+  ): Promise<ConnectorLease | null> {
+    const binding = {
+      identity: normalizeLogicalAgentIdentity({
+        tenantId: context.actorScope.tenantId,
+        logicalAgentId,
+      }),
+      bindingId: normalizeLogicalBindingId(bindingId),
+      connectorId: 'gateway',
+    };
+    await this.assertPolicy('lease.read', binding, context, [], null);
+    return this.coordinator.current(binding);
+  }
+
+  async issueGrant(
+    request: GatewayConnectorGrantRequest,
+    context: ConnectorLeaseRequestContext,
+  ): Promise<ConnectorExecutionGrant> {
+    const lease = normalizeConnectorLease(request.lease);
+    await this.assertTenant(lease, context);
+    const scopes = normalizeConnectorScopes(request.scopes);
+    await this.assertPolicy('grant.issue', lease, context, scopes, request.ttlMs);
+    return this.coordinator.issueGrant({
+      lease,
+      scopes,
+      ttlMs: request.ttlMs,
+      correlationId: this.correlation(context),
+    });
+  }
+
+  async executeGrant<TInput, TOutput>(
+    grant: ConnectorExecutionGrant,
+    requiredScope: string,
+    input: TInput,
+    adapter: FencedConnectorAdapter<TInput, TOutput>,
+  ): Promise<TOutput> {
+    return this.coordinator.executeGrant(grant, requiredScope, input, adapter);
+  }
+
+  private command(
+    request: GatewayConnectorLeaseRequest,
+    context: ConnectorLeaseRequestContext,
+  ): Omit<AcquireConnectorLeaseInput, 'correlationId'> {
+    return {
+      identity: normalizeLogicalAgentIdentity({
+        tenantId: context.actorScope.tenantId,
+        logicalAgentId: request.logicalAgentId,
+      }),
+      bindingId: normalizeLogicalBindingId(request.bindingId),
+      connectorId: normalizeConnectorId(request.connectorId),
+      scopes: normalizeConnectorScopes(request.scopes),
+      ttlMs: request.ttlMs,
+    };
+  }
+
+  private async assertTenant(
+    lease: Pick<ConnectorLease, 'identity' | 'bindingId' | 'connectorId'>,
+    context: ConnectorLeaseRequestContext,
+  ): Promise<void> {
+    if (lease.identity.tenantId !== context.actorScope.tenantId) {
+      await this.recordPolicyDenial(
+        {
+          identity: {
+            tenantId: context.actorScope.tenantId,
+            logicalAgentId: 'untrusted',
+          },
+          bindingId: 'untrusted',
+          connectorId: 'untrusted',
+        },
+        context,
+      );
+      throw new ForbiddenException('Connector authority tenant scope denied');
+    }
+  }
+
+  private async durableLifecycleLease(
+    submittedLease: ConnectorLease,
+    context: ConnectorLeaseRequestContext,
+  ): Promise<ConnectorLease> {
+    await this.assertTenant(submittedLease, context);
+    const durableLease = await this.coordinator.current(submittedLease);
+    if (!durableLease || !hasSameLifecycleAuthority(submittedLease, durableLease)) {
+      await this.recordPolicyDenial(durableLease ?? submittedLease, context);
+      throw new ForbiddenException('Connector authority policy denied');
+    }
+    return durableLease;
+  }
+
+  private async assertPolicy(
+    action: ConnectorLeasePolicyAction,
+    subject: Pick<ConnectorLease, 'identity' | 'bindingId' | 'connectorId'>,
+    context: ConnectorLeaseRequestContext,
+    requestedScopes: readonly string[],
+    requestedTtlMs: number | null,
+  ): Promise<void> {
+    const allowed = await this.policy.authorize({
+      action,
+      actorId: context.actorScope.userId,
+      tenantId: subject.identity.tenantId,
+      logicalAgentId: subject.identity.logicalAgentId,
+      bindingId: subject.bindingId,
+      connectorId: subject.connectorId,
+      requestedScopes: Object.freeze([...requestedScopes]),
+      requestedTtlMs,
+    });
+    if (!allowed) {
+      await this.recordPolicyDenial(subject, context);
+      throw new ForbiddenException('Connector authority policy denied');
+    }
+  }
+
+  private async recordPolicyDenial(
+    subject: Pick<ConnectorLease, 'identity' | 'bindingId' | 'connectorId'>,
+    context: ConnectorLeaseRequestContext,
+  ): Promise<void> {
+    const event: ConnectorLeaseAuditEvent = {
+      identity: subject.identity,
+      bindingId: subject.bindingId,
+      connectorId: subject.connectorId,
+      event: 'reject',
+      outcome: 'denied',
+      reason: 'policy_denied',
+      correlationId: this.correlation(context),
+      occurredAt: new Date().toISOString(),
+    };
+    await this.repository.recordAudit(event);
+  }
+
+  private correlation(context: ConnectorLeaseRequestContext): string {
+    return normalizeCorrelationId(context.correlationId);
+  }
+}
+
+function hasSameLifecycleAuthority(
+  submittedLease: ConnectorLease,
+  durableLease: ConnectorLease,
+): boolean {
+  return (
+    submittedLease.identity.tenantId === durableLease.identity.tenantId &&
+    submittedLease.identity.logicalAgentId === durableLease.identity.logicalAgentId &&
+    submittedLease.bindingId === durableLease.bindingId &&
+    submittedLease.leaseId === durableLease.leaseId &&
+    submittedLease.connectorId === durableLease.connectorId &&
+    submittedLease.leaseEpoch === durableLease.leaseEpoch &&
+    submittedLease.scopes.length === durableLease.scopes.length &&
+    submittedLease.scopes.every((scope: string, index: number): boolean => {
+      return scope === durableLease.scopes[index];
+    })
+  );
+}

apps/gateway/src/agent/durable-session.dto.ts

@@ -0,0 +1,10 @@
+import type { RuntimeProviderRequestContext } from './runtime-provider-registry.service.js';
+
+/** Server-side request for a replay-safe provider message. */
+export interface ProviderOutboxDto {
+  sessionId: string;
+  idempotencyKey: string;
+  correlationId: string;
+  content: string;
+  context: RuntimeProviderRequestContext;
+}

apps/gateway/src/agent/durable-session.repository.test.ts

@@ -0,0 +1,416 @@
+import { mkdtempSync, rmSync } from 'node:fs';
+import { tmpdir } from 'node:os';
+import { join } from 'node:path';
+import { createHash } from 'node:crypto';
+import { eq, sql, interactionCheckpoints, interactionInbox } from '@mosaicstack/db';
+import { DurableSessionCoordinator, type DurableSessionIdentity } from '@mosaicstack/agent';
+import { afterAll, beforeAll, beforeEach, describe, expect, it, vi } from 'vitest';
+import { createPgliteDb, runPgliteMigrations, type DbHandle } from '@mosaicstack/db';
+import { DurableSessionRepository } from './durable-session.repository.js';
+import { DurableSessionService } from './durable-session.service.js';
+
+const IDENTITY: DurableSessionIdentity = {
+  agentName: 'Nova',
+  sessionId: 'tess-pglite-session',
+  tenantId: 'tenant-pglite',
+  ownerId: 'tess-owner',
+  providerId: 'fleet',
+  runtimeSessionId: 'nova',
+};
+
+describe('DurableSessionRepository', () => {
+  let dataDir: string | undefined;
+  let handle: DbHandle;
+  let previousAuthSecret: string | undefined;
+
+  beforeAll(async (): Promise<void> => {
+    previousAuthSecret = process.env['BETTER_AUTH_SECRET'];
+    process.env['BETTER_AUTH_SECRET'] = 'tess-durable-state-test-sealing-key';
+    dataDir = mkdtempSync(join(tmpdir(), 'tess-durable-state-'));
+    handle = createPgliteDb(dataDir);
+    await runPgliteMigrations(handle);
+    await seedOwner(handle);
+  }, 30_000);
+
+  beforeEach(async (): Promise<void> => {
+    await handle.db.execute(sql`DELETE FROM interaction_handoffs`);
+    await handle.db.execute(sql`DELETE FROM interaction_checkpoints`);
+    await handle.db.execute(sql`DELETE FROM interaction_inbox`);
+    await handle.db.execute(sql`DELETE FROM interaction_outbox`);
+    await handle.db.execute(sql`DELETE FROM interaction_sessions`);
+  });
+
+  afterAll(async (): Promise<void> => {
+    await handle.close();
+    if (dataDir) rmSync(dataDir, { recursive: true, force: true });
+    if (previousAuthSecret === undefined) delete process.env['BETTER_AUTH_SECRET'];
+    else process.env['BETTER_AUTH_SECRET'] = previousAuthSecret;
+  });
+
+  it('survives a full PGlite close/reopen mid-session without duplicate inbox or outbox side effects', async () => {
+    const beforeRestart = new DurableSessionCoordinator(new DurableSessionRepository(handle.db));
+    await beforeRestart.create(IDENTITY);
+    await beforeRestart.receive({
+      sessionId: IDENTITY.sessionId,
+      idempotencyKey: 'inbox-before-kill',
+      correlationId: 'correlation-before-kill',
+      content: 'resume after a kill',
+    });
+    await beforeRestart.enqueueOutbox({
+      sessionId: IDENTITY.sessionId,
+      idempotencyKey: 'outbox-before-kill',
+      correlationId: 'correlation-before-kill',
+      channelId: 'cli',
+      kind: 'provider.send',
+      content: 'one response only',
+    });
+    await beforeRestart.checkpoint({
+      sessionId: IDENTITY.sessionId,
+      checkpointId: 'checkpoint-before-kill',
+      cursor: 'cursor-before-kill',
+      summary: 'restart-safe state',
+      compactionEpoch: 1,
+    });
+    await beforeRestart.handoff({
+      sessionId: IDENTITY.sessionId,
+      handoffId: 'handoff-before-kill',
+      destination: 'mos',
+      correlationId: 'correlation-before-kill',
+      checkpointId: 'checkpoint-before-kill',
+      status: 'pending',
+    });
+    await beforeRestart.checkpoint({
+      sessionId: IDENTITY.sessionId,
+      checkpointId: 'checkpoint-after-handoff',
+      cursor: 'cursor-after-handoff',
+      summary: 'newer state cannot strand the portable handoff',
+      compactionEpoch: 2,
+    });
+
+    await handle.close();
+    handle = createPgliteDb(dataDir!);
+
+    const afterRestart = new DurableSessionCoordinator(new DurableSessionRepository(handle.db));
+    const recovered = await afterRestart.recover(IDENTITY.sessionId);
+    const resumedHandoff = await afterRestart.resumeHandoff('handoff-before-kill');
+    const handled: string[] = [];
+    const effects: string[] = [];
+
+    await afterRestart.drainInbox(IDENTITY.sessionId, async (entry): Promise<void> => {
+      handled.push(entry.idempotencyKey);
+    });
+    await afterRestart.dispatchOutbox(IDENTITY.sessionId, async (entry): Promise<void> => {
+      effects.push(entry.idempotencyKey);
+    });
+    await afterRestart.drainInbox(IDENTITY.sessionId, async (entry): Promise<void> => {
+      handled.push(entry.idempotencyKey);
+    });
+    await afterRestart.dispatchOutbox(IDENTITY.sessionId, async (entry): Promise<void> => {
+      effects.push(entry.idempotencyKey);
+    });
+
+    expect(recovered.identity).toEqual(IDENTITY);
+    expect(recovered.checkpoint).toMatchObject({ checkpointId: 'checkpoint-after-handoff' });
+    expect(recovered.handoffs).toMatchObject([{ handoffId: 'handoff-before-kill' }]);
+    expect(resumedHandoff.checkpoint).toMatchObject({ checkpointId: 'checkpoint-before-kill' });
+    expect(handled).toEqual(['inbox-before-kill']);
+    expect(effects).toEqual(['outbox-before-kill']);
+  }, 30_000);
+
+  it('redacts sensitive durable payloads before persistence', async () => {
+    const coordinator = new DurableSessionCoordinator(new DurableSessionRepository(handle.db));
+    await coordinator.create(IDENTITY);
+    await coordinator.receive({
+      sessionId: IDENTITY.sessionId,
+      idempotencyKey: 'redacted-inbox',
+      correlationId: 'correlation-redaction',
+      content: 'api_key=super-secret-canary',
+    });
+    await coordinator.enqueueOutbox({
+      sessionId: IDENTITY.sessionId,
+      idempotencyKey: 'redacted-outbox',
+      correlationId: 'correlation-redaction',
+      channelId: 'cli',
+      kind: 'provider.send',
+      content: 'email [email protected] api_key=super-secret-canary',
+    });
+    await coordinator.checkpoint({
+      sessionId: IDENTITY.sessionId,
+      checkpointId: 'redacted-checkpoint',
+      cursor: 'bearer super-secret-canary',
+      summary: 'email [email protected]',
+      compactionEpoch: 0,
+    });
+
+    const snapshot = await coordinator.snapshot(IDENTITY.sessionId);
+    const [persisted] = await handle.db
+      .select({ content: interactionInbox.content })
+      .from(interactionInbox)
+      .where(eq(interactionInbox.idempotencyKey, 'redacted-inbox'));
+
+    expect(JSON.stringify(snapshot)).not.toContain('super-secret-canary');
+    expect(JSON.stringify(snapshot)).not.toContain('[email protected]');
+    expect(persisted?.content).not.toContain('super-secret-canary');
+    expect(persisted?.content).not.toContain('[REDACTED]');
+  }, 30_000);
+
+  it('fails closed when the configured idempotency secret is unavailable', async () => {
+    const coordinator = new DurableSessionCoordinator(new DurableSessionRepository(handle.db));
+    await coordinator.create(IDENTITY);
+    const secret = process.env['BETTER_AUTH_SECRET'];
+    delete process.env['BETTER_AUTH_SECRET'];
+    try {
+      await expect(
+        coordinator.receive({
+          sessionId: IDENTITY.sessionId,
+          idempotencyKey: 'requires-idempotency-secret',
+          correlationId: 'correlation-secret',
+          content: 'sensitive payload',
+        }),
+      ).rejects.toThrow(/required for durable idempotency digests/);
+    } finally {
+      if (secret === undefined) delete process.env['BETTER_AUTH_SECRET'];
+      else process.env['BETTER_AUTH_SECRET'] = secret;
+    }
+  }, 30_000);
+
+  it('uses keyed pre-redaction digests to reject distinct sensitive checkpoint payloads', async () => {
+    const coordinator = new DurableSessionCoordinator(new DurableSessionRepository(handle.db));
+    await coordinator.create(IDENTITY);
+    const input = {
+      sessionId: IDENTITY.sessionId,
+      checkpointId: 'checkpoint-secret-conflict',
+      cursor: 'api_key=secret-one',
+      summary: 'bearer secret-one',
+      compactionEpoch: 1,
+    };
+    await coordinator.checkpoint(input);
+
+    await expect(
+      coordinator.checkpoint({
+        ...input,
+        cursor: 'api_key=secret-two',
+        summary: 'bearer secret-two',
+      }),
+    ).rejects.toThrow(/checkpoint identity conflict/);
+
+    const [persisted] = await handle.db
+      .select({
+        digest: interactionCheckpoints.contentDigest,
+        cursor: interactionCheckpoints.cursor,
+      })
+      .from(interactionCheckpoints)
+      .where(eq(interactionCheckpoints.checkpointId, input.checkpointId));
+    expect(persisted?.cursor).not.toContain('secret-one');
+    expect(persisted?.digest).not.toBe(
+      createHash('sha256')
+        .update(JSON.stringify([input.cursor, input.summary]))
+        .digest('hex'),
+    );
+
+    await coordinator.checkpoint({
+      ...input,
+      checkpointId: 'checkpoint-delimiter-conflict',
+      cursor: 'a\u0000b',
+      summary: 'c',
+    });
+    await expect(
+      coordinator.checkpoint({
+        ...input,
+        checkpointId: 'checkpoint-delimiter-conflict',
+        cursor: 'a',
+        summary: 'b\u0000c',
+      }),
+    ).rejects.toThrow(/checkpoint identity conflict/);
+  }, 30_000);
+
+  it('rejects distinct sensitive inbox and outbox payloads under reused idempotency keys', async () => {
+    const coordinator = new DurableSessionCoordinator(new DurableSessionRepository(handle.db));
+    await coordinator.create(IDENTITY);
+    const inbox = {
+      sessionId: IDENTITY.sessionId,
+      idempotencyKey: 'inbox-secret-conflict',
+      correlationId: 'correlation-inbox-secret',
+      content: 'api_key=secret-one',
+    };
+    const outbox = {
+      sessionId: IDENTITY.sessionId,
+      idempotencyKey: 'outbox-secret-conflict',
+      correlationId: 'correlation-outbox-secret',
+      channelId: 'cli',
+      kind: 'provider.send',
+      content: 'api_key=secret-one',
+    };
+    await coordinator.receive(inbox);
+    await coordinator.enqueueOutbox(outbox);
+
+    await expect(coordinator.receive({ ...inbox, content: 'api_key=secret-two' })).rejects.toThrow(
+      /idempotency conflict/,
+    );
+    await expect(
+      coordinator.enqueueOutbox({ ...outbox, content: 'api_key=secret-two' }),
+    ).rejects.toThrow(/idempotency conflict/);
+  }, 30_000);
+
+  it('rejects database inbox and outbox idempotency-key conflicts', async () => {
+    const coordinator = new DurableSessionCoordinator(new DurableSessionRepository(handle.db));
+    await coordinator.create(IDENTITY);
+    await coordinator.receive({
+      sessionId: IDENTITY.sessionId,
+      idempotencyKey: 'inbox-conflict',
+      correlationId: 'correlation-inbox',
+      content: 'original inbox',
+    });
+    await coordinator.enqueueOutbox({
+      sessionId: IDENTITY.sessionId,
+      idempotencyKey: 'outbox-conflict',
+      correlationId: 'correlation-outbox',
+      channelId: 'cli',
+      kind: 'provider.send',
+      content: 'original outbox',
+    });
+
+    await expect(
+      coordinator.receive({
+        sessionId: IDENTITY.sessionId,
+        idempotencyKey: 'inbox-conflict',
+        correlationId: 'forged-correlation',
+        content: 'original inbox',
+      }),
+    ).rejects.toThrow(/idempotency conflict/);
+    await expect(
+      coordinator.enqueueOutbox({
+        sessionId: IDENTITY.sessionId,
+        idempotencyKey: 'outbox-conflict',
+        correlationId: 'correlation-outbox',
+        channelId: 'forged-channel',
+        kind: 'provider.send',
+        content: 'original outbox',
+      }),
+    ).rejects.toThrow(/idempotency conflict/);
+  }, 30_000);
+
+  it('does not requeue a live outbox claim during a normal scoped dispatch', async () => {
+    const repository = new DurableSessionRepository(handle.db);
+    const coordinator = new DurableSessionCoordinator(repository);
+    const runtimeProviders = { sendMessage: vi.fn().mockResolvedValue(undefined) };
+    const service = new DurableSessionService(repository, runtimeProviders as never);
+    const input = {
+      sessionId: IDENTITY.sessionId,
+      idempotencyKey: 'live-effect',
+      correlationId: 'correlation-live',
+      content: 'must not duplicate',
+      context: {
+        actorScope: { userId: IDENTITY.ownerId, tenantId: IDENTITY.tenantId },
+        channelId: 'cli',
+        correlationId: 'correlation-live',
+      },
+    };
+
+    await coordinator.create(IDENTITY);
+    await service.queueProviderSend(input);
+    expect(await repository.claimOutbox(IDENTITY.sessionId)).toMatchObject({
+      status: 'processing',
+    });
+
+    await service.dispatchProviderOutbox(IDENTITY.sessionId, input);
+    await expect(
+      service.recoverProviderSession(IDENTITY.sessionId, {
+        ...input,
+        context: {
+          ...input.context,
+          actorScope: { userId: 'intruder', tenantId: 'tenant-pglite' },
+        },
+      }),
+    ).rejects.toThrow(/scope or correlation mismatch/);
+
+    expect(runtimeProviders.sendMessage).not.toHaveBeenCalled();
+    expect(await coordinator.snapshot(IDENTITY.sessionId)).toMatchObject({
+      outbox: [{ idempotencyKey: 'live-effect', status: 'processing' }],
+    });
+  }, 30_000);
+
+  it('rejects an outbox correlation mismatch before claiming the pending effect', async () => {
+    const repository = new DurableSessionRepository(handle.db);
+    const coordinator = new DurableSessionCoordinator(repository);
+    const runtimeProviders = { sendMessage: vi.fn().mockResolvedValue(undefined) };
+    const service = new DurableSessionService(repository, runtimeProviders as never);
+    const input = {
+      sessionId: IDENTITY.sessionId,
+      idempotencyKey: 'mismatch-effect',
+      correlationId: 'correlation-expected',
+      content: 'must remain pending',
+      context: {
+        actorScope: { userId: IDENTITY.ownerId, tenantId: IDENTITY.tenantId },
+        channelId: 'cli',
+        correlationId: 'correlation-expected',
+      },
+    };
+
+    await coordinator.create(IDENTITY);
+    await service.queueProviderSend(input);
+    await expect(
+      service.dispatchProviderOutbox(IDENTITY.sessionId, {
+        ...input,
+        correlationId: 'correlation-forged',
+        context: { ...input.context, correlationId: 'correlation-forged' },
+      }),
+    ).rejects.toThrow(/scope or correlation mismatch/);
+
+    expect(runtimeProviders.sendMessage).not.toHaveBeenCalled();
+    expect(await coordinator.snapshot(IDENTITY.sessionId)).toMatchObject({
+      outbox: [{ idempotencyKey: 'mismatch-effect', status: 'pending' }],
+    });
+  }, 30_000);
+
+  it('dispatches only the outbox record bound to the supplied correlation and channel', async () => {
+    const repository = new DurableSessionRepository(handle.db);
+    const coordinator = new DurableSessionCoordinator(repository);
+    const runtimeProviders = { sendMessage: vi.fn().mockResolvedValue(undefined) };
+    const service = new DurableSessionService(repository, runtimeProviders as never);
+    const first = {
+      sessionId: IDENTITY.sessionId,
+      idempotencyKey: 'scoped-effect-one',
+      correlationId: 'correlation-one',
+      content: 'first result',
+      context: {
+        actorScope: { userId: IDENTITY.ownerId, tenantId: IDENTITY.tenantId },
+        channelId: 'cli',
+        correlationId: 'correlation-one',
+      },
+    };
+    const second = {
+      ...first,
+      idempotencyKey: 'scoped-effect-two',
+      correlationId: 'correlation-two',
+      content: 'second result',
+      context: { ...first.context, correlationId: 'correlation-two' },
+    };
+
+    await coordinator.create(IDENTITY);
+    await service.queueProviderSend(first);
+    await service.queueProviderSend(second);
+    await service.dispatchProviderOutbox(IDENTITY.sessionId, first);
+
+    expect(runtimeProviders.sendMessage).toHaveBeenCalledTimes(1);
+    expect(runtimeProviders.sendMessage).toHaveBeenCalledWith(
+      IDENTITY.providerId,
+      IDENTITY.runtimeSessionId,
+      { content: 'first result', idempotencyKey: 'scoped-effect-one' },
+      first.context,
+    );
+    expect(await coordinator.snapshot(IDENTITY.sessionId)).toMatchObject({
+      outbox: [
+        { idempotencyKey: 'scoped-effect-one', status: 'delivered' },
+        { idempotencyKey: 'scoped-effect-two', status: 'pending' },
+      ],
+    });
+  }, 30_000);
+});
+
+async function seedOwner(handle: DbHandle): Promise<void> {
+  await handle.db.execute(sql`
+    INSERT INTO users (id, name, email, email_verified, created_at, updated_at)
+    VALUES ('tess-owner', 'Tess Owner', '[email protected]', false, now(), now())
+  `);
+}

apps/gateway/src/agent/durable-session.repository.ts

@@ -0,0 +1,529 @@
+import { createHash, createHmac } from 'node:crypto';
+import { Inject, Injectable } from '@nestjs/common';
+import {
+  and,
+  asc,
+  desc,
+  eq,
+  interactionCheckpoints,
+  interactionHandoffs,
+  interactionInbox,
+  interactionOutbox,
+  interactionSessions,
+  type Db,
+} from '@mosaicstack/db';
+import { seal, unseal } from '@mosaicstack/auth';
+import { redactSensitiveContent } from '@mosaicstack/log';
+import type {
+  DurableCheckpoint,
+  DurableCheckpointInput,
+  DurableEnqueueResult,
+  DurableHandoff,
+  DurableHandoffInput,
+  DurableInboxEntry,
+  DurableInboxInput,
+  DurableInboxStatus,
+  DurableOutboxEntry,
+  DurableOutboxInput,
+  DurableOutboxStatus,
+  DurableSessionIdentity,
+  DurableSessionSnapshot,
+  DurableSessionStore,
+} from '@mosaicstack/agent';
+import { DB } from '../database/database.module.js';
+
+@Injectable()
+export class DurableSessionRepository implements DurableSessionStore {
+  constructor(@Inject(DB) private readonly db: Db) {}
+
+  async create(identity: DurableSessionIdentity): Promise<void> {
+    await this.db
+      .insert(interactionSessions)
+      .values({
+        id: identity.sessionId,
+        agentName: identity.agentName,
+        tenantId: identity.tenantId,
+        ownerId: identity.ownerId,
+        providerId: identity.providerId,
+        runtimeSessionId: identity.runtimeSessionId,
+      })
+      .onConflictDoNothing();
+
+    const existing = await this.session(identity.sessionId);
+    if (!existing || !sameEnrollmentScope(existing, identity)) {
+      throw new Error(`Durable session identity conflict: ${identity.sessionId}`);
+    }
+    // A recovered/re-enrolled runtime can receive a new provider session ID;
+    // the conversation handle and owner scope remain immutable.
+    if (
+      existing.providerId !== identity.providerId ||
+      existing.runtimeSessionId !== identity.runtimeSessionId
+    ) {
+      await this.db
+        .update(interactionSessions)
+        .set({ providerId: identity.providerId, runtimeSessionId: identity.runtimeSessionId })
+        .where(eq(interactionSessions.id, identity.sessionId));
+    }
+  }
+
+  async snapshot(sessionId: string): Promise<DurableSessionSnapshot | null> {
+    const identity = await this.session(sessionId);
+    if (!identity) return null;
+
+    const [inbox, outbox, checkpoints, handoffs] = await Promise.all([
+      this.db
+        .select()
+        .from(interactionInbox)
+        .where(eq(interactionInbox.sessionId, sessionId))
+        .orderBy(asc(interactionInbox.createdAt)),
+      this.db
+        .select()
+        .from(interactionOutbox)
+        .where(eq(interactionOutbox.sessionId, sessionId))
+        .orderBy(asc(interactionOutbox.createdAt)),
+      this.db
+        .select()
+        .from(interactionCheckpoints)
+        .where(eq(interactionCheckpoints.sessionId, sessionId))
+        .orderBy(
+          desc(interactionCheckpoints.compactionEpoch),
+          desc(interactionCheckpoints.createdAt),
+        )
+        .limit(1),
+      this.db
+        .select()
+        .from(interactionHandoffs)
+        .where(eq(interactionHandoffs.sessionId, sessionId))
+        .orderBy(asc(interactionHandoffs.createdAt)),
+    ]);
+
+    const checkpoint = checkpoints[0];
+    return {
+      identity,
+      inbox: inbox.map(toInbox),
+      outbox: outbox.map(toOutbox),
+      ...(checkpoint ? { checkpoint: toCheckpoint(checkpoint) } : {}),
+      handoffs: handoffs.map(toHandoff),
+    };
+  }
+
+  async enqueueInbox(input: DurableInboxInput): Promise<DurableEnqueueResult<DurableInboxStatus>> {
+    const digest = contentDigest(input.content);
+    const record: DurableInboxInput = {
+      ...input,
+      content: redactSensitiveContent(input.content).content,
+    };
+    const inserted = await this.db
+      .insert(interactionInbox)
+      .values({
+        ...record,
+        content: seal(record.content),
+        contentDigest: digest,
+        status: 'pending',
+      })
+      .onConflictDoNothing()
+      .returning({ status: interactionInbox.status });
+    if (inserted[0]) return { accepted: true, status: inserted[0].status };
+
+    const existing = await this.db
+      .select()
+      .from(interactionInbox)
+      .where(
+        and(
+          eq(interactionInbox.sessionId, input.sessionId),
+          eq(interactionInbox.idempotencyKey, input.idempotencyKey),
+        ),
+      )
+      .limit(1);
+    if (!existing[0]) throw new Error(`Durable inbox enqueue failed: ${input.idempotencyKey}`);
+    const entry = toInbox(existing[0]);
+    if (
+      !sameInbox(entry, record) ||
+      !matchesContentDigest(existing[0].contentDigest, input.content)
+    ) {
+      throw new Error(`Durable inbox idempotency conflict: ${input.idempotencyKey}`);
+    }
+    return { accepted: false, status: entry.status };
+  }
+
+  async claimInbox(sessionId: string): Promise<DurableInboxEntry | null> {
+    for (let attempt = 0; attempt < 3; attempt += 1) {
+      const candidate = await this.db
+        .select()
+        .from(interactionInbox)
+        .where(
+          and(eq(interactionInbox.sessionId, sessionId), eq(interactionInbox.status, 'pending')),
+        )
+        .orderBy(asc(interactionInbox.createdAt))
+        .limit(1);
+      const entry = candidate[0];
+      if (!entry) return null;
+      const claimed = await this.db
+        .update(interactionInbox)
+        .set({ status: 'processing', updatedAt: new Date() })
+        .where(and(eq(interactionInbox.id, entry.id), eq(interactionInbox.status, 'pending')))
+        .returning();
+      if (claimed[0]) return toInbox(claimed[0]);
+    }
+    return null;
+  }
+
+  async completeInbox(sessionId: string, idempotencyKey: string): Promise<void> {
+    await this.db
+      .update(interactionInbox)
+      .set({ status: 'processed', updatedAt: new Date() })
+      .where(
+        and(
+          eq(interactionInbox.sessionId, sessionId),
+          eq(interactionInbox.idempotencyKey, idempotencyKey),
+          eq(interactionInbox.status, 'processing'),
+        ),
+      );
+  }
+
+  async releaseInbox(sessionId: string, idempotencyKey: string): Promise<void> {
+    await this.db
+      .update(interactionInbox)
+      .set({ status: 'pending', updatedAt: new Date() })
+      .where(
+        and(
+          eq(interactionInbox.sessionId, sessionId),
+          eq(interactionInbox.idempotencyKey, idempotencyKey),
+          eq(interactionInbox.status, 'processing'),
+        ),
+      );
+  }
+
+  async enqueueOutbox(
+    input: DurableOutboxInput,
+  ): Promise<DurableEnqueueResult<DurableOutboxStatus>> {
+    const digest = contentDigest(input.content);
+    const record: DurableOutboxInput = {
+      ...input,
+      content: redactSensitiveContent(input.content).content,
+    };
+    const inserted = await this.db
+      .insert(interactionOutbox)
+      .values({
+        ...record,
+        content: seal(record.content),
+        contentDigest: digest,
+        status: 'pending',
+      })
+      .onConflictDoNothing()
+      .returning({ status: interactionOutbox.status });
+    if (inserted[0]) return { accepted: true, status: inserted[0].status };
+
+    const existing = await this.db
+      .select()
+      .from(interactionOutbox)
+      .where(
+        and(
+          eq(interactionOutbox.sessionId, input.sessionId),
+          eq(interactionOutbox.idempotencyKey, input.idempotencyKey),
+        ),
+      )
+      .limit(1);
+    if (!existing[0]) throw new Error(`Durable outbox enqueue failed: ${input.idempotencyKey}`);
+    const entry = toOutbox(existing[0]);
+    if (
+      !sameOutbox(entry, record) ||
+      !matchesContentDigest(existing[0].contentDigest, input.content)
+    ) {
+      throw new Error(`Durable outbox idempotency conflict: ${input.idempotencyKey}`);
+    }
+    return { accepted: false, status: entry.status };
+  }
+
+  async claimOutbox(sessionId: string): Promise<DurableOutboxEntry | null> {
+    for (let attempt = 0; attempt < 3; attempt += 1) {
+      const candidate = await this.db
+        .select()
+        .from(interactionOutbox)
+        .where(
+          and(eq(interactionOutbox.sessionId, sessionId), eq(interactionOutbox.status, 'pending')),
+        )
+        .orderBy(asc(interactionOutbox.createdAt))
+        .limit(1);
+      const entry = candidate[0];
+      if (!entry) return null;
+      const claimed = await this.db
+        .update(interactionOutbox)
+        .set({ status: 'processing', updatedAt: new Date() })
+        .where(and(eq(interactionOutbox.id, entry.id), eq(interactionOutbox.status, 'pending')))
+        .returning();
+      if (claimed[0]) return toOutbox(claimed[0]);
+    }
+    return null;
+  }
+
+  async claimOutboxByKey(
+    sessionId: string,
+    idempotencyKey: string,
+  ): Promise<DurableOutboxEntry | null> {
+    const claimed = await this.db
+      .update(interactionOutbox)
+      .set({ status: 'processing', updatedAt: new Date() })
+      .where(
+        and(
+          eq(interactionOutbox.sessionId, sessionId),
+          eq(interactionOutbox.idempotencyKey, idempotencyKey),
+          eq(interactionOutbox.status, 'pending'),
+        ),
+      )
+      .returning();
+    return claimed[0] ? toOutbox(claimed[0]) : null;
+  }
+
+  async completeOutbox(sessionId: string, idempotencyKey: string): Promise<void> {
+    await this.db
+      .update(interactionOutbox)
+      .set({ status: 'delivered', updatedAt: new Date() })
+      .where(
+        and(
+          eq(interactionOutbox.sessionId, sessionId),
+          eq(interactionOutbox.idempotencyKey, idempotencyKey),
+          eq(interactionOutbox.status, 'processing'),
+        ),
+      );
+  }
+
+  async releaseOutbox(sessionId: string, idempotencyKey: string): Promise<void> {
+    await this.db
+      .update(interactionOutbox)
+      .set({ status: 'pending', updatedAt: new Date() })
+      .where(
+        and(
+          eq(interactionOutbox.sessionId, sessionId),
+          eq(interactionOutbox.idempotencyKey, idempotencyKey),
+          eq(interactionOutbox.status, 'processing'),
+        ),
+      );
+  }
+
+  async checkpoint(input: DurableCheckpointInput): Promise<void> {
+    // Compute identity before redaction.  The persisted digest is keyed so a database
+    // reader cannot use it as an offline oracle for sensitive cursor/summary values.
+    const digest = contentDigest(JSON.stringify([input.cursor, input.summary]));
+    const checkpoint: DurableCheckpointInput = {
+      ...input,
+      cursor: redactSensitiveContent(input.cursor).content,
+      summary: redactSensitiveContent(input.summary).content,
+    };
+    const inserted = await this.db
+      .insert(interactionCheckpoints)
+      .values({
+        ...checkpoint,
+        contentDigest: digest,
+        cursor: seal(checkpoint.cursor),
+        summary: seal(checkpoint.summary),
+      })
+      .onConflictDoNothing()
+      .returning({ checkpointId: interactionCheckpoints.checkpointId });
+    if (inserted[0]) return;
+
+    const existing = await this.db
+      .select()
+      .from(interactionCheckpoints)
+      .where(
+        and(
+          eq(interactionCheckpoints.sessionId, input.sessionId),
+          eq(interactionCheckpoints.checkpointId, input.checkpointId),
+        ),
+      )
+      .limit(1);
+    if (
+      !existing[0] ||
+      !sameCheckpoint(toCheckpoint(existing[0]), checkpoint) ||
+      !matchesCheckpointDigest(existing[0].contentDigest, digest)
+    ) {
+      throw new Error(`Durable checkpoint identity conflict: ${input.checkpointId}`);
+    }
+  }
+
+  async findCheckpoint(sessionId: string, checkpointId: string): Promise<DurableCheckpoint | null> {
+    const checkpoints = await this.db
+      .select()
+      .from(interactionCheckpoints)
+      .where(
+        and(
+          eq(interactionCheckpoints.sessionId, sessionId),
+          eq(interactionCheckpoints.checkpointId, checkpointId),
+        ),
+      )
+      .limit(1);
+    const checkpoint = checkpoints[0];
+    return checkpoint ? toCheckpoint(checkpoint) : null;
+  }
+
+  async handoff(input: DurableHandoffInput): Promise<void> {
+    const checkpoint = await this.findCheckpoint(input.sessionId, input.checkpointId);
+    if (!checkpoint) {
+      throw new Error(`Durable handoff checkpoint is unavailable: ${input.checkpointId}`);
+    }
+    const inserted = await this.db
+      .insert(interactionHandoffs)
+      .values({ ...input })
+      .onConflictDoNothing()
+      .returning({ handoffId: interactionHandoffs.handoffId });
+    if (inserted[0]) return;
+
+    const existing = await this.findHandoff(input.handoffId);
+    if (!existing || !sameHandoff(existing, input)) {
+      throw new Error(`Durable handoff identity conflict: ${input.handoffId}`);
+    }
+  }
+
+  async findHandoff(handoffId: string): Promise<DurableHandoff | null> {
+    const handoffs = await this.db
+      .select()
+      .from(interactionHandoffs)
+      .where(eq(interactionHandoffs.handoffId, handoffId))
+      .limit(1);
+    const handoff = handoffs[0];
+    return handoff ? toHandoff(handoff) : null;
+  }
+
+  async requeueInFlight(sessionId: string): Promise<void> {
+    // Inbox handlers are process-local work. A provider outbox claim may have
+    // reached an external target before a crash, so it is deliberately not
+    // replayed by generic recovery.
+    await this.db
+      .update(interactionInbox)
+      .set({ status: 'pending', updatedAt: new Date() })
+      .where(
+        and(eq(interactionInbox.sessionId, sessionId), eq(interactionInbox.status, 'processing')),
+      );
+  }
+
+  private async session(sessionId: string): Promise<DurableSessionIdentity | null> {
+    const sessions = await this.db
+      .select()
+      .from(interactionSessions)
+      .where(eq(interactionSessions.id, sessionId))
+      .limit(1);
+    const session = sessions[0];
+    return session
+      ? {
+          agentName: session.agentName,
+          sessionId: session.id,
+          tenantId: session.tenantId,
+          ownerId: session.ownerId,
+          providerId: session.providerId,
+          runtimeSessionId: session.runtimeSessionId,
+        }
+      : null;
+  }
+}
+
+function contentDigest(content: string): string {
+  const secret = process.env['BETTER_AUTH_SECRET'];
+  if (!secret) {
+    throw new Error('BETTER_AUTH_SECRET is required for durable idempotency digests');
+  }
+  return `hmac:v1:${createHmac('sha256', secret).update(content).digest('hex')}`;
+}
+
+function matchesContentDigest(stored: string, content: string): boolean {
+  return (
+    stored === contentDigest(content) ||
+    stored === createHash('sha256').update(content).digest('hex')
+  );
+}
+
+function matchesCheckpointDigest(stored: string, digest: string): boolean {
+  // Legacy rows predate any pre-redaction identity and cannot safely prove equality.
+  // Reject rather than let redaction collapse distinct sensitive checkpoint payloads.
+  return stored === digest;
+}
+
+function sameEnrollmentScope(left: DurableSessionIdentity, right: DurableSessionIdentity): boolean {
+  return (
+    left.agentName === right.agentName &&
+    left.sessionId === right.sessionId &&
+    left.tenantId === right.tenantId &&
+    left.ownerId === right.ownerId
+  );
+}
+
+function sameInbox(left: DurableInboxEntry, right: DurableInboxInput): boolean {
+  return (
+    left.sessionId === right.sessionId &&
+    left.idempotencyKey === right.idempotencyKey &&
+    left.correlationId === right.correlationId &&
+    left.content === right.content
+  );
+}
+
+function sameOutbox(left: DurableOutboxEntry, right: DurableOutboxInput): boolean {
+  return (
+    left.sessionId === right.sessionId &&
+    left.idempotencyKey === right.idempotencyKey &&
+    left.correlationId === right.correlationId &&
+    left.channelId === right.channelId &&
+    left.kind === right.kind &&
+    left.content === right.content
+  );
+}
+
+function sameCheckpoint(left: DurableCheckpoint, right: DurableCheckpointInput): boolean {
+  return (
+    left.sessionId === right.sessionId &&
+    left.checkpointId === right.checkpointId &&
+    left.compactionEpoch === right.compactionEpoch
+  );
+}
+
+function sameHandoff(left: DurableHandoff, right: DurableHandoffInput): boolean {
+  return (
+    left.sessionId === right.sessionId &&
+    left.handoffId === right.handoffId &&
+    left.destination === right.destination &&
+    left.correlationId === right.correlationId &&
+    left.checkpointId === right.checkpointId &&
+    left.status === right.status
+  );
+}
+
+function toInbox(row: typeof interactionInbox.$inferSelect): DurableInboxEntry {
+  return {
+    sessionId: row.sessionId,
+    idempotencyKey: row.idempotencyKey,
+    correlationId: row.correlationId,
+    content: unseal(row.content),
+    status: row.status,
+  };
+}
+
+function toOutbox(row: typeof interactionOutbox.$inferSelect): DurableOutboxEntry {
+  return {
+    sessionId: row.sessionId,
+    idempotencyKey: row.idempotencyKey,
+    correlationId: row.correlationId,
+    channelId: row.channelId,
+    kind: row.kind,
+    content: unseal(row.content),
+    status: row.status,
+  };
+}
+
+function toCheckpoint(row: typeof interactionCheckpoints.$inferSelect): DurableCheckpoint {
+  return {
+    sessionId: row.sessionId,
+    checkpointId: row.checkpointId,
+    cursor: unseal(row.cursor),
+    summary: unseal(row.summary),
+    compactionEpoch: row.compactionEpoch,
+  };
+}
+
+function toHandoff(row: typeof interactionHandoffs.$inferSelect): DurableHandoff {
+  return {
+    sessionId: row.sessionId,
+    handoffId: row.handoffId,
+    destination: row.destination,
+    correlationId: row.correlationId,
+    checkpointId: row.checkpointId,
+    status: row.status,
+  };
+}

apps/gateway/src/agent/durable-session.service.ts

@@ -0,0 +1,123 @@
+import { ForbiddenException, Inject, Injectable } from '@nestjs/common';
+import { DurableSessionCoordinator, type DurableSessionIdentity } from '@mosaicstack/agent';
+import type { ProviderOutboxDto } from './durable-session.dto.js';
+import { DurableSessionRepository } from './durable-session.repository.js';
+import {
+  RuntimeProviderService,
+  type RuntimeProviderRequestContext,
+} from './runtime-provider-registry.service.js';
+
+/**
+ * Scoped gateway boundary for the canonical durable session state machine. It deliberately
+ * uses composition: raw state methods cannot be injected into channel, CLI, or
+ * MCP adapters without a server-derived actor/tenant/correlation context.
+ */
+@Injectable()
+export class DurableSessionService {
+  private readonly coordinator: DurableSessionCoordinator;
+
+  constructor(
+    @Inject(DurableSessionRepository) repository: DurableSessionRepository,
+    @Inject(RuntimeProviderService) private readonly runtimeProviders: RuntimeProviderService,
+  ) {
+    this.coordinator = new DurableSessionCoordinator(repository);
+  }
+
+  /** Enroll a verified runtime session under the stable cross-surface conversation handle. */
+  async enroll(
+    identity: DurableSessionIdentity,
+    context: RuntimeProviderRequestContext,
+  ): Promise<void> {
+    if (
+      identity.ownerId !== context.actorScope.userId ||
+      identity.tenantId !== context.actorScope.tenantId
+    ) {
+      throw new ForbiddenException('Durable session enrollment scope mismatch');
+    }
+    await this.coordinator.create(identity);
+  }
+
+  async queueProviderSend(input: ProviderOutboxDto): Promise<void> {
+    const snapshot = await this.coordinator.snapshot(input.sessionId);
+    this.assertScope(snapshot.identity.ownerId, snapshot.identity.tenantId, input);
+    await this.coordinator.enqueueOutbox({
+      sessionId: input.sessionId,
+      idempotencyKey: input.idempotencyKey,
+      correlationId: input.correlationId,
+      channelId: input.context.channelId,
+      kind: 'provider.send',
+      content: input.content,
+    });
+  }
+
+  async dispatchProviderOutbox(sessionId: string, input: ProviderOutboxDto): Promise<void> {
+    if (sessionId !== input.sessionId) {
+      throw new ForbiddenException('Durable outbox session mismatch');
+    }
+    const snapshot = await this.coordinator.snapshot(sessionId);
+    this.assertScope(snapshot.identity.ownerId, snapshot.identity.tenantId, input);
+    const pendingEntry = snapshot.outbox.find(
+      (entry): boolean => entry.idempotencyKey === input.idempotencyKey,
+    );
+    if (!pendingEntry) return;
+    // Validate immutable routing before claiming. A caller with a mismatched
+    // correlation/channel must not strand a pending external side effect.
+    this.assertOutboxScope(pendingEntry, input);
+    await this.coordinator.dispatchOutboxEntry(
+      sessionId,
+      input.idempotencyKey,
+      async (entry): Promise<void> => {
+        this.assertOutboxScope(entry, input);
+        await this.runtimeProviders.sendMessage(
+          snapshot.identity.providerId,
+          snapshot.identity.runtimeSessionId,
+          { content: entry.content, idempotencyKey: entry.idempotencyKey },
+          input.context,
+        );
+      },
+    );
+  }
+
+  /** Read durable identity/state only after deriving and checking the server-side actor scope. */
+  async getSnapshot(sessionId: string, context: RuntimeProviderRequestContext) {
+    const snapshot = await this.coordinator.snapshot(sessionId);
+    this.assertScope(snapshot.identity.ownerId, snapshot.identity.tenantId, {
+      sessionId,
+      content: '',
+      idempotencyKey: 'read-only',
+      correlationId: context.correlationId,
+      context,
+    });
+    return snapshot;
+  }
+
+  /** Startup/recovery-only path; normal queue/dispatch methods never requeue live work. */
+  async recoverProviderSession(sessionId: string, input: ProviderOutboxDto): Promise<void> {
+    const snapshot = await this.coordinator.snapshot(sessionId);
+    this.assertScope(snapshot.identity.ownerId, snapshot.identity.tenantId, input);
+    await this.coordinator.recover(sessionId);
+  }
+
+  private assertOutboxScope(
+    entry: { kind: string; correlationId: string; channelId: string },
+    input: ProviderOutboxDto,
+  ): void {
+    if (
+      entry.kind !== 'provider.send' ||
+      entry.correlationId !== input.correlationId ||
+      entry.channelId !== input.context.channelId
+    ) {
+      throw new ForbiddenException('Durable outbox scope or correlation mismatch');
+    }
+  }
+
+  private assertScope(ownerId: string, tenantId: string, input: ProviderOutboxDto): void {
+    if (
+      input.context.actorScope.userId !== ownerId ||
+      input.context.actorScope.tenantId !== tenantId ||
+      input.context.correlationId !== input.correlationId
+    ) {
+      throw new ForbiddenException('Durable session scope or correlation mismatch');
+    }
+  }
+}

apps/gateway/src/agent/hermes-runtime-reachability.e2e.test.ts

@@ -0,0 +1,176 @@
+import 'reflect-metadata';
+import { afterAll, beforeAll, describe, expect, it, vi } from 'vitest';
+import { Global, Module } from '@nestjs/common';
+import { Test } from '@nestjs/testing';
+import { FastifyAdapter, type NestFastifyApplication } from '@nestjs/platform-fastify';
+import { HermesRuntimeProvider } from '@mosaicstack/agent';
+import { AgentModule } from './agent.module.js';
+import { AUTH } from '../auth/auth.tokens.js';
+import { AuthGuard } from '../auth/auth.guard.js';
+import { BRAIN } from '../brain/brain.tokens.js';
+import { DB } from '../database/database.module.js';
+import { CoordModule } from '../coord/coord.module.js';
+import { McpClientModule } from '../mcp-client/mcp-client.module.js';
+import { SkillsModule } from '../skills/skills.module.js';
+import { GCModule } from '../gc/gc.module.js';
+import { LogModule } from '../log/log.module.js';
+import { CommandsModule } from '../commands/commands.module.js';
+import {
+  AGENT_RUNTIME_PROVIDER_REGISTRY,
+  RUNTIME_APPROVAL_VERIFIER,
+  RUNTIME_PROVIDER_AUDIT_SINK,
+  RuntimeProviderAuditService,
+} from './runtime-provider-registry.service.js';
+import { DurableSessionService } from './durable-session.service.js';
+import { DurableSessionRepository } from './durable-session.repository.js';
+import { AgentService } from './agent.service.js';
+import { ProviderService } from './provider.service.js';
+import { ProviderCredentialsService } from './provider-credentials.service.js';
+import { RoutingService } from './routing.service.js';
+import { RoutingEngineService } from './routing/routing-engine.service.js';
+import { SkillLoaderService } from './skill-loader.service.js';
+
+const authenticatedUser = { id: 'operator-1', tenantId: 'tenant-1' };
+
+@Module({})
+class EmptyAgentDependencyModule {}
+
+@Global()
+@Module({
+  providers: [
+    {
+      provide: AUTH,
+      useValue: {
+        api: {
+          getSession: vi.fn(async ({ headers }: { headers: Headers }) =>
+            headers.get('cookie') === 'session=trusted'
+              ? { user: authenticatedUser, session: { id: 'session-1' } }
+              : null,
+          ),
+        },
+      },
+    },
+    AuthGuard,
+    { provide: BRAIN, useValue: {} },
+    { provide: DB, useValue: {} },
+  ],
+  exports: [AUTH, AuthGuard, BRAIN, DB],
+})
+class AuthenticatedRequestModule {}
+
+/**
+ * This is deliberately an HTTP test rather than a controller unit test: it
+ * exercises AgentModule's actual provider factory, Nest DI, and AuthGuard.
+ */
+describe('Hermes runtime provider reachability', (): void => {
+  let app: NestFastifyApplication | undefined;
+
+  beforeAll(async (): Promise<void> => {
+    process.env['MOSAIC_AGENT_NAME'] = 'Nova';
+    const moduleRef = await Test.createTestingModule({
+      imports: [AuthenticatedRequestModule, AgentModule],
+    })
+      .overrideModule(CoordModule)
+      .useModule(EmptyAgentDependencyModule)
+      .overrideModule(McpClientModule)
+      .useModule(EmptyAgentDependencyModule)
+      .overrideModule(SkillsModule)
+      .useModule(EmptyAgentDependencyModule)
+      .overrideModule(GCModule)
+      .useModule(EmptyAgentDependencyModule)
+      .overrideModule(LogModule)
+      .useModule(EmptyAgentDependencyModule)
+      .overrideModule(CommandsModule)
+      .useModule(EmptyAgentDependencyModule)
+      .overrideProvider(RuntimeProviderAuditService)
+      .useValue({ record: vi.fn().mockResolvedValue(undefined) })
+      .overrideProvider(RUNTIME_PROVIDER_AUDIT_SINK)
+      .useValue({ record: vi.fn().mockResolvedValue(undefined) })
+      .overrideProvider(RUNTIME_APPROVAL_VERIFIER)
+      .useValue({ consume: vi.fn().mockResolvedValue(false) })
+      .overrideProvider(DurableSessionService)
+      .useValue({})
+      .overrideProvider(DurableSessionRepository)
+      .useValue({})
+      .overrideProvider(AgentService)
+      .useValue({})
+      .overrideProvider(ProviderService)
+      .useValue({})
+      .overrideProvider(ProviderCredentialsService)
+      .useValue({})
+      .overrideProvider(RoutingService)
+      .useValue({})
+      .overrideProvider(RoutingEngineService)
+      .useValue({})
+      .overrideProvider(SkillLoaderService)
+      .useValue({})
+      .compile();
+
+    app = moduleRef.createNestApplication<NestFastifyApplication>(new FastifyAdapter());
+    await app.init();
+    await app.getHttpAdapter().getInstance().ready();
+  });
+
+  afterAll(async (): Promise<void> => {
+    await app?.close();
+  });
+
+  it('returns gateway denial responses from the actual guarded interaction routes', async (): Promise<void> => {
+    if (!app) throw new Error('Nest application did not initialize');
+
+    const attachDenied = await app.inject({
+      method: 'POST',
+      url: '/api/interaction/Nova/sessions/session-1/attach',
+      headers: { 'x-correlation-id': 'correlation-1' },
+      payload: { mode: 'read' },
+    });
+    expect(attachDenied.statusCode).toBe(401);
+
+    const sendDenied = await app.inject({
+      method: 'POST',
+      url: '/api/interaction/Nova/sessions/session-1/send',
+      headers: { cookie: 'session=trusted', 'x-correlation-id': 'correlation-1' },
+      payload: {},
+    });
+    expect(sendDenied.statusCode).toBe(403);
+    expect(sendDenied.json()).toMatchObject({
+      message: 'Content and idempotency key are required',
+    });
+
+    const stopDenied = await app.inject({
+      method: 'POST',
+      url: '/api/interaction/Nova/sessions/session-1/stop',
+      headers: { cookie: 'session=trusted', 'x-correlation-id': 'correlation-1' },
+      payload: {},
+    });
+    expect(stopDenied.statusCode).toBe(403);
+    expect(stopDenied.json()).toMatchObject({ message: 'Exact-action approval is required' });
+  });
+
+  it('requires authentication and reaches the Hermes provider registered by AgentModule', async (): Promise<void> => {
+    if (!app) throw new Error('Nest application did not initialize');
+    const registry = app.get(AGENT_RUNTIME_PROVIDER_REGISTRY);
+    expect(registry.get('runtime.hermes')).toBeInstanceOf(HermesRuntimeProvider);
+
+    const denied = await app.inject({
+      method: 'GET',
+      url: '/api/interaction/Nova/transitional-capabilities?provider=runtime.hermes',
+      headers: { 'x-correlation-id': 'correlation-1' },
+    });
+    expect(denied.statusCode).toBe(401);
+
+    const response = await app.inject({
+      method: 'GET',
+      url: '/api/interaction/Nova/transitional-capabilities?provider=runtime.hermes',
+      headers: { cookie: 'session=trusted', 'x-correlation-id': 'correlation-1' },
+    });
+    expect(response.statusCode).toBe(200);
+    expect(response.json()).toEqual([
+      { capability: 'kanban', status: 'unsupported' },
+      { capability: 'skills', status: 'unsupported' },
+      { capability: 'memory', status: 'unsupported' },
+      { capability: 'tools', status: 'unsupported' },
+      { capability: 'cron', status: 'unsupported' },
+    ]);
+  });
+});

apps/gateway/src/agent/hermes-runtime.transport.test.ts

@@ -0,0 +1,46 @@
+import { describe, expect, it, vi } from 'vitest';
+import { GatewayHermesRuntimeTransport } from './hermes-runtime.transport.js';
+
+const scope = {
+  actorId: 'owner-1',
+  tenantId: 'tenant-1',
+  channelId: 'cli',
+  correlationId: 'correlation-1',
+};
+
+describe('GatewayHermesRuntimeTransport', () => {
+  it('preserves a configured path prefix and authenticates the concrete runtime request', async () => {
+    const fetchFn = vi
+      .fn()
+      .mockResolvedValue(new Response(JSON.stringify(['session.list']), { status: 200 }));
+    const transport = new GatewayHermesRuntimeTransport(
+      'https://runtime.example.test/hermes',
+      'test-service-token',
+      fetchFn,
+    );
+
+    await expect(transport.capabilities(scope)).resolves.toEqual(['session.list']);
+
+    expect(fetchFn).toHaveBeenCalledWith(
+      new URL('https://runtime.example.test/hermes/capabilities'),
+      expect.objectContaining({
+        headers: expect.objectContaining({
+          authorization: 'Bearer test-service-token',
+          'x-mosaic-channel-id': 'cli',
+        }),
+      }),
+    );
+  });
+
+  it('rejects non-loopback HTTP runtime endpoints before sending identity headers', async () => {
+    const fetchFn = vi.fn();
+    const transport = new GatewayHermesRuntimeTransport(
+      'http://runtime.example.test/hermes',
+      'test-service-token',
+      fetchFn,
+    );
+
+    await expect(transport.capabilities(scope)).rejects.toThrow('requires HTTPS');
+    expect(fetchFn).not.toHaveBeenCalled();
+  });
+});

apps/gateway/src/agent/hermes-runtime.transport.ts

@@ -0,0 +1,121 @@
+import type { HermesLegacySession, HermesRuntimeTransport } from '@mosaicstack/agent';
+import type {
+  RuntimeAttachHandle,
+  RuntimeAttachMode,
+  RuntimeMessage,
+  RuntimeScope,
+  RuntimeStreamEvent,
+} from '@mosaicstack/types';
+
+/** Concrete HTTP transport for a configured legacy Hermes runtime endpoint. */
+export class GatewayHermesRuntimeTransport implements HermesRuntimeTransport {
+  constructor(
+    private readonly baseUrl = process.env['MOSAIC_HERMES_RUNTIME_URL']?.trim(),
+    private readonly serviceToken = process.env['MOSAIC_HERMES_RUNTIME_TOKEN']?.trim(),
+    private readonly fetchFn: typeof fetch = fetch,
+  ) {}
+
+  async capabilities(scope: RuntimeScope): Promise<string[]> {
+    return this.request<string[]>('/capabilities', scope);
+  }
+
+  async health(scope: RuntimeScope): Promise<{ status: string; detail?: string }> {
+    return this.request<{ status: string; detail?: string }>('/health', scope);
+  }
+
+  async sessions(scope: RuntimeScope): Promise<HermesLegacySession[]> {
+    return this.request<HermesLegacySession[]>('/sessions', scope);
+  }
+
+  async *stream(
+    sessionId: string,
+    cursor: string | undefined,
+    scope: RuntimeScope,
+  ): AsyncIterable<RuntimeStreamEvent> {
+    const params = new URLSearchParams(cursor ? { cursor } : {});
+    const events = await this.request<RuntimeStreamEvent[]>(
+      `/sessions/${encodeURIComponent(sessionId)}/stream?${params.toString()}`,
+      scope,
+    );
+    yield* events;
+  }
+
+  async send(sessionId: string, message: RuntimeMessage, scope: RuntimeScope): Promise<void> {
+    await this.request(`/sessions/${encodeURIComponent(sessionId)}/messages`, scope, {
+      method: 'POST',
+      body: message,
+    });
+  }
+
+  async attach(
+    sessionId: string,
+    mode: RuntimeAttachMode,
+    scope: RuntimeScope,
+  ): Promise<RuntimeAttachHandle> {
+    return this.request<RuntimeAttachHandle>(
+      `/sessions/${encodeURIComponent(sessionId)}/attach`,
+      scope,
+      {
+        method: 'POST',
+        body: { mode },
+      },
+    );
+  }
+
+  async detach(attachmentId: string, scope: RuntimeScope): Promise<void> {
+    await this.request(`/attachments/${encodeURIComponent(attachmentId)}`, scope, {
+      method: 'DELETE',
+    });
+  }
+
+  async terminate(sessionId: string, approvalRef: string, scope: RuntimeScope): Promise<void> {
+    await this.request(`/sessions/${encodeURIComponent(sessionId)}/terminate`, scope, {
+      method: 'POST',
+      body: { approvalRef },
+    });
+  }
+
+  private async request<T>(
+    path: string,
+    scope: RuntimeScope,
+    init: { method?: string; body?: unknown } = {},
+  ): Promise<T> {
+    if (!this.baseUrl || !this.serviceToken) {
+      throw new Error(
+        'MOSAIC_HERMES_RUNTIME_URL and MOSAIC_HERMES_RUNTIME_TOKEN must configure Hermes transport',
+      );
+    }
+    const endpoint = new URL(this.baseUrl);
+    if (endpoint.protocol !== 'https:' && !isLoopbackHttp(endpoint)) {
+      throw new Error('Hermes runtime transport requires HTTPS outside loopback');
+    }
+    const response = await this.fetchFn(
+      new URL(path.replace(/^\//, ''), `${endpoint.toString().replace(/\/$/, '')}/`),
+      {
+        method: init.method ?? 'GET',
+        headers: {
+          accept: 'application/json',
+          authorization: `Bearer ${this.serviceToken}`,
+          'x-mosaic-actor-id': scope.actorId,
+          'x-mosaic-tenant-id': scope.tenantId,
+          'x-mosaic-channel-id': scope.channelId,
+          'x-correlation-id': scope.correlationId,
+          ...(init.body ? { 'content-type': 'application/json' } : {}),
+        },
+        ...(init.body ? { body: JSON.stringify(init.body) } : {}),
+      },
+    );
+    if (!response.ok) throw new Error(`Hermes runtime request failed: ${response.status}`);
+    if (response.status === 204) return undefined as T;
+    return (await response.json()) as T;
+  }
+}
+
+function isLoopbackHttp(endpoint: URL): boolean {
+  return (
+    endpoint.protocol === 'http:' &&
+    (endpoint.hostname === 'localhost' ||
+      endpoint.hostname === '127.0.0.1' ||
+      endpoint.hostname === '::1')
+  );
+}

apps/gateway/src/agent/interaction.controller.test.ts

@@ -0,0 +1,263 @@
+import { createGatewayRuntimeProviderRegistry } from './agent.module.js';
+import { firstValueFrom } from 'rxjs';
+import { afterEach, describe, expect, it, vi } from 'vitest';
+import {
+  RuntimeApprovalDeniedError,
+  RuntimeProviderService,
+} from './runtime-provider-registry.service.js';
+import { RuntimeApprovalDeniedFilter } from './runtime-approval-denied.filter.js';
+import { InteractionController } from './interaction.controller.js';
+
+describe('InteractionController', (): void => {
+  afterEach(() => vi.restoreAllMocks());
+
+  it('maps a denied runtime approval to Fastify HTTP 403', () => {
+    const send = vi.fn();
+    const status = vi.fn().mockReturnValue({ send });
+    const response = { status };
+    const host = { switchToHttp: () => ({ getResponse: () => response }) };
+
+    new RuntimeApprovalDeniedFilter().catch(new RuntimeApprovalDeniedError(), host as never);
+
+    expect(status).toHaveBeenCalledWith(403);
+    expect(send).toHaveBeenCalledWith({
+      statusCode: 403,
+      message: 'Runtime termination approval denied',
+    });
+  });
+
+  it('honors a differently named configured instance without a code change', async () => {
+    const prior = process.env['MOSAIC_AGENT_NAME'];
+    process.env['MOSAIC_AGENT_NAME'] = 'Nova';
+    const runtime = { listSessions: vi.fn().mockResolvedValue([]) };
+    const controller = new InteractionController(runtime as never, {} as never);
+
+    await expect(
+      controller.sessions('Nova', 'fleet', { id: 'owner', tenantId: 'team' }, 'corr-1'),
+    ).resolves.toEqual([]);
+    await expect(
+      controller.sessions('Other', 'fleet', { id: 'owner', tenantId: 'team' }, 'corr-1'),
+    ).rejects.toThrow('Interaction agent is not configured');
+
+    if (prior === undefined) delete process.env['MOSAIC_AGENT_NAME'];
+    else process.env['MOSAIC_AGENT_NAME'] = prior;
+  });
+
+  it('reaches the registered Hermes provider through the authenticated transitional matrix route', async () => {
+    process.env['MOSAIC_AGENT_NAME'] = 'Nova';
+    const registry = createGatewayRuntimeProviderRegistry();
+    const runtime = new RuntimeProviderService(
+      registry,
+      { record: vi.fn().mockResolvedValue(undefined) },
+      { consume: vi.fn().mockResolvedValue(false) },
+    );
+    const controller = new InteractionController(runtime, {} as never);
+
+    await expect(
+      controller.transitionalCapabilities(
+        'Nova',
+        'runtime.hermes',
+        { id: 'owner', tenantId: 'team' },
+        'corr-1',
+      ),
+    ).resolves.toEqual([
+      { capability: 'kanban', status: 'unsupported' },
+      { capability: 'skills', status: 'unsupported' },
+      { capability: 'memory', status: 'unsupported' },
+      { capability: 'tools', status: 'unsupported' },
+      { capability: 'cron', status: 'unsupported' },
+    ]);
+  });
+
+  it('rejects a request without the non-simple correlation header', async () => {
+    process.env['MOSAIC_AGENT_NAME'] = 'Nova';
+    const controller = new InteractionController({ listSessions: vi.fn() } as never, {} as never);
+
+    await expect(controller.sessions('Nova', 'fleet', { id: 'owner' })).rejects.toThrow(
+      'X-Correlation-Id is required',
+    );
+  });
+
+  it('enrolls a visible runtime session under the cross-surface conversation handle', async () => {
+    process.env['MOSAIC_AGENT_NAME'] = 'Nova';
+    const runtime = {
+      listSessions: vi.fn().mockResolvedValue([{ id: 'runtime-1' }]),
+    };
+    const durable = { enroll: vi.fn().mockResolvedValue(undefined) };
+    const controller = new InteractionController(runtime as never, durable as never);
+
+    await expect(
+      controller.enroll(
+        'Nova',
+        'conversation-1',
+        { providerId: 'fleet', runtimeSessionId: 'runtime-1' },
+        { id: 'owner', tenantId: 'team' },
+        'corr-1',
+      ),
+    ).resolves.toEqual({ status: 'enrolled', sessionId: 'conversation-1' });
+    expect(durable.enroll).toHaveBeenCalledWith(
+      {
+        agentName: 'Nova',
+        sessionId: 'conversation-1',
+        tenantId: 'team',
+        ownerId: 'owner',
+        providerId: 'fleet',
+        runtimeSessionId: 'runtime-1',
+      },
+      expect.objectContaining({ correlationId: 'corr-1' }),
+    );
+  });
+
+  it('rejects an invalid attach mode before invoking a provider', async () => {
+    process.env['MOSAIC_AGENT_NAME'] = 'Nova';
+    const controller = new InteractionController({ attach: vi.fn() } as never, {} as never);
+
+    await expect(
+      controller.attach('Nova', 'durable-1', { mode: 'write' as never }, { id: 'owner' }, 'corr-1'),
+    ).rejects.toThrow('Interaction attach mode is invalid');
+  });
+
+  it('resumes a durable session by attaching and streaming its runtime events', async () => {
+    process.env['MOSAIC_AGENT_NAME'] = 'Nova';
+    const runtimeEvent = {
+      type: 'message.delta' as const,
+      sessionId: 'runtime-1',
+      cursor: 'cursor-1',
+      occurredAt: '2026-07-13T00:00:00.000Z',
+      content: 'resumed',
+    };
+    const runtime = {
+      attach: vi.fn().mockResolvedValue({ attachmentId: 'attach-1', sessionId: 'runtime-1' }),
+      streamSession: vi.fn(async function* () {
+        yield runtimeEvent;
+      }),
+    };
+    const durable = {
+      getSnapshot: vi.fn().mockResolvedValue({
+        identity: { agentName: 'Nova', providerId: 'fleet', runtimeSessionId: 'runtime-1' },
+      }),
+    };
+    const controller = new InteractionController(runtime as never, durable as never);
+
+    await controller.attach('Nova', 'conversation-1', { mode: 'read' }, { id: 'owner' }, 'corr-1');
+    await expect(
+      firstValueFrom(
+        controller.stream('Nova', 'conversation-1', undefined, { id: 'owner' }, 'corr-1'),
+      ),
+    ).resolves.toEqual({ data: runtimeEvent });
+
+    expect(runtime.attach).toHaveBeenCalledWith(
+      'fleet',
+      'runtime-1',
+      'read',
+      expect.objectContaining({ correlationId: 'corr-1' }),
+    );
+    expect(runtime.streamSession).toHaveBeenCalledWith(
+      'fleet',
+      'runtime-1',
+      undefined,
+      expect.objectContaining({ correlationId: 'corr-1' }),
+    );
+  });
+
+  it('does not create a runtime stream after the SSE subscriber disconnects during snapshot lookup', async () => {
+    process.env['MOSAIC_AGENT_NAME'] = 'Nova';
+    let resolveSnapshot!: (value: { identity: Record<string, string> }) => void;
+    const snapshot = new Promise<{ identity: Record<string, string> }>((resolve) => {
+      resolveSnapshot = resolve;
+    });
+    const runtime = { streamSession: vi.fn() };
+    const durable = { getSnapshot: vi.fn().mockReturnValue(snapshot) };
+    const controller = new InteractionController(runtime as never, durable as never);
+
+    const subscription = controller
+      .stream('Nova', 'conversation-1', undefined, { id: 'owner' }, 'corr-1')
+      .subscribe();
+    subscription.unsubscribe();
+    resolveSnapshot({
+      identity: { agentName: 'Nova', providerId: 'fleet', runtimeSessionId: 'runtime-1' },
+    });
+    await new Promise((resolve) => setTimeout(resolve, 0));
+
+    expect(runtime.streamSession).not.toHaveBeenCalled();
+  });
+
+  it.each([
+    ['wrong actor', { getSnapshot: vi.fn().mockRejectedValue(new Error('scope mismatch')) }],
+    [
+      'session-agent mismatch',
+      {
+        getSnapshot: vi.fn().mockResolvedValue({
+          identity: { agentName: 'Other', providerId: 'fleet', runtimeSessionId: 'runtime-1' },
+        }),
+      },
+    ],
+  ])('denies a CLI stop for %s', async (_reason, durable) => {
+    process.env['MOSAIC_AGENT_NAME'] = 'Nova';
+    const runtime = { terminate: vi.fn().mockResolvedValue(undefined) };
+    const controller = new InteractionController(runtime as never, durable as never);
+
+    await expect(
+      controller.stop(
+        'Nova',
+        'durable-1',
+        { approvalRef: 'approval-1' },
+        { id: 'owner' },
+        'corr-1',
+      ),
+    ).rejects.toBeDefined();
+    expect(runtime.terminate).not.toHaveBeenCalled();
+  });
+
+  it('surfaces a denied runtime approval to the CLI interaction surface', async () => {
+    process.env['MOSAIC_AGENT_NAME'] = 'Nova';
+    const runtime = {
+      terminate: vi.fn().mockRejectedValue(new Error('Runtime termination approval denied')),
+    };
+    const durable = {
+      getSnapshot: vi.fn().mockResolvedValue({
+        identity: { agentName: 'Nova', providerId: 'fleet', runtimeSessionId: 'runtime-1' },
+      }),
+    };
+    const controller = new InteractionController(runtime as never, durable as never);
+
+    await expect(
+      controller.stop(
+        'Nova',
+        'durable-1',
+        { approvalRef: 'approval-1' },
+        { id: 'owner' },
+        'corr-1',
+      ),
+    ).rejects.toThrow('Runtime termination approval denied');
+  });
+
+  it('uses the durable session identity and runtime registry for an approved stop', async () => {
+    process.env['MOSAIC_AGENT_NAME'] = 'Nova';
+    const runtime = { terminate: vi.fn().mockResolvedValue(undefined) };
+    const durable = {
+      getSnapshot: vi.fn().mockResolvedValue({
+        identity: { agentName: 'Nova', providerId: 'fleet', runtimeSessionId: 'runtime-1' },
+      }),
+    };
+    const controller = new InteractionController(runtime as never, durable as never);
+
+    await controller.stop(
+      'Nova',
+      'durable-1',
+      { approvalRef: 'approval-1' },
+      { id: 'owner' },
+      'corr-1',
+    );
+
+    expect(runtime.terminate).toHaveBeenCalledWith(
+      'fleet',
+      'runtime-1',
+      'approval-1',
+      expect.objectContaining({
+        correlationId: 'corr-1',
+        actorScope: { userId: 'owner', tenantId: 'owner' },
+      }),
+    );
+  });
+});

apps/gateway/src/agent/interaction.controller.ts

@@ -0,0 +1,293 @@
+import {
+  Body,
+  Controller,
+  ForbiddenException,
+  Get,
+  Headers,
+  Sse,
+  Inject,
+  Param,
+  Post,
+  Query,
+  UseGuards,
+  UseFilters,
+} from '@nestjs/common';
+import type { RuntimeAttachMode, RuntimeStreamEvent } from '@mosaicstack/types';
+import { Observable } from 'rxjs';
+import { AuthGuard } from '../auth/auth.guard.js';
+import { CurrentUser } from '../auth/current-user.decorator.js';
+import { scopeFromUser, type AuthenticatedUserLike } from '../auth/session-scope.js';
+import { DurableSessionService } from './durable-session.service.js';
+import { RuntimeApprovalDeniedFilter } from './runtime-approval-denied.filter.js';
+import {
+  RuntimeProviderService,
+  type RuntimeProviderRequestContext,
+} from './runtime-provider-registry.service.js';
+
+/**
+ * Authenticated HTTP boundary for operator interaction clients. Identity is
+ * selected from deployment configuration, never a client-side command name.
+ */
+@Controller('api/interaction/:agentName')
+@UseGuards(AuthGuard)
+@UseFilters(RuntimeApprovalDeniedFilter)
+export class InteractionController {
+  constructor(
+    @Inject(RuntimeProviderService) private readonly runtime: RuntimeProviderService,
+    @Inject(DurableSessionService) private readonly durable: DurableSessionService,
+  ) {}
+
+  @Get('sessions')
+  async sessions(
+    @Param('agentName') agentName: string,
+    @Query('provider') providerId: string,
+    @CurrentUser() user: AuthenticatedUserLike,
+    @Headers('x-correlation-id') correlationId?: string,
+  ) {
+    this.assertConfiguredAgent(agentName);
+    return this.runtime.listSessions(
+      this.requiredProvider(providerId),
+      this.context(user, correlationId),
+    );
+  }
+
+  @Get('transitional-capabilities')
+  async transitionalCapabilities(
+    @Param('agentName') agentName: string,
+    @Query('provider') providerId: string,
+    @CurrentUser() user: AuthenticatedUserLike,
+    @Headers('x-correlation-id') correlationId?: string,
+  ) {
+    this.assertConfiguredAgent(agentName);
+    return this.runtime.transitionalCapabilityMatrix(
+      this.requiredProvider(providerId),
+      this.context(user, correlationId),
+    );
+  }
+
+  @Get('tree')
+  async tree(
+    @Param('agentName') agentName: string,
+    @Query('provider') providerId: string,
+    @CurrentUser() user: AuthenticatedUserLike,
+    @Headers('x-correlation-id') correlationId?: string,
+  ) {
+    this.assertConfiguredAgent(agentName);
+    return this.runtime.getSessionTree(
+      this.requiredProvider(providerId),
+      this.context(user, correlationId),
+    );
+  }
+
+  /**
+   * Bind an existing, authorized runtime session to the stable conversation ID.
+   * This is the lifecycle boundary where both runtime identifiers are known.
+   */
+  @Post('sessions/:sessionId/enroll')
+  async enroll(
+    @Param('agentName') agentName: string,
+    @Param('sessionId') sessionId: string,
+    @Body() body: { providerId?: string; runtimeSessionId?: string } = {},
+    @CurrentUser() user: AuthenticatedUserLike,
+    @Headers('x-correlation-id') correlationId?: string,
+  ) {
+    this.assertConfiguredAgent(agentName);
+    const providerId = this.requiredProvider(body.providerId ?? '');
+    const runtimeSessionId = body.runtimeSessionId?.trim();
+    if (!runtimeSessionId) throw new ForbiddenException('Runtime session identity is required');
+    const context = this.context(user, correlationId);
+    const sessions = await this.runtime.listSessions(providerId, context);
+    if (!sessions.some((session): boolean => session.id === runtimeSessionId)) {
+      throw new ForbiddenException('Runtime session is not visible to this actor');
+    }
+    await this.durable.enroll(
+      {
+        agentName,
+        sessionId,
+        tenantId: context.actorScope.tenantId,
+        ownerId: context.actorScope.userId,
+        providerId,
+        runtimeSessionId,
+      },
+      context,
+    );
+    return { status: 'enrolled', sessionId };
+  }
+
+  @Post('sessions/:sessionId/attach')
+  async attach(
+    @Param('agentName') agentName: string,
+    @Param('sessionId') sessionId: string,
+    @Body() body: { mode?: RuntimeAttachMode } = {},
+    @CurrentUser() user: AuthenticatedUserLike,
+    @Headers('x-correlation-id') correlationId?: string,
+  ) {
+    this.assertConfiguredAgent(agentName);
+    const context = this.context(user, correlationId);
+    const mode = body.mode ?? 'read';
+    if (mode !== 'read' && mode !== 'control') {
+      throw new ForbiddenException('Interaction attach mode is invalid');
+    }
+    const snapshot = await this.durable.getSnapshot(sessionId, context);
+    this.assertSessionAgent(snapshot.identity.agentName, agentName);
+    return this.runtime.attach(
+      snapshot.identity.providerId,
+      snapshot.identity.runtimeSessionId,
+      mode,
+      context,
+    );
+  }
+
+  @Sse('sessions/:sessionId/stream')
+  stream(
+    @Param('agentName') agentName: string,
+    @Param('sessionId') sessionId: string,
+    @Query('cursor') cursor: string | undefined,
+    @CurrentUser() user: AuthenticatedUserLike,
+    @Headers('x-correlation-id') correlationId?: string,
+  ): Observable<{ data: RuntimeStreamEvent }> {
+    this.assertConfiguredAgent(agentName);
+    const context = this.context(user, correlationId);
+    return new Observable((subscriber) => {
+      let iterator: AsyncIterator<RuntimeStreamEvent> | undefined;
+      let cancelled = false;
+      void (async (): Promise<void> => {
+        try {
+          const snapshot = await this.durable.getSnapshot(sessionId, context);
+          if (cancelled || subscriber.closed) return;
+          this.assertSessionAgent(snapshot.identity.agentName, agentName);
+          iterator = this.runtime
+            .streamSession(
+              snapshot.identity.providerId,
+              snapshot.identity.runtimeSessionId,
+              cursor?.trim() || undefined,
+              context,
+            )
+            [Symbol.asyncIterator]();
+          if (cancelled || subscriber.closed) {
+            await iterator.return?.();
+            return;
+          }
+          while (!cancelled && !subscriber.closed) {
+            const next = await iterator.next();
+            if (next.done || cancelled || subscriber.closed) break;
+            subscriber.next({ data: next.value });
+          }
+          if (!subscriber.closed) subscriber.complete();
+        } catch (error: unknown) {
+          if (!subscriber.closed) subscriber.error(error);
+        }
+      })();
+      return (): void => {
+        cancelled = true;
+        void iterator?.return?.();
+      };
+    });
+  }
+
+  @Post('sessions/:sessionId/send')
+  async send(
+    @Param('agentName') agentName: string,
+    @Param('sessionId') sessionId: string,
+    @Body() body: { content?: string; idempotencyKey?: string } = {},
+    @CurrentUser() user: AuthenticatedUserLike,
+    @Headers('x-correlation-id') correlationId?: string,
+  ) {
+    this.assertConfiguredAgent(agentName);
+    if (!body.content?.trim() || !body.idempotencyKey?.trim()) {
+      throw new ForbiddenException('Content and idempotency key are required');
+    }
+    const context = this.context(user, correlationId);
+    const snapshot = await this.durable.getSnapshot(sessionId, context);
+    this.assertSessionAgent(snapshot.identity.agentName, agentName);
+    const input = {
+      sessionId,
+      content: body.content,
+      idempotencyKey: body.idempotencyKey,
+      correlationId: context.correlationId,
+      context,
+    };
+    await this.durable.queueProviderSend(input);
+    await this.durable.dispatchProviderOutbox(sessionId, input);
+    return { status: 'queued', sessionId };
+  }
+
+  @Post('sessions/:sessionId/stop')
+  async stop(
+    @Param('agentName') agentName: string,
+    @Param('sessionId') sessionId: string,
+    @Body() body: { approvalRef?: string } = {},
+    @CurrentUser() user: AuthenticatedUserLike,
+    @Headers('x-correlation-id') correlationId?: string,
+  ) {
+    this.assertConfiguredAgent(agentName);
+    if (!body.approvalRef?.trim())
+      throw new ForbiddenException('Exact-action approval is required');
+    const context = this.context(user, correlationId);
+    const snapshot = await this.durable.getSnapshot(sessionId, context);
+    this.assertSessionAgent(snapshot.identity.agentName, agentName);
+    await this.runtime.terminate(
+      snapshot.identity.providerId,
+      snapshot.identity.runtimeSessionId,
+      body.approvalRef,
+      context,
+    );
+    return { status: 'stopped', sessionId };
+  }
+
+  @Post('sessions/:sessionId/recover')
+  async recover(
+    @Param('agentName') agentName: string,
+    @Param('sessionId') sessionId: string,
+    @CurrentUser() user: AuthenticatedUserLike,
+    @Headers('x-correlation-id') correlationId?: string,
+  ) {
+    this.assertConfiguredAgent(agentName);
+    const context = this.context(user, correlationId);
+    const snapshot = await this.durable.getSnapshot(sessionId, context);
+    this.assertSessionAgent(snapshot.identity.agentName, agentName);
+    await this.durable.recoverProviderSession(sessionId, {
+      sessionId,
+      content: '',
+      idempotencyKey: `recovery:${context.correlationId}`,
+      correlationId: context.correlationId,
+      context,
+    });
+    return { status: 'recovered', sessionId };
+  }
+
+  private context(
+    user: AuthenticatedUserLike,
+    correlationId?: string,
+  ): RuntimeProviderRequestContext {
+    const requestCorrelationId = correlationId?.trim();
+    // This non-simple request header is mandatory for mutations. Browser
+    // cross-origin requests cannot set it without a CORS preflight, and the
+    // gateway's allowlist rejects untrusted origins before the handler runs.
+    if (!requestCorrelationId) {
+      throw new ForbiddenException('X-Correlation-Id is required');
+    }
+    return {
+      actorScope: scopeFromUser(user),
+      channelId: 'cli',
+      correlationId: requestCorrelationId,
+    };
+  }
+
+  private assertConfiguredAgent(agentName: string): void {
+    const configured = process.env['MOSAIC_AGENT_NAME']?.trim();
+    if (!configured || configured !== agentName) {
+      throw new ForbiddenException('Interaction agent is not configured for this request');
+    }
+  }
+
+  private assertSessionAgent(sessionAgentName: string, agentName: string): void {
+    if (sessionAgentName !== agentName)
+      throw new ForbiddenException('Interaction session identity mismatch');
+  }
+
+  private requiredProvider(providerId: string): string {
+    if (!providerId?.trim()) throw new ForbiddenException('Runtime provider is required');
+    return providerId;
+  }
+}

apps/gateway/src/agent/provider-credentials.service.ts

@@ -1,62 +1,10 @@
 import { Inject, Injectable, Logger } from '@nestjs/common';
-import { createCipheriv, createDecipheriv, createHash, randomBytes } from 'node:crypto';
+import { seal, unseal } from '@mosaicstack/auth';
 import type { Db } from '@mosaicstack/db';
 import { providerCredentials, eq, and } from '@mosaicstack/db';
 import { DB } from '../database/database.module.js';
 import type { ProviderCredentialSummaryDto } from './provider-credentials.dto.js';
 
-const ALGORITHM = 'aes-256-gcm';
-const IV_LENGTH = 12; // 96-bit IV for GCM
-const TAG_LENGTH = 16; // 128-bit auth tag
-
-/**
- * Derive a 32-byte AES-256 key from BETTER_AUTH_SECRET using SHA-256.
- * The secret is assumed to be set in the environment.
- */
-function deriveEncryptionKey(): Buffer {
-  const secret = process.env['BETTER_AUTH_SECRET'];
-  if (!secret) {
-    throw new Error('BETTER_AUTH_SECRET is not set — cannot derive encryption key');
-  }
-  return createHash('sha256').update(secret).digest();
-}
-
-/**
- * Encrypt a plain-text value using AES-256-GCM.
- * Output format: base64(iv + authTag + ciphertext)
- */
-function encrypt(plaintext: string): string {
-  const key = deriveEncryptionKey();
-  const iv = randomBytes(IV_LENGTH);
-  const cipher = createCipheriv(ALGORITHM, key, iv);
-
-  const encrypted = Buffer.concat([cipher.update(plaintext, 'utf8'), cipher.final()]);
-  const authTag = cipher.getAuthTag();
-
-  // Combine iv (12) + authTag (16) + ciphertext and base64-encode
-  const combined = Buffer.concat([iv, authTag, encrypted]);
-  return combined.toString('base64');
-}
-
-/**
- * Decrypt a value encrypted by `encrypt()`.
- * Throws on authentication failure (tampered data).
- */
-function decrypt(encoded: string): string {
-  const key = deriveEncryptionKey();
-  const combined = Buffer.from(encoded, 'base64');
-
-  const iv = combined.subarray(0, IV_LENGTH);
-  const authTag = combined.subarray(IV_LENGTH, IV_LENGTH + TAG_LENGTH);
-  const ciphertext = combined.subarray(IV_LENGTH + TAG_LENGTH);
-
-  const decipher = createDecipheriv(ALGORITHM, key, iv);
-  decipher.setAuthTag(authTag);
-
-  const decrypted = Buffer.concat([decipher.update(ciphertext), decipher.final()]);
-  return decrypted.toString('utf8');
-}
-
 @Injectable()
 export class ProviderCredentialsService {
   private readonly logger = new Logger(ProviderCredentialsService.name);
@@ -74,7 +22,7 @@ export class ProviderCredentialsService {
     value: string,
     metadata?: Record<string, unknown>,
   ): Promise<void> {
-    const encryptedValue = encrypt(value);
+    const encryptedValue = seal(value);
 
     await this.db
       .insert(providerCredentials)
@@ -122,7 +70,7 @@ export class ProviderCredentialsService {
     }
 
     try {
-      return decrypt(row.encryptedValue);
+      return unseal(row.encryptedValue);
     } catch (err) {
       this.logger.error(
         `Failed to decrypt credential for user=${userId} provider=${provider}`,

apps/gateway/src/agent/provider.service.ts

@@ -107,8 +107,7 @@ export class ProviderService implements OnModuleInit, OnModuleDestroy {
    * Interval is configurable via PROVIDER_HEALTH_INTERVAL env (seconds, default 60).
    */
   private startHealthCheckScheduler(): void {
-    const intervalSecs =
-      parseInt(process.env['PROVIDER_HEALTH_INTERVAL'] ?? '', 10) || DEFAULT_HEALTH_INTERVAL_SECS;
+    const intervalSecs = this.effectiveHealthCheckIntervalSecs();
     const intervalMs = intervalSecs * 1000;
 
     // Run an initial check immediately (non-blocking)
@@ -176,6 +175,28 @@ export class ProviderService implements OnModuleInit, OnModuleDestroy {
     });
   }
 
+  /**
+   * Returns the effective provider operational policy without credentials,
+   * endpoints, request content, or provider error details.
+   */
+  getEffectivePolicyStatus(): {
+    healthCheckIntervalSecs: number;
+    configuredProviders: string[];
+    availableModelCount: number;
+  } {
+    return {
+      healthCheckIntervalSecs: this.effectiveHealthCheckIntervalSecs(),
+      configuredProviders: this.adapters.map((adapter) => adapter.name),
+      availableModelCount: this.registry?.getAvailable().length ?? 0,
+    };
+  }
+
+  private effectiveHealthCheckIntervalSecs(): number {
+    return (
+      parseInt(process.env['PROVIDER_HEALTH_INTERVAL'] ?? '', 10) || DEFAULT_HEALTH_INTERVAL_SECS
+    );
+  }
+
   // ---------------------------------------------------------------------------
   // Adapter-pattern API
   // ---------------------------------------------------------------------------

apps/gateway/src/agent/providers.controller.test.ts

@@ -0,0 +1,46 @@
+import { describe, expect, it, vi } from 'vitest';
+import { ProvidersController } from './providers.controller.js';
+
+describe('ProvidersController operational status', (): void => {
+  it('reports provider latency and effective policy without exposing provider error details', (): void => {
+    const providerService = {
+      getProvidersHealth: vi.fn(() => [
+        {
+          name: 'fleet',
+          status: 'down',
+          latencyMs: 42,
+          lastChecked: '2026-07-12T00:00:00.000Z',
+          modelCount: 0,
+          error: 'credential-canary=secret-value',
+        },
+      ]),
+      getEffectivePolicyStatus: vi.fn(() => ({
+        healthCheckIntervalSecs: 60,
+        configuredProviders: ['fleet'],
+        availableModelCount: 0,
+      })),
+    };
+    const controller = new ProvidersController(providerService as never, {} as never, {} as never);
+
+    const status = controller.status();
+
+    expect(status).toEqual({
+      providers: [
+        {
+          name: 'fleet',
+          status: 'down',
+          latencyMs: 42,
+          lastChecked: '2026-07-12T00:00:00.000Z',
+          modelCount: 0,
+          errorCode: 'provider_unavailable',
+        },
+      ],
+      effectivePolicy: {
+        healthCheckIntervalSecs: 60,
+        configuredProviders: ['fleet'],
+        availableModelCount: 0,
+      },
+    });
+    expect(JSON.stringify(status)).not.toContain('secret-value');
+  });
+});

apps/gateway/src/agent/providers.controller.ts

@@ -33,7 +33,20 @@ export class ProvidersController {
 
   @Get('health')
   health() {
-    return { providers: this.providerService.getProvidersHealth() };
+    return { providers: this.safeProviderHealth() };
+  }
+
+  /**
+   * Safe operational status for troubleshooting and readiness checks. Provider
+   * errors are reduced to a stable code so credentials and remote responses
+   * cannot leak through this endpoint.
+   */
+  @Get('status')
+  status() {
+    return {
+      providers: this.safeProviderHealth(),
+      effectivePolicy: this.providerService.getEffectivePolicyStatus(),
+    };
   }
 
   @Post('test')
@@ -51,6 +64,13 @@ export class ProvidersController {
     return this.routingService.rank(criteria);
   }
 
+  private safeProviderHealth() {
+    return this.providerService.getProvidersHealth().map(({ error, ...provider }) => ({
+      ...provider,
+      ...(error ? { errorCode: 'provider_unavailable' } : {}),
+    }));
+  }
+
   // ── Credential CRUD ──────────────────────────────────────────────────────
 
   /**

apps/gateway/src/agent/routing/routing-e2e.test.ts

@@ -8,6 +8,7 @@
  * to avoid real I/O — they verify the complete classify → match → decide path.
  */
 import { describe, it, expect, vi } from 'vitest';
+import type { ProviderHealthStatus } from '@mosaicstack/types';
 import { RoutingEngineService } from './routing-engine.service.js';
 import { DEFAULT_ROUTING_RULES } from '../routing/default-rules.js';
 import type { RoutingRule } from './routing.types.js';
@@ -17,7 +18,7 @@ import type { RoutingRule } from './routing.types.js';
 /** Build a RoutingEngineService backed by the given rule set and health map. */
 function makeService(
   rules: RoutingRule[],
-  healthMap: Record<string, { status: string }>,
+  healthMap: Record<string, { status: ProviderHealthStatus }>,
 ): RoutingEngineService {
   const mockDb = {
     select: vi.fn().mockReturnValue({
@@ -67,11 +68,11 @@ function defaultRules(): RoutingRule[] {
 }
 
 /** A health map where anthropic, openai, and zai are all healthy. */
-const allHealthy: Record<string, { status: string }> = {
-  anthropic: { status: 'up' },
-  openai: { status: 'up' },
-  zai: { status: 'up' },
-  ollama: { status: 'up' },
+const allHealthy: Record<string, { status: ProviderHealthStatus }> = {
+  anthropic: { status: 'healthy' },
+  openai: { status: 'healthy' },
+  zai: { status: 'healthy' },
+  ollama: { status: 'healthy' },
 };
 
 // ─── M4-013 E2E tests ─────────────────────────────────────────────────────────
@@ -212,10 +213,10 @@ describe('M4-013: routing end-to-end pipeline', () => {
     // Let's use a simple coding message to target Simple coding → Codex (openai)
     const message = 'implement a sort function';
 
-    const unhealthyHealth = {
+    const unhealthyHealth: Record<string, { status: ProviderHealthStatus }> = {
       anthropic: { status: 'down' },
-      openai: { status: 'up' },
-      zai: { status: 'up' },
+      openai: { status: 'healthy' },
+      zai: { status: 'healthy' },
       ollama: { status: 'down' },
     };
 

apps/gateway/src/agent/routing/routing-engine.service.ts

@@ -1,5 +1,6 @@
 import { Inject, Injectable, Logger } from '@nestjs/common';
 import { routingRules, type Db, and, asc, eq, or } from '@mosaicstack/db';
+import type { ProviderHealthStatus } from '@mosaicstack/types';
 import { DB } from '../../database/database.module.js';
 import { ProviderService } from '../provider.service.js';
 import { classifyTask } from './task-classifier.js';
@@ -49,7 +50,7 @@ export class RoutingEngineService {
   async resolve(
     message: string,
     userId?: string,
-    availableProviders?: Record<string, { status: string }>,
+    availableProviders?: Record<string, { status: ProviderHealthStatus }>,
   ): Promise<RoutingDecision> {
     const classification = classifyTask(message);
     this.logger.debug(
@@ -69,9 +70,8 @@ export class RoutingEngineService {
       if (!this.matchConditions(rule, classification)) continue;
 
       const providerStatus = health[rule.action.provider]?.status;
-      const isHealthy = providerStatus === 'up' || providerStatus === 'ok';
 
-      if (!isHealthy) {
+      if (!this.isRoutable(providerStatus)) {
         this.logger.debug(
           `Rule "${rule.name}" matched but provider "${rule.action.provider}" is unhealthy (status: ${providerStatus ?? 'unknown'})`,
         );
@@ -111,6 +111,10 @@ export class RoutingEngineService {
 
   // ─── Private helpers ───────────────────────────────────────────────────────
 
+  private isRoutable(status: ProviderHealthStatus | undefined): boolean {
+    return status === 'healthy' || status === 'degraded';
+  }
+
   private evaluateCondition(
     condition: RoutingCondition,
     classification: TaskClassification,
@@ -186,11 +190,12 @@ export class RoutingEngineService {
    * Walk the fallback chain and return the first healthy provider/model pair.
    * If none are healthy, return the first entry unconditionally (last resort).
    */
-  private applyFallbackChain(health: Record<string, { status: string }>): RoutingDecision {
+  private applyFallbackChain(
+    health: Record<string, { status: ProviderHealthStatus }>,
+  ): RoutingDecision {
     for (const candidate of FALLBACK_CHAIN) {
       const providerStatus = health[candidate.provider]?.status;
-      const isHealthy = providerStatus === 'up' || providerStatus === 'ok';
-      if (isHealthy) {
+      if (this.isRoutable(providerStatus)) {
         this.logger.debug(`Fallback resolved: ${candidate.provider}/${candidate.model}`);
         return {
           provider: candidate.provider,

apps/gateway/src/agent/routing/routing-engine.test.ts

@@ -1,4 +1,5 @@
 import { describe, it, expect, vi, beforeEach } from 'vitest';
+import type { ProviderHealthStatus } from '@mosaicstack/types';
 import { RoutingEngineService } from './routing-engine.service.js';
 import type { RoutingRule, TaskClassification } from './routing.types.js';
 
@@ -29,7 +30,7 @@ function makeClassification(overrides: Partial<TaskClassification> = {}): TaskCl
 /** Build a minimal RoutingEngineService with mocked DB and ProviderService. */
 function makeService(
   rules: RoutingRule[] = [],
-  healthMap: Record<string, { status: string }> = {},
+  healthMap: Record<string, { status: ProviderHealthStatus }> = {},
 ): RoutingEngineService {
   const mockDb = {
     select: vi.fn().mockReturnValue({
@@ -217,7 +218,10 @@ describe('RoutingEngineService.resolve — priority ordering', () => {
       }),
     ];
 
-    const service = makeService(rules, { anthropic: { status: 'up' }, openai: { status: 'up' } });
+    const service = makeService(rules, {
+      anthropic: { status: 'healthy' },
+      openai: { status: 'healthy' },
+    });
 
     const decision = await service.resolve('implement a function');
     expect(decision.ruleName).toBe('high priority');
@@ -241,7 +245,10 @@ describe('RoutingEngineService.resolve — priority ordering', () => {
       }),
     ];
 
-    const service = makeService(rules, { anthropic: { status: 'up' }, openai: { status: 'up' } });
+    const service = makeService(rules, {
+      anthropic: { status: 'healthy' },
+      openai: { status: 'healthy' },
+    });
 
     const decision = await service.resolve('implement a function');
     expect(decision.ruleName).toBe('coding rule');
@@ -270,7 +277,7 @@ describe('RoutingEngineService.resolve — unhealthy provider handling', () => {
 
     const service = makeService(rules, {
       anthropic: { status: 'down' }, // primary is unhealthy
-      openai: { status: 'up' },
+      openai: { status: 'healthy' },
     });
 
     const decision = await service.resolve('implement a function');
@@ -290,7 +297,7 @@ describe('RoutingEngineService.resolve — unhealthy provider handling', () => {
     ];
 
     const service2 = makeService(unhealthyRules, {
-      anthropic: { status: 'up' },
+      anthropic: { status: 'healthy' },
       openai: { status: 'down' },
     });
 
@@ -306,7 +313,7 @@ describe('RoutingEngineService.resolve — unhealthy provider handling', () => {
 
     const service = makeService(rules, {
       anthropic: { status: 'down' }, // Sonnet is on anthropic — down
-      ollama: { status: 'up' }, // Haiku is also on anthropic — use Ollama as next
+      ollama: { status: 'healthy' }, // Haiku is also on anthropic — use Ollama as next
     });
 
     const decision = await service.resolve('hello there');
@@ -345,7 +352,7 @@ describe('RoutingEngineService.resolve — empty conditions (fallback rule)', ()
       }),
     ];
 
-    const service = makeService(rules, { anthropic: { status: 'up' } });
+    const service = makeService(rules, { anthropic: { status: 'healthy' } });
 
     const decision = await service.resolve('completely unrelated message xyz');
     expect(decision.ruleName).toBe('catch-all');
@@ -369,7 +376,7 @@ describe('RoutingEngineService.resolve — empty conditions (fallback rule)', ()
       }),
     ];
 
-    const service = makeService(rules, { anthropic: { status: 'up' } });
+    const service = makeService(rules, { anthropic: { status: 'healthy' } });
 
     const codingDecision = await service.resolve('implement a function');
     expect(codingDecision.ruleName).toBe('specific coding rule');
@@ -401,7 +408,7 @@ describe('RoutingEngineService.resolve — disabled rules', () => {
       }),
     ];
 
-    const service = makeService(rules, { anthropic: { status: 'up' } });
+    const service = makeService(rules, { anthropic: { status: 'healthy' } });
 
     const decision = await service.resolve('implement a function');
     expect(decision.ruleName).toBe('enabled fallback');
@@ -452,9 +459,45 @@ describe('RoutingEngineService.resolve — availableProviders override', () => {
       ps: unknown,
     ) => RoutingEngineService)(mockDb, mockProviderService);
 
-    const preSupplied = { anthropic: { status: 'up' } };
+    const preSupplied: Record<string, { status: ProviderHealthStatus }> = {
+      anthropic: { status: 'healthy' },
+    };
     await service.resolve('implement a function', undefined, preSupplied);
 
     expect(mockHealthCheckAll).not.toHaveBeenCalled();
   });
 });
+
+// ─── resolve — canonical ProviderHealthStatus values ──────────────────────────
+
+describe('RoutingEngineService.resolve — canonical health status routing', () => {
+  it('routes healthy and degraded providers by rule, and falls through to fallback when down', async () => {
+    const codingRule = makeRule({
+      name: 'coding rule',
+      priority: 1,
+      conditions: [{ field: 'taskType', operator: 'eq', value: 'coding' }],
+      action: { provider: 'openai', model: 'gpt-4o' },
+    });
+
+    // healthy → selected by its own rule, not the fallback chain
+    const healthyService = makeService([codingRule], { openai: { status: 'healthy' } });
+    const healthyDecision = await healthyService.resolve('implement a function');
+    expect(healthyDecision.ruleName).toBe('coding rule');
+    expect(healthyDecision.provider).toBe('openai');
+
+    // down → rule is skipped as unroutable, falls through to the fallback chain
+    const downService = makeService([codingRule], {
+      openai: { status: 'down' },
+      anthropic: { status: 'healthy' },
+    });
+    const downDecision = await downService.resolve('implement a function');
+    expect(downDecision.ruleName).toBe('fallback');
+    expect(downDecision.provider).toBe('anthropic');
+
+    // degraded → still routable, selected by its own rule, not the fallback chain
+    const degradedService = makeService([codingRule], { openai: { status: 'degraded' } });
+    const degradedDecision = await degradedService.resolve('implement a function');
+    expect(degradedDecision.ruleName).toBe('coding rule');
+    expect(degradedDecision.provider).toBe('openai');
+  });
+});

apps/gateway/src/agent/runtime-approval-denied.filter.ts

@@ -0,0 +1,13 @@
+import { Catch, type ArgumentsHost, type ExceptionFilter } from '@nestjs/common';
+import { RuntimeApprovalDeniedError } from './runtime-provider-registry.service.js';
+
+/** Maps a consumed/missing runtime approval to a stable HTTP authorization response. */
+@Catch(RuntimeApprovalDeniedError)
+export class RuntimeApprovalDeniedFilter implements ExceptionFilter {
+  catch(_exception: RuntimeApprovalDeniedError, host: ArgumentsHost): void {
+    const response = host.switchToHttp().getResponse<{
+      status(code: number): { send(body: { statusCode: number; message: string }): void };
+    }>();
+    response.status(403).send({ statusCode: 403, message: 'Runtime termination approval denied' });
+  }
+}

apps/gateway/src/agent/runtime-provider-registry.service.ts

@@ -0,0 +1,500 @@
+import { ForbiddenException, Inject, Injectable, Logger, NotFoundException } from '@nestjs/common';
+import { AgentRuntimeProviderRegistry } from '@mosaicstack/agent';
+import {
+  createRuntimeAuditLogEntry,
+  type LogService,
+  type RuntimeAuditErrorCode,
+} from '@mosaicstack/log';
+import type {
+  AgentRuntimeProvider,
+  RuntimeAttachHandle,
+  RuntimeAttachMode,
+  RuntimeCapability,
+  RuntimeCapabilitySet,
+  RuntimeHealth,
+  RuntimeMessage,
+  RuntimeScope,
+  RuntimeSession,
+  RuntimeSessionTree,
+  RuntimeStreamEvent,
+  TransitionalCapabilityInventoryEntry,
+  TransitionalCapabilityInventoryProvider,
+} from '@mosaicstack/types';
+import type { ActorTenantScope } from '../auth/session-scope.js';
+import { LOG_SERVICE } from '../log/log.tokens.js';
+
+export const AGENT_RUNTIME_PROVIDER_REGISTRY = Symbol('AGENT_RUNTIME_PROVIDER_REGISTRY');
+export const RUNTIME_PROVIDER_AUDIT_SINK = Symbol('RUNTIME_PROVIDER_AUDIT_SINK');
+export const RUNTIME_APPROVAL_VERIFIER = Symbol('RUNTIME_APPROVAL_VERIFIER');
+
+export type RuntimeProviderOperation =
+  | RuntimeCapability
+  | 'runtime.capabilities'
+  | 'runtime.health'
+  | 'runtime.transitional-capabilities';
+export type RuntimeProviderAuditOutcome = 'requested' | 'succeeded' | 'denied' | 'failed';
+
+/** Trusted server-side context only; it intentionally excludes client-provided identity fields. */
+export interface RuntimeProviderRequestContext {
+  actorScope: ActorTenantScope;
+  channelId: string;
+  correlationId: string;
+}
+
+/** Metadata-only audit record. Message bodies, idempotency keys, and approval refs are excluded. */
+export interface RuntimeAuditEvent {
+  providerId: string;
+  operation: RuntimeProviderOperation;
+  outcome: RuntimeProviderAuditOutcome;
+  actorId: string;
+  tenantId: string;
+  channelId: string;
+  correlationId: string;
+  resourceId?: string;
+  durationMs?: number;
+  errorCode?: RuntimeAuditErrorCode;
+}
+
+export interface RuntimeAuditSink {
+  record(event: RuntimeAuditEvent): Promise<void>;
+}
+
+/** Exact action shape that a durable approval implementation must consume once. */
+export interface RuntimeTerminationAction {
+  providerId: string;
+  sessionId: string;
+  actorId: string;
+  tenantId: string;
+  channelId: string;
+  correlationId: string;
+  agentName: string;
+}
+
+export interface RuntimeApprovalVerifier {
+  consume(approvalRef: string, action: RuntimeTerminationAction): Promise<boolean>;
+}
+
+function isTransitionalInventoryProvider(
+  provider: AgentRuntimeProvider,
+): provider is AgentRuntimeProvider & TransitionalCapabilityInventoryProvider {
+  return (
+    typeof (provider as Partial<TransitionalCapabilityInventoryProvider>)
+      .transitionalCapabilityMatrix === 'function'
+  );
+}
+
+function configuredAgentName(): string {
+  const agentName = process.env['MOSAIC_AGENT_NAME']?.trim();
+  if (!agentName) throw new RuntimeApprovalDeniedError();
+  return agentName;
+}
+
+export class RuntimeApprovalDeniedError extends Error {
+  constructor() {
+    super('Runtime termination approval denied');
+  }
+}
+
+/**
+ * The default denies all runtime termination until a durable, exact-action
+ * approval implementation is configured. This is safer than a permissive stub.
+ */
+@Injectable()
+export class DenyRuntimeApprovalVerifier implements RuntimeApprovalVerifier {
+  async consume(_approvalRef: string, _action: RuntimeTerminationAction): Promise<boolean> {
+    return false;
+  }
+}
+
+/**
+ * Temporary metadata-only audit sink. M1 observability can replace this token
+ * with a durable audit writer without changing provider call sites.
+ */
+@Injectable()
+export class RuntimeProviderAuditService implements RuntimeAuditSink {
+  private readonly logger = new Logger(RuntimeProviderAuditService.name);
+
+  constructor(@Inject(LOG_SERVICE) private readonly logService: LogService) {}
+
+  async record(event: RuntimeAuditEvent): Promise<void> {
+    const entry = createRuntimeAuditLogEntry(event);
+    await this.logService.logs.ingest(entry);
+    this.logger.log(JSON.stringify({ event: entry.content, metadata: entry.metadata }));
+  }
+}
+
+@Injectable()
+export class RuntimeProviderService {
+  private readonly logger = new Logger(RuntimeProviderService.name);
+
+  constructor(
+    @Inject(AGENT_RUNTIME_PROVIDER_REGISTRY)
+    private readonly registry: AgentRuntimeProviderRegistry,
+    @Inject(RUNTIME_PROVIDER_AUDIT_SINK)
+    private readonly audit: RuntimeAuditSink,
+    @Inject(RUNTIME_APPROVAL_VERIFIER)
+    private readonly approvals: RuntimeApprovalVerifier,
+  ) {}
+
+  async capabilities(
+    providerId: string,
+    context: RuntimeProviderRequestContext,
+  ): Promise<RuntimeCapabilitySet> {
+    return this.execute(
+      providerId,
+      'runtime.capabilities',
+      undefined,
+      undefined,
+      context,
+      (provider: AgentRuntimeProvider, scope: RuntimeScope): Promise<RuntimeCapabilitySet> =>
+        provider.capabilities(scope),
+    );
+  }
+
+  async health(providerId: string, context: RuntimeProviderRequestContext): Promise<RuntimeHealth> {
+    return this.execute(
+      providerId,
+      'runtime.health',
+      undefined,
+      undefined,
+      context,
+      (provider: AgentRuntimeProvider, scope: RuntimeScope): Promise<RuntimeHealth> =>
+        provider.health(scope),
+    );
+  }
+
+  async transitionalCapabilityMatrix(
+    providerId: string,
+    context: RuntimeProviderRequestContext,
+  ): Promise<TransitionalCapabilityInventoryEntry[]> {
+    return this.execute(
+      providerId,
+      'runtime.transitional-capabilities',
+      undefined,
+      undefined,
+      context,
+      async (provider: AgentRuntimeProvider, scope: RuntimeScope) => {
+        if (!isTransitionalInventoryProvider(provider)) {
+          throw new NotFoundException('Runtime provider has no transitional capability inventory');
+        }
+        return provider.transitionalCapabilityMatrix(scope);
+      },
+    );
+  }
+
+  async listSessions(
+    providerId: string,
+    context: RuntimeProviderRequestContext,
+  ): Promise<RuntimeSession[]> {
+    return this.execute(
+      providerId,
+      'session.list',
+      'session.list',
+      undefined,
+      context,
+      (provider: AgentRuntimeProvider, scope: RuntimeScope): Promise<RuntimeSession[]> =>
+        provider.listSessions(scope),
+    );
+  }
+
+  async getSessionTree(
+    providerId: string,
+    context: RuntimeProviderRequestContext,
+  ): Promise<RuntimeSessionTree[]> {
+    return this.execute(
+      providerId,
+      'session.tree',
+      'session.tree',
+      undefined,
+      context,
+      (provider: AgentRuntimeProvider, scope: RuntimeScope): Promise<RuntimeSessionTree[]> =>
+        provider.getSessionTree(scope),
+    );
+  }
+
+  streamSession(
+    providerId: string,
+    sessionId: string,
+    cursor: string | undefined,
+    context: RuntimeProviderRequestContext,
+  ): AsyncIterable<RuntimeStreamEvent> {
+    return this.stream(
+      providerId,
+      'session.stream',
+      'session.stream',
+      sessionId,
+      context,
+      (provider: AgentRuntimeProvider, scope: RuntimeScope): AsyncIterable<RuntimeStreamEvent> =>
+        provider.streamSession(sessionId, cursor, scope),
+    );
+  }
+
+  async sendMessage(
+    providerId: string,
+    sessionId: string,
+    message: RuntimeMessage,
+    context: RuntimeProviderRequestContext,
+  ): Promise<void> {
+    await this.execute(
+      providerId,
+      'session.send',
+      'session.send',
+      sessionId,
+      context,
+      (provider: AgentRuntimeProvider, scope: RuntimeScope): Promise<void> =>
+        provider.sendMessage(sessionId, message, scope),
+    );
+  }
+
+  async attach(
+    providerId: string,
+    sessionId: string,
+    mode: RuntimeAttachMode,
+    context: RuntimeProviderRequestContext,
+  ): Promise<RuntimeAttachHandle> {
+    return this.execute(
+      providerId,
+      'session.attach',
+      'session.attach',
+      sessionId,
+      context,
+      (provider: AgentRuntimeProvider, scope: RuntimeScope): Promise<RuntimeAttachHandle> =>
+        provider.attach(sessionId, mode, scope),
+    );
+  }
+
+  async detach(
+    providerId: string,
+    attachmentId: string,
+    context: RuntimeProviderRequestContext,
+  ): Promise<void> {
+    await this.execute(
+      providerId,
+      'session.attach',
+      'session.attach',
+      attachmentId,
+      context,
+      (provider: AgentRuntimeProvider, scope: RuntimeScope): Promise<void> =>
+        provider.detach(attachmentId, scope),
+    );
+  }
+
+  async terminate(
+    providerId: string,
+    sessionId: string,
+    approvalRef: string,
+    context: RuntimeProviderRequestContext,
+  ): Promise<void> {
+    await this.execute(
+      providerId,
+      'session.terminate',
+      'session.terminate',
+      sessionId,
+      context,
+      async (provider: AgentRuntimeProvider, scope: RuntimeScope): Promise<void> => {
+        const approved = await this.approvals.consume(approvalRef, {
+          providerId,
+          sessionId,
+          actorId: scope.actorId,
+          tenantId: scope.tenantId,
+          channelId: scope.channelId,
+          correlationId: scope.correlationId,
+          agentName: configuredAgentName(),
+        });
+        if (!approved) {
+          throw new RuntimeApprovalDeniedError();
+        }
+        await provider.terminate(sessionId, approvalRef, scope);
+      },
+    );
+  }
+
+  private async execute<T>(
+    providerId: string,
+    operation: RuntimeProviderOperation,
+    requiredCapability: RuntimeCapability | undefined,
+    resourceId: string | undefined,
+    context: RuntimeProviderRequestContext,
+    invoke: (provider: AgentRuntimeProvider, scope: RuntimeScope) => Promise<T>,
+  ): Promise<T> {
+    const scope = this.deriveScope(context);
+    const startedAt = Date.now();
+    await this.record(providerId, operation, 'requested', scope, resourceId);
+    let invocationStarted = false;
+    try {
+      const provider = this.provider(providerId);
+      if (requiredCapability) {
+        await this.assertCapability(provider, requiredCapability, scope);
+      }
+      invocationStarted = true;
+      const result = await invoke(provider, scope);
+      await this.recordCompletion(providerId, operation, scope, resourceId, Date.now() - startedAt);
+      return result;
+    } catch (error: unknown) {
+      const durationMs = Date.now() - startedAt;
+      if (invocationStarted && !this.isAuthorizationDenied(error)) {
+        await this.recordFailure(providerId, operation, scope, resourceId, durationMs);
+      } else {
+        await this.record(
+          providerId,
+          operation,
+          'denied',
+          scope,
+          resourceId,
+          durationMs,
+          'policy_denied',
+        );
+      }
+      throw error;
+    }
+  }
+
+  private async *stream(
+    providerId: string,
+    operation: RuntimeProviderOperation,
+    requiredCapability: RuntimeCapability,
+    resourceId: string,
+    context: RuntimeProviderRequestContext,
+    invoke: (
+      provider: AgentRuntimeProvider,
+      scope: RuntimeScope,
+    ) => AsyncIterable<RuntimeStreamEvent>,
+  ): AsyncIterable<RuntimeStreamEvent> {
+    const scope = this.deriveScope(context);
+    const startedAt = Date.now();
+    await this.record(providerId, operation, 'requested', scope, resourceId);
+    let invocationStarted = false;
+    try {
+      const provider = this.provider(providerId);
+      await this.assertCapability(provider, requiredCapability, scope);
+      invocationStarted = true;
+      for await (const event of invoke(provider, scope)) {
+        yield event;
+      }
+      await this.recordCompletion(providerId, operation, scope, resourceId, Date.now() - startedAt);
+    } catch (error: unknown) {
+      const durationMs = Date.now() - startedAt;
+      if (invocationStarted) {
+        await this.recordFailure(providerId, operation, scope, resourceId, durationMs);
+      } else {
+        await this.record(
+          providerId,
+          operation,
+          'denied',
+          scope,
+          resourceId,
+          durationMs,
+          'policy_denied',
+        );
+      }
+      throw error;
+    }
+  }
+
+  private isAuthorizationDenied(error: unknown): boolean {
+    return (
+      error instanceof RuntimeApprovalDeniedError ||
+      error instanceof ForbiddenException ||
+      (typeof error === 'object' &&
+        error !== null &&
+        'code' in error &&
+        (error as { code?: unknown }).code === 'forbidden')
+    );
+  }
+
+  private provider(providerId: string): AgentRuntimeProvider {
+    try {
+      return this.registry.require(providerId);
+    } catch (error: unknown) {
+      const message = error instanceof Error ? error.message : 'Runtime provider is not registered';
+      throw new NotFoundException(message);
+    }
+  }
+
+  private async assertCapability(
+    provider: AgentRuntimeProvider,
+    requiredCapability: RuntimeCapability,
+    scope: RuntimeScope,
+  ): Promise<void> {
+    const capabilities = await provider.capabilities(scope);
+    if (!capabilities.supported.includes(requiredCapability)) {
+      throw new ForbiddenException(`Runtime provider capability denied: ${requiredCapability}`);
+    }
+  }
+
+  private deriveScope(context: RuntimeProviderRequestContext): RuntimeScope {
+    const actorId = context.actorScope.userId.trim();
+    const tenantId = context.actorScope.tenantId.trim();
+    const channelId = context.channelId.trim();
+    const correlationId = context.correlationId.trim();
+    if (!actorId || !tenantId || !channelId || !correlationId) {
+      throw new ForbiddenException(
+        'Authenticated runtime actor scope and correlation are required',
+      );
+    }
+    return Object.freeze({ actorId, tenantId, channelId, correlationId });
+  }
+
+  private async recordFailure(
+    providerId: string,
+    operation: RuntimeProviderOperation,
+    scope: RuntimeScope,
+    resourceId: string | undefined,
+    durationMs: number,
+  ): Promise<void> {
+    try {
+      await this.record(
+        providerId,
+        operation,
+        'failed',
+        scope,
+        resourceId,
+        durationMs,
+        'provider_error',
+      );
+    } catch {
+      this.logger.error(
+        `Runtime provider failure audit failed provider=${providerId} operation=${operation} correlation=${scope.correlationId}`,
+      );
+    }
+  }
+
+  private async recordCompletion(
+    providerId: string,
+    operation: RuntimeProviderOperation,
+    scope: RuntimeScope,
+    resourceId: string | undefined,
+    durationMs: number,
+  ): Promise<void> {
+    try {
+      await this.record(providerId, operation, 'succeeded', scope, resourceId, durationMs);
+    } catch {
+      this.logger.error(
+        `Runtime provider completion audit failed provider=${providerId} operation=${operation} correlation=${scope.correlationId}`,
+      );
+    }
+  }
+
+  private async record(
+    providerId: string,
+    operation: RuntimeProviderOperation,
+    outcome: RuntimeProviderAuditOutcome,
+    scope: RuntimeScope,
+    resourceId: string | undefined,
+    durationMs?: number,
+    errorCode?: RuntimeAuditErrorCode,
+  ): Promise<void> {
+    await this.audit.record({
+      providerId,
+      operation,
+      outcome,
+      actorId: scope.actorId,
+      tenantId: scope.tenantId,
+      channelId: scope.channelId,
+      correlationId: scope.correlationId,
+      ...(resourceId ? { resourceId } : {}),
+      ...(durationMs !== undefined ? { durationMs } : {}),
+      ...(errorCode ? { errorCode } : {}),
+    });
+  }
+}

apps/gateway/src/agent/sessions.controller.ts

@@ -10,6 +10,8 @@ import {
   UseGuards,
 } from '@nestjs/common';
 import { AuthGuard } from '../auth/auth.guard.js';
+import { CurrentUser } from '../auth/current-user.decorator.js';
+import { scopeFromUser, type AuthenticatedUserLike } from '../auth/session-scope.js';
 import { AgentService } from './agent.service.js';
 
 @Controller('api/sessions')
@@ -18,23 +20,24 @@ export class SessionsController {
   constructor(@Inject(AgentService) private readonly agentService: AgentService) {}
 
   @Get()
-  list() {
-    const sessions = this.agentService.listSessions();
+  list(@CurrentUser() user: AuthenticatedUserLike) {
+    const sessions = this.agentService.listSessions(scopeFromUser(user));
     return { sessions, total: sessions.length };
   }
 
   @Get(':id')
-  findOne(@Param('id') id: string) {
-    const info = this.agentService.getSessionInfo(id);
+  findOne(@Param('id') id: string, @CurrentUser() user: AuthenticatedUserLike) {
+    const info = this.agentService.getSessionInfo(id, scopeFromUser(user));
     if (!info) throw new NotFoundException('Session not found');
     return info;
   }
 
   @Delete(':id')
   @HttpCode(HttpStatus.NO_CONTENT)
-  async destroy(@Param('id') id: string) {
-    const info = this.agentService.getSessionInfo(id);
+  async destroy(@Param('id') id: string, @CurrentUser() user: AuthenticatedUserLike) {
+    const scope = scopeFromUser(user);
+    const info = this.agentService.getSessionInfo(id, scope);
     if (!info) throw new NotFoundException('Session not found');
-    await this.agentService.destroySession(id);
+    await this.agentService.destroySession(id, scope);
   }
 }

apps/gateway/src/agent/tools/memory-tools.test.ts

@@ -0,0 +1,41 @@
+import { describe, expect, it, vi } from 'vitest';
+import { createMemoryTools } from './memory-tools.js';
+
+describe('createMemoryTools operator retrieval binding', () => {
+  const memory = {
+    insights: { searchByEmbedding: vi.fn(), create: vi.fn() },
+    preferences: { findByUserAndCategory: vi.fn(), findByUser: vi.fn(), upsert: vi.fn() },
+  };
+  const scope = { tenantId: 'tenant-a', ownerId: 'owner-a', sessionId: 'session-a' };
+
+  it('uses the configured plugin with the server-derived scope for retrieval and capture', async () => {
+    const plugin = {
+      search: vi.fn(async () => []),
+      capture: vi.fn(async () => ({ id: 'insight-1' })),
+    };
+    const tools = createMemoryTools(memory as never, null, 'owner-a', {
+      plugin: plugin as never,
+      scope,
+    });
+
+    await tools
+      .find((tool) => tool.name === 'memory_search')!
+      .execute('call-1', { query: 'plans' }, undefined, undefined, {} as never);
+    await tools
+      .find((tool) => tool.name === 'memory_save_insight')!
+      .execute(
+        'call-2',
+        { content: 'secret', category: 'decision' },
+        undefined,
+        undefined,
+        {} as never,
+      );
+
+    expect(plugin.search).toHaveBeenCalledWith(scope, 'plans', 5);
+    expect(plugin.capture).toHaveBeenCalledWith(scope, {
+      content: 'secret',
+      source: 'agent',
+      category: 'decision',
+    });
+  });
+});

apps/gateway/src/agent/tools/memory-tools.ts

@@ -1,7 +1,11 @@
 import { Type } from '@sinclair/typebox';
 import type { ToolDefinition } from '@mariozechner/pi-coding-agent';
-import type { Memory } from '@mosaicstack/memory';
-import type { EmbeddingProvider } from '@mosaicstack/memory';
+import type {
+  EmbeddingProvider,
+  Memory,
+  OperatorMemoryPlugin,
+  OperatorMemoryScope,
+} from '@mosaicstack/memory';
 
 /**
  * Create memory tools bound to the session's authenticated userId.
@@ -13,8 +17,10 @@ import type { EmbeddingProvider } from '@mosaicstack/memory';
 export function createMemoryTools(
   memory: Memory,
   embeddingProvider: EmbeddingProvider | null,
-  /** Authenticated user ID from the session. All memory operations are scoped to this user. */
+  /** Authenticated user ID from the session. All preference operations are scoped to this user. */
   sessionUserId: string | undefined,
+  /** Optional configured retrieval plugin, bound to a server-derived session scope. */
+  operatorMemory?: { plugin: OperatorMemoryPlugin; scope: OperatorMemoryScope },
 ): ToolDefinition[] {
   /** Return an error result when no session user is bound. */
   function noUserError() {
@@ -46,6 +52,14 @@ export function createMemoryTools(
         limit?: number;
       };
 
+      if (operatorMemory) {
+        const results = await operatorMemory.plugin.search(operatorMemory.scope, query, limit ?? 5);
+        return {
+          content: [{ type: 'text' as const, text: JSON.stringify(results, null, 2) }],
+          details: undefined,
+        };
+      }
+
       if (!embeddingProvider) {
         return {
           content: [
@@ -158,6 +172,18 @@ export function createMemoryTools(
       };
       type Cat = 'decision' | 'learning' | 'preference' | 'fact' | 'pattern' | 'general';
 
+      if (operatorMemory) {
+        const insight = await operatorMemory.plugin.capture(operatorMemory.scope, {
+          content,
+          source: 'agent',
+          category: category ?? 'learning',
+        });
+        return {
+          content: [{ type: 'text' as const, text: JSON.stringify(insight, null, 2) }],
+          details: undefined,
+        };
+      }
+
       let embedding: number[] | null = null;
       if (embeddingProvider) {
         embedding = await embeddingProvider.embed(content);

apps/gateway/src/app.module.spec.ts

@@ -0,0 +1,624 @@
+import 'reflect-metadata';
+import { mkdtemp, mkdir, readFile, rm, writeFile } from 'node:fs/promises';
+import * as nodeOs from 'node:os';
+import { dirname, isAbsolute, join, relative, resolve } from 'node:path';
+import * as nodeUrl from 'node:url';
+import { MODULE_METADATA } from '@nestjs/common/constants.js';
+import { describe, expect, it, vi } from 'vitest';
+import type { MosaicConfig } from '@mosaicstack/config';
+
+interface ComposedModuleGraph {
+  imports: readonly unknown[];
+  federationModule: unknown;
+  bootLogLines: readonly string[];
+  mosaicConfig: MosaicConfig;
+  resolvedConfigPath: string;
+}
+
+type StorageTier = 'local' | 'standalone' | 'federated';
+
+interface ModuleGraphFixture {
+  tempRoot: string;
+  anchor: string;
+  homePath: string;
+  cwdPath: string;
+  monorepoRootEnvPath: string;
+  gatewayLocalEnvPath: string;
+  daemonEnvPath: string;
+  monorepoRootConfigPath: string;
+  gatewayLocalConfigPath: string;
+}
+
+interface ModuleGraphFixtureOptions {
+  rootEnvMode?: 'present' | 'absent';
+  rootTier?: StorageTier;
+  rootEnvContents?: string;
+  redactionMarker?: string;
+  gatewayLocalTier?: StorageTier;
+  gatewayLocalEnvContents?: string;
+  daemonEnvContents?: string;
+  inheritedTier?: StorageTier;
+  expectedProcessTier?: string;
+  setup?: (fixture: ModuleGraphFixture) => Promise<void>;
+}
+
+// Each case uses vi.resetModules() and re-imports the full gateway graph for distinct ambient FS/env; CI needs headroom, while this still guards genuine hangs.
+const MODULE_IMPORT_TIMEOUT_MS = 120_000;
+const MONOREPO_ROOT_DOTENV_LABEL = 'monorepo-root .env';
+const DAEMON_DOTENV_LABEL = 'daemon .env';
+
+function configJson(tier: StorageTier): string {
+  if (tier === 'local') {
+    return JSON.stringify({
+      tier,
+      storage: { type: 'pglite', dataDir: '.mosaic/storage-pglite' },
+      queue: { type: 'local', dataDir: '.mosaic/queue' },
+      memory: { type: 'keyword' },
+    });
+  }
+
+  return JSON.stringify({
+    tier,
+    storage: { type: 'postgres', url: 'postgresql://fixture.invalid/mosaic' },
+    queue: { type: 'bullmq' },
+    memory: { type: tier === 'federated' ? 'pgvector' : 'keyword' },
+  });
+}
+
+function snapshotProcessEnv(): Record<string, string | undefined> {
+  return { ...process.env };
+}
+
+function restoreProcessEnv(snapshot: Record<string, string | undefined>): void {
+  for (const key of Object.keys(process.env)) {
+    if (!(key in snapshot)) {
+      delete process.env[key];
+    }
+  }
+
+  for (const [key, value] of Object.entries(snapshot)) {
+    if (value === undefined) {
+      delete process.env[key];
+      continue;
+    }
+
+    process.env[key] = value;
+  }
+}
+
+function expectPathUnderTempRoot(path: string, tempRoot: string): void {
+  const relativePath = relative(tempRoot, path);
+  expect(relativePath === '' || (!relativePath.startsWith('..') && !isAbsolute(relativePath))).toBe(
+    true,
+  );
+}
+
+async function writeFixture(path: string, contents: string, tempRoot: string): Promise<void> {
+  expectPathUnderTempRoot(path, tempRoot);
+  await mkdir(dirname(path), { recursive: true });
+  await writeFile(path, contents, 'utf8');
+}
+
+interface ConfigModuleProvider {
+  provide: string;
+  useFactory: () => MosaicConfig;
+}
+
+function isConfigModuleProvider(value: unknown): value is ConfigModuleProvider {
+  if (typeof value !== 'object' || value === null) {
+    return false;
+  }
+
+  if (!('provide' in value) || typeof value.provide !== 'string') {
+    return false;
+  }
+
+  return 'useFactory' in value && typeof value.useFactory === 'function';
+}
+
+function singleBootLogLine(bootLogLines: readonly string[]): string {
+  expect(bootLogLines).toHaveLength(1);
+  const [bootLogLine] = bootLogLines;
+  if (bootLogLine === undefined) {
+    throw new Error('Expected a single boot log line');
+  }
+
+  return bootLogLine;
+}
+
+function expectBootLogLine(
+  bootLogLines: readonly string[],
+  tier: StorageTier,
+  source: string,
+): void {
+  const bootLogLine = singleBootLogLine(bootLogLines);
+
+  expect(bootLogLine).toContain(`storage tier=${tier}`);
+  expect(bootLogLine).toContain(`source=${source}`);
+}
+
+async function loadModuleGraphFromDotenv(
+  options: ModuleGraphFixtureOptions,
+): Promise<ComposedModuleGraph> {
+  const originalEnv = snapshotProcessEnv();
+  const tempRoot = await mkdtemp(join(nodeOs.tmpdir(), 'mosaic-gateway-module-'));
+  let consoleInfoSpy: ReturnType<typeof vi.spyOn> | undefined;
+  let cwdSpy: ReturnType<typeof vi.spyOn> | undefined;
+
+  try {
+    const anchor = join(tempRoot, 'anchored', 'apps', 'gateway', 'src');
+    const homePath = join(tempRoot, 'home');
+    const cwdPath = join(tempRoot, 'ambient', 'parent', 'cwd');
+    const fixture: ModuleGraphFixture = {
+      tempRoot,
+      anchor,
+      homePath,
+      cwdPath,
+      monorepoRootEnvPath: resolve(anchor, '../../..', '.env'),
+      gatewayLocalEnvPath: resolve(anchor, '..', '.env'),
+      daemonEnvPath: join(homePath, '.config', 'mosaic', 'gateway', '.env'),
+      monorepoRootConfigPath: resolve(anchor, '../../..', 'mosaic.config.json'),
+      gatewayLocalConfigPath: resolve(anchor, '..', 'mosaic.config.json'),
+    };
+    consoleInfoSpy = vi.spyOn(console, 'info').mockImplementation((): void => undefined);
+
+    for (const path of Object.values(fixture)) {
+      expectPathUnderTempRoot(path, tempRoot);
+    }
+
+    await mkdir(anchor, { recursive: true });
+    await mkdir(cwdPath, { recursive: true });
+
+    if ((options.rootEnvMode ?? 'present') === 'absent') {
+      if (
+        options.rootEnvContents !== undefined ||
+        options.rootTier !== undefined ||
+        options.redactionMarker !== undefined
+      ) {
+        throw new Error('Expected no root env fixture values when rootEnvMode is absent');
+      }
+    } else {
+      if (options.rootEnvContents === undefined && options.rootTier === undefined) {
+        throw new Error('Expected rootTier or rootEnvContents');
+      }
+
+      const rootFixture = options.rootEnvContents ?? `MOSAIC_STORAGE_TIER=${options.rootTier}\n`;
+      const rootFixtureWithMarker = options.redactionMarker
+        ? `${rootFixture}BETTER_AUTH_SECRET=${options.redactionMarker}\n`
+        : rootFixture;
+      await writeFixture(fixture.monorepoRootEnvPath, rootFixtureWithMarker, tempRoot);
+    }
+
+    if (options.daemonEnvContents !== undefined) {
+      await writeFixture(fixture.daemonEnvPath, options.daemonEnvContents, tempRoot);
+    }
+
+    if (options.gatewayLocalEnvContents !== undefined) {
+      await writeFixture(fixture.gatewayLocalEnvPath, options.gatewayLocalEnvContents, tempRoot);
+    } else if (options.gatewayLocalTier !== undefined) {
+      await writeFixture(
+        fixture.gatewayLocalEnvPath,
+        `MOSAIC_STORAGE_TIER=${options.gatewayLocalTier}\n`,
+        tempRoot,
+      );
+    }
+
+    process.env['HOME'] = homePath;
+    delete process.env['MOSAIC_STORAGE_TIER'];
+    delete process.env['DATABASE_URL'];
+    delete process.env['VALKEY_URL'];
+    delete process.env['MOSAIC_GATEWAY_HOME'];
+
+    await options.setup?.(fixture);
+
+    if (options.inheritedTier !== undefined) {
+      process.env['MOSAIC_STORAGE_TIER'] = options.inheritedTier;
+    }
+
+    vi.resetModules();
+    vi.doMock('node:os', () => ({ ...nodeOs, homedir: (): string => homePath }));
+    vi.doMock('node:url', () => ({
+      ...nodeUrl,
+      fileURLToPath: (url: string | URL): string => {
+        const actualPath = nodeUrl.fileURLToPath(url);
+        if (
+          actualPath.endsWith('/apps/gateway/src/env.ts') ||
+          actualPath.endsWith('/apps/gateway/src/env.js')
+        ) {
+          return join(anchor, 'env.ts');
+        }
+        return actualPath;
+      },
+    }));
+    cwdSpy = vi.spyOn(process, 'cwd').mockReturnValue(cwdPath);
+
+    if (options.inheritedTier === undefined) {
+      expect(process.env['MOSAIC_STORAGE_TIER']).toBeUndefined();
+    } else {
+      expect(process.env['MOSAIC_STORAGE_TIER']).toBe(options.inheritedTier);
+    }
+
+    const envModule = await import('./env.js');
+    expect(process.env['MOSAIC_STORAGE_TIER']).toBe(
+      options.expectedProcessTier ?? options.rootTier,
+    );
+
+    const { AppModule } = await import('./app.module.js');
+    const { FederationModule } = await import('./federation/federation.module.js');
+    const imports: unknown = Reflect.getMetadata(MODULE_METADATA.IMPORTS, AppModule);
+
+    if (!Array.isArray(imports)) {
+      throw new Error('AppModule imports metadata is not an array');
+    }
+
+    const { ConfigModule, MOSAIC_CONFIG } = await import('./config/config.module.js');
+    const providers: unknown = Reflect.getMetadata(MODULE_METADATA.PROVIDERS, ConfigModule);
+
+    if (!Array.isArray(providers)) {
+      throw new Error('ConfigModule providers metadata is not an array');
+    }
+
+    const configProvider = providers
+      .filter(isConfigModuleProvider)
+      .find((provider: ConfigModuleProvider): boolean => provider.provide === MOSAIC_CONFIG);
+
+    if (!configProvider) {
+      throw new Error('MOSAIC_CONFIG provider factory not found');
+    }
+
+    return {
+      imports,
+      federationModule: FederationModule,
+      bootLogLines: consoleInfoSpy.mock.calls.map((args: readonly unknown[]): string =>
+        args.map((value: unknown): string => String(value)).join(' '),
+      ),
+      mosaicConfig: configProvider.useFactory(),
+      resolvedConfigPath: envModule.resolveGatewayConfigPath(),
+    };
+  } finally {
+    cwdSpy?.mockRestore();
+    vi.doUnmock('node:url');
+    vi.doUnmock('node:os');
+    vi.resetModules();
+    consoleInfoSpy?.mockRestore();
+    restoreProcessEnv(originalEnv);
+    await rm(tempRoot, { recursive: true, force: true });
+  }
+}
+
+describe('AppModule federation gating', (): void => {
+  it('loads dotenv before tracing and AppModule evaluation', async (): Promise<void> => {
+    const mainSource = await readFile(new URL('./main.ts', import.meta.url), 'utf8');
+    const envImportIndex = mainSource.indexOf("import './env.js';");
+    const tracingImportIndex = mainSource.indexOf("import './tracing.js';");
+    const appModuleImportIndex = mainSource.indexOf("import { AppModule } from './app.module.js';");
+
+    expect(envImportIndex).toBeGreaterThan(-1);
+    expect(envImportIndex).toBeLessThan(tracingImportIndex);
+    expect(envImportIndex).toBeLessThan(appModuleImportIndex);
+  });
+
+  it(
+    'ignores ambient cwd/.env and cwd/../.env files',
+    async (): Promise<void> => {
+      const graph = await loadModuleGraphFromDotenv({
+        rootTier: 'local',
+        setup: async (fixture: ModuleGraphFixture): Promise<void> => {
+          await writeFixture(
+            join(fixture.cwdPath, '.env'),
+            'MOSAIC_STORAGE_TIER=federated\n',
+            fixture.tempRoot,
+          );
+          await writeFixture(
+            resolve(fixture.cwdPath, '..', '.env'),
+            'MOSAIC_STORAGE_TIER=federated\n',
+            fixture.tempRoot,
+          );
+        },
+      });
+
+      expect(graph.imports).not.toContain(graph.federationModule);
+      expectBootLogLine(graph.bootLogLines, 'local', MONOREPO_ROOT_DOTENV_LABEL);
+    },
+    MODULE_IMPORT_TIMEOUT_MS,
+  );
+
+  it(
+    'ignores an ambient cwd/mosaic.config.json federated config',
+    async (): Promise<void> => {
+      const graph = await loadModuleGraphFromDotenv({
+        rootTier: 'local',
+        setup: async (fixture: ModuleGraphFixture): Promise<void> => {
+          await writeFixture(
+            join(fixture.cwdPath, 'mosaic.config.json'),
+            configJson('federated'),
+            fixture.tempRoot,
+          );
+        },
+      });
+
+      expect(graph.imports).not.toContain(graph.federationModule);
+      expectBootLogLine(graph.bootLogLines, 'local', MONOREPO_ROOT_DOTENV_LABEL);
+    },
+    MODULE_IMPORT_TIMEOUT_MS,
+  );
+
+  it(
+    'ignores an ambient cwd/../../mosaic.config.json federated config',
+    async (): Promise<void> => {
+      const graph = await loadModuleGraphFromDotenv({
+        rootTier: 'local',
+        setup: async (fixture: ModuleGraphFixture): Promise<void> => {
+          await writeFixture(
+            resolve(fixture.cwdPath, '../..', 'mosaic.config.json'),
+            configJson('federated'),
+            fixture.tempRoot,
+          );
+        },
+      });
+
+      expect(graph.imports).not.toContain(graph.federationModule);
+      expectBootLogLine(graph.bootLogLines, 'local', MONOREPO_ROOT_DOTENV_LABEL);
+    },
+    MODULE_IMPORT_TIMEOUT_MS,
+  );
+
+  it(
+    'anchored gateway-local config wins monorepo-root config and registers FederationModule',
+    async (): Promise<void> => {
+      let gatewayLocalConfigPath = '';
+      const graph = await loadModuleGraphFromDotenv({
+        rootTier: 'local',
+        setup: async (fixture: ModuleGraphFixture): Promise<void> => {
+          gatewayLocalConfigPath = fixture.gatewayLocalConfigPath;
+          await writeFixture(
+            fixture.gatewayLocalConfigPath,
+            configJson('federated'),
+            fixture.tempRoot,
+          );
+          await writeFixture(fixture.monorepoRootConfigPath, configJson('local'), fixture.tempRoot);
+        },
+      });
+
+      expect(graph.resolvedConfigPath).toBe(gatewayLocalConfigPath);
+      expect(graph.mosaicConfig.tier).toBe('federated');
+      expect(graph.imports).toContain(graph.federationModule);
+      expectBootLogLine(graph.bootLogLines, 'federated', 'mosaic.config.json');
+    },
+    MODULE_IMPORT_TIMEOUT_MS,
+  );
+
+  it(
+    'resolves the daemon-installed GATEWAY_HOME/mosaic.config.json ahead of gateway-local and monorepo-root configs',
+    async (): Promise<void> => {
+      let daemonConfigPath = '';
+      const graph = await loadModuleGraphFromDotenv({
+        rootEnvMode: 'absent',
+        setup: async (fixture: ModuleGraphFixture): Promise<void> => {
+          const externalGatewayHome = join(fixture.tempRoot, 'external-gateway-home');
+          daemonConfigPath = join(externalGatewayHome, 'mosaic.config.json');
+          await writeFixture(daemonConfigPath, configJson('federated'), fixture.tempRoot);
+          await writeFixture(
+            fixture.gatewayLocalConfigPath,
+            configJson('standalone'),
+            fixture.tempRoot,
+          );
+          await writeFixture(fixture.monorepoRootConfigPath, configJson('local'), fixture.tempRoot);
+          process.env['MOSAIC_GATEWAY_HOME'] = externalGatewayHome;
+          process.env['DATABASE_URL'] = 'postgresql://fixture.invalid/mosaic';
+        },
+      });
+
+      expect(graph.resolvedConfigPath).toBe(daemonConfigPath);
+      expect(graph.mosaicConfig.tier).toBe('federated');
+      expect(graph.imports).toContain(graph.federationModule);
+      expectBootLogLine(graph.bootLogLines, 'federated', 'mosaic.config.json');
+    },
+    MODULE_IMPORT_TIMEOUT_MS,
+  );
+
+  it(
+    'logs mosaic.config.json when anchored config and env tiers are both federated',
+    async (): Promise<void> => {
+      const graph = await loadModuleGraphFromDotenv({
+        rootTier: 'federated',
+        setup: async (fixture: ModuleGraphFixture): Promise<void> => {
+          await writeFixture(
+            fixture.monorepoRootConfigPath,
+            configJson('federated'),
+            fixture.tempRoot,
+          );
+        },
+      });
+
+      expect(graph.imports).toContain(graph.federationModule);
+      expectBootLogLine(graph.bootLogLines, 'federated', 'mosaic.config.json');
+    },
+    MODULE_IMPORT_TIMEOUT_MS,
+  );
+
+  it(
+    'logs standalone from a monorepo-root .env DATABASE_URL fallback',
+    async (): Promise<void> => {
+      const graph = await loadModuleGraphFromDotenv({
+        rootEnvContents: 'DATABASE_URL=fixture-database-url\n',
+      });
+
+      expect(graph.imports).not.toContain(graph.federationModule);
+      expectBootLogLine(graph.bootLogLines, 'standalone', MONOREPO_ROOT_DOTENV_LABEL);
+    },
+    MODULE_IMPORT_TIMEOUT_MS,
+  );
+
+  it(
+    'attributes an invalid monorepo-root dotenv tier to the default',
+    async (): Promise<void> => {
+      const graph = await loadModuleGraphFromDotenv({
+        rootEnvContents: 'MOSAIC_STORAGE_TIER=invalid\n',
+        expectedProcessTier: 'invalid',
+      });
+
+      expect(graph.imports).not.toContain(graph.federationModule);
+      expectBootLogLine(graph.bootLogLines, 'local', 'default');
+    },
+    MODULE_IMPORT_TIMEOUT_MS,
+  );
+
+  it(
+    'attributes DATABASE_URL fallback to daemon .env ahead of inherited local tier',
+    async (): Promise<void> => {
+      const graph = await loadModuleGraphFromDotenv({
+        rootEnvMode: 'absent',
+        daemonEnvContents: 'DATABASE_URL=fixture-database-url\n',
+        inheritedTier: 'local',
+        expectedProcessTier: 'local',
+      });
+
+      expect(graph.imports).not.toContain(graph.federationModule);
+      expectBootLogLine(graph.bootLogLines, 'standalone', DAEMON_DOTENV_LABEL);
+    },
+    MODULE_IMPORT_TIMEOUT_MS,
+  );
+
+  it(
+    'daemon .env wins over monorepo-root and gateway-local tier values',
+    async (): Promise<void> => {
+      const graph = await loadModuleGraphFromDotenv({
+        rootTier: 'local',
+        gatewayLocalTier: 'federated',
+        daemonEnvContents: 'MOSAIC_STORAGE_TIER=standalone\n',
+        expectedProcessTier: 'standalone',
+      });
+
+      expect(graph.imports).not.toContain(graph.federationModule);
+      expectBootLogLine(graph.bootLogLines, 'standalone', DAEMON_DOTENV_LABEL);
+    },
+    MODULE_IMPORT_TIMEOUT_MS,
+  );
+
+  it(
+    'inherits process.env.MOSAIC_STORAGE_TIER over daemon, monorepo-root, and gateway-local dotenv values',
+    async (): Promise<void> => {
+      const graph = await loadModuleGraphFromDotenv({
+        rootTier: 'local',
+        gatewayLocalTier: 'federated',
+        daemonEnvContents: 'MOSAIC_STORAGE_TIER=federated\n',
+        inheritedTier: 'standalone',
+        expectedProcessTier: 'standalone',
+      });
+
+      expect(graph.imports).not.toContain(graph.federationModule);
+      expectBootLogLine(graph.bootLogLines, 'standalone', 'process environment');
+    },
+    MODULE_IMPORT_TIMEOUT_MS,
+  );
+
+  it(
+    'gateway-local .env configures the tier and source when the monorepo-root .env is absent',
+    async (): Promise<void> => {
+      const graph = await loadModuleGraphFromDotenv({
+        rootEnvMode: 'absent',
+        gatewayLocalTier: 'federated',
+        expectedProcessTier: 'federated',
+      });
+
+      expect(graph.imports).toContain(graph.federationModule);
+      expectBootLogLine(graph.bootLogLines, 'federated', 'gateway-local .env');
+    },
+    MODULE_IMPORT_TIMEOUT_MS,
+  );
+
+  it(
+    'monorepo-root .env wins over gateway-local tier values',
+    async (): Promise<void> => {
+      const graph = await loadModuleGraphFromDotenv({
+        rootTier: 'standalone',
+        gatewayLocalTier: 'federated',
+      });
+
+      expect(graph.imports).not.toContain(graph.federationModule);
+      expectBootLogLine(graph.bootLogLines, 'standalone', MONOREPO_ROOT_DOTENV_LABEL);
+    },
+    MODULE_IMPORT_TIMEOUT_MS,
+  );
+
+  it.each(['local', 'standalone'] as const)(
+    'does not register FederationModule for the %s tier',
+    async (tier): Promise<void> => {
+      const graph = await loadModuleGraphFromDotenv({ rootTier: tier });
+
+      expect(graph.imports).not.toContain(graph.federationModule);
+      expectBootLogLine(graph.bootLogLines, tier, MONOREPO_ROOT_DOTENV_LABEL);
+    },
+    MODULE_IMPORT_TIMEOUT_MS,
+  );
+
+  it(
+    'registers FederationModule when federated tier is supplied by the anchored monorepo root .env',
+    async (): Promise<void> => {
+      const redactionMarker = 'redaction-fixture-marker';
+      const graph = await loadModuleGraphFromDotenv({
+        rootTier: 'federated',
+        redactionMarker,
+      });
+
+      expect(graph.imports).toContain(graph.federationModule);
+      expectBootLogLine(graph.bootLogLines, 'federated', MONOREPO_ROOT_DOTENV_LABEL);
+      expect(singleBootLogLine(graph.bootLogLines)).not.toContain(redactionMarker);
+    },
+    MODULE_IMPORT_TIMEOUT_MS,
+  );
+
+  it(
+    'MOSAIC_CONFIG provider ignores an ambient cwd/mosaic.config.json config',
+    async (): Promise<void> => {
+      const graph = await loadModuleGraphFromDotenv({
+        rootTier: 'local',
+        setup: async (fixture: ModuleGraphFixture): Promise<void> => {
+          await writeFixture(
+            join(fixture.cwdPath, 'mosaic.config.json'),
+            JSON.stringify({
+              tier: 'federated',
+              storage: {
+                type: 'postgres',
+                url: 'postgresql://ambient-attacker.invalid/mosaic',
+                enableVector: true,
+              },
+              queue: { type: 'bullmq' },
+              memory: { type: 'pgvector' },
+            }),
+            fixture.tempRoot,
+          );
+        },
+      });
+
+      expect(graph.mosaicConfig.tier).toBe('local');
+      expect(graph.mosaicConfig.storage).not.toEqual(
+        expect.objectContaining({ url: 'postgresql://ambient-attacker.invalid/mosaic' }),
+      );
+    },
+    MODULE_IMPORT_TIMEOUT_MS,
+  );
+
+  it(
+    'MOSAIC_CONFIG provider resolves from the anchored monorepo-root mosaic.config.json',
+    async (): Promise<void> => {
+      const graph = await loadModuleGraphFromDotenv({
+        rootTier: 'local',
+        setup: async (fixture: ModuleGraphFixture): Promise<void> => {
+          await writeFixture(
+            fixture.monorepoRootConfigPath,
+            configJson('federated'),
+            fixture.tempRoot,
+          );
+        },
+      });
+
+      expect(graph.mosaicConfig.tier).toBe('federated');
+      expect(graph.mosaicConfig.storage).toEqual(
+        expect.objectContaining({ url: 'postgresql://fixture.invalid/mosaic' }),
+      );
+    },
+    MODULE_IMPORT_TIMEOUT_MS,
+  );
+});

apps/gateway/src/app.module.ts

@@ -21,10 +21,22 @@ import { AdminModule } from './admin/admin.module.js';
 import { CommandsModule } from './commands/commands.module.js';
 import { PreferencesModule } from './preferences/preferences.module.js';
 import { GCModule } from './gc/gc.module.js';
+import { HarnessModule } from './harness/harness.module.js';
 import { ReloadModule } from './reload/reload.module.js';
 import { WorkspaceModule } from './workspace/workspace.module.js';
 import { QueueModule } from './queue/queue.module.js';
+import { FederationModule } from './federation/federation.module.js';
 import { ThrottlerGuard, ThrottlerModule } from '@nestjs/throttler';
+import { loadConfig } from '@mosaicstack/config';
+import { resolveGatewayConfigPath } from './env.js';
+
+// Federation (step-ca client, enrollment, federation verbs) is only wired for
+// tier 'federated' — CaService hard-requires STEP_CA_* at construction, which
+// must not gate standalone/local boots (docker-compose.federated.yml: the
+// federation profile "must not start in non-federated dev"). The gateway
+// entrypoint loads env.ts before evaluating this module so dotenv-backed tier
+// configuration is visible here.
+const federationEnabled = loadConfig(resolveGatewayConfigPath()).tier === 'federated';
 
 @Module({
   imports: [
@@ -49,9 +61,11 @@ import { ThrottlerGuard, ThrottlerModule } from '@nestjs/throttler';
     PreferencesModule,
     CommandsModule,
     GCModule,
+    HarnessModule,
     QueueModule,
     ReloadModule,
     WorkspaceModule,
+    ...(federationEnabled ? [FederationModule] : []),
   ],
   controllers: [HealthController],
   providers: [

apps/gateway/src/auth/session-scope.ts

@@ -0,0 +1,24 @@
+export interface AuthenticatedUserLike {
+  id: string;
+  tenantId?: string | null;
+  teamId?: string | null;
+  organizationId?: string | null;
+  orgId?: string | null;
+}
+
+export interface ActorTenantScope {
+  userId: string;
+  tenantId: string;
+}
+
+/**
+ * Build the immutable server-derived scope used for Tess session operations.
+ * Current Mosaic auth is user-scoped; future org/team claims can populate one
+ * of the tenant fields without allowing clients to choose another tenant.
+ */
+export function scopeFromUser(user: AuthenticatedUserLike): ActorTenantScope {
+  return {
+    userId: user.id,
+    tenantId: user.tenantId ?? user.teamId ?? user.organizationId ?? user.orgId ?? user.id,
+  };
+}

apps/gateway/src/chat/__tests__/chat-security.test.ts

@@ -1,10 +1,24 @@
 import 'reflect-metadata';
 import { readFileSync } from 'node:fs';
 import { resolve } from 'node:path';
-import { validateSync } from 'class-validator';
-import { describe, expect, it, vi } from 'vitest';
+import { ValidationPipe, type ArgumentMetadata } from '@nestjs/common';
+import { Test } from '@nestjs/testing';
+import { validateSync, type ValidationError } from 'class-validator';
+import { beforeEach, afterEach, describe, expect, it, vi } from 'vitest';
+import type { HarnessAdapter, HarnessConversationService } from '@mosaicstack/types';
+import { AgentService } from '../../agent/agent.service.js';
+import { AuthGuard } from '../../auth/auth.guard.js';
+import { HarnessRegistry } from '../../harness/harness.registry.js';
+import { HARNESS_REGISTRY } from '../../harness/harness.tokens.js';
+import type { AuthenticatedUserLike } from '../../auth/session-scope.js';
 import { SendMessageDto } from '../../conversations/conversations.dto.js';
-import { ChatRequestDto } from '../chat.dto.js';
+import { ChatController } from '../chat.controller.js';
+import { ChatGateway } from '../chat.gateway.js';
+import { ChatRuntimeRouter } from '../chat-runtime-router.js';
+import { EmbeddedChatRuntime } from '../embedded-chat.runtime.js';
+import { HarnessChatRuntime } from '../harness-chat.runtime.js';
+import type { ChatRuntime } from '../chat-runtime.js';
+import { ChatRequestDto, HarnessTurnSendDto } from '../chat.dto.js';
 import { validateSocketSession } from '../chat.gateway-auth.js';
 
 describe('Chat controller source hardening', () => {
@@ -12,7 +26,330 @@ describe('Chat controller source hardening', () => {
     const source = readFileSync(resolve('src/chat/chat.controller.ts'), 'utf8');
 
     expect(source).toContain('@UseGuards(AuthGuard)');
-    expect(source).toContain('@CurrentUser() user: { id: string }');
+    expect(source).toContain('@CurrentUser() user: AuthenticatedUserLike');
+    expect(source).toContain('const scope = scopeFromUser(user);');
+  });
+});
+
+describe('Chat runtime routing hardening (Task Five)', () => {
+  it('routes /api/chat through the exclusive ChatRuntimeRouter, never the embedded AgentService', () => {
+    const source = readFileSync(resolve('src/chat/chat.controller.ts'), 'utf8');
+
+    // pi-rpc /api/chat must resolve execution through the one runtime router and never
+    // reach into embedded agent execution. Legacy embedded behaviour lives behind
+    // EmbeddedChatRuntime, reachable only via the router in legacy mode.
+    expect(source).toContain('ChatRuntimeRouter');
+    expect(source).not.toContain('@Inject(AgentService)');
+    expect(source).not.toContain("from '../agent/agent.service.js'");
+  });
+
+  it('gateway no longer injects the embedded AgentService or RoutingEngineService', () => {
+    const source = readFileSync(resolve('src/chat/chat.gateway.ts'), 'utf8');
+
+    expect(source).toContain('ChatRuntimeRouter');
+    expect(source).not.toContain('@Inject(AgentService)');
+    expect(source).not.toContain('@Inject(RoutingEngineService)');
+  });
+});
+
+describe('Harness turn:send DTO validation (Task Five, group 2 — frozen wire contract, production pipe)', () => {
+  // Correction #2 (Scrappy fe3e02): drive PLAIN wire payloads through the EXACT production
+  // validation the gateway applies to inbound bodies — the global ValidationPipe in
+  // apps/gateway/src/main.ts: { whitelist, forbidNonWhitelisted, transform }. This exercises
+  // the real plainToInstance transform, nested @Type/@ValidateNested recursion, and whitelist
+  // stripping — the path a turn:send actually travels — rather than a hand-built class instance
+  // fed to validateSync (which never runs @Type and is masked green by class-validator's
+  // empty-metadata unknownValue behaviour). Anti-masking: every VALUE-rule red asserts the field
+  // carries a REAL value constraint (not `whitelistValidation`/`unknownValue`), which the
+  // decorator-less stub can NEVER produce; every authority-field red asserts the forbidden field
+  // is rejected while a valid field is NOT — false against the stub, which over-rejects everything.
+  const PRODUCTION_PIPE = () =>
+    new ValidationPipe({ whitelist: true, forbidNonWhitelisted: true, transform: true });
+  // Same production configuration, but hand back the raw ValidationError[] instead of throwing a
+  // BadRequestException, so the test can inspect per-field constraint keys and nested children.
+  const failPipe = new ValidationPipe({
+    whitelist: true,
+    forbidNonWhitelisted: true,
+    transform: true,
+    exceptionFactory: (errs: ValidationError[]) => errs as unknown as Error,
+  });
+  const asBody = (metatype: ArgumentMetadata['metatype']): ArgumentMetadata => ({
+    type: 'body',
+    metatype,
+    data: '',
+  });
+
+  const UUID_V4 = '11111111-1111-4111-8111-111111111111';
+  const validSelection = () => ({ harnessId: 'pi', providerId: 'anthropic', modelId: 'claude' });
+  const validPayload = () => ({
+    conversationId: UUID_V4,
+    content: 'hello there',
+    selection: validSelection(),
+    idempotencyKey: UUID_V4,
+  });
+
+  // Constraint keys that mean "the field was rejected for existing", NOT "its VALUE failed a real
+  // rule". The decorator-less RED stub can only ever emit these (or nothing), so requiring a REAL
+  // value constraint on a field is unmaskable until Step Three attaches the decorators.
+  const NON_VALUE = new Set(['whitelistValidation', 'unknownValue']);
+
+  // Flatten the error tree to `dotted.path -> Set<constraintKey>` (parent + nested children).
+  const collect = (errors: ValidationError[], prefix = ''): Map<string, Set<string>> => {
+    const map = new Map<string, Set<string>>();
+    const add = (path: string, keys: Iterable<string>): void => {
+      const set = map.get(path) ?? new Set<string>();
+      for (const key of keys) set.add(key);
+      map.set(path, set);
+    };
+    for (const error of errors) {
+      const path = prefix ? `${prefix}.${error.property}` : error.property;
+      if (error.constraints) add(path, Object.keys(error.constraints));
+      if (error.children?.length) for (const [p, s] of collect(error.children, path)) add(p, s);
+    }
+    return map;
+  };
+
+  // Run the production pipe over a plain payload; return the ValidationError[] it raised (empty
+  // when the payload is accepted).
+  const errorsFor = async (
+    payload: unknown,
+    metatype: ArgumentMetadata['metatype'] = HarnessTurnSendDto,
+  ): Promise<ValidationError[]> => {
+    try {
+      await failPipe.transform(payload, asBody(metatype));
+      return [];
+    } catch (thrown) {
+      return thrown as ValidationError[];
+    }
+  };
+
+  // True when `path` is rejected by a REAL value rule (IsUUID, IsNotEmpty, MaxLength, …), i.e. a
+  // constraint that is not a mere existence/whitelist rejection.
+  const hasValueConstraint = async (
+    payload: unknown,
+    path: string,
+    metatype: ArgumentMetadata['metatype'] = HarnessTurnSendDto,
+  ): Promise<boolean> => {
+    const keys = collect(await errorsFor(payload, metatype)).get(path);
+    return keys ? [...keys].some((key) => !NON_VALUE.has(key)) : false;
+  };
+
+  // Paths rejected purely for existing outside the whitelist (authority / unknown-field defence).
+  const forbiddenFields = async (payload: unknown): Promise<string[]> => {
+    const out: string[] = [];
+    for (const [path, keys] of collect(await errorsFor(payload))) {
+      if (keys.has('whitelistValidation')) out.push(path);
+    }
+    return out;
+  };
+
+  // --- GREEN controls: prove the production pipe machinery genuinely accepts a well-formed,
+  //     already-decorated DTO AND enforces its constraints — so the group's reds below are the
+  //     STUB's missing decorators, not a broken harness. Both pass today. ---
+  it('GREEN control: the production pipe accepts a well-formed, decorated ChatRequestDto', async () => {
+    await expect(
+      PRODUCTION_PIPE().transform({ content: 'hello there' }, asBody(ChatRequestDto)),
+    ).resolves.toBeTruthy();
+  });
+
+  it('GREEN control: the same production pipe rejects over-long ChatRequestDto content (engine truly enforces)', async () => {
+    expect(
+      await hasValueConstraint({ content: 'x'.repeat(10_001) }, 'content', ChatRequestDto),
+    ).toBe(true);
+  });
+
+  // --- RED value-rule fence: each asserts the turn:send field is rejected by a REAL value rule.
+  //     All fail against the decorator-less stub; they go green when Step Three adds the decorators.
+  //     No validation implementation is permitted during RED collection. ---
+  it('requires a conversation id (rejects a missing conversationId)', async () => {
+    expect(
+      await hasValueConstraint({ ...validPayload(), conversationId: undefined }, 'conversationId'),
+    ).toBe(true);
+  });
+
+  it('requires a UUID conversation id (rejects a non-UUID conversationId)', async () => {
+    expect(
+      await hasValueConstraint(
+        { ...validPayload(), conversationId: 'not-a-uuid' },
+        'conversationId',
+      ),
+    ).toBe(true);
+  });
+
+  it('rejects empty / whitespace-only content (content is trimmed 1..10000)', async () => {
+    expect(await hasValueConstraint({ ...validPayload(), content: '   ' }, 'content')).toBe(true);
+  });
+
+  it('rejects content above 10000 characters', async () => {
+    expect(
+      await hasValueConstraint({ ...validPayload(), content: 'x'.repeat(10_001) }, 'content'),
+    ).toBe(true);
+  });
+
+  it('requires the nested selection triple (rejects a missing selection)', async () => {
+    expect(await hasValueConstraint({ ...validPayload(), selection: undefined }, 'selection')).toBe(
+      true,
+    );
+  });
+
+  it('rejects malformed selection nesting (a non-object selection)', async () => {
+    expect(
+      await hasValueConstraint(
+        { ...validPayload(), selection: 'pi/anthropic/claude' },
+        'selection',
+      ),
+    ).toBe(true);
+  });
+
+  it('rejects a selection with a blank harnessId (each id must be non-empty)', async () => {
+    const payload = {
+      ...validPayload(),
+      selection: { harnessId: '', providerId: 'anthropic', modelId: 'claude' },
+    };
+    expect(await hasValueConstraint(payload, 'selection.harnessId')).toBe(true);
+  });
+
+  it('rejects a selection missing the modelId', async () => {
+    const payload = { ...validPayload(), selection: { harnessId: 'pi', providerId: 'anthropic' } };
+    expect(await hasValueConstraint(payload, 'selection.modelId')).toBe(true);
+  });
+
+  it('requires a UUID-v4 idempotency key (rejects a missing key)', async () => {
+    expect(
+      await hasValueConstraint({ ...validPayload(), idempotencyKey: undefined }, 'idempotencyKey'),
+    ).toBe(true);
+  });
+
+  it('rejects a non-UUID-v4 idempotency key', async () => {
+    expect(
+      await hasValueConstraint(
+        { ...validPayload(), idempotencyKey: 'not-a-key' },
+        'idempotencyKey',
+      ),
+    ).toBe(true);
+  });
+
+  // --- RED authority/unknown-field fence: the forbidden field is rejected while a valid field is
+  //     NOT spuriously rejected. False against the stub (which over-rejects every field, including
+  //     `content`); true only once Step Three whitelists the legitimate fields. ---
+  it('rejects a top-level authority field (provider) without flagging valid fields', async () => {
+    const forbidden = await forbiddenFields({ ...validPayload(), provider: 'openai' });
+    expect(forbidden).toContain('provider');
+    expect(forbidden).not.toContain('content');
+  });
+
+  it('rejects a top-level modelId authority field without flagging valid fields', async () => {
+    const forbidden = await forbiddenFields({ ...validPayload(), modelId: 'gpt-5' });
+    expect(forbidden).toContain('modelId');
+    expect(forbidden).not.toContain('content');
+  });
+
+  it('rejects an attachments field (not part of the frozen turn:send contract)', async () => {
+    const forbidden = await forbiddenFields({ ...validPayload(), attachments: [{ id: 'a1' }] });
+    expect(forbidden).toContain('attachments');
+    expect(forbidden).not.toContain('content');
+  });
+});
+
+describe('Chat runtime routing — behavioural /api/chat fence (Task Five, group 3)', () => {
+  // The router's own runtime tokens. The controller must reach chat execution ONLY through the
+  // router; the embedded AgentService below is the forbidden path proven untouched.
+  const embedded: ChatRuntime = { kind: 'embedded' };
+  const harness: ChatRuntime = { kind: 'harness' };
+
+  // Structurally-complete, non-sentinel conversation service; its methods are never invoked here.
+  const boundConversationService = {
+    attach: () => Promise.reject(new Error('unused')),
+    detach: () => Promise.reject(new Error('unused')),
+    send: () => Promise.reject(new Error('unused')),
+
+    subscribeFrom: async function* () {
+      throw new Error('unused');
+    },
+  } as unknown as HarnessConversationService;
+
+  it('handles an /api/chat turn without invoking the embedded AgentService (behavioural, zero calls)', async () => {
+    const calls = { getSession: 0, createSession: 0, onEvent: 0, prompt: 0 };
+    // A spy standing in for the forbidden embedded runtime. `createSession` rejects so today's
+    // controller bails immediately (never reaching the 120s agent-response wait) while still
+    // recording that it reached into the embedded path — the RED anchor. Under Step Three the
+    // router owns execution and this spy is never touched, so every counter stays 0 (GREEN).
+    // Any masking mutation that re-enters embedded execution flips a counter and re-reds the test.
+    const agentSpy = {
+      getSession: () => {
+        calls.getSession += 1;
+        return undefined;
+      },
+      createSession: () => {
+        calls.createSession += 1;
+        return Promise.reject(new Error('spy: embedded AgentService must not be used'));
+      },
+      onEvent: () => {
+        calls.onEvent += 1;
+        return () => {};
+      },
+      prompt: () => {
+        calls.prompt += 1;
+        return Promise.resolve();
+      },
+    };
+
+    const moduleRef = await Test.createTestingModule({
+      controllers: [ChatController],
+      providers: [
+        { provide: AgentService, useValue: agentSpy },
+        {
+          // Provided so the Step-Three controller (which injects the router) still resolves here;
+          // the real, empty registry seeded with a pi adapter keeps the router pi-rpc-ready.
+          provide: HARNESS_REGISTRY,
+          useFactory: () => {
+            const registry = new HarnessRegistry();
+            registry.register({
+              id: 'pi',
+              describe: () => Promise.reject(new Error('unused')),
+              catalog: () => Promise.reject(new Error('unused')),
+              create: () => Promise.reject(new Error('unused')),
+              resume: () => Promise.reject(new Error('unused')),
+            } as HarnessAdapter);
+            return registry;
+          },
+        },
+        {
+          provide: ChatRuntimeRouter,
+          useFactory: (registry: HarnessRegistry) =>
+            new ChatRuntimeRouter(registry, boundConversationService, embedded, harness, 'pi-rpc'),
+          inject: [HARNESS_REGISTRY],
+        },
+      ],
+    })
+      // ChatController's @UseGuards(AuthGuard) is resolved during instance loading; AuthGuard
+      // injects AUTH, an HTTP-only concern never exercised by a direct handler call. Stub it so
+      // the graph resolves and the test reds on BEHAVIOUR, not on a DI collection error.
+      .overrideGuard(AuthGuard)
+      .useValue({ canActivate: () => true })
+      .compile();
+
+    try {
+      const controller = moduleRef.get(ChatController, { strict: false });
+      const user = { id: 'user-1' } as AuthenticatedUserLike;
+      try {
+        await controller.chat({ content: 'route me' } as ChatRequestDto, user);
+      } catch {
+        // Today: SERVICE_UNAVAILABLE from the rejecting spy. Under Step Three: the router path may
+        // reject on the deliberately-unbound fake conversation service. Either way the
+        // embedded-call counters below are the contract, not the handler's return value.
+      }
+      expect(calls).toEqual({ getSession: 0, createSession: 0, onEvent: 0, prompt: 0 });
+    } finally {
+      await moduleRef.close();
+    }
+  });
+
+  it('wires the exclusive ChatRuntimeRouter into the chat module graph (defense-in-depth source check)', () => {
+    const source = readFileSync(resolve('src/chat/chat.module.ts'), 'utf8');
+    // The controller can only inject the router if the module actually provides it. RED today:
+    // ChatModule provides only ChatGateway. GREEN once Step Three registers ChatRuntimeRouter.
+    expect(source).toContain('ChatRuntimeRouter');
   });
 });
 
@@ -46,6 +383,419 @@ describe('WebSocket session authentication', () => {
   });
 });
 
+describe('Non-Discord ("Telegram-equivalent") socket ingress rejection (Task Five, both runtime modes)', () => {
+  // Scrappy C adjudication regression: a non-Discord service socket — modelled as a "Telegram"
+  // client presenting a handshake token the gateway does NOT honour and carrying no Better-Auth
+  // session — must be DISCONNECTED at handleConnection, never gain the `discordService` trust flag
+  // or any user scope, receive no manifest and no ack, and reach NEITHER the embedded runtime NOR
+  // the harness. This must hold in BOTH legacy and pi-rpc modes: introducing the exclusive
+  // ChatRuntimeRouter / pi-rpc path must not open a second, non-Discord service ingress. This is a
+  // GREEN control (it holds on this branch and must keep holding through Step Three); no Telegram
+  // production route or plugin exists or is added — the assertion is that no such surface is
+  // reachable. The runtime slot is fronted with a REAL, ready ChatRuntimeRouter over
+  // EmbeddedChatRuntime + HarnessChatRuntime so that any accidental dispatch would flip a spy
+  // rather than silently pass; the router is never resolved because the socket is rejected first.
+  let priorMode: string | undefined;
+  beforeEach(() => {
+    priorMode = process.env['CHAT_HARNESS_RUNTIME'];
+  });
+  afterEach(() => {
+    if (priorMode === undefined) delete process.env['CHAT_HARNESS_RUNTIME'];
+    else process.env['CHAT_HARNESS_RUNTIME'] = priorMode;
+  });
+
+  // A pi-ready registry so a pi-rpc router resolves the harness cleanly at onModuleInit — modelling
+  // the hostile condition where the harness is live yet the non-Discord socket is still rejected.
+  const readyPiRegistry = (): HarnessRegistry => {
+    const registry = new HarnessRegistry();
+    registry.register({
+      id: 'pi',
+      describe: () => Promise.reject(new Error('unused')),
+      catalog: () => Promise.reject(new Error('unused')),
+      create: () => Promise.reject(new Error('unused')),
+      resume: () => Promise.reject(new Error('unused')),
+    } as HarnessAdapter);
+    return registry;
+  };
+
+  // Non-sentinel conversation service so pi-rpc onModuleInit resolves the harness (does not throw
+  // conversation_service_unavailable); its methods must never be invoked on the rejection path.
+  const availableConversationService = {
+    attach: () => Promise.reject(new Error('unused')),
+    detach: () => Promise.reject(new Error('unused')),
+    send: () => Promise.reject(new Error('unused')),
+
+    subscribeFrom: async function* () {
+      throw new Error('unused');
+    },
+  } as unknown as HarnessConversationService;
+
+  const readyRouter = (
+    mode: 'legacy' | 'pi-rpc',
+    agentService: unknown,
+    harnessConversations: unknown,
+  ): ChatRuntimeRouter => {
+    const embedded = new EmbeddedChatRuntime(agentService as never);
+    const harness = new HarnessChatRuntime(harnessConversations as never);
+    const router = new ChatRuntimeRouter(
+      readyPiRegistry(),
+      availableConversationService,
+      embedded,
+      harness,
+      mode,
+    );
+    router.onModuleInit();
+    return router;
+  };
+
+  it.each(['legacy', 'pi-rpc'] as const)(
+    'disconnects a Telegram-shaped unauthenticated socket and dispatches to no runtime (%s mode)',
+    async (mode) => {
+      process.env['CHAT_HARNESS_RUNTIME'] = mode;
+      const agentService = {
+        getSession: vi.fn().mockReturnValue(undefined),
+        createSession: vi.fn(),
+        recordMessage: vi.fn(),
+        onEvent: vi.fn().mockReturnValue((): void => undefined),
+        addChannel: vi.fn(),
+        prompt: vi.fn().mockResolvedValue(undefined),
+      };
+      const harnessConversations = { append: vi.fn() };
+      // Auth stub that resolves NO session for the Telegram socket's headers — the sole gate a
+      // non-Discord client must pass, and does not.
+      const auth = { api: { getSession: vi.fn().mockResolvedValue(null) } };
+      const gateway = new ChatGateway(
+        readyRouter(mode, agentService, harnessConversations) as never,
+        auth as never,
+        { conversations: { addMessage: vi.fn().mockResolvedValue(undefined) } } as never,
+        {} as never,
+        {} as never,
+        {} as never,
+      );
+
+      const client = {
+        id: `telegram-raw-${mode}`,
+        // A non-Discord service handshake: the gateway only honours `discordServiceToken`, so this
+        // token is ignored, and there is no session cookie for validateSocketSession to resolve.
+        handshake: { auth: { telegramServiceToken: 'ignored-non-discord-token' }, headers: {} },
+        data: {} as Record<string, unknown>,
+        emit: vi.fn(),
+        disconnect: vi.fn(),
+      };
+
+      await gateway.handleConnection(client as never);
+
+      // Rejected at the door: disconnected, no trust flag, no user scope, no manifest, and — the
+      // Task 5 send-capability rule — no send-protocol advertisement to an unauthenticated socket.
+      expect(client.disconnect).toHaveBeenCalled();
+      expect(client.data.discordService).not.toBe(true);
+      expect(client.data.user).toBeUndefined();
+      expect(client.emit).not.toHaveBeenCalledWith('commands:manifest', expect.anything());
+      expect(client.emit).not.toHaveBeenCalledWith('chat:send-capability', expect.anything());
+
+      // Even if the ignored socket then attempts a message, it carries no scope, so the send path
+      // never begins and no runtime is dispatched.
+      await gateway.handleMessage(
+        client as never,
+        {
+          conversationId: 'Nova:telegram:chat-1',
+          content: 'via telegram',
+        } as never,
+      );
+
+      expect(client.emit).not.toHaveBeenCalledWith('message:ack', expect.anything());
+      expect(agentService.createSession).not.toHaveBeenCalled();
+      expect(agentService.prompt).not.toHaveBeenCalled();
+      expect(harnessConversations.append).not.toHaveBeenCalled();
+    },
+  );
+
+  // A minimal authenticated-browser connection harness for the send-capability advertisement.
+  const connectAuthedBrowser = async (
+    mode: 'legacy' | 'pi-rpc',
+    clientId: string,
+  ): Promise<{ emit: ReturnType<typeof vi.fn>; disconnect: ReturnType<typeof vi.fn> }> => {
+    process.env['CHAT_HARNESS_RUNTIME'] = mode;
+    const agentService = {
+      getSession: vi.fn().mockReturnValue(undefined),
+      createSession: vi.fn(),
+      recordMessage: vi.fn(),
+      onEvent: vi.fn().mockReturnValue((): void => undefined),
+      addChannel: vi.fn(),
+      prompt: vi.fn().mockResolvedValue(undefined),
+    };
+    const harnessConversations = { append: vi.fn() };
+    const auth = {
+      api: {
+        getSession: vi
+          .fn()
+          .mockResolvedValue({ user: { id: 'user-a' }, session: { id: 'session-a' } }),
+      },
+    };
+    const gateway = new ChatGateway(
+      readyRouter(mode, agentService, harnessConversations) as never,
+      auth as never,
+      { conversations: { addMessage: vi.fn().mockResolvedValue(undefined) } } as never,
+      { getManifest: vi.fn().mockReturnValue({ commands: [] }) } as never,
+      {} as never,
+      {} as never,
+    );
+    const client = {
+      id: clientId,
+      handshake: { auth: {}, headers: { cookie: 'session=abc' } },
+      data: {} as Record<string, unknown>,
+      emit: vi.fn(),
+      disconnect: vi.fn(),
+    };
+    await gateway.handleConnection(client as never);
+    return client as never;
+  };
+
+  it('advertises legacy-message exactly once to an authenticated browser in legacy mode (Task 5 MAJOR-1)', async () => {
+    const client = await connectAuthedBrowser('legacy', 'browser-cap-legacy');
+
+    // Legacy mode: the connected Gateway handles the `message` event, so it advertises
+    // `legacy-message` — targeted, connection-bound, exactly once.
+    expect(client.emit).toHaveBeenCalledWith('chat:send-capability', {
+      protocol: 'legacy-message',
+      connectionId: 'browser-cap-legacy',
+    });
+    const capabilityCalls = client.emit.mock.calls.filter(
+      (call: unknown[]) => call[0] === 'chat:send-capability',
+    );
+    expect(capabilityCalls).toHaveLength(1);
+    expect(client.disconnect).not.toHaveBeenCalled();
+  });
+
+  it('advertises unavailable (never turn-send) to an authenticated browser in pi-rpc mode (Task 5 MAJOR-1)', async () => {
+    const client = await connectAuthedBrowser('pi-rpc', 'browser-cap-pirpc');
+
+    // pi-rpc mode: the legacy `message` handler fails closed and the authenticated `turn:send`
+    // handler lands in Task 15, so Task 5 advertises `unavailable` — never `turn-send`.
+    expect(client.emit).toHaveBeenCalledWith('chat:send-capability', {
+      protocol: 'unavailable',
+      connectionId: 'browser-cap-pirpc',
+    });
+    const capabilityCalls = client.emit.mock.calls.filter(
+      (call: unknown[]) => call[0] === 'chat:send-capability',
+    );
+    expect(capabilityCalls).toHaveLength(1);
+    expect(capabilityCalls[0]?.[1]).not.toMatchObject({ protocol: 'turn-send' });
+  });
+
+  it.each(['legacy', 'pi-rpc'] as const)(
+    'never advertises send-capability to a Discord service socket (%s mode, Task 5 MAJOR-1)',
+    async (mode) => {
+      process.env['CHAT_HARNESS_RUNTIME'] = mode;
+      process.env['DISCORD_SERVICE_TOKEN'] = 'super-secret-discord-token';
+      const agentService = {
+        getSession: vi.fn().mockReturnValue(undefined),
+        createSession: vi.fn(),
+        recordMessage: vi.fn(),
+        onEvent: vi.fn().mockReturnValue((): void => undefined),
+        addChannel: vi.fn(),
+        prompt: vi.fn().mockResolvedValue(undefined),
+      };
+      const gateway = new ChatGateway(
+        readyRouter(mode, agentService, { append: vi.fn() }) as never,
+        { api: { getSession: vi.fn() } } as never,
+        { conversations: { addMessage: vi.fn().mockResolvedValue(undefined) } } as never,
+        {} as never,
+        {} as never,
+        {} as never,
+      );
+      const client = {
+        id: `discord-service-${mode}`,
+        handshake: { auth: { discordServiceToken: 'super-secret-discord-token' }, headers: {} },
+        data: {} as Record<string, unknown>,
+        emit: vi.fn(),
+        disconnect: vi.fn(),
+      };
+
+      await gateway.handleConnection(client as never);
+
+      // The trusted Discord service socket is not a browser; it never receives a browser
+      // send-protocol advertisement.
+      expect(client.data.discordService).toBe(true);
+      expect(client.emit).not.toHaveBeenCalledWith('chat:send-capability', expect.anything());
+      delete process.env['DISCORD_SERVICE_TOKEN'];
+    },
+  );
+
+  // Record-and-forward instrumentation at the REAL returned-lease boundary: wrap the lease's own
+  // dispatch/dispose so the test observes the Gateway's invocation counts through the real
+  // ChatRuntimeRouter -> EmbeddedChatRuntime path — no canned lease, synthesized method, or shim.
+  const instrumentLease = (
+    router: ChatRuntimeRouter,
+    order: string[],
+    counters: { dispatch: number; dispose: number },
+  ): void => {
+    const realPrepare = router.prepareLegacySocketTurn.bind(router) as (
+      ...args: unknown[]
+    ) => Promise<{ ok: boolean; value?: { dispatch: () => unknown; dispose: () => unknown } }>;
+    vi.spyOn(router, 'prepareLegacySocketTurn').mockImplementation((async (...args: unknown[]) => {
+      const result = await realPrepare(...args);
+      if (result.ok && result.value) {
+        const lease = result.value;
+        const realDispatch = lease.dispatch.bind(lease);
+        const realDispose = lease.dispose.bind(lease);
+        lease.dispatch = (): unknown => {
+          counters.dispatch += 1;
+          order.push('dispatch');
+          return realDispatch();
+        };
+        lease.dispose = (): unknown => {
+          counters.dispose += 1;
+          return realDispose();
+        };
+      }
+      return result;
+    }) as never);
+  };
+
+  it('orders a legacy browser turn persist -> ack -> lease.dispatch -> prompt, each exactly once (Task 5 G2)', async () => {
+    process.env['CHAT_HARNESS_RUNTIME'] = 'legacy';
+    const order: string[] = [];
+    const counters = { dispatch: 0, dispose: 0 };
+    const session = {
+      provider: 'configured-provider',
+      modelId: 'configured-model',
+      piSession: {
+        thinkingLevel: 'medium',
+        getAvailableThinkingLevels: (): string[] => ['medium'],
+      },
+    };
+    const agentService = {
+      getSession: vi.fn().mockReturnValue(undefined),
+      createSession: vi.fn().mockResolvedValue(session),
+      recordMessage: vi.fn(),
+      onEvent: vi.fn().mockReturnValue((): void => undefined),
+      addChannel: vi.fn(),
+      removeChannel: vi.fn(),
+      prompt: vi.fn().mockImplementation(async (): Promise<void> => {
+        order.push('prompt');
+      }),
+    };
+    const harnessConversations = { append: vi.fn() };
+    const brain = {
+      conversations: {
+        findById: vi.fn().mockResolvedValue({ id: 'conversation-order-1' }),
+        findMessages: vi.fn().mockResolvedValue([]),
+        create: vi.fn().mockResolvedValue(undefined),
+        update: vi.fn().mockResolvedValue(undefined),
+        addMessage: vi.fn().mockImplementation(async (): Promise<void> => {
+          order.push('persist');
+        }),
+      },
+    };
+    const router = readyRouter('legacy', agentService, harnessConversations);
+    instrumentLease(router, order, counters);
+    const gateway = new ChatGateway(
+      router as never,
+      { api: { getSession: vi.fn() } } as never,
+      brain as never,
+      {} as never,
+      {} as never,
+      {} as never,
+    );
+    const client = {
+      id: 'browser-order-1',
+      data: { user: { id: 'user-a' } },
+      emit: vi.fn().mockImplementation((event: string): void => {
+        if (event === 'message:ack') order.push('ack');
+      }),
+    };
+
+    await gateway.handleMessage(
+      client as never,
+      {
+        conversationId: 'conversation-order-1',
+        content: 'ordered hello',
+      } as never,
+    );
+
+    // The Gateway persists the user turn, THEN acks, THEN invokes the one-shot lease dispatch which
+    // finally prompts. Observed at the real lease boundary: dispatch is invoked exactly once and the
+    // runtime prompts exactly once.
+    expect(order).toEqual(['persist', 'ack', 'dispatch', 'prompt']);
+    expect(counters.dispatch).toBe(1);
+    expect(agentService.prompt).toHaveBeenCalledTimes(1);
+    expect(harnessConversations.append).not.toHaveBeenCalled();
+  });
+
+  it('drops a legacy browser turn on persistence failure: zero info/ack/dispatch/prompt, one clean disposal (Task 5 G2)', async () => {
+    process.env['CHAT_HARNESS_RUNTIME'] = 'legacy';
+    const order: string[] = [];
+    const counters = { dispatch: 0, dispose: 0 };
+    const unsub = vi.fn();
+    const session = {
+      provider: 'configured-provider',
+      modelId: 'configured-model',
+      piSession: {
+        thinkingLevel: 'medium',
+        getAvailableThinkingLevels: (): string[] => ['medium'],
+      },
+    };
+    const agentService = {
+      getSession: vi.fn().mockReturnValue(undefined),
+      createSession: vi.fn().mockResolvedValue(session),
+      recordMessage: vi.fn(),
+      onEvent: vi.fn().mockReturnValue(unsub),
+      addChannel: vi.fn(),
+      removeChannel: vi.fn(),
+      prompt: vi.fn().mockResolvedValue(undefined),
+    };
+    const harnessConversations = { append: vi.fn() };
+    const brain = {
+      conversations: {
+        findById: vi.fn().mockResolvedValue({ id: 'conversation-fail-1' }),
+        findMessages: vi.fn().mockResolvedValue([]),
+        create: vi.fn().mockResolvedValue(undefined),
+        update: vi.fn().mockResolvedValue(undefined),
+        addMessage: vi.fn().mockRejectedValue(new Error('persistence unavailable')),
+      },
+    };
+    const router = readyRouter('legacy', agentService, harnessConversations);
+    instrumentLease(router, order, counters);
+    const gateway = new ChatGateway(
+      router as never,
+      { api: { getSession: vi.fn() } } as never,
+      brain as never,
+      {} as never,
+      {} as never,
+      {} as never,
+    );
+    const client = {
+      id: 'browser-fail-1',
+      data: { user: { id: 'user-a' } },
+      emit: vi.fn(),
+    };
+
+    await gateway.handleMessage(
+      client as never,
+      {
+        conversationId: 'conversation-fail-1',
+        content: 'will fail persistence',
+      } as never,
+    );
+
+    // A failed user-message persistence aborts the turn with no accept-then-lose: no session:info,
+    // no ack, the lease never dispatches or prompts, and the just-prepared lease is disposed exactly
+    // once (listener/channel cleanup) without throwing. The fixed safe error is surfaced.
+    expect(client.emit).not.toHaveBeenCalledWith('session:info', expect.anything());
+    expect(client.emit).not.toHaveBeenCalledWith('message:ack', expect.anything());
+    expect(counters.dispatch).toBe(0);
+    expect(agentService.prompt).not.toHaveBeenCalled();
+    expect(counters.dispose).toBe(1);
+    expect(unsub).toHaveBeenCalledTimes(1);
+    expect(client.emit).toHaveBeenCalledWith(
+      'error',
+      expect.objectContaining({ code: 'persist_failed' }),
+    );
+    expect(harnessConversations.append).not.toHaveBeenCalled();
+  });
+});
+
 describe('Chat DTO validation', () => {
   it('rejects unsupported message roles', () => {
     const dto = Object.assign(new SendMessageDto(), {

apps/gateway/src/chat/chat-runtime-router.spec.ts

@@ -0,0 +1,920 @@
+import 'reflect-metadata';
+import { Global, Module } from '@nestjs/common';
+import { Test, type TestingModule } from '@nestjs/testing';
+import { afterAll, afterEach, beforeAll, describe, expect, it } from 'vitest';
+import type { HarnessAdapter, HarnessConversationService } from '@mosaicstack/types';
+import { AgentService } from '../agent/agent.service.js';
+import { AuthGuard } from '../auth/auth.guard.js';
+import { CommandsModule } from '../commands/commands.module.js';
+import { HarnessModule } from '../harness/harness.module.js';
+import { ChatModule } from './chat.module.js';
+import { ChatGateway } from './chat.gateway.js';
+import { HarnessRegistry } from '../harness/harness.registry.js';
+import {
+  HARNESS_CONVERSATION_SERVICE,
+  HARNESS_CONVERSATION_SERVICE_UNAVAILABLE,
+  HARNESS_REGISTRY,
+  type HarnessConversationServiceBinding,
+} from '../harness/harness.tokens.js';
+import { ChatRuntimeRouter } from './chat-runtime-router.js';
+import {
+  ChatRuntimeUnavailableError,
+  ownConversation,
+  type ChatRuntime,
+  type ChatRuntimeMode,
+  type LegacyEmbeddedChatPort,
+  type LegacyRuntimeStream,
+  type LegacySessionPresentation,
+  type LegacySocketTurnLease,
+  type OwnedConversationContext,
+} from './chat-runtime.js';
+import { AppModule } from '../app.module.js';
+import { ProviderService } from '../agent/provider.service.js';
+
+/**
+ * Task Five, Step One (router). Proves the `ChatRuntimeRouter` resolves exactly one
+ * runtime by mode, fails closed at init when `pi-rpc` preconditions are unmet, and
+ * never downgrades `pi-rpc` to embedded execution. Red-first: the router is an
+ * unimplemented stub, so every behavioural assertion below fails until Step Three.
+ */
+
+const embedded: ChatRuntime = { kind: 'embedded' };
+const harness: ChatRuntime = { kind: 'harness' };
+
+/** A structurally-complete, non-sentinel conversation service. Its methods are never invoked here. */
+const boundConversationService = {
+  attach: () => Promise.reject(new Error('unused')),
+  detach: () => Promise.reject(new Error('unused')),
+  send: () => Promise.reject(new Error('unused')),
+
+  subscribeFrom: async function* () {
+    throw new Error('unused');
+  },
+} as unknown as HarnessConversationService;
+
+function registryWith(adapterIds: readonly string[]): HarnessRegistry {
+  const registry = new HarnessRegistry();
+  for (const id of adapterIds) {
+    registry.register({
+      id,
+      describe: () => Promise.reject(new Error('unused')),
+      catalog: () => Promise.reject(new Error('unused')),
+      create: () => Promise.reject(new Error('unused')),
+      resume: () => Promise.reject(new Error('unused')),
+    } as HarnessAdapter);
+  }
+  return registry;
+}
+
+function buildRouter(
+  mode: ChatRuntimeMode,
+  opts: { adapters: readonly string[]; service: HarnessConversationServiceBinding },
+): ChatRuntimeRouter {
+  return new ChatRuntimeRouter(registryWith(opts.adapters), opts.service, embedded, harness, mode);
+}
+
+/**
+ * Tear down a module that was deliberately driven to a fail-closed init.
+ * `NestApplicationContext.close()` re-awaits the module's `initializationPromise` before disposing
+ * (nest-application-context.js:127); when `init()` rejected, that await re-throws the SAME typed
+ * startup error, this time into teardown. Each caller here has already captured and asserted that
+ * exact `ChatRuntimeUnavailableError` via `initError`, so the re-throw is expected teardown noise —
+ * swallow ONLY that error, and surface anything else so a genuine teardown fault still fails loudly.
+ */
+async function closeIgnoringFailedInit(moduleRef: TestingModule): Promise<void> {
+  await moduleRef.close().catch((err: unknown) => {
+    if (err instanceof ChatRuntimeUnavailableError) return;
+    throw err;
+  });
+}
+
+describe('ChatRuntimeRouter', () => {
+  it('resolves only the harness runtime in pi-rpc mode when pi adapter and conversation service are present', () => {
+    const router = buildRouter('pi-rpc', {
+      adapters: ['pi'],
+      service: boundConversationService,
+    });
+
+    expect(() => router.onModuleInit()).not.toThrow();
+    expect(router.active).toBe(harness);
+    expect(router.active.kind).toBe('harness');
+  });
+
+  it('resolves only the embedded runtime in legacy mode and skips the pi preconditions', () => {
+    // Empty registry + unavailable service: legacy must ignore both and still start.
+    const router = buildRouter('legacy', {
+      adapters: [],
+      service: HARNESS_CONVERSATION_SERVICE_UNAVAILABLE,
+    });
+
+    expect(() => router.onModuleInit()).not.toThrow();
+    expect(router.active).toBe(embedded);
+    expect(router.active.kind).toBe('embedded');
+  });
+
+  it('fails closed at init when pi-rpc mode has no registered pi adapter', () => {
+    const router = buildRouter('pi-rpc', {
+      adapters: [],
+      service: boundConversationService,
+    });
+
+    expect(() => router.onModuleInit()).toThrow(ChatRuntimeUnavailableError);
+    try {
+      router.onModuleInit();
+      expect.unreachable('onModuleInit must throw when the pi adapter is absent');
+    } catch (err) {
+      expect(err).toBeInstanceOf(ChatRuntimeUnavailableError);
+      expect((err as ChatRuntimeUnavailableError).reason).toBe('adapter_unavailable');
+      expect((err as ChatRuntimeUnavailableError).code).toBe('runtime_unsupported');
+    }
+  });
+
+  it('fails closed at init when pi-rpc mode has the unavailable conversation-service sentinel', () => {
+    const router = buildRouter('pi-rpc', {
+      adapters: ['pi'],
+      service: HARNESS_CONVERSATION_SERVICE_UNAVAILABLE,
+    });
+
+    try {
+      router.onModuleInit();
+      expect.unreachable('onModuleInit must throw when the conversation service is unbound');
+    } catch (err) {
+      expect(err).toBeInstanceOf(ChatRuntimeUnavailableError);
+      expect((err as ChatRuntimeUnavailableError).reason).toBe('conversation_service_unavailable');
+      expect((err as ChatRuntimeUnavailableError).code).toBe('runtime_unsupported');
+    }
+  });
+
+  it('never falls back to embedded execution when pi-rpc preconditions are unmet', () => {
+    const router = buildRouter('pi-rpc', {
+      adapters: [],
+      service: HARNESS_CONVERSATION_SERVICE_UNAVAILABLE,
+    });
+
+    expect(() => router.onModuleInit()).toThrow(ChatRuntimeUnavailableError);
+    // A failed pi-rpc init must not silently expose the embedded runtime.
+    expect(() => router.active).toThrow();
+    let leaked: ChatRuntime | undefined;
+    try {
+      leaked = router.active;
+    } catch {
+      leaked = undefined;
+    }
+    expect(leaked).not.toBe(embedded);
+  });
+
+  it('exposes only fixed, browser-safe failure text (no raw provider or exception detail)', () => {
+    const router = buildRouter('pi-rpc', {
+      adapters: [],
+      service: boundConversationService,
+    });
+
+    try {
+      router.onModuleInit();
+      expect.unreachable('onModuleInit must throw');
+    } catch (err) {
+      const message = (err as ChatRuntimeUnavailableError).message;
+      expect(message).toBe(
+        'The pi-rpc chat runtime is unavailable: no "pi" harness adapter is registered.',
+      );
+      expect(message).not.toMatch(/Error:|\bat \b|node_modules|Symbol\(/);
+    }
+  });
+});
+
+/**
+ * Task Five, Step Three — legacy port operations fail closed under pi-rpc (direct valid-input).
+ *
+ * The unit suite above constructs the router but never invokes a legacy port operation, so the
+ * six per-operation inner `if (this.mode === 'pi-rpc')` guards are unexercised — a mutation that
+ * deletes one of them SURVIVES for lack of a test that drives that operation. This group closes
+ * that gap the right way: it drives each of the six operations DIRECTLY, in pi-rpc mode, with a
+ * valid branded {@link OwnedConversationContext} and valid input, against a recording embedded
+ * stub whose method returns a distinguishable `ok:true` success and increments a per-op counter.
+ *
+ * For each operation:
+ *  - pi-rpc test asserts the exact frozen `{ ok:false, code:'runtime_unsupported', retryable:false }`
+ *    result AND that the embedded stub was touched zero times (no effects);
+ *  - the paired legacy test proves that same stub method IS reached and returns its distinguishable
+ *    success when the mode does not refuse — so the pi-rpc zero-invocation assertion is meaningful,
+ *    not vacuously true because the stub could never be called.
+ *
+ * Deleting ONLY one operation's inner guard makes THAT operation's pi-rpc test behaviorally RED
+ * (the router returns the embedded `ok:true` value and records the call), with every outer guard
+ * and the other five inner guards intact. `next` is untouched; nothing here changes production.
+ */
+describe('ChatRuntimeRouter — legacy port ops fail closed under pi-rpc (Task Five, Step Three)', () => {
+  const RUNTIME_UNSUPPORTED = {
+    ok: false,
+    code: 'runtime_unsupported',
+    retryable: false,
+  } as const;
+
+  const PRESENTATION: LegacySessionPresentation = {
+    provider: 'embedded-provider',
+    modelId: 'embedded-model',
+    thinkingLevel: 'low',
+    availableThinkingLevels: ['low', 'high'],
+  };
+
+  const stream: LegacyRuntimeStream = {
+    channelId: 'websocket:test-socket',
+    onEvent: () => {},
+  };
+
+  const ctx = (): OwnedConversationContext =>
+    ownConversation('conversation-1', { userId: 'user-1', tenantId: 'tenant-1' });
+
+  /**
+   * Per-operation invocation counters with declared keys (not an index signature) so each
+   * `calls.<op>` is definitely `number` under `noUncheckedIndexedAccess`.
+   */
+  type LegacyPortCallCounts = {
+    completeLegacyRestTurn: number;
+    prepareLegacySocketTurn: number;
+    setLegacyThinking: number;
+    abortLegacyTurn: number;
+    applyLegacyModelOverride: number;
+    readLegacySessionPresentation: number;
+    dispatchVerifiedDiscordIngress: number;
+  };
+
+  /**
+   * An embedded port that records every invocation and returns a distinguishable `ok:true`
+   * value per operation. If a router op reaches it (its guard removed), both the recorded call
+   * count and the returned `ok:true` value diverge from the frozen `runtime_unsupported` result.
+   */
+  function recordingEmbeddedPort(): {
+    port: ChatRuntime & LegacyEmbeddedChatPort;
+    calls: LegacyPortCallCounts;
+  } {
+    const calls: LegacyPortCallCounts = {
+      completeLegacyRestTurn: 0,
+      prepareLegacySocketTurn: 0,
+      setLegacyThinking: 0,
+      abortLegacyTurn: 0,
+      applyLegacyModelOverride: 0,
+      readLegacySessionPresentation: 0,
+      dispatchVerifiedDiscordIngress: 0,
+    };
+    const lease: LegacySocketTurnLease = {
+      presentation: PRESENTATION,
+      dispatch: () => Promise.resolve({ ok: true, value: undefined }),
+      dispose: () => Promise.resolve(),
+    };
+    const port: ChatRuntime & LegacyEmbeddedChatPort = {
+      kind: 'embedded',
+      completeLegacyRestTurn: () => {
+        calls.completeLegacyRestTurn += 1;
+        return Promise.resolve({
+          ok: true,
+          value: { text: 'EMBEDDED-REST', presentation: PRESENTATION },
+        });
+      },
+      prepareLegacySocketTurn: () => {
+        calls.prepareLegacySocketTurn += 1;
+        return Promise.resolve({ ok: true, value: lease });
+      },
+      setLegacyThinking: () => {
+        calls.setLegacyThinking += 1;
+        return { ok: true, value: PRESENTATION };
+      },
+      abortLegacyTurn: () => {
+        calls.abortLegacyTurn += 1;
+        return Promise.resolve({ ok: true, value: undefined });
+      },
+      applyLegacyModelOverride: () => {
+        calls.applyLegacyModelOverride += 1;
+        return { ok: true, value: PRESENTATION };
+      },
+      readLegacySessionPresentation: () => {
+        calls.readLegacySessionPresentation += 1;
+        return { ok: true, value: PRESENTATION };
+      },
+      dispatchVerifiedDiscordIngress: () => {
+        calls.dispatchVerifiedDiscordIngress += 1;
+        return Promise.resolve({
+          ok: true,
+          value: {
+            presentation: PRESENTATION,
+            dispatch: () => Promise.resolve({ ok: true, value: undefined }),
+            dispose: () => Promise.resolve(),
+          },
+        });
+      },
+    };
+    return { port, calls };
+  }
+
+  function piRouter(port: ChatRuntime & LegacyEmbeddedChatPort): ChatRuntimeRouter {
+    return new ChatRuntimeRouter(
+      registryWith(['pi']),
+      boundConversationService,
+      port,
+      harness,
+      'pi-rpc',
+    );
+  }
+  function legacyRouter(port: ChatRuntime & LegacyEmbeddedChatPort): ChatRuntimeRouter {
+    return new ChatRuntimeRouter(
+      registryWith([]),
+      boundConversationService,
+      port,
+      harness,
+      'legacy',
+    );
+  }
+
+  // completeLegacyRestTurn ---------------------------------------------------
+  it('completeLegacyRestTurn refuses with runtime_unsupported and never touches embedded under pi-rpc', async () => {
+    const { port, calls } = recordingEmbeddedPort();
+    const result = await piRouter(port).completeLegacyRestTurn(ctx(), { content: 'hello' });
+    expect(result).toEqual(RUNTIME_UNSUPPORTED);
+    expect(calls.completeLegacyRestTurn).toBe(0);
+  });
+  it('completeLegacyRestTurn delegates to embedded under legacy (guard is the sole gate)', async () => {
+    const { port, calls } = recordingEmbeddedPort();
+    const result = await legacyRouter(port).completeLegacyRestTurn(ctx(), { content: 'hello' });
+    expect(result.ok).toBe(true);
+    expect(calls.completeLegacyRestTurn).toBe(1);
+  });
+
+  // prepareLegacySocketTurn --------------------------------------------------
+  it('prepareLegacySocketTurn refuses with runtime_unsupported and never touches embedded under pi-rpc', async () => {
+    const { port, calls } = recordingEmbeddedPort();
+    const result = await piRouter(port).prepareLegacySocketTurn(
+      ctx(),
+      { content: 'hello' },
+      stream,
+    );
+    expect(result).toEqual(RUNTIME_UNSUPPORTED);
+    expect(calls.prepareLegacySocketTurn).toBe(0);
+  });
+  it('prepareLegacySocketTurn delegates to embedded under legacy (guard is the sole gate)', async () => {
+    const { port, calls } = recordingEmbeddedPort();
+    const result = await legacyRouter(port).prepareLegacySocketTurn(
+      ctx(),
+      { content: 'hello' },
+      stream,
+    );
+    expect(result.ok).toBe(true);
+    expect(calls.prepareLegacySocketTurn).toBe(1);
+  });
+
+  // setLegacyThinking (sync) -------------------------------------------------
+  it('setLegacyThinking refuses with runtime_unsupported and never touches embedded under pi-rpc', () => {
+    const { port, calls } = recordingEmbeddedPort();
+    const result = piRouter(port).setLegacyThinking(ctx(), 'high');
+    expect(result).toEqual(RUNTIME_UNSUPPORTED);
+    expect(calls.setLegacyThinking).toBe(0);
+  });
+  it('setLegacyThinking delegates to embedded under legacy (guard is the sole gate)', () => {
+    const { port, calls } = recordingEmbeddedPort();
+    const result = legacyRouter(port).setLegacyThinking(ctx(), 'high');
+    expect(result.ok).toBe(true);
+    expect(calls.setLegacyThinking).toBe(1);
+  });
+
+  // abortLegacyTurn ----------------------------------------------------------
+  it('abortLegacyTurn refuses with runtime_unsupported and never touches embedded under pi-rpc', async () => {
+    const { port, calls } = recordingEmbeddedPort();
+    const result = await piRouter(port).abortLegacyTurn(ctx());
+    expect(result).toEqual(RUNTIME_UNSUPPORTED);
+    expect(calls.abortLegacyTurn).toBe(0);
+  });
+  it('abortLegacyTurn delegates to embedded under legacy (guard is the sole gate)', async () => {
+    const { port, calls } = recordingEmbeddedPort();
+    const result = await legacyRouter(port).abortLegacyTurn(ctx());
+    expect(result.ok).toBe(true);
+    expect(calls.abortLegacyTurn).toBe(1);
+  });
+
+  // applyLegacyModelOverride (sync) ------------------------------------------
+  it('applyLegacyModelOverride refuses with runtime_unsupported and never touches embedded under pi-rpc', () => {
+    const { port, calls } = recordingEmbeddedPort();
+    const result = piRouter(port).applyLegacyModelOverride(ctx(), 'model-x');
+    expect(result).toEqual(RUNTIME_UNSUPPORTED);
+    expect(calls.applyLegacyModelOverride).toBe(0);
+  });
+  it('applyLegacyModelOverride delegates to embedded under legacy (guard is the sole gate)', () => {
+    const { port, calls } = recordingEmbeddedPort();
+    const result = legacyRouter(port).applyLegacyModelOverride(ctx(), 'model-x');
+    expect(result.ok).toBe(true);
+    expect(calls.applyLegacyModelOverride).toBe(1);
+  });
+
+  // readLegacySessionPresentation (sync) -------------------------------------
+  it('readLegacySessionPresentation refuses with runtime_unsupported and never touches embedded under pi-rpc', () => {
+    const { port, calls } = recordingEmbeddedPort();
+    const result = piRouter(port).readLegacySessionPresentation(ctx());
+    expect(result).toEqual(RUNTIME_UNSUPPORTED);
+    expect(calls.readLegacySessionPresentation).toBe(0);
+  });
+  it('readLegacySessionPresentation delegates to embedded under legacy (guard is the sole gate)', () => {
+    const { port, calls } = recordingEmbeddedPort();
+    const result = legacyRouter(port).readLegacySessionPresentation(ctx());
+    expect(result.ok).toBe(true);
+    expect(calls.readLegacySessionPresentation).toBe(1);
+  });
+
+  // dispatchVerifiedDiscordIngress delegates in BOTH modes (embedded-only, no guard) ---------
+  it('dispatchVerifiedDiscordIngress delegates to embedded under pi-rpc (embedded-only, no mode guard)', async () => {
+    const { port, calls } = recordingEmbeddedPort();
+    const discordCtx = ctx() as unknown as Parameters<
+      ChatRuntimeRouter['dispatchVerifiedDiscordIngress']
+    >[0];
+    const result = await piRouter(port).dispatchVerifiedDiscordIngress(discordCtx, stream);
+    expect(result.ok).toBe(true);
+    expect(calls.dispatchVerifiedDiscordIngress).toBe(1);
+  });
+});
+
+/**
+ * Task Five, Step Two — group 1 (real Nest module-graph readiness).
+ *
+ * The unit suite above constructs the router directly. This group drives the SAME contract
+ * through a real NestJS graph: it imports the production `HarnessModule` (the proven-booting
+ * idiom from harness.controller.spec.ts) so the router resolves the REAL, empty `HarnessRegistry`
+ * via the real `HARNESS_REGISTRY` token, then runs the router's `OnModuleInit` through the Nest
+ * lifecycle (`moduleRef.init()`). Red-first: the router is an unimplemented stub whose
+ * `onModuleInit` throws a generic Error, so:
+ *   - readiness cases fail because the graph never comes up (init rejects), and
+ *   - fail-closed cases fail because a generic stub throw is NOT the SPECIFIC typed
+ *     `ChatRuntimeUnavailableError` (reason/code) the contract demands — a stub that
+ *     "throws anything" cannot mask these greens.
+ * The router is NOT wired into a production module yet, so it is provided here via a factory
+ * over the real registry token. Importing the real `ChatModule` bare is deliberately avoided:
+ * it injects `AgentService` without importing `AgentModule`, so its graph fails to RESOLVE — a
+ * collection/DI error, not a behavioural red. `next` is untouched; nothing here implements the router.
+ */
+describe('ChatRuntimeRouter — real Nest module-graph readiness (Task Five, Step Two group 1)', () => {
+  async function bootRouterGraph(
+    mode: ChatRuntimeMode,
+    opts: { adapters: readonly string[]; service: HarnessConversationServiceBinding },
+  ) {
+    const moduleRef = await Test.createTestingModule({
+      imports: [HarnessModule],
+      providers: [
+        {
+          provide: ChatRuntimeRouter,
+          useFactory: (registry: HarnessRegistry) =>
+            new ChatRuntimeRouter(registry, opts.service, embedded, harness, mode),
+          inject: [HARNESS_REGISTRY],
+        },
+      ],
+    })
+      // The imported HarnessModule's controllers reference AuthGuard (an HTTP-only concern,
+      // never exercised here); stub it so the graph resolves. The registry is NOT overridden —
+      // group 1 asserts against the genuine production HarnessRegistry.
+      .overrideGuard(AuthGuard)
+      .useValue({ canActivate: () => true })
+      .compile();
+
+    // Resolve the production registry singleton and register the requested adapters ON IT, so
+    // the router (which injects the same singleton) sees them when its lifecycle hook runs.
+    const registry = moduleRef.get<HarnessRegistry>(HARNESS_REGISTRY, { strict: false });
+    for (const id of opts.adapters) {
+      registry.register({
+        id,
+        describe: () => Promise.reject(new Error('unused')),
+        catalog: () => Promise.reject(new Error('unused')),
+        create: () => Promise.reject(new Error('unused')),
+        resume: () => Promise.reject(new Error('unused')),
+      } as HarnessAdapter);
+    }
+    return moduleRef;
+  }
+
+  // Capture an init rejection without letting a resolved init masquerade as success.
+  const initError = (moduleRef: { init(): Promise<unknown> }): Promise<unknown> =>
+    moduleRef.init().then(
+      () => new Error('module init resolved but the contract requires it to reject'),
+      (err: unknown) => err,
+    );
+
+  it('brings the graph up and resolves only the harness runtime in pi-rpc mode (pi adapter + bound service)', async () => {
+    const moduleRef = await bootRouterGraph('pi-rpc', {
+      adapters: ['pi'],
+      service: boundConversationService,
+    });
+    try {
+      await moduleRef.init();
+      const router = moduleRef.get(ChatRuntimeRouter, { strict: false });
+      expect(router.active).toBe(harness);
+      expect(router.active.kind).toBe('harness');
+    } finally {
+      await moduleRef.close();
+    }
+  });
+
+  it('brings the graph up in legacy mode over the REAL empty HarnessRegistry and resolves only the embedded runtime', async () => {
+    const moduleRef = await bootRouterGraph('legacy', {
+      adapters: [],
+      service: HARNESS_CONVERSATION_SERVICE_UNAVAILABLE,
+    });
+    try {
+      // Defense-in-depth: the production module wires the genuine registry, empty by default —
+      // guards against a test-double registry silently satisfying the readiness check.
+      const registry = moduleRef.get<HarnessRegistry>(HARNESS_REGISTRY, { strict: false });
+      expect(registry).toBeInstanceOf(HarnessRegistry);
+      expect(registry.list()).toHaveLength(0);
+
+      await moduleRef.init();
+      const router = moduleRef.get(ChatRuntimeRouter, { strict: false });
+      expect(router.active).toBe(embedded);
+      expect(router.active.kind).toBe('embedded');
+    } finally {
+      await moduleRef.close();
+    }
+  });
+
+  it('fails closed at module init when pi-rpc mode has no registered pi adapter (specific typed error, not a stub throw)', async () => {
+    const moduleRef = await bootRouterGraph('pi-rpc', {
+      adapters: [],
+      service: boundConversationService,
+    });
+    try {
+      const err = await initError(moduleRef);
+      expect(err).toBeInstanceOf(ChatRuntimeUnavailableError);
+      expect((err as ChatRuntimeUnavailableError).reason).toBe('adapter_unavailable');
+      expect((err as ChatRuntimeUnavailableError).code).toBe('runtime_unsupported');
+    } finally {
+      await closeIgnoringFailedInit(moduleRef);
+    }
+  });
+
+  it('fails closed at module init when pi-rpc mode has the unavailable conversation-service sentinel', async () => {
+    const moduleRef = await bootRouterGraph('pi-rpc', {
+      adapters: ['pi'],
+      service: HARNESS_CONVERSATION_SERVICE_UNAVAILABLE,
+    });
+    try {
+      const err = await initError(moduleRef);
+      expect(err).toBeInstanceOf(ChatRuntimeUnavailableError);
+      expect((err as ChatRuntimeUnavailableError).reason).toBe('conversation_service_unavailable');
+      expect((err as ChatRuntimeUnavailableError).code).toBe('runtime_unsupported');
+    } finally {
+      await closeIgnoringFailedInit(moduleRef);
+    }
+  });
+
+  it('surfaces only fixed, browser-safe failure text when the graph fails closed (no stub/exception detail)', async () => {
+    const moduleRef = await bootRouterGraph('pi-rpc', {
+      adapters: [],
+      service: boundConversationService,
+    });
+    try {
+      const err = await initError(moduleRef);
+      expect(err).toBeInstanceOf(ChatRuntimeUnavailableError);
+      const message = (err as ChatRuntimeUnavailableError).message;
+      expect(message).toBe(
+        'The pi-rpc chat runtime is unavailable: no "pi" harness adapter is registered.',
+      );
+      expect(message).not.toMatch(/Error:|\bat \b|node_modules|Symbol\(|not implemented/);
+    } finally {
+      await closeIgnoringFailedInit(moduleRef);
+    }
+  });
+});
+
+/**
+ * Task Five, Step Two — group 1b (production ChatModule wiring, declaration proof).
+ *
+ * Correction #1 (Scrappy fe3e02) asked for a red that imports the real `ChatModule` and calls
+ * `module.init()`. Investigated and found impractical/masking-prone: `ChatModule` provides
+ * `ChatGateway`, whose 10-argument constructor injects app-global providers (AgentService, AUTH,
+ * BRAIN, RoutingEngineService) plus the Commands/GC/Mcp/Reload subsystems across a forwardRef
+ * cycle. Booting it in isolation is a full-app integration boot — "override only unrelated
+ * dependencies" balloons into faking ~4 subsystems, and `overrideProvider` cannot even grant the
+ * cross-module export-scope visibility ChatGateway needs (probe: `ChatGateway` unresolved at
+ * `CommandExecutorService`). That is exactly the STOP-and-return branch of the directive.
+ *
+ * The faithful, unmaskable cover instead of a fragile boot: read the PRODUCTION `ChatModule`'s own
+ * Nest `@Module` metadata to prove it DECLARES the exclusive router provider and imports the real
+ * `HarnessModule` (the genuine registry source). This inspects the actual module object — not
+ * source text, not a test factory — so nothing can mask it. Group 1 above separately proves the
+ * router RESOLVES against the real, empty `HarnessRegistry` through the Nest lifecycle; the union
+ * of the two covers "the router is wired through ChatModule to the real registry" without the
+ * impractical single-graph boot. RED today (ChatModule provides only ChatGateway and imports only
+ * CommandsModule); GREEN once Step Three registers the router and imports HarnessModule.
+ */
+describe('ChatModule production wiring (Task Five, Step Two group 1b — declaration proof)', () => {
+  // Unwrap a forwardRef(() => Module) import to the module it references; pass others through.
+  const resolveImport = (imp: unknown): unknown =>
+    imp &&
+    typeof imp === 'object' &&
+    typeof (imp as { forwardRef?: unknown }).forwardRef === 'function'
+      ? (imp as { forwardRef: () => unknown }).forwardRef()
+      : imp;
+
+  // A provider entry is either a class (shorthand) or a { provide, ... } object; take its token.
+  const providerToken = (provider: unknown): unknown =>
+    typeof provider === 'function' ? provider : (provider as { provide?: unknown })?.provide;
+
+  it('declares the exclusive ChatRuntimeRouter as a provider on the production ChatModule', () => {
+    const providers: unknown[] = Reflect.getMetadata('providers', ChatModule) ?? [];
+    expect(providers.map(providerToken)).toContain(ChatRuntimeRouter);
+  });
+
+  it('imports the real HarnessModule into the production ChatModule (registry source, not a test double)', () => {
+    const imports: unknown[] = Reflect.getMetadata('imports', ChatModule) ?? [];
+    expect(imports.map(resolveImport)).toContain(HarnessModule);
+  });
+});
+
+/**
+ * Task Five, Step Two — group 1c (bounded real-`ChatModule` boot).
+ *
+ * Scrappy adjudication d67d2b (option c): boot the ACTUAL production `ChatModule` as the SUT and
+ * assert the exclusive router resolves THROUGH it — the single-graph proof group 1 (router over the
+ * real registry) and group 1b (production-module metadata) each cover only a half of. The heavy,
+ * UNRELATED cycle is the only thing bounded away, per the established isolation pattern in
+ * `apps/gateway/src/agent/hermes-runtime-reachability.e2e.test.ts`:
+ *   - `CommandsModule` (drags the Commands <-> Reload <-> Chat forwardRef cycle plus GC/Mcp/queue)
+ *     is replaced wholesale with an empty module via `.overrideModule(...).useModule(...)`;
+ *   - `ChatGateway` (10-arg constructor, an HTTP/socket concern never exercised here) is replaced
+ *     with an inert value;
+ *   - the sole legacy-controller dependency, `AgentService`, is supplied by a tiny `@Global()` stub;
+ *   - the HTTP-only `AuthGuard` is stubbed.
+ * Nothing about the router, `HarnessModule`, the registry, or the conversation-service binding is
+ * faked in the production-legacy case — those are retrieved from the REAL `ChatModule` graph. Mode
+ * is driven only through the production `CHAT_HARNESS_RUNTIME` env contract (`resolveChatRuntimeMode`).
+ *
+ * Red-first: today `ChatModule` neither imports `HarnessModule` nor provides `ChatRuntimeRouter`, so
+ * the booted graph contains no router/registry/conversation-service tokens. `init()` may resolve
+ * (there is no router lifecycle hook yet to reject), so every case fails on the MISSING actual
+ * router/registry/service wiring — not on unrelated DI, which is bounded away. GREEN at Step Three
+ * once `ChatModule` imports `HarnessModule`, provides the exclusive router, and binds the
+ * conversation-service token (defaulting to the unavailable sentinel).
+ */
+describe('ChatModule bounded real boot (Task Five, Step Two group 1c)', () => {
+  // The unrelated heavy cycle, replaced wholesale — not stubbed provider-by-provider.
+  @Module({})
+  class EmptyCommandsModule {}
+
+  // The ONLY genuine legacy dependency of the real ChatController, supplied inertly and globally so
+  // the pre-refactor controller instantiates without dragging AgentModule into the graph.
+  @Global()
+  @Module({
+    providers: [{ provide: AgentService, useValue: {} }],
+    exports: [AgentService],
+  })
+  class LegacyControllerDepsModule {}
+
+  const ORIGINAL_RUNTIME_ENV = process.env['CHAT_HARNESS_RUNTIME'];
+  afterEach(() => {
+    if (ORIGINAL_RUNTIME_ENV === undefined) delete process.env['CHAT_HARNESS_RUNTIME'];
+    else process.env['CHAT_HARNESS_RUNTIME'] = ORIGINAL_RUNTIME_ENV;
+  });
+
+  /**
+   * Boot the real ChatModule with only the unrelated cycle bounded away. `mode` is set through the
+   * genuine production env contract before providers instantiate. The optional overrides replace
+   * the registry / conversation-service the router injects, exercising the pi-rpc precondition
+   * branches through the ACTUAL module (they are no-ops today because those tokens are not yet in
+   * the graph — which is exactly why the router-retrieval assertions go red).
+   */
+  async function bootChatModule(
+    mode: ChatRuntimeMode,
+    overrides: {
+      registryAdapters?: readonly string[];
+      conversationService?: HarnessConversationServiceBinding;
+    } = {},
+  ): Promise<TestingModule> {
+    if (mode === 'pi-rpc') process.env['CHAT_HARNESS_RUNTIME'] = 'pi-rpc';
+    else delete process.env['CHAT_HARNESS_RUNTIME'];
+
+    let builder = Test.createTestingModule({
+      imports: [LegacyControllerDepsModule, ChatModule],
+    })
+      .overrideModule(CommandsModule)
+      .useModule(EmptyCommandsModule)
+      .overrideProvider(ChatGateway)
+      .useValue({})
+      .overrideGuard(AuthGuard)
+      .useValue({ canActivate: () => true });
+
+    if (overrides.registryAdapters) {
+      builder = builder
+        .overrideProvider(HARNESS_REGISTRY)
+        .useValue(registryWith(overrides.registryAdapters));
+    }
+    if (overrides.conversationService !== undefined) {
+      builder = builder
+        .overrideProvider(HARNESS_CONVERSATION_SERVICE)
+        .useValue(overrides.conversationService);
+    }
+    return builder.compile();
+  }
+
+  // Capture an init rejection without letting a resolved init masquerade as success.
+  const initError = (moduleRef: TestingModule): Promise<unknown> =>
+    moduleRef.init().then(
+      () => new Error('module init resolved but the contract requires it to reject'),
+      (err: unknown) => err,
+    );
+
+  it('legacy mode: the actual router resolves the embedded runtime, the actual registry is empty, and the conversation-service token is the unavailable sentinel', async () => {
+    const moduleRef = await bootChatModule('legacy');
+    try {
+      await moduleRef.init();
+      const router = moduleRef.get(ChatRuntimeRouter, { strict: false });
+      expect(router.active.kind).toBe('embedded');
+
+      const registry = moduleRef.get<HarnessRegistry>(HARNESS_REGISTRY, { strict: false });
+      expect(registry).toBeInstanceOf(HarnessRegistry);
+      expect(registry.list()).toHaveLength(0);
+
+      const service = moduleRef.get<HarnessConversationServiceBinding>(
+        HARNESS_CONVERSATION_SERVICE,
+        {
+          strict: false,
+        },
+      );
+      expect(service).toBe(HARNESS_CONVERSATION_SERVICE_UNAVAILABLE);
+    } finally {
+      await moduleRef.close();
+    }
+  });
+
+  it('pi-rpc mode over the REAL empty registry fails closed at init with the typed adapter-unavailable error', async () => {
+    const moduleRef = await bootChatModule('pi-rpc');
+    try {
+      const err = await initError(moduleRef);
+      expect(err).toBeInstanceOf(ChatRuntimeUnavailableError);
+      expect((err as ChatRuntimeUnavailableError).reason).toBe('adapter_unavailable');
+      expect((err as ChatRuntimeUnavailableError).code).toBe('runtime_unsupported');
+    } finally {
+      await closeIgnoringFailedInit(moduleRef);
+    }
+  });
+
+  it('pi-rpc mode with a pi adapter present but the sentinel conversation service fails closed with the typed conversation-service-unavailable error', async () => {
+    const moduleRef = await bootChatModule('pi-rpc', {
+      registryAdapters: ['pi'],
+      conversationService: HARNESS_CONVERSATION_SERVICE_UNAVAILABLE,
+    });
+    try {
+      const err = await initError(moduleRef);
+      expect(err).toBeInstanceOf(ChatRuntimeUnavailableError);
+      expect((err as ChatRuntimeUnavailableError).reason).toBe('conversation_service_unavailable');
+      expect((err as ChatRuntimeUnavailableError).code).toBe('runtime_unsupported');
+    } finally {
+      await closeIgnoringFailedInit(moduleRef);
+    }
+  });
+
+  it('pi-rpc mode with a pi adapter and a bound conversation service: the actual router selects the harness runtime', async () => {
+    const moduleRef = await bootChatModule('pi-rpc', {
+      registryAdapters: ['pi'],
+      conversationService: boundConversationService,
+    });
+    try {
+      await moduleRef.init();
+      const router = moduleRef.get(ChatRuntimeRouter, { strict: false });
+      expect(router.active.kind).toBe('harness');
+    } finally {
+      await moduleRef.close();
+    }
+  });
+});
+
+/**
+ * Task Five, Step Two — group 2 (WHOLE production `AppModule` boot, legacy end-to-end wiring).
+ *
+ * The groups above bound away the heavy cycle to isolate the router. This group instead boots the
+ * ACTUAL production `AppModule` (the exact graph `main.ts` runs) in the default LEGACY chat-runtime
+ * mode, overriding ONLY the storage/network side-effect adapters so the boot is bounded and offline
+ * — never the chat/router/harness/reload/commands surface under test. The bounded fakes are exactly
+ * the disk/network leaves:
+ *   - `ProviderService` (the #1 hang risk: its real `onModuleInit` starts an unref'd health-check
+ *     `setInterval` and fetches Ollama over HTTP) → inert no-op instance;
+ *   - `DB_HANDLE`/`DB` → a fake Drizzle-shaped handle that satisfies `runPgliteMigrations` (the local
+ *     tier's `DatabaseModule.onModuleInit`) AND `DefaultRoutingRulesSeed.onModuleInit` (which reads a
+ *     system-rule count — the fake reports rules already present so the seed insert is skipped),
+ *     opening no real database;
+ *   - `STORAGE_ADAPTER`/`MEMORY`/`MEMORY_ADAPTER`/`AUTH`/`BRAIN`/`LOG_SERVICE` → inert fakes so no
+ *     storage/auth/log backend is contacted.
+ * Local tier (the repo's `mosaic.config.json`) already disables BullMQ/Redis and the queue handles;
+ * Discord/Telegram/MCP plugins are env-gated and disarmed by deleting their tokens. Nothing about the
+ * router, `ChatModule`, `HarnessModule`, or `ChatGateway` is faked — those come from the REAL graph.
+ *
+ * The boot+init MUST SUCCEED cleanly (proven by `beforeAll` completing and the ChatGateway test
+ * passing). Red-first: on this branch `ChatRuntimeRouter` is registered in NO module (ChatModule
+ * provides only ChatGateway), so `moduleRef.get(ChatRuntimeRouter)` throws `UnknownElementException`
+ * — a WIRING gap, NOT an init failure. That single retrieval is the intended behavioural red; it
+ * flips green once Step Three registers the exclusive router. The ChatGateway retrieval and its
+ * browser-facing method surface are asserted alongside and pass today, pinning that the boot itself
+ * is healthy so the router failure cannot be mistaken for a mis-shaped fake or an unbounded side
+ * effect.
+ */
+describe('AppModule production boot — legacy ChatRuntimeRouter wiring (Task Five, Step Two group 2)', () => {
+  // A Drizzle-shaped fake that satisfies both DB consumers reached during a local-tier init:
+  //   • runPgliteMigrations(): reads handle.db.$client.exec + handle.db.execute(SELECT hashes);
+  //     exec is a no-op and execute yields an empty ledger, so migration statements no-op through.
+  //   • DefaultRoutingRulesSeed.seedDefaultRules(): db.select().from().where() must resolve to a
+  //     row set — we report a non-zero system-rule count so the seeding INSERT branch is skipped.
+  const fakeDb = {
+    $client: { exec: async (): Promise<void> => {} },
+    execute: async (): Promise<{ rows: unknown[] }> => ({ rows: [] }),
+    select: () => ({
+      from: () => ({
+        where: async (): Promise<Array<{ count: number }>> => [{ count: 1 }],
+      }),
+    }),
+    insert: () => ({ values: async (): Promise<void> => {} }),
+  };
+  const fakeDbHandle = { db: fakeDb, close: async (): Promise<void> => {} };
+  const fakeStorageAdapter = {
+    name: 'fake',
+    migrate: async (): Promise<void> => {},
+    close: async (): Promise<void> => {},
+  };
+  // Inert stand-in for the real ProviderService: no health-check interval, no Ollama fetch.
+  const fakeProviderService = {
+    onModuleInit: async (): Promise<void> => {},
+    onModuleDestroy: (): void => {},
+    getRegistry: () => ({
+      getAvailable: () => [],
+      getAll: () => [],
+      find: () => undefined,
+    }),
+    getDefaultModel: () => undefined,
+    listAvailableModels: () => [],
+    listProviders: () => [],
+    getAdapter: () => undefined,
+    getProvidersHealth: () => [],
+  };
+  const fakeBrain = { conversations: {}, agents: {} };
+
+  const BOOT_TIMEOUT_MS = 120_000;
+
+  let moduleRef: TestingModule;
+  let envSnapshot: Record<string, string | undefined>;
+
+  beforeAll(async () => {
+    envSnapshot = { ...process.env };
+    // Env hygiene: disarm the network-facing plugins/adapters and pin the legacy runtime mode.
+    delete process.env['DATABASE_URL'];
+    delete process.env['DISCORD_BOT_TOKEN'];
+    delete process.env['TELEGRAM_BOT_TOKEN'];
+    delete process.env['MCP_SERVERS'];
+    delete process.env['CHAT_HARNESS_RUNTIME']; // resolveChatRuntimeMode → 'legacy'
+    process.env['MOSAIC_STORAGE_TIER'] = 'local';
+
+    moduleRef = await Test.createTestingModule({ imports: [AppModule] })
+      // Storage/network side-effect adapters ONLY — never the router/chat/harness surface under test.
+      .overrideProvider('DB_HANDLE')
+      .useValue(fakeDbHandle)
+      .overrideProvider('DB')
+      .useValue(fakeDb)
+      .overrideProvider('STORAGE_ADAPTER')
+      .useValue(fakeStorageAdapter)
+      .overrideProvider('AUTH')
+      .useValue({})
+      .overrideProvider('BRAIN')
+      .useValue(fakeBrain)
+      .overrideProvider('LOG_SERVICE')
+      .useValue({})
+      .overrideProvider('MEMORY')
+      .useValue({})
+      .overrideProvider('MEMORY_ADAPTER')
+      .useValue({})
+      .overrideProvider(ProviderService)
+      .useValue(fakeProviderService)
+      .compile();
+
+    // The boot itself MUST succeed cleanly — a rejection here is a bounding failure, not the red.
+    await moduleRef.init();
+  }, BOOT_TIMEOUT_MS);
+
+  afterAll(async () => {
+    if (moduleRef) await moduleRef.close();
+    for (const key of Object.keys(process.env)) {
+      if (!(key in envSnapshot)) delete process.env[key];
+    }
+    for (const [key, value] of Object.entries(envSnapshot)) {
+      if (value === undefined) delete process.env[key];
+      else process.env[key] = value;
+    }
+  });
+
+  // Passes TODAY: the real ChatGateway is provided by the real ChatModule and its browser-facing
+  // surface exists. This pins that the whole-AppModule boot came up healthy, so the router failure
+  // below is unambiguously a wiring gap and not a mis-shaped fake or an unbounded side effect.
+  it('boots the whole AppModule and exposes the real ChatGateway with its browser-facing methods', () => {
+    const gateway = moduleRef.get(ChatGateway, { strict: false });
+    expect(typeof gateway.broadcastReload).toBe('function');
+    expect(typeof gateway.getModelOverride).toBe('function');
+    expect(typeof gateway.setModelOverride).toBe('function');
+    expect(typeof gateway.broadcastSessionInfo).toBe('function');
+  });
+
+  // RED TODAY: ChatRuntimeRouter is registered in no module on this branch, so this retrieval throws
+  // UnknownElementException — the intended red-first wiring failure. GREEN once Step Three registers
+  // the exclusive router in the production graph, where legacy mode resolves the embedded runtime.
+  it('resolves the exclusive ChatRuntimeRouter to the embedded runtime in legacy mode', () => {
+    const router = moduleRef.get(ChatRuntimeRouter, { strict: false });
+    expect(router.active.kind).toBe('embedded');
+  });
+});

apps/gateway/src/chat/chat-runtime-router.ts

@@ -0,0 +1,173 @@
+import { Injectable, type OnModuleInit } from '@nestjs/common';
+import { HarnessRegistry } from '../harness/harness.registry.js';
+import {
+  isHarnessConversationServiceAvailable,
+  type HarnessConversationServiceBinding,
+} from '../harness/harness.tokens.js';
+import type {
+  ChatRuntime,
+  ChatRuntimeMode,
+  LegacyBrowserMessagePayload,
+  LegacyEmbeddedChatPort,
+  LegacyRuntimeResult,
+  LegacyRuntimeStream,
+  LegacySessionPresentation,
+  LegacySocketTurnLease,
+  OwnedConversationContext,
+  VerifiedDiscordIngressContext,
+  VerifiedDiscordTurnLease,
+} from './chat-runtime.js';
+import { ChatRuntimeUnavailableError, resolveChatRuntimeMode } from './chat-runtime.js';
+
+/** The fixed fail-closed result for a legacy browser operation issued under `pi-rpc`. */
+const RUNTIME_UNSUPPORTED = {
+  ok: false as const,
+  code: 'runtime_unsupported' as const,
+  retryable: false as const,
+};
+
+/**
+ * Resolves the one live {@link ChatRuntime} for this process and enforces the
+ * `pi-rpc` readiness preconditions at module init — before the gateway accepts
+ * traffic. It never falls back from `pi-rpc` to embedded execution: an unmet
+ * `pi-rpc` precondition is a typed startup failure ({@link ChatRuntimeUnavailableError}),
+ * and until `onModuleInit` selects a runtime, {@link active} throws rather than
+ * exposing any runtime — a failed `pi-rpc` init can never leak the embedded one.
+ */
+@Injectable()
+export class ChatRuntimeRouter implements OnModuleInit, LegacyEmbeddedChatPort {
+  private readonly mode: ChatRuntimeMode;
+
+  /** The single resolved runtime. Undefined until a successful `onModuleInit`. */
+  private resolved: ChatRuntime | undefined;
+
+  constructor(
+    private readonly harnessRegistry: HarnessRegistry,
+    private readonly conversationService: HarnessConversationServiceBinding,
+    private readonly embedded: ChatRuntime,
+    private readonly harness: ChatRuntime,
+    mode: ChatRuntimeMode = resolveChatRuntimeMode(),
+  ) {
+    this.mode = mode;
+  }
+
+  onModuleInit(): void {
+    if (this.mode === 'legacy') {
+      // Legacy ignores the pi-rpc preconditions entirely and always runs embedded.
+      this.resolved = this.embedded;
+      return;
+    }
+
+    // pi-rpc: both preconditions are hard startup failures, checked in a fixed order.
+    if (!this.harnessRegistry.has('pi')) {
+      this.resolved = undefined;
+      throw new ChatRuntimeUnavailableError('adapter_unavailable');
+    }
+    if (!isHarnessConversationServiceAvailable(this.conversationService)) {
+      this.resolved = undefined;
+      throw new ChatRuntimeUnavailableError('conversation_service_unavailable');
+    }
+
+    this.resolved = this.harness;
+  }
+
+  get active(): ChatRuntime {
+    if (this.resolved === undefined) {
+      // Reached only if init has not run or failed closed; never expose a runtime here.
+      throw new Error('The chat runtime is not available: startup did not resolve a runtime.');
+    }
+    return this.resolved;
+  }
+
+  /**
+   * The process-wide mode, available before {@link onModuleInit}. Production handlers read
+   * this to fail a legacy browser turn closed under `pi-rpc` *before* parsing the payload as
+   * either browser-legacy input or a Discord envelope — never to branch into a fallback.
+   */
+  get runtimeMode(): ChatRuntimeMode {
+    return this.mode;
+  }
+
+  /**
+   * The embedded runtime narrowed to its port. Only reached on the legacy path (and for the
+   * verified-Discord op in both modes), where the injected runtime is always a real
+   * `EmbeddedChatRuntime`. The router spec constructs the router with a bare `{ kind }` stub
+   * but never invokes a port op, so this narrowing is never exercised against the stub.
+   */
+  private get embeddedPort(): LegacyEmbeddedChatPort {
+    return this.embedded as unknown as LegacyEmbeddedChatPort;
+  }
+
+  // --- LegacyEmbeddedChatPort: legacy browser operations fail closed under pi-rpc ---
+
+  completeLegacyRestTurn(
+    context: OwnedConversationContext,
+    input: Readonly<{ content: string }>,
+  ): Promise<
+    LegacyRuntimeResult<Readonly<{ text: string; presentation: LegacySessionPresentation }>>
+  > {
+    if (this.mode === 'pi-rpc') {
+      return Promise.resolve(RUNTIME_UNSUPPORTED);
+    }
+    return this.embeddedPort.completeLegacyRestTurn(context, input);
+  }
+
+  prepareLegacySocketTurn(
+    context: OwnedConversationContext,
+    input: LegacyBrowserMessagePayload,
+    stream: LegacyRuntimeStream,
+  ): Promise<LegacyRuntimeResult<LegacySocketTurnLease>> {
+    if (this.mode === 'pi-rpc') {
+      return Promise.resolve(RUNTIME_UNSUPPORTED);
+    }
+    return this.embeddedPort.prepareLegacySocketTurn(context, input, stream);
+  }
+
+  setLegacyThinking(
+    context: OwnedConversationContext,
+    level: string,
+  ): LegacyRuntimeResult<LegacySessionPresentation> {
+    if (this.mode === 'pi-rpc') {
+      return RUNTIME_UNSUPPORTED;
+    }
+    return this.embeddedPort.setLegacyThinking(context, level);
+  }
+
+  abortLegacyTurn(context: OwnedConversationContext): Promise<LegacyRuntimeResult<void>> {
+    if (this.mode === 'pi-rpc') {
+      return Promise.resolve(RUNTIME_UNSUPPORTED);
+    }
+    return this.embeddedPort.abortLegacyTurn(context);
+  }
+
+  applyLegacyModelOverride(
+    context: OwnedConversationContext,
+    modelId: string,
+  ): LegacyRuntimeResult<LegacySessionPresentation> {
+    if (this.mode === 'pi-rpc') {
+      return RUNTIME_UNSUPPORTED;
+    }
+    return this.embeddedPort.applyLegacyModelOverride(context, modelId);
+  }
+
+  readLegacySessionPresentation(
+    context: OwnedConversationContext,
+  ): LegacyRuntimeResult<LegacySessionPresentation> {
+    if (this.mode === 'pi-rpc') {
+      return RUNTIME_UNSUPPORTED;
+    }
+    return this.embeddedPort.readLegacySessionPresentation(context);
+  }
+
+  /**
+   * Verified Discord ingress bypasses browser mode: it is embedded-only in BOTH modes and
+   * never reaches the harness or routing-engine selection. It is reached only through a
+   * {@link VerifiedDiscordIngressContext}, which exists only after every ingress check.
+   */
+  dispatchVerifiedDiscordIngress(
+    context: VerifiedDiscordIngressContext,
+    stream: LegacyRuntimeStream,
+  ): Promise<LegacyRuntimeResult<VerifiedDiscordTurnLease>> {
+    return this.embeddedPort.dispatchVerifiedDiscordIngress(context, stream);
+  }
+}

apps/gateway/src/chat/chat-runtime.ts

@@ -0,0 +1,273 @@
+import type { ChannelAttachmentDto, RoutingDecisionInfo } from '@mosaicstack/types';
+
+/**
+ * The single chat execution strategy resolved by {@link ChatRuntimeRouter}.
+ *
+ * Exactly one runtime is live per process. There is no union that lets a
+ * `pi-rpc` deployment silently fall back to embedded execution: an unmet
+ * `pi-rpc` precondition is a typed startup failure, never a downgrade.
+ */
+export type ChatRuntimeMode = 'legacy' | 'pi-rpc';
+
+export type ChatRuntimeKind = 'embedded' | 'harness';
+
+/** The resolved runtime. Slice Zero exposes only its immutable {@link ChatRuntimeKind}. */
+export interface ChatRuntime {
+  readonly kind: ChatRuntimeKind;
+}
+
+/** Why the `pi-rpc` runtime could not be made ready. Both are hard startup failures. */
+export type ChatRuntimeUnavailableReason =
+  | 'adapter_unavailable'
+  | 'conversation_service_unavailable';
+
+/**
+ * Raised at module init when `pi-rpc` mode is selected but its preconditions are
+ * unmet. Carries only fixed, browser-safe text — never a raw exception message,
+ * stack, or provider detail — and reports the frozen ack code `runtime_unsupported`.
+ */
+export class ChatRuntimeUnavailableError extends Error {
+  readonly code = 'runtime_unsupported' as const;
+  readonly reason: ChatRuntimeUnavailableReason;
+
+  constructor(reason: ChatRuntimeUnavailableReason) {
+    super(
+      reason === 'adapter_unavailable'
+        ? 'The pi-rpc chat runtime is unavailable: no "pi" harness adapter is registered.'
+        : 'The pi-rpc chat runtime is unavailable: the harness conversation service is not bound.',
+    );
+    this.name = 'ChatRuntimeUnavailableError';
+    this.reason = reason;
+  }
+}
+
+/**
+ * Resolves the process-wide chat runtime mode from the environment. Anything other
+ * than the exact opt-in token `pi-rpc` keeps the legacy embedded runtime.
+ */
+export function resolveChatRuntimeMode(
+  env: Record<string, string | undefined> = process.env,
+): ChatRuntimeMode {
+  return env['CHAT_HARNESS_RUNTIME'] === 'pi-rpc' ? 'pi-rpc' : 'legacy';
+}
+
+// ---------------------------------------------------------------------------
+// Transitional embedded chat port (Task Five).
+//
+// The legacy embedded browser behaviour is moved behind this exact interface so
+// neither the controller nor the gateway retains AgentService, RoutingEngine,
+// session, `piSession`, metric, listener, or channel access. `EmbeddedChatRuntime`
+// implements the port; `ChatRuntimeRouter` exposes the same narrowly named
+// operations and returns `runtime_unsupported` before touching Embedded for legacy
+// browser operations when the mode is `pi-rpc`.
+//
+// The names are frozen (spec jarvis-brain@1c629b06). Legacy REST completion,
+// legacy Socket streaming, P3 harness turns, and verified Discord are distinct
+// transport/trust capabilities — there is deliberately no generic
+// `sendConversationTurn` nor an AgentService-shaped mirror on the router.
+// ---------------------------------------------------------------------------
+
+/**
+ * Phantom brand keeping {@link OwnedConversationContext} nominally distinct so browser
+ * DTOs are never structurally assignable to it. The factory that mints one may be called
+ * only after authentication with `scopeFromUser(...)`, never with payload authority fields.
+ */
+declare const ownedConversationContextBrand: unique symbol;
+
+/** Gateway-only ownership context. Embedded rechecks owner+tenant on every operation. */
+export interface OwnedConversationContext {
+  readonly [ownedConversationContextBrand]: true;
+  readonly conversationId: string;
+  readonly scope: Readonly<{ userId: string; tenantId: string }>;
+}
+
+/**
+ * Every non-`ok` legacy runtime outcome. Missing, foreign, and no-longer-owned
+ * conversations all collapse to `conversation_unavailable`. Ownership/mode/validation
+ * failures are total results and never throw.
+ */
+export type LegacyRuntimeFailure =
+  | { readonly ok: false; readonly code: 'runtime_unsupported'; readonly retryable: false }
+  | { readonly ok: false; readonly code: 'conversation_unavailable'; readonly retryable: false }
+  | { readonly ok: false; readonly code: 'request_invalid'; readonly retryable: false }
+  | {
+      readonly ok: false;
+      readonly code: 'thinking_level_invalid';
+      readonly retryable: false;
+      readonly availableThinkingLevels: readonly string[];
+    }
+  | { readonly ok: false; readonly code: 'runtime_unavailable'; readonly retryable: true }
+  | { readonly ok: false; readonly code: 'turn_already_dispatched'; readonly retryable: false }
+  | { readonly ok: false; readonly code: 'operation_failed'; readonly retryable: boolean }
+  | { readonly ok: false; readonly code: 'timeout'; readonly retryable: true };
+
+/** Total result: an `ok` value or one of the fixed {@link LegacyRuntimeFailure} codes. */
+export type LegacyRuntimeResult<T> =
+  | { readonly ok: true; readonly value: T }
+  | LegacyRuntimeFailure;
+
+/** User-facing session projection. Carries no session object, handle, or credential path. */
+export interface LegacySessionPresentation {
+  readonly provider: string;
+  readonly modelId: string;
+  readonly thinkingLevel: string;
+  readonly availableThinkingLevels: readonly string[];
+  readonly agentName?: string;
+  readonly routingDecision?: RoutingDecisionInfo;
+}
+
+/** Terminal usage stats, normalized by Embedded from AgentService metrics. */
+export interface LegacyUsage {
+  readonly provider: string;
+  readonly modelId: string;
+  readonly thinkingLevel: string;
+  readonly tokens: Readonly<{
+    input: number;
+    output: number;
+    cacheRead: number;
+    cacheWrite: number;
+    total: number;
+  }>;
+  readonly cost: number;
+  readonly context: Readonly<{ percent: number | null; window: number }>;
+}
+
+/**
+ * Normalized stream event. Exposes no `AgentSession`, `piSession`, native handle, raw
+ * exception, tool arguments, or credential-bearing path — the gateway sees only these.
+ */
+export type LegacyRuntimeEvent =
+  | { readonly type: 'started' }
+  | { readonly type: 'text_delta'; readonly text: string }
+  | { readonly type: 'thinking_delta'; readonly text: string }
+  | {
+      readonly type: 'tool_started';
+      readonly toolCallId: string;
+      readonly toolName: string;
+    }
+  | {
+      readonly type: 'tool_finished';
+      readonly toolCallId: string;
+      readonly toolName: string;
+      readonly isError: boolean;
+    }
+  | { readonly type: 'settled'; readonly usage?: LegacyUsage };
+
+/** Legacy browser message input. Authority fields are advisory only; scope comes from the context. */
+export interface LegacyBrowserMessagePayload {
+  readonly content: string;
+  readonly provider?: string;
+  readonly modelId?: string;
+  readonly agentId?: string;
+  readonly attachments?: readonly ChannelAttachmentDto[];
+}
+
+/** A prepared-but-not-yet-dispatched legacy socket turn. */
+export interface LegacySocketTurnLease {
+  readonly presentation: LegacySessionPresentation;
+  /**
+   * Atomically one-shot and scope-rechecking. A second call returns
+   * `turn_already_dispatched` and performs zero prompt/tool effects.
+   */
+  dispatch(): Promise<LegacyRuntimeResult<void>>;
+  /** Idempotent, non-throwing. Removes listener and channel, including partial setup. */
+  dispose(): Promise<void>;
+}
+
+/**
+ * Phantom brand for {@link VerifiedDiscordIngressContext}. Minted only after service-token
+ * auth plus signature, allowlist, binding, expected-route, replay, configured-agent,
+ * forced-scope, and attachment-normalization checks.
+ */
+declare const verifiedDiscordIngressContextBrand: unique symbol;
+
+/** Fully-verified Discord ingress. Contains no socket, envelope, signature, token, or escape hatch. */
+export interface VerifiedDiscordIngressContext {
+  readonly [verifiedDiscordIngressContextBrand]: true;
+  readonly conversationId: string;
+  readonly scope: Readonly<{ userId: string; tenantId: string }>;
+  readonly configuredAgent: Readonly<{ agentConfigId: string; instanceId: string }>;
+  readonly content: string;
+  readonly attachments?: readonly ChannelAttachmentDto[];
+  readonly correlationId: string;
+  readonly discordMessageId: string;
+  readonly discordUserId: string;
+}
+
+/** Verified-Discord turn lease. Same atomic one-shot dispatch and idempotent dispose rules. */
+export interface VerifiedDiscordTurnLease {
+  readonly presentation: LegacySessionPresentation;
+  dispatch(): Promise<LegacyRuntimeResult<void>>;
+  dispose(): Promise<void>;
+}
+
+/** Server-owned egress projection the runtime pushes normalized events into. */
+export interface LegacyRuntimeStream {
+  /** Server-derived, e.g. `websocket:<socket-id>`. Never client-supplied. */
+  readonly channelId: string;
+  onEvent(event: LegacyRuntimeEvent): void;
+}
+
+/**
+ * The exact transitional port. `EmbeddedChatRuntime` implements it; `ChatRuntimeRouter`
+ * mirrors the operation names and fails closed with `runtime_unsupported` for legacy
+ * browser operations under `pi-rpc`.
+ */
+export interface LegacyEmbeddedChatPort {
+  completeLegacyRestTurn(
+    context: OwnedConversationContext,
+    input: Readonly<{ content: string }>,
+  ): Promise<
+    LegacyRuntimeResult<Readonly<{ text: string; presentation: LegacySessionPresentation }>>
+  >;
+
+  prepareLegacySocketTurn(
+    context: OwnedConversationContext,
+    input: LegacyBrowserMessagePayload,
+    stream: LegacyRuntimeStream,
+  ): Promise<LegacyRuntimeResult<LegacySocketTurnLease>>;
+
+  setLegacyThinking(
+    context: OwnedConversationContext,
+    level: string,
+  ): LegacyRuntimeResult<LegacySessionPresentation>;
+
+  abortLegacyTurn(context: OwnedConversationContext): Promise<LegacyRuntimeResult<void>>;
+
+  applyLegacyModelOverride(
+    context: OwnedConversationContext,
+    modelId: string,
+  ): LegacyRuntimeResult<LegacySessionPresentation>;
+
+  readLegacySessionPresentation(
+    context: OwnedConversationContext,
+  ): LegacyRuntimeResult<LegacySessionPresentation>;
+
+  dispatchVerifiedDiscordIngress(
+    context: VerifiedDiscordIngressContext,
+    stream: LegacyRuntimeStream,
+  ): Promise<LegacyRuntimeResult<VerifiedDiscordTurnLease>>;
+}
+
+/**
+ * Mints an {@link OwnedConversationContext} from a server-derived scope. Callers must pass
+ * a scope produced by `scopeFromUser(...)` after authentication — never a client-supplied
+ * authority field. The brand is phantom, so this is the only way to obtain the branded type.
+ */
+export function ownConversation(
+  conversationId: string,
+  scope: Readonly<{ userId: string; tenantId: string }>,
+): OwnedConversationContext {
+  return { conversationId, scope } as unknown as OwnedConversationContext;
+}
+
+/**
+ * Mints a {@link VerifiedDiscordIngressContext}. Callers must have already completed every
+ * ingress check (service-token auth, signature, allowlist, binding, expected-route, replay,
+ * configured-agent, forced-scope, attachment normalization) before calling this.
+ */
+export function verifyDiscordIngress(
+  fields: Omit<VerifiedDiscordIngressContext, typeof verifiedDiscordIngressContextBrand>,
+): VerifiedDiscordIngressContext {
+  return { ...fields } as unknown as VerifiedDiscordIngressContext;
+}

apps/gateway/src/chat/chat.controller.ts

@@ -5,16 +5,18 @@ import {
   Logger,
   HttpException,
   HttpStatus,
-  Inject,
+  NotFoundException,
   UseGuards,
 } from '@nestjs/common';
-import type { AgentSessionEvent } from '@mariozechner/pi-coding-agent';
 import { Throttle } from '@nestjs/throttler';
-import { AgentService } from '../agent/agent.service.js';
 import { AuthGuard } from '../auth/auth.guard.js';
 import { CurrentUser } from '../auth/current-user.decorator.js';
+import { scopeFromUser, type AuthenticatedUserLike } from '../auth/session-scope.js';
 import { v4 as uuid } from 'uuid';
 import { ChatRequestDto } from './chat.dto.js';
+import { ChatRuntimeRouter } from './chat-runtime-router.js';
+import { ownConversation } from './chat-runtime.js';
+import type { LegacyRuntimeFailure } from './chat-runtime.js';
 
 interface ChatResponse {
   conversationId: string;
@@ -26,65 +28,49 @@ interface ChatResponse {
 export class ChatController {
   private readonly logger = new Logger(ChatController.name);
 
-  constructor(@Inject(AgentService) private readonly agentService: AgentService) {}
+  constructor(private readonly runtime: ChatRuntimeRouter) {}
 
   @Post()
   @Throttle({ default: { limit: 10, ttl: 60_000 } })
   async chat(
     @Body() body: ChatRequestDto,
-    @CurrentUser() user: { id: string },
+    @CurrentUser() user: AuthenticatedUserLike,
   ): Promise<ChatResponse> {
     const conversationId = body.conversationId ?? uuid();
-
-    try {
-      let agentSession = this.agentService.getSession(conversationId);
-      if (!agentSession) {
-        agentSession = await this.agentService.createSession(conversationId);
-      }
-    } catch (err) {
-      this.logger.error(
-        `Session creation failed for conversation=${conversationId}`,
-        err instanceof Error ? err.stack : String(err),
-      );
-      throw new HttpException('Agent session unavailable', HttpStatus.SERVICE_UNAVAILABLE);
-    }
+    const scope = scopeFromUser(user);
 
     this.logger.debug(`Handling chat request for user=${user.id}, conversation=${conversationId}`);
 
-    let responseText = '';
+    // The one exclusive runtime owns execution. In legacy mode this reaches the embedded runtime;
+    // in pi-rpc it fails closed with `runtime_unsupported` before ever touching embedded execution.
+    const result = await this.runtime.completeLegacyRestTurn(
+      ownConversation(conversationId, scope),
+      { content: body.content },
+    );
 
-    const done = new Promise<void>((resolve, reject) => {
-      const timer = setTimeout(() => {
-        cleanup();
-        this.logger.error(`Agent response timed out after 120s for conversation=${conversationId}`);
-        reject(new Error('Agent response timed out'));
-      }, 120_000);
-
-      const cleanup = this.agentService.onEvent(conversationId, (event: AgentSessionEvent) => {
-        if (event.type === 'message_update' && event.assistantMessageEvent.type === 'text_delta') {
-          responseText += event.assistantMessageEvent.delta;
-        }
-        if (event.type === 'agent_end') {
-          clearTimeout(timer);
-          cleanup();
-          resolve();
-        }
-      });
-    });
-
-    try {
-      await this.agentService.prompt(conversationId, body.content);
-      await done;
-    } catch (err) {
-      if (err instanceof HttpException) throw err;
-      const message = err instanceof Error ? err.message : String(err);
-      if (message.includes('timed out')) {
-        throw new HttpException('Agent response timed out', HttpStatus.GATEWAY_TIMEOUT);
-      }
-      this.logger.error(`Chat prompt failed for conversation=${conversationId}`, String(err));
-      throw new HttpException('Agent processing failed', HttpStatus.INTERNAL_SERVER_ERROR);
+    if (result.ok) {
+      return { conversationId, text: result.value.text };
     }
 
-    return { conversationId, text: responseText };
+    throw this.toHttpException(result, conversationId);
+  }
+
+  /** Maps a total {@link LegacyRuntimeFailure} to the fixed browser-safe HTTP surface. */
+  private toHttpException(failure: LegacyRuntimeFailure, conversationId: string): HttpException {
+    switch (failure.code) {
+      case 'conversation_unavailable':
+        return new NotFoundException('Session not found');
+      case 'request_invalid':
+      case 'thinking_level_invalid':
+        return new HttpException('Invalid chat request', HttpStatus.BAD_REQUEST);
+      case 'timeout':
+        return new HttpException('Agent response timed out', HttpStatus.GATEWAY_TIMEOUT);
+      case 'runtime_unsupported':
+      case 'runtime_unavailable':
+        return new HttpException('Agent runtime unavailable', HttpStatus.SERVICE_UNAVAILABLE);
+      default:
+        this.logger.error(`Chat turn failed for conversation=${conversationId}: ${failure.code}`);
+        return new HttpException('Agent processing failed', HttpStatus.INTERNAL_SERVER_ERROR);
+    }
   }
 }

apps/gateway/src/chat/chat.dto.ts

@@ -1,4 +1,14 @@
-import { IsOptional, IsString, IsUUID, MaxLength } from 'class-validator';
+import type { ChannelAttachmentDto } from '@mosaicstack/types';
+import { Transform, Type } from 'class-transformer';
+import {
+  IsNotEmpty,
+  IsObject,
+  IsOptional,
+  IsString,
+  IsUUID,
+  MaxLength,
+  ValidateNested,
+} from 'class-validator';
 
 export class ChatRequestDto {
   @IsOptional()
@@ -32,4 +42,60 @@ export class ChatSocketMessageDto {
   @IsOptional()
   @IsUUID()
   agentId?: string;
+
+  /** Validated channel attachment references; binary content is not embedded. */
+  attachments?: readonly ChannelAttachmentDto[];
+}
+
+/**
+ * Task Five, group 2 — the frozen pi-rpc `turn:send` selection triple.
+ *
+ * Each id is a required, non-empty, bounded string. There is no `@IsOptional` and no extra
+ * field: under `forbidNonWhitelisted` an unknown selection key is rejected, and a missing id
+ * fails `@IsString` (undefined is not a string) rather than silently passing.
+ */
+export class HarnessTurnSelectionDto {
+  @IsString()
+  @IsNotEmpty()
+  @MaxLength(255)
+  harnessId!: string;
+
+  @IsString()
+  @IsNotEmpty()
+  @MaxLength(255)
+  providerId!: string;
+
+  @IsString()
+  @IsNotEmpty()
+  @MaxLength(255)
+  modelId!: string;
+}
+
+/**
+ * Task Five, group 2 — the frozen wire contract for a pi-rpc `turn:send`.
+ *
+ * Validated through the production `ValidationPipe({ whitelist, forbidNonWhitelisted, transform })`:
+ * a UUID conversation id; `content` trimmed then bounded to 1..10_000 characters (whitespace-only
+ * collapses to empty and fails `@IsNotEmpty`); a nested `selection` object recursed with an
+ * explicit `@Type` (a bare `@ValidateNested` is masked green by class-validator's empty-metadata
+ * `unknownValue`); and a UUID-v4 idempotency key. No `provider`/`modelId`/`attachments` or other
+ * authority field is declared, so `forbidNonWhitelisted` rejects every unknown top-level key.
+ */
+export class HarnessTurnSendDto {
+  @IsUUID()
+  conversationId!: string;
+
+  @Transform(({ value }) => (typeof value === 'string' ? value.trim() : value))
+  @IsString()
+  @IsNotEmpty()
+  @MaxLength(10_000)
+  content!: string;
+
+  @IsObject()
+  @ValidateNested()
+  @Type(() => HarnessTurnSelectionDto)
+  selection!: HarnessTurnSelectionDto;
+
+  @IsUUID('4')
+  idempotencyKey!: string;
 }

apps/gateway/src/chat/chat.gateway-auth.ts

@@ -1,3 +1,4 @@
+import { timingSafeEqual } from 'node:crypto';
 import type { IncomingHttpHeaders } from 'node:http';
 import { fromNodeHeaders } from 'better-auth/node';
 
@@ -12,6 +13,19 @@ export interface SessionAuth {
   };
 }
 
+export function validateDiscordServiceToken(
+  candidate: unknown,
+  expected: string | undefined,
+): boolean {
+  if (typeof candidate !== 'string' || !expected) return false;
+  const candidateBuffer = Buffer.from(candidate);
+  const expectedBuffer = Buffer.from(expected);
+  return (
+    candidateBuffer.length === expectedBuffer.length &&
+    timingSafeEqual(candidateBuffer, expectedBuffer)
+  );
+}
+
 export async function validateSocketSession(
   headers: IncomingHttpHeaders,
   auth: SessionAuth,

apps/gateway/src/chat/chat.gateway-command-approval.spec.ts

@@ -0,0 +1,204 @@
+import { describe, expect, it, vi } from 'vitest';
+import type { SlashCommandPayload } from '@mosaicstack/types';
+import { ChatGateway } from './chat.gateway.js';
+
+const payload: SlashCommandPayload = {
+  command: 'gc',
+  conversationId: 'conversation-1',
+  approvalId: 'approval-1',
+};
+
+/**
+ * Task 5 fence (F, existing control): gateway-owned command authorization/approval must
+ * cause ZERO chat-runtime dispatch. Placed in the gateway's chat-runtime-router slot (the
+ * former direct `AgentService` slot) so any accidental chat-runtime resolution throws
+ * loudly instead of silently passing. Because execute/approval run entirely through the
+ * command executor dependency and never resolve a chat runtime, this fixture is never
+ * triggered and the ingress stays a GREEN control.
+ */
+function failIfUsedChatRuntimeRouter() {
+  return {
+    onModuleInit: () => {
+      throw new Error('chat runtime router must not initialise on the command approval path');
+    },
+    get active(): never {
+      throw new Error('chat runtime must not be resolved on the command approval path');
+    },
+  };
+}
+
+function buildGateway(commandExecutor: {
+  execute: ReturnType<typeof vi.fn>;
+  createApproval: ReturnType<typeof vi.fn>;
+}): ChatGateway {
+  return new ChatGateway(
+    failIfUsedChatRuntimeRouter() as never,
+    {} as never,
+    {} as never,
+    {} as never,
+    commandExecutor as never,
+    {} as never,
+  );
+}
+
+describe('ChatGateway command approval ingress', () => {
+  it('passes the client approval ID through to command execution while deriving the actor server-side', async (): Promise<void> => {
+    const commandExecutor = {
+      execute: vi.fn().mockResolvedValue({ ...payload, success: true }),
+      createApproval: vi.fn(),
+    };
+    const gateway = buildGateway(commandExecutor);
+    const client = { data: { user: { id: 'admin-1' } }, emit: vi.fn() };
+
+    await gateway.handleCommandExecute(client as never, payload);
+
+    expect(commandExecutor.execute).toHaveBeenCalledWith(payload, {
+      userId: 'admin-1',
+      tenantId: 'admin-1',
+    });
+    expect(client.emit).toHaveBeenCalledWith(
+      'command:result',
+      expect.objectContaining({ success: true }),
+    );
+  });
+
+  it('issues a durable approval only for the authenticated actor', async (): Promise<void> => {
+    const commandExecutor = {
+      execute: vi.fn(),
+      createApproval: vi.fn().mockResolvedValue({
+        approvalId: 'approval-1',
+        expiresAt: '2026-07-12T00:05:00.000Z',
+      }),
+    };
+    const gateway = buildGateway(commandExecutor);
+    const client = { data: { user: { id: 'admin-1' } }, emit: vi.fn() };
+
+    await gateway.handleCommandApproval(client as never, {
+      command: 'gc',
+      conversationId: 'conversation-1',
+    });
+
+    expect(commandExecutor.createApproval).toHaveBeenCalledWith(
+      { command: 'gc', conversationId: 'conversation-1' },
+      { userId: 'admin-1', tenantId: 'admin-1' },
+    );
+    expect(client.emit).toHaveBeenCalledWith('command:approval', {
+      command: 'gc',
+      conversationId: 'conversation-1',
+      success: true,
+      approvalId: 'approval-1',
+      expiresAt: '2026-07-12T00:05:00.000Z',
+    });
+  });
+});
+
+/**
+ * Task 5 (G3) command runtime fence. Under pi-rpc there is no embedded chat session, so
+ * embedded slash-commands (/model, /agent, and every other non-audited command) are fixed
+ * "unsupported" and MUST fail closed BEFORE reaching the command executor — never a silent
+ * fall-through to embedded execution. Only runtime-independent audited system commands
+ * (/reload) pass through as a positive control, and the approval path stays runtime-independent.
+ * The router stub here carries `runtimeMode: 'pi-rpc'` and throws if any runtime is resolved, so
+ * a fence bypass surfaces as a thrown error rather than a silent embedded dispatch.
+ */
+function buildPiRpcGateway(commandExecutor: {
+  execute: ReturnType<typeof vi.fn>;
+  createApproval: ReturnType<typeof vi.fn>;
+}): ChatGateway {
+  const piRpcRouter = {
+    runtimeMode: 'pi-rpc' as const,
+    onModuleInit: () => {
+      throw new Error('chat runtime router must not initialise on the pi-rpc command path');
+    },
+    get active(): never {
+      throw new Error('chat runtime must not be resolved on the pi-rpc command path');
+    },
+  };
+  return new ChatGateway(
+    piRpcRouter as never,
+    {} as never,
+    {} as never,
+    {} as never,
+    commandExecutor as never,
+    {} as never,
+  );
+}
+
+describe('ChatGateway command runtime fence (Task 5 G3, pi-rpc)', () => {
+  const UNSUPPORTED = 'Slash commands are not available on this deployment.';
+
+  it.each(['model', 'agent', 'gc'])(
+    'fails /%s closed before the executor under pi-rpc (execute never called)',
+    async (command): Promise<void> => {
+      const commandExecutor = {
+        execute: vi
+          .fn()
+          .mockResolvedValue({ command, conversationId: 'conversation-1', success: true }),
+        createApproval: vi.fn(),
+      };
+      const gateway = buildPiRpcGateway(commandExecutor);
+      const client = { data: { user: { id: 'admin-1' } }, emit: vi.fn() };
+
+      await gateway.handleCommandExecute(client as never, {
+        command,
+        conversationId: 'conversation-1',
+      });
+
+      expect(commandExecutor.execute).toHaveBeenCalledTimes(0);
+      expect(client.emit).toHaveBeenCalledWith('command:result', {
+        command,
+        conversationId: 'conversation-1',
+        success: false,
+        message: UNSUPPORTED,
+      });
+    },
+  );
+
+  it('passes the audited /reload system command through as a positive control under pi-rpc', async (): Promise<void> => {
+    const reloadResult = { command: 'reload', conversationId: 'conversation-1', success: true };
+    const commandExecutor = {
+      execute: vi.fn().mockResolvedValue(reloadResult),
+      createApproval: vi.fn(),
+    };
+    const gateway = buildPiRpcGateway(commandExecutor);
+    const client = { data: { user: { id: 'admin-1' } }, emit: vi.fn() };
+
+    await gateway.handleCommandExecute(client as never, {
+      command: 'reload',
+      conversationId: 'conversation-1',
+    });
+
+    expect(commandExecutor.execute).toHaveBeenCalledTimes(1);
+    expect(commandExecutor.execute).toHaveBeenCalledWith(
+      { command: 'reload', conversationId: 'conversation-1' },
+      { userId: 'admin-1', tenantId: 'admin-1' },
+    );
+    expect(client.emit).toHaveBeenCalledWith('command:result', reloadResult);
+  });
+
+  it('keeps command approval runtime-independent under pi-rpc (createApproval still runs)', async (): Promise<void> => {
+    const commandExecutor = {
+      execute: vi.fn(),
+      createApproval: vi.fn().mockResolvedValue({
+        approvalId: 'approval-1',
+        expiresAt: '2026-07-12T00:05:00.000Z',
+      }),
+    };
+    const gateway = buildPiRpcGateway(commandExecutor);
+    const client = { data: { user: { id: 'admin-1' } }, emit: vi.fn() };
+
+    await gateway.handleCommandApproval(client as never, {
+      command: 'gc',
+      conversationId: 'conversation-1',
+    });
+
+    expect(commandExecutor.createApproval).toHaveBeenCalledWith(
+      { command: 'gc', conversationId: 'conversation-1' },
+      { userId: 'admin-1', tenantId: 'admin-1' },
+    );
+    expect(client.emit).toHaveBeenCalledWith(
+      'command:approval',
+      expect.objectContaining({ success: true, approvalId: 'approval-1' }),
+    );
+  });
+});

apps/gateway/src/chat/chat.module.ts

@@ -1,12 +1,59 @@
 import { forwardRef, Module } from '@nestjs/common';
 import { CommandsModule } from '../commands/commands.module.js';
+import { HarnessModule } from '../harness/harness.module.js';
+import { HarnessRegistry } from '../harness/harness.registry.js';
+import {
+  HARNESS_CONVERSATION_SERVICE,
+  HARNESS_REGISTRY,
+  type HarnessConversationServiceBinding,
+} from '../harness/harness.tokens.js';
+import type { HarnessConversationService } from '@mosaicstack/types';
 import { ChatGateway } from './chat.gateway.js';
 import { ChatController } from './chat.controller.js';
+import { ChatRuntimeRouter } from './chat-runtime-router.js';
+import { EmbeddedChatRuntime } from './embedded-chat.runtime.js';
+import { HarnessChatRuntime } from './harness-chat.runtime.js';
 
+/**
+ * Task Five wiring. The exclusive {@link ChatRuntimeRouter} is the single chat-execution
+ * authority: the controller and gateway inject only the router, never `AgentService`,
+ * `RoutingEngineService`, or a session/`piSession` handle. The router resolves exactly one
+ * runtime at module init — {@link EmbeddedChatRuntime} in legacy mode, {@link HarnessChatRuntime}
+ * in `pi-rpc` — over the REAL {@link HarnessModule} registry and conversation-service binding.
+ *
+ * The router and the harness runtime are constructed through factories because their
+ * dependencies are interface/union types with no runtime injection token (the registry and
+ * conversation-service arrive via the string tokens exported by `HarnessModule`); the embedded
+ * runtime injects the class-typed `AgentService` and is provided directly.
+ */
 @Module({
-  imports: [forwardRef(() => CommandsModule)],
+  imports: [forwardRef(() => CommandsModule), HarnessModule],
   controllers: [ChatController],
-  providers: [ChatGateway],
-  exports: [ChatGateway],
+  providers: [
+    ChatGateway,
+    EmbeddedChatRuntime,
+    {
+      provide: HarnessChatRuntime,
+      useFactory: (conversationService: HarnessConversationServiceBinding) =>
+        new HarnessChatRuntime(conversationService as HarnessConversationService),
+      inject: [HARNESS_CONVERSATION_SERVICE],
+    },
+    {
+      provide: ChatRuntimeRouter,
+      useFactory: (
+        registry: HarnessRegistry,
+        conversationService: HarnessConversationServiceBinding,
+        embedded: EmbeddedChatRuntime,
+        harness: HarnessChatRuntime,
+      ) => new ChatRuntimeRouter(registry, conversationService, embedded, harness),
+      inject: [
+        HARNESS_REGISTRY,
+        HARNESS_CONVERSATION_SERVICE,
+        EmbeddedChatRuntime,
+        HarnessChatRuntime,
+      ],
+    },
+  ],
+  exports: [ChatGateway, ChatRuntimeRouter],
 })
 export class ChatModule {}

apps/gateway/src/chat/embedded-chat.runtime.ts

@@ -0,0 +1,482 @@
+import { ForbiddenException, Injectable, Logger, NotFoundException } from '@nestjs/common';
+import type { AgentSessionEvent } from '@mariozechner/pi-coding-agent';
+import { AgentService, type AgentSession } from '../agent/agent.service.js';
+import type { ActorTenantScope } from '../auth/session-scope.js';
+import type {
+  ChatRuntime,
+  LegacyBrowserMessagePayload,
+  LegacyEmbeddedChatPort,
+  LegacyRuntimeEvent,
+  LegacyRuntimeResult,
+  LegacySessionPresentation,
+  LegacySocketTurnLease,
+  LegacyUsage,
+  OwnedConversationContext,
+  VerifiedDiscordIngressContext,
+  VerifiedDiscordTurnLease,
+  LegacyRuntimeStream,
+} from './chat-runtime.js';
+
+/** Fixed timeout for a synchronous REST turn, matching the historical controller budget. */
+const REST_TURN_TIMEOUT_MS = 120_000;
+
+/**
+ * The `legacy` chat runtime and the sole implementation of {@link LegacyEmbeddedChatPort}.
+ *
+ * It owns the embedded in-process execution path — the `AgentService` stack that the
+ * `ChatController` and `ChatGateway` drove directly before Task Five. Once the
+ * {@link import('./chat-runtime-router.js').ChatRuntimeRouter} fronts it, the browser
+ * HTTP/WebSocket legacy path and verified-Discord ingress route through THIS runtime, so
+ * neither the controller nor the gateway retains `AgentService`, `piSession`, session,
+ * listener, channel, or metric access. Ownership (`userId`/`tenantId`) is re-checked by
+ * `AgentService` on every operation; a missing, foreign, or no-longer-owned conversation
+ * collapses to `conversation_unavailable` and never throws out of the port.
+ */
+@Injectable()
+export class EmbeddedChatRuntime implements ChatRuntime, LegacyEmbeddedChatPort {
+  readonly kind = 'embedded' as const;
+  private readonly logger = new Logger(EmbeddedChatRuntime.name);
+
+  constructor(readonly agentService: AgentService) {}
+
+  // -------------------------------------------------------------------------
+  // Legacy REST completion (op A)
+  // -------------------------------------------------------------------------
+
+  async completeLegacyRestTurn(
+    context: OwnedConversationContext,
+    input: Readonly<{ content: string }>,
+  ): Promise<
+    LegacyRuntimeResult<Readonly<{ text: string; presentation: LegacySessionPresentation }>>
+  > {
+    const scope = toScope(context.scope);
+    const { conversationId } = context;
+
+    const resolved = await this.resolveOrCreate(conversationId, scope, {});
+    if (!resolved.ok) return resolved;
+
+    let responseText = '';
+    const done = new Promise<void>((resolve, reject) => {
+      const timer = setTimeout(() => {
+        cleanup();
+        reject(new Error('Agent response timed out'));
+      }, REST_TURN_TIMEOUT_MS);
+
+      const cleanup = this.agentService.onEvent(
+        conversationId,
+        (event: AgentSessionEvent) => {
+          if (
+            event.type === 'message_update' &&
+            event.assistantMessageEvent.type === 'text_delta'
+          ) {
+            responseText += event.assistantMessageEvent.delta;
+          }
+          if (event.type === 'agent_end') {
+            clearTimeout(timer);
+            cleanup();
+            resolve();
+          }
+        },
+        scope,
+      );
+    });
+
+    try {
+      await this.agentService.prompt(conversationId, input.content, scope);
+      await done;
+    } catch (err) {
+      const message = err instanceof Error ? err.message : String(err);
+      if (message.includes('timed out')) {
+        return { ok: false, code: 'timeout', retryable: true };
+      }
+      this.logger.error(`Legacy REST turn failed for conversation=${conversationId}`, message);
+      return { ok: false, code: 'operation_failed', retryable: false };
+    }
+
+    const presentation = this.presentationFor(conversationId, scope) ?? resolved.presentation;
+    return { ok: true, value: { text: responseText, presentation } };
+  }
+
+  // -------------------------------------------------------------------------
+  // Legacy Socket streaming (op B)
+  // -------------------------------------------------------------------------
+
+  async prepareLegacySocketTurn(
+    context: OwnedConversationContext,
+    input: LegacyBrowserMessagePayload,
+    stream: LegacyRuntimeStream,
+  ): Promise<LegacyRuntimeResult<LegacySocketTurnLease>> {
+    const scope = toScope(context.scope);
+    const { conversationId } = context;
+
+    const resolved = await this.resolveOrCreate(conversationId, scope, {
+      ...(input.provider ? { provider: input.provider } : {}),
+      ...(input.modelId ? { modelId: input.modelId } : {}),
+      ...(input.agentId ? { agentConfigId: input.agentId } : {}),
+    });
+    if (!resolved.ok) return resolved;
+
+    let detach: () => void;
+    try {
+      detach = this.subscribe(conversationId, scope, stream);
+    } catch (err) {
+      // A partial listener/channel setup rolled itself back inside subscribe(); surface a total
+      // safe failure instead of throwing out of the port. Retryable — the attach is transient.
+      this.logger.error(
+        `Embedded socket subscription failed for conversation=${conversationId}`,
+        err instanceof Error ? err.message : String(err),
+      );
+      return { ok: false, code: 'runtime_unavailable', retryable: true };
+    }
+
+    return {
+      ok: true,
+      value: this.buildLease(
+        conversationId,
+        scope,
+        input.content,
+        input.attachments,
+        detach,
+        resolved.presentation,
+      ),
+    };
+  }
+
+  // -------------------------------------------------------------------------
+  // Thinking level (op C) — synchronous, total
+  // -------------------------------------------------------------------------
+
+  setLegacyThinking(
+    context: OwnedConversationContext,
+    level: string,
+  ): LegacyRuntimeResult<LegacySessionPresentation> {
+    const scope = toScope(context.scope);
+    const session = this.agentService.getSession(context.conversationId, scope);
+    if (!session) return CONVERSATION_UNAVAILABLE;
+
+    const availableThinkingLevels = session.piSession.getAvailableThinkingLevels();
+    if (!(availableThinkingLevels as readonly string[]).includes(level)) {
+      return {
+        ok: false,
+        code: 'thinking_level_invalid',
+        retryable: false,
+        availableThinkingLevels,
+      };
+    }
+
+    session.piSession.setThinkingLevel(level as never);
+    return { ok: true, value: this.presentationForSession(session) };
+  }
+
+  // -------------------------------------------------------------------------
+  // Abort (op D)
+  // -------------------------------------------------------------------------
+
+  async abortLegacyTurn(context: OwnedConversationContext): Promise<LegacyRuntimeResult<void>> {
+    const scope = toScope(context.scope);
+    const session = this.agentService.getSession(context.conversationId, scope);
+    if (!session) return CONVERSATION_UNAVAILABLE;
+
+    try {
+      await session.piSession.abort();
+    } catch (err) {
+      this.logger.error(
+        `Legacy abort failed for conversation=${context.conversationId}`,
+        err instanceof Error ? err.message : String(err),
+      );
+      return { ok: false, code: 'operation_failed', retryable: false };
+    }
+    return { ok: true, value: undefined };
+  }
+
+  // -------------------------------------------------------------------------
+  // Model override (synchronous, total)
+  // -------------------------------------------------------------------------
+
+  applyLegacyModelOverride(
+    context: OwnedConversationContext,
+    modelId: string,
+  ): LegacyRuntimeResult<LegacySessionPresentation> {
+    const scope = toScope(context.scope);
+    const session = this.agentService.getSession(context.conversationId, scope);
+    if (!session) return CONVERSATION_UNAVAILABLE;
+
+    this.agentService.updateSessionModel(context.conversationId, modelId, scope);
+    const refreshed = this.agentService.getSession(context.conversationId, scope) ?? session;
+    return { ok: true, value: this.presentationForSession(refreshed) };
+  }
+
+  // -------------------------------------------------------------------------
+  // Presentation read (synchronous, total)
+  // -------------------------------------------------------------------------
+
+  readLegacySessionPresentation(
+    context: OwnedConversationContext,
+  ): LegacyRuntimeResult<LegacySessionPresentation> {
+    const scope = toScope(context.scope);
+    const session = this.agentService.getSession(context.conversationId, scope);
+    if (!session) return CONVERSATION_UNAVAILABLE;
+    return { ok: true, value: this.presentationForSession(session) };
+  }
+
+  // -------------------------------------------------------------------------
+  // Verified Discord ingress (embedded-only in both modes)
+  // -------------------------------------------------------------------------
+
+  async dispatchVerifiedDiscordIngress(
+    context: VerifiedDiscordIngressContext,
+    stream: LegacyRuntimeStream,
+  ): Promise<LegacyRuntimeResult<VerifiedDiscordTurnLease>> {
+    const scope = toScope(context.scope);
+    const { conversationId } = context;
+
+    const resolved = await this.resolveOrCreate(conversationId, scope, {
+      agentConfigId: context.configuredAgent.agentConfigId,
+    });
+    if (!resolved.ok) return resolved;
+
+    let detach: () => void;
+    try {
+      detach = this.subscribe(conversationId, scope, stream);
+    } catch (err) {
+      // A partial listener/channel setup rolled itself back inside subscribe(); surface a total
+      // safe failure instead of throwing out of the port. Retryable — the attach is transient.
+      this.logger.error(
+        `Embedded Discord subscription failed for conversation=${conversationId}`,
+        err instanceof Error ? err.message : String(err),
+      );
+      return { ok: false, code: 'runtime_unavailable', retryable: true };
+    }
+
+    return {
+      ok: true,
+      value: this.buildLease(
+        conversationId,
+        scope,
+        context.content,
+        context.attachments,
+        detach,
+        resolved.presentation,
+      ),
+    };
+  }
+
+  // -------------------------------------------------------------------------
+  // Shared helpers
+  // -------------------------------------------------------------------------
+
+  /**
+   * Resolves the owned session, creating it on first use. Ownership/scope rejections
+   * (`Forbidden`/`NotFound`) collapse to `conversation_unavailable`; any other creation
+   * failure surfaces as the retryable `runtime_unavailable`. On success returns the
+   * session presentation so callers avoid a redundant `getSession`.
+   */
+  private async resolveOrCreate(
+    conversationId: string,
+    scope: ActorTenantScope,
+    extraOptions: Readonly<{ provider?: string; modelId?: string; agentConfigId?: string }>,
+  ): Promise<
+    | { readonly ok: true; readonly presentation: LegacySessionPresentation }
+    | Exclude<LegacyRuntimeResult<never>, { ok: true }>
+  > {
+    let session = this.agentService.getSession(conversationId, scope);
+    if (!session) {
+      try {
+        session = await this.agentService.createSession(conversationId, {
+          userId: scope.userId,
+          tenantId: scope.tenantId,
+          ...extraOptions,
+        });
+      } catch (err) {
+        if (err instanceof ForbiddenException || err instanceof NotFoundException) {
+          return CONVERSATION_UNAVAILABLE;
+        }
+        this.logger.error(
+          `Embedded session creation failed for conversation=${conversationId}`,
+          err instanceof Error ? err.stack : String(err),
+        );
+        return { ok: false, code: 'runtime_unavailable', retryable: true };
+      }
+    }
+    return { ok: true, presentation: this.presentationForSession(session) };
+  }
+
+  /** Installs a normalizing event listener that forwards to the server-owned stream. */
+  private subscribe(
+    conversationId: string,
+    scope: ActorTenantScope,
+    stream: LegacyRuntimeStream,
+  ): () => void {
+    const unsubscribe = this.agentService.onEvent(
+      conversationId,
+      (event: AgentSessionEvent) => {
+        const normalized = this.normalizeEvent(conversationId, scope, event);
+        if (normalized) stream.onEvent(normalized);
+      },
+      scope,
+    );
+    try {
+      this.agentService.addChannel(conversationId, stream.channelId, scope);
+    } catch (err) {
+      // Partial setup: the listener was acquired but the channel attach failed. Roll back
+      // exactly what was acquired (the listener) before the failure escapes, so no leaked
+      // subscription survives; the caller converts the rethrow into a total safe failure.
+      try {
+        unsubscribe();
+      } catch {
+        /* idempotent teardown */
+      }
+      throw err;
+    }
+    return () => {
+      try {
+        unsubscribe();
+      } catch {
+        /* idempotent teardown */
+      }
+      try {
+        this.agentService.removeChannel(conversationId, stream.channelId, scope);
+      } catch {
+        /* idempotent teardown */
+      }
+    };
+  }
+
+  /** Builds an atomically one-shot, scope-rechecking dispatch lease. */
+  private buildLease(
+    conversationId: string,
+    scope: ActorTenantScope,
+    content: string,
+    attachments: VerifiedDiscordIngressContext['attachments'],
+    detach: () => void,
+    presentation: LegacySessionPresentation,
+  ): LegacySocketTurnLease & VerifiedDiscordTurnLease {
+    let dispatched = false;
+    let disposed = false;
+    return {
+      presentation,
+      dispatch: async (): Promise<LegacyRuntimeResult<void>> => {
+        if (dispatched) {
+          return { ok: false, code: 'turn_already_dispatched', retryable: false };
+        }
+        dispatched = true;
+        try {
+          await this.agentService.prompt(conversationId, content, scope, attachments);
+        } catch (err) {
+          this.logger.error(
+            `Legacy dispatch failed for conversation=${conversationId}`,
+            err instanceof Error ? err.message : String(err),
+          );
+          return { ok: false, code: 'operation_failed', retryable: false };
+        }
+        return { ok: true, value: undefined };
+      },
+      dispose: async (): Promise<void> => {
+        if (disposed) return;
+        disposed = true;
+        detach();
+      },
+    };
+  }
+
+  /** Normalizes a raw agent event into the redaction-agnostic transport event, or drops it. */
+  private normalizeEvent(
+    conversationId: string,
+    scope: ActorTenantScope,
+    event: AgentSessionEvent,
+  ): LegacyRuntimeEvent | undefined {
+    switch (event.type) {
+      case 'agent_start':
+        return { type: 'started' };
+      case 'agent_end':
+        return { type: 'settled', ...this.usageFor(conversationId, scope) };
+      case 'message_update': {
+        const assistant = event.assistantMessageEvent;
+        if (assistant.type === 'text_delta') return { type: 'text_delta', text: assistant.delta };
+        if (assistant.type === 'thinking_delta') {
+          return { type: 'thinking_delta', text: assistant.delta };
+        }
+        return undefined;
+      }
+      case 'tool_execution_start':
+        return { type: 'tool_started', toolCallId: event.toolCallId, toolName: event.toolName };
+      case 'tool_execution_end':
+        return {
+          type: 'tool_finished',
+          toolCallId: event.toolCallId,
+          toolName: event.toolName,
+          isError: event.isError,
+        };
+      default:
+        return undefined;
+    }
+  }
+
+  /**
+   * Gathers terminal usage from the Pi session and records it into session metrics.
+   * Embedded owns AgentService metrics; the gateway never touches `piSession` stats.
+   */
+  private usageFor(conversationId: string, scope: ActorTenantScope): { usage?: LegacyUsage } {
+    const session = this.agentService.getSession(conversationId, scope);
+    const piSession = session?.piSession;
+    const stats = piSession?.getSessionStats();
+    if (!session || !stats) return {};
+    const contextUsage = piSession?.getContextUsage();
+
+    const tokens = {
+      input: stats.tokens?.input ?? 0,
+      output: stats.tokens?.output ?? 0,
+      cacheRead: stats.tokens?.cacheRead ?? 0,
+      cacheWrite: stats.tokens?.cacheWrite ?? 0,
+      total: stats.tokens?.total ?? 0,
+    };
+
+    this.agentService.recordTokenUsage(conversationId, { ...tokens });
+
+    return {
+      usage: {
+        provider: session.provider,
+        modelId: session.modelId,
+        thinkingLevel: piSession?.thinkingLevel ?? 'off',
+        tokens,
+        cost: stats.cost ?? 0,
+        context: {
+          percent: contextUsage?.percent ?? null,
+          window: contextUsage?.contextWindow ?? 0,
+        },
+      },
+    };
+  }
+
+  /** Presentation from a live session id, or undefined when no owned session exists. */
+  private presentationFor(
+    conversationId: string,
+    scope: ActorTenantScope,
+  ): LegacySessionPresentation | undefined {
+    const session = this.agentService.getSession(conversationId, scope);
+    return session ? this.presentationForSession(session) : undefined;
+  }
+
+  /** User-facing projection carrying no session handle, credential, or raw stats. */
+  private presentationForSession(session: AgentSession): LegacySessionPresentation {
+    return {
+      provider: session.provider,
+      modelId: session.modelId,
+      thinkingLevel: session.piSession.thinkingLevel,
+      availableThinkingLevels: session.piSession.getAvailableThinkingLevels(),
+      ...(session.agentName ? { agentName: session.agentName } : {}),
+    };
+  }
+}
+
+/** The shared terminal `conversation_unavailable` failure (missing/foreign/lost ownership). */
+const CONVERSATION_UNAVAILABLE = {
+  ok: false as const,
+  code: 'conversation_unavailable' as const,
+  retryable: false as const,
+};
+
+/** Narrows a branded context scope to the `AgentService` actor/tenant scope (identical shape). */
+function toScope(scope: Readonly<{ userId: string; tenantId: string }>): ActorTenantScope {
+  return { userId: scope.userId, tenantId: scope.tenantId };
+}

apps/gateway/src/chat/harness-chat.runtime.spec.ts

@@ -0,0 +1,170 @@
+import { describe, expect, it } from 'vitest';
+import type {
+  AttachConversation,
+  ConversationSnapshot,
+  DetachConversation,
+  HarnessActorContext,
+  HarnessConversationService,
+  HarnessEventEnvelope,
+  HarnessSelection,
+  SendHarnessTurn,
+  TurnReceipt,
+} from '@mosaicstack/types';
+import { HarnessChatRuntime } from './harness-chat.runtime.js';
+
+/**
+ * Task Five, Step One (harness runtime). Proves the `pi-rpc` runtime executes
+ * exclusively through the {@link HarnessConversationService} RPC boundary and
+ * forwards the caller's exact selection tuple and idempotency key without
+ * substitution. Red-first: the runtime is an unimplemented stub, so every
+ * delegation assertion fails until Step Three.
+ */
+
+const context: HarnessActorContext = {
+  actorId: 'actor-1',
+  tenantId: 'tenant-1',
+  seatId: 'seat-1',
+  correlationId: 'corr-1',
+};
+
+const selection: HarnessSelection = {
+  harnessId: 'pi',
+  providerId: 'anthropic',
+  modelId: 'claude-opus-4-8',
+};
+
+const conversationId = '11111111-1111-4111-8111-111111111111';
+const idempotencyKey = '22222222-2222-4222-8222-222222222222';
+
+const sendInput: SendHarnessTurn & { idempotencyKey: string } = {
+  context,
+  conversationId,
+  selection,
+  turnId: 'turn-abc',
+  correlationId: 'corr-1',
+  content: 'hello',
+  idempotencyKey,
+};
+
+const attachInput: AttachConversation & { afterSequence?: number } = {
+  context,
+  conversationId,
+  clientId: 'client-1',
+  selection,
+  afterSequence: 0,
+};
+
+const detachInput: DetachConversation = {
+  context,
+  conversationId,
+  clientId: 'client-1',
+};
+
+interface RecordedCalls {
+  attach: (AttachConversation & { afterSequence?: number })[];
+  detach: DetachConversation[];
+  send: (SendHarnessTurn & { idempotencyKey: string })[];
+  subscribeFrom: { conversationId: string; afterSequence: number }[];
+}
+
+const snapshot: ConversationSnapshot = {
+  session: {
+    conversationId,
+    nativeSessionId: 'native-1',
+    seatId: 'seat-1',
+    selection,
+    state: 'idle',
+    attachedClientIds: ['client-1'],
+  },
+  lastSequence: 0,
+  replay: [],
+};
+
+function build(): { runtime: HarnessChatRuntime; calls: RecordedCalls } {
+  const calls: RecordedCalls = { attach: [], detach: [], send: [], subscribeFrom: [] };
+  const service: HarnessConversationService = {
+    attach: (input) => {
+      calls.attach.push(input);
+      return Promise.resolve(snapshot);
+    },
+    detach: (input) => {
+      calls.detach.push(input);
+      return Promise.resolve();
+    },
+    send: (input) => {
+      calls.send.push(input);
+      // The service echoes only the requested tuple; there is no representable substitute.
+      const receipt: TurnReceipt = {
+        conversationId: input.conversationId,
+        turnId: 'turn-server',
+        correlationId: input.correlationId,
+        state: 'accepted',
+        selection: input.selection,
+      };
+      return Promise.resolve(receipt);
+    },
+    subscribeFrom: (id, afterSequence) => {
+      calls.subscribeFrom.push({ conversationId: id, afterSequence });
+
+      return (async function* (): AsyncIterable<HarnessEventEnvelope> {
+        return;
+      })();
+    },
+  };
+  return { runtime: new HarnessChatRuntime(service), calls };
+}
+
+describe('HarnessChatRuntime', () => {
+  it('is the harness runtime kind and needs only a HarnessConversationService', () => {
+    const { runtime } = build();
+    expect(runtime.kind).toBe('harness');
+  });
+
+  it('delegates send to the conversation service with the exact tuple and idempotency key', async () => {
+    const { runtime, calls } = build();
+
+    const receipt = await runtime.send(sendInput);
+
+    expect(calls.send).toHaveLength(1);
+    const firstSend = calls.send[0]!;
+    expect(firstSend).toEqual(sendInput);
+    expect(firstSend.idempotencyKey).toBe(idempotencyKey);
+    expect(firstSend.selection).toEqual(selection);
+    // The runtime must not substitute an effective tuple onto the receipt.
+    expect(receipt.selection).toEqual(selection);
+  });
+
+  it('delegates attach to the conversation service and returns its snapshot', async () => {
+    const { runtime, calls } = build();
+
+    const result = await runtime.attach(attachInput);
+
+    expect(calls.attach).toHaveLength(1);
+    expect(calls.attach[0]).toEqual(attachInput);
+    expect(result).toBe(snapshot);
+  });
+
+  it('delegates detach to the conversation service', async () => {
+    const { runtime, calls } = build();
+
+    await runtime.detach(detachInput);
+
+    expect(calls.detach).toHaveLength(1);
+    expect(calls.detach[0]).toEqual(detachInput);
+  });
+
+  it('delegates subscribeFrom to the conversation service journal replay', async () => {
+    const { runtime, calls } = build();
+
+    const iterable = runtime.subscribeFrom(conversationId, 7);
+    // Drain to prove it is the service-backed async iterable, not a fabricated one.
+    const drained: unknown[] = [];
+    for await (const event of iterable) {
+      drained.push(event);
+    }
+    expect(drained).toHaveLength(0);
+
+    expect(calls.subscribeFrom).toHaveLength(1);
+    expect(calls.subscribeFrom[0]).toEqual({ conversationId, afterSequence: 7 });
+  });
+});

apps/gateway/src/chat/harness-chat.runtime.ts

@@ -0,0 +1,47 @@
+import type {
+  AttachConversation,
+  ConversationSnapshot,
+  DetachConversation,
+  HarnessConversationService,
+  HarnessEventEnvelope,
+  SendHarnessTurn,
+  TurnReceipt,
+} from '@mosaicstack/types';
+import type { ChatRuntime } from './chat-runtime.js';
+
+/**
+ * The `pi-rpc` chat runtime. It executes browser chat exclusively through the
+ * harness-neutral {@link HarnessConversationService} RPC boundary — it never
+ * touches the embedded `AgentService`/`ProviderService`/`RoutingEngineService`
+ * stack, and it forwards the caller's exact selection tuple and idempotency key
+ * without substitution.
+ *
+ * It owns no state and adds no policy: every method forwards the caller's exact
+ * argument to the injected {@link HarnessConversationService} and returns its
+ * result unchanged, so the requested selection tuple and idempotency key can
+ * never be substituted on the way through.
+ */
+export class HarnessChatRuntime implements ChatRuntime {
+  readonly kind = 'harness' as const;
+
+  constructor(private readonly conversations: HarnessConversationService) {}
+
+  attach(input: AttachConversation & { afterSequence?: number }): Promise<ConversationSnapshot> {
+    return this.conversations.attach(input);
+  }
+
+  detach(input: DetachConversation): Promise<void> {
+    return this.conversations.detach(input);
+  }
+
+  send(input: SendHarnessTurn & { idempotencyKey: string }): Promise<TurnReceipt> {
+    return this.conversations.send(input);
+  }
+
+  subscribeFrom(
+    conversationId: string,
+    afterSequence: number,
+  ): AsyncIterable<HarnessEventEnvelope> {
+    return this.conversations.subscribeFrom(conversationId, afterSequence);
+  }
+}

apps/gateway/src/commands/command-authorization.service.spec.ts

@@ -0,0 +1,116 @@
+import { describe, expect, it } from 'vitest';
+import type { CommandDef, SlashCommandPayload } from '@mosaicstack/types';
+import { CommandAuthorizationService } from './command-authorization.service.js';
+
+const adminCommand: CommandDef = {
+  name: 'gc',
+  description: 'GC',
+  aliases: [],
+  scope: 'admin',
+  execution: 'socket',
+  available: true,
+};
+const payload: SlashCommandPayload = { command: 'gc', conversationId: 'conversation-1' };
+
+function createService(
+  role: string,
+  entries: Map<string, string> = new Map<string, string>(),
+): CommandAuthorizationService {
+  const db = {
+    select: () => ({ from: () => ({ where: () => ({ limit: async () => [{ role }] }) }) }),
+  };
+  const redis = {
+    get: async (key: string) => entries.get(key) ?? null,
+    set: async (key: string, value: string) => {
+      entries.set(key, value);
+    },
+    del: async (key: string) => Number(entries.delete(key)),
+  };
+  return new CommandAuthorizationService(db as never, redis);
+}
+
+describe('CommandAuthorizationService', () => {
+  it('consumes one exact actor-bound approval once', async (): Promise<void> => {
+    const service = createService('admin');
+    const approval = await service.createApproval(adminCommand, payload, 'admin-1');
+    expect(approval).not.toBeNull();
+    expect(
+      (await service.authorize(adminCommand, payload, 'admin-1', approval!.approvalId)).allowed,
+    ).toBe(true);
+    expect(
+      (await service.authorize(adminCommand, payload, 'admin-1', approval!.approvalId)).allowed,
+    ).toBe(false);
+  });
+
+  it('rejects an approval when the structured action is mutated', async (): Promise<void> => {
+    const service = createService('admin');
+    const approval = await service.createApproval(adminCommand, payload, 'admin-1');
+    const mutated = { ...payload, conversationId: 'other-conversation' };
+    expect(approval).not.toBeNull();
+    expect(
+      (await service.authorize(adminCommand, mutated, 'admin-1', approval!.approvalId)).allowed,
+    ).toBe(false);
+  });
+
+  it('denies an admin command to a member before approval is considered', async (): Promise<void> => {
+    const service = createService('member');
+    const approval = await service.createApproval(adminCommand, payload, 'member-1');
+    expect(approval).toBeNull();
+    expect(
+      (await service.authorize(adminCommand, payload, 'member-1', 'forged-approval-id')).allowed,
+    ).toBe(false);
+  });
+
+  it('denies a malformed durable approval expiry instead of treating it as unexpired', async (): Promise<void> => {
+    const entries = new Map<string, string>();
+    const action = {
+      providerId: 'fleet',
+      sessionId: 'nova',
+      actorId: 'admin-1',
+      tenantId: 'tenant-1',
+      channelId: 'discord:operator',
+      correlationId: 'correlation-malformed-expiry',
+      agentName: 'Nova',
+    };
+    const service = createService('admin', entries);
+    const approval = await service.createRuntimeTerminationApproval(action);
+    expect(approval).not.toBeNull();
+    const key = `agent:Nova:command-approval:${approval!.approvalId}`;
+    const stored = entries.get(key);
+    expect(stored).toBeDefined();
+    entries.set(key, JSON.stringify({ ...JSON.parse(stored!), expiresAt: 'not-a-date' }));
+
+    expect(await service.consumeRuntimeTerminationApproval(approval!.approvalId, action)).toBe(
+      false,
+    );
+  });
+
+  it('persists and consumes one exact runtime termination approval across a service restart', async (): Promise<void> => {
+    const entries = new Map<string, string>();
+    const action = {
+      providerId: 'fleet',
+      sessionId: 'nova',
+      actorId: 'admin-1',
+      tenantId: 'tenant-1',
+      channelId: 'discord:operator',
+      correlationId: 'correlation-1',
+      agentName: 'Nova',
+    };
+    const beforeRestart = createService('admin', entries);
+    const approval = await beforeRestart.createRuntimeTerminationApproval(action);
+
+    const afterRestart = createService('admin', entries);
+    expect(
+      await afterRestart.consumeRuntimeTerminationApproval(approval!.approvalId, {
+        ...action,
+        sessionId: 'forged-session',
+      }),
+    ).toBe(false);
+    expect(await afterRestart.consumeRuntimeTerminationApproval(approval!.approvalId, action)).toBe(
+      true,
+    );
+    expect(await afterRestart.consumeRuntimeTerminationApproval(approval!.approvalId, action)).toBe(
+      false,
+    );
+  });
+});

apps/gateway/src/commands/command-authorization.service.ts

@@ -0,0 +1,268 @@
+import { createHash, randomUUID } from 'node:crypto';
+import { Inject, Injectable } from '@nestjs/common';
+import { eq, users as usersTable, type Db } from '@mosaicstack/db';
+import type { CommandDef, SlashCommandPayload } from '@mosaicstack/types';
+import { DB } from '../database/database.module.js';
+import { COMMANDS_REDIS } from './commands.tokens.js';
+
+export type CommandRole = 'admin' | 'member' | 'viewer';
+
+export interface CommandApproval {
+  approvalId: string;
+  actionDigest: string;
+  actorId: string;
+  command: string;
+  expiresAt: string;
+}
+
+/** Exact immutable binding for a privileged runtime termination. */
+export interface RuntimeTerminationApprovalAction {
+  providerId: string;
+  sessionId: string;
+  actorId: string;
+  tenantId: string;
+  channelId: string;
+  correlationId: string;
+  /** Provisioned roster identity; isolates approvals between interaction agents. */
+  agentName: string;
+}
+
+export interface RuntimeTerminationApproval extends RuntimeTerminationApprovalAction {
+  approvalId: string;
+  actionDigest: string;
+  expiresAt: string;
+}
+
+export interface CommandAuthorizationResult {
+  allowed: boolean;
+  reason?: string;
+}
+
+@Injectable()
+export class CommandAuthorizationService {
+  constructor(
+    @Inject(DB) private readonly db: Db,
+    @Inject(COMMANDS_REDIS)
+    private readonly redis: {
+      get(key: string): Promise<string | null>;
+      set(key: string, value: string, ...args: string[]): Promise<unknown>;
+      del(key: string): Promise<number>;
+    },
+  ) {}
+
+  async authorize(
+    command: CommandDef,
+    payload: SlashCommandPayload,
+    actorId: string,
+    approvalId?: string,
+  ): Promise<CommandAuthorizationResult> {
+    const role = await this.resolveRole(actorId);
+    if (!role || !this.hasScope(role, command.scope)) {
+      return { allowed: false, reason: 'not authorized for this command scope' };
+    }
+    if (command.scope !== 'admin') return { allowed: true };
+    if (!approvalId) return { allowed: false, reason: 'durable approval is required' };
+    const actionDigest = this.actionDigest(command.name, payload);
+    const approved = await this.consumeApproval(approvalId, actorId, actionDigest);
+    return approved
+      ? { allowed: true }
+      : {
+          allowed: false,
+          reason: 'approval is invalid, expired, replayed, or does not match this action',
+        };
+  }
+
+  async createApproval(
+    command: CommandDef,
+    payload: SlashCommandPayload,
+    actorId: string,
+  ): Promise<CommandApproval | null> {
+    const role = await this.resolveRole(actorId);
+    if (!role || command.scope !== 'admin' || !this.hasScope(role, command.scope)) return null;
+
+    const approvalId = randomUUID();
+    const expiresAt = new Date(Date.now() + 5 * 60_000).toISOString();
+    const approval: CommandApproval = {
+      approvalId,
+      actionDigest: this.actionDigest(command.name, payload),
+      actorId,
+      command: command.name,
+      expiresAt,
+    };
+    await this.redis.set(this.key(approvalId), JSON.stringify(approval), 'EX', '300');
+    return approval;
+  }
+
+  /**
+   * Uses the same `interaction:command-approval:*` store and one-time deletion rule as
+   * command approvals. This deliberately avoids a parallel approval database.
+   */
+  async createRuntimeTerminationApproval(
+    action: RuntimeTerminationApprovalAction,
+  ): Promise<RuntimeTerminationApproval | null> {
+    if (!this.hasRuntimeTerminationAction(action)) return null;
+    const role = await this.resolveRole(action.actorId);
+    if (role !== 'admin') return null;
+
+    const approval: RuntimeTerminationApproval = {
+      approvalId: randomUUID(),
+      actionDigest: this.runtimeActionDigest(action),
+      ...action,
+      expiresAt: new Date(Date.now() + 5 * 60_000).toISOString(),
+    };
+    await this.redis.set(
+      this.runtimeKey(action.agentName, approval.approvalId),
+      JSON.stringify(approval),
+      'EX',
+      '300',
+    );
+    return approval;
+  }
+
+  async consumeRuntimeTerminationApproval(
+    approvalId: string,
+    action: RuntimeTerminationApprovalAction,
+  ): Promise<boolean> {
+    const encoded = await this.redis.get(this.runtimeKey(action.agentName, approvalId));
+    if (!encoded) return false;
+    let approval: unknown;
+    try {
+      approval = JSON.parse(encoded);
+    } catch {
+      return false;
+    }
+    if (
+      !this.isRuntimeTerminationApproval(approval) ||
+      approval.actionDigest !== this.runtimeActionDigest(action) ||
+      approval.actorId !== action.actorId ||
+      approval.tenantId !== action.tenantId ||
+      !this.isUnexpired(approval.expiresAt)
+    ) {
+      return false;
+    }
+    if ((await this.resolveRole(approval.actorId)) !== 'admin') return false;
+    return (await this.redis.del(this.runtimeKey(action.agentName, approvalId))) === 1;
+  }
+
+  private async resolveRole(actorId: string): Promise<CommandRole | null> {
+    const [user] = await this.db
+      .select({ role: usersTable.role })
+      .from(usersTable)
+      .where(eq(usersTable.id, actorId))
+      .limit(1);
+    const role = user?.role;
+    return role === 'admin' || role === 'member' || role === 'viewer' ? role : null;
+  }
+
+  private hasScope(role: CommandRole, scope: CommandDef['scope']): boolean {
+    if (role === 'admin') return true;
+    return role === 'member' && (scope === 'core' || scope === 'agent');
+  }
+
+  private async consumeApproval(
+    approvalId: string,
+    actorId: string,
+    actionDigest: string,
+  ): Promise<boolean> {
+    const key = this.key(approvalId);
+    const encoded = await this.redis.get(key);
+    if (!encoded) return false;
+    let parsed: unknown;
+    try {
+      parsed = JSON.parse(encoded);
+    } catch {
+      return false;
+    }
+    if (
+      !this.isCommandApproval(parsed) ||
+      parsed.actorId !== actorId ||
+      parsed.actionDigest !== actionDigest ||
+      !this.isUnexpired(parsed.expiresAt)
+    )
+      return false;
+    return (await this.redis.del(key)) === 1;
+  }
+
+  private actionDigest(command: string, payload: SlashCommandPayload): string {
+    return createHash('sha256')
+      .update(
+        JSON.stringify({
+          command,
+          args: payload.args?.trim() ?? '',
+          conversationId: payload.conversationId,
+        }),
+      )
+      .digest('hex');
+  }
+
+  private hasRuntimeTerminationAction(action: RuntimeTerminationApprovalAction): boolean {
+    return [
+      action.providerId,
+      action.sessionId,
+      action.actorId,
+      action.tenantId,
+      action.channelId,
+      action.correlationId,
+      action.agentName,
+    ].every((value: string): boolean => value.trim().length > 0);
+  }
+
+  private runtimeActionDigest(action: RuntimeTerminationApprovalAction): string {
+    return createHash('sha256')
+      .update(
+        JSON.stringify({
+          providerId: action.providerId,
+          sessionId: action.sessionId,
+          actorId: action.actorId,
+          tenantId: action.tenantId,
+          channelId: action.channelId,
+          correlationId: action.correlationId,
+          agentName: action.agentName,
+        }),
+      )
+      .digest('hex');
+  }
+
+  private isUnexpired(expiresAt: unknown): expiresAt is string {
+    if (typeof expiresAt !== 'string') return false;
+    const expiresAtMs = Date.parse(expiresAt);
+    return Number.isFinite(expiresAtMs) && expiresAtMs > Date.now();
+  }
+
+  private isCommandApproval(value: unknown): value is CommandApproval {
+    return (
+      typeof value === 'object' &&
+      value !== null &&
+      'approvalId' in value &&
+      'actionDigest' in value &&
+      'actorId' in value &&
+      'expiresAt' in value &&
+      'command' in value
+    );
+  }
+
+  private isRuntimeTerminationApproval(value: unknown): value is RuntimeTerminationApproval {
+    return (
+      typeof value === 'object' &&
+      value !== null &&
+      'approvalId' in value &&
+      'actionDigest' in value &&
+      'actorId' in value &&
+      'tenantId' in value &&
+      'providerId' in value &&
+      'sessionId' in value &&
+      'channelId' in value &&
+      'correlationId' in value &&
+      'agentName' in value &&
+      'expiresAt' in value
+    );
+  }
+
+  private key(approvalId: string): string {
+    return `interaction:command-approval:${approvalId}`;
+  }
+
+  private runtimeKey(agentName: string, approvalId: string): string {
+    return `agent:${encodeURIComponent(agentName)}:command-approval:${approvalId}`;
+  }
+}

apps/gateway/src/commands/command-executor-p8012.spec.ts

@@ -1,3 +1,4 @@
+import { Logger } from '@nestjs/common';
 import { describe, it, expect, vi, beforeEach } from 'vitest';
 import { CommandExecutorService } from './command-executor.service.js';
 import type { SlashCommandPayload } from '@mosaicstack/types';
@@ -12,6 +13,7 @@ const mockRegistry = {
       { name: 'agent', aliases: ['a'], scope: 'agent', execution: 'socket', available: true },
       { name: 'prdy', aliases: [], scope: 'agent', execution: 'socket', available: true },
       { name: 'tools', aliases: [], scope: 'agent', execution: 'socket', available: true },
+      { name: 'mcp', aliases: [], scope: 'agent', execution: 'socket', available: true },
     ],
     skills: [],
   })),
@@ -72,23 +74,37 @@ const mockChatGateway = {
   broadcastSessionInfo: vi.fn(),
 };
 
-function buildService(): CommandExecutorService {
+const mockMcpClient = {
+  reconnectServer: vi.fn().mockResolvedValue(undefined),
+  getServerStatuses: vi.fn(() => []),
+  getToolDefinitions: vi.fn(() => []),
+};
+
+function buildService(
+  redis: typeof mockRedis | null = mockRedis,
+  mcpClient: {
+    reconnectServer: ReturnType<typeof vi.fn>;
+    getServerStatuses: ReturnType<typeof vi.fn>;
+    getToolDefinitions: ReturnType<typeof vi.fn>;
+  } = mockMcpClient,
+): CommandExecutorService {
   return new CommandExecutorService(
     mockRegistry as never,
     mockAgentService as never,
     mockSystemOverride as never,
     mockSessionGC as never,
-    mockRedis as never,
+    redis as never,
     mockBrain as never,
     null,
     mockChatGateway as never,
-    null,
+    mcpClient as never,
   );
 }
 
 describe('CommandExecutorService — P8-012 commands', () => {
   let service: CommandExecutorService;
   const userId = 'user-123';
+  const userScope = { userId, tenantId: userId };
   const conversationId = 'conv-456';
 
   beforeEach(() => {
@@ -99,31 +115,26 @@ describe('CommandExecutorService — P8-012 commands', () => {
   // /provider login — missing provider name
   it('/provider login with no provider name returns usage error', async () => {
     const payload: SlashCommandPayload = { command: 'provider', args: 'login', conversationId };
-    const result = await service.execute(payload, userId);
+    const result = await service.execute(payload, userScope);
     expect(result.success).toBe(false);
     expect(result.message).toContain('Usage: /provider login');
     expect(result.command).toBe('provider');
   });
 
-  // /provider login anthropic — success with URL containing poll token
-  it('/provider login <name> returns success with URL and poll token', async () => {
+  // /provider login anthropic — no bearer token or auth URL reaches chat output
+  it('/provider login <name> keeps its one-time token out of chat output', async () => {
     const payload: SlashCommandPayload = {
       command: 'provider',
       args: 'login anthropic',
       conversationId,
     };
-    const result = await service.execute(payload, userId);
+    const result = await service.execute(payload, userScope);
     expect(result.success).toBe(true);
     expect(result.command).toBe('provider');
     expect(result.message).toContain('anthropic');
-    expect(result.message).toContain('http');
-    // data should contain loginUrl and pollToken
-    expect(result.data).toBeDefined();
-    const data = result.data as Record<string, unknown>;
-    expect(typeof data['loginUrl']).toBe('string');
-    expect(typeof data['pollToken']).toBe('string');
-    expect(data['loginUrl'] as string).toContain('anthropic');
-    expect(data['loginUrl'] as string).toContain(data['pollToken'] as string);
+    expect(result.message).not.toContain('http');
+    expect(result.message).not.toContain('token=');
+    expect(result.data).toEqual({ provider: 'anthropic' });
     // Verify Valkey was called
     expect(mockRedis.set).toHaveBeenCalledOnce();
     const [key, value, , ttl] = mockRedis.set.mock.calls[0] as [string, string, string, number];
@@ -135,10 +146,26 @@ describe('CommandExecutorService — P8-012 commands', () => {
     expect(ttl).toBe(300);
   });
 
+  it('/provider login remains available without Redis on the local tier', async () => {
+    const localService = buildService(null);
+    const payload: SlashCommandPayload = {
+      command: 'provider',
+      args: 'login anthropic',
+      conversationId,
+    };
+
+    const result = await localService.execute(payload, userScope);
+
+    expect(result.success).toBe(true);
+    expect(result.message).not.toContain('token=');
+    expect(result.data).toEqual({ provider: 'anthropic' });
+    expect(mockRedis.set).not.toHaveBeenCalled();
+  });
+
   // /provider with no args — returns usage
   it('/provider with no args returns usage message', async () => {
     const payload: SlashCommandPayload = { command: 'provider', conversationId };
-    const result = await service.execute(payload, userId);
+    const result = await service.execute(payload, userScope);
     expect(result.success).toBe(true);
     expect(result.message).toContain('Usage: /provider');
   });
@@ -146,7 +173,7 @@ describe('CommandExecutorService — P8-012 commands', () => {
   // /provider list
   it('/provider list returns success', async () => {
     const payload: SlashCommandPayload = { command: 'provider', args: 'list', conversationId };
-    const result = await service.execute(payload, userId);
+    const result = await service.execute(payload, userScope);
     expect(result.success).toBe(true);
     expect(result.command).toBe('provider');
   });
@@ -154,7 +181,7 @@ describe('CommandExecutorService — P8-012 commands', () => {
   // /provider logout with no name — usage error
   it('/provider logout with no name returns error', async () => {
     const payload: SlashCommandPayload = { command: 'provider', args: 'logout', conversationId };
-    const result = await service.execute(payload, userId);
+    const result = await service.execute(payload, userScope);
     expect(result.success).toBe(false);
     expect(result.message).toContain('Usage: /provider logout');
   });
@@ -166,7 +193,7 @@ describe('CommandExecutorService — P8-012 commands', () => {
       args: 'unknown',
       conversationId,
     };
-    const result = await service.execute(payload, userId);
+    const result = await service.execute(payload, userScope);
     expect(result.success).toBe(false);
     expect(result.message).toContain('Unknown subcommand');
   });
@@ -174,7 +201,7 @@ describe('CommandExecutorService — P8-012 commands', () => {
   // /mission status
   it('/mission status returns stub message', async () => {
     const payload: SlashCommandPayload = { command: 'mission', args: 'status', conversationId };
-    const result = await service.execute(payload, userId);
+    const result = await service.execute(payload, userScope);
     expect(result.success).toBe(true);
     expect(result.command).toBe('mission');
     expect(result.message).toContain('Mission status');
@@ -183,7 +210,7 @@ describe('CommandExecutorService — P8-012 commands', () => {
   // /mission with no args
   it('/mission with no args returns status stub', async () => {
     const payload: SlashCommandPayload = { command: 'mission', conversationId };
-    const result = await service.execute(payload, userId);
+    const result = await service.execute(payload, userScope);
     expect(result.success).toBe(true);
     expect(result.message).toContain('Mission status');
   });
@@ -195,7 +222,7 @@ describe('CommandExecutorService — P8-012 commands', () => {
       args: 'set my-mission-123',
       conversationId,
     };
-    const result = await service.execute(payload, userId);
+    const result = await service.execute(payload, userScope);
     expect(result.success).toBe(true);
     expect(result.message).toContain('my-mission-123');
   });
@@ -203,7 +230,7 @@ describe('CommandExecutorService — P8-012 commands', () => {
   // /agent list
   it('/agent list returns stub message', async () => {
     const payload: SlashCommandPayload = { command: 'agent', args: 'list', conversationId };
-    const result = await service.execute(payload, userId);
+    const result = await service.execute(payload, userScope);
     expect(result.success).toBe(true);
     expect(result.command).toBe('agent');
     expect(result.message).toContain('agent');
@@ -212,7 +239,7 @@ describe('CommandExecutorService — P8-012 commands', () => {
   // /agent with no args
   it('/agent with no args returns usage', async () => {
     const payload: SlashCommandPayload = { command: 'agent', conversationId };
-    const result = await service.execute(payload, userId);
+    const result = await service.execute(payload, userScope);
     expect(result.success).toBe(true);
     expect(result.message).toContain('Usage: /agent');
   });
@@ -224,7 +251,7 @@ describe('CommandExecutorService — P8-012 commands', () => {
       args: 'my-agent-id',
       conversationId,
     };
-    const result = await service.execute(payload, userId);
+    const result = await service.execute(payload, userScope);
     expect(result.success).toBe(true);
     expect(result.message).toContain('my-agent-id');
   });
@@ -232,7 +259,7 @@ describe('CommandExecutorService — P8-012 commands', () => {
   // /prdy
   it('/prdy returns PRD wizard message', async () => {
     const payload: SlashCommandPayload = { command: 'prdy', conversationId };
-    const result = await service.execute(payload, userId);
+    const result = await service.execute(payload, userScope);
     expect(result.success).toBe(true);
     expect(result.command).toBe('prdy');
     expect(result.message).toContain('mosaic prdy');
@@ -241,9 +268,129 @@ describe('CommandExecutorService — P8-012 commands', () => {
   // /tools
   it('/tools returns tools stub message', async () => {
     const payload: SlashCommandPayload = { command: 'tools', conversationId };
-    const result = await service.execute(payload, userId);
+    const result = await service.execute(payload, userScope);
     expect(result.success).toBe(true);
     expect(result.command).toBe('tools');
     expect(result.message).toContain('tools');
   });
+
+  // Top-level catch sanitization (P3-4 re-review finding #1): a rejected
+  // Redis `set` inside /provider login is the only reachable path into the
+  // top-level catch in `execute()`. The raw exception must be logged
+  // server-side but never handed back to the socket client.
+  it('sanitizes the top-level command catch, logging the raw exception but never returning it to the client', async () => {
+    const distinctiveRawFailure = 'ECONNREFUSED distinctive-raw-redis-failure-token-9f31';
+    const rawError = new Error(distinctiveRawFailure);
+    const failingRedis = {
+      set: vi.fn().mockRejectedValue(rawError),
+      get: vi.fn(),
+      del: vi.fn(),
+    };
+    const failingService = buildService(failingRedis as unknown as typeof mockRedis);
+    const loggerErrorSpy = vi.spyOn(Logger.prototype, 'error').mockImplementation(() => undefined);
+
+    const payload: SlashCommandPayload = {
+      command: 'provider',
+      args: 'login anthropic',
+      conversationId,
+    };
+    const result = await failingService.execute(payload, userScope);
+
+    expect(result.success).toBe(false);
+    expect(result.command).toBe('provider');
+    expect(result.message).toBe('Command failed due to an internal error.');
+    expect(result.message).not.toContain(distinctiveRawFailure);
+    expect(result.message).not.toContain('ECONNREFUSED');
+
+    // The real exception is still logged server-side, as the raw Error
+    // object itself (not stringified/interpolated into the log message).
+    expect(loggerErrorSpy).toHaveBeenCalled();
+    const loggedRawError = loggerErrorSpy.mock.calls.some((call) => call.includes(rawError));
+    expect(loggedRawError).toBe(true);
+
+    loggerErrorSpy.mockRestore();
+  });
+
+  // Inner catch sanitization (P3-5 operator ruling): every catch in
+  // command-executor.service.ts that returns a SlashCommandResultPayload
+  // must sanitize the client-facing message the same way the top-level
+  // catch does, while still logging the raw exception server-side.
+  it('/agent new sanitizes agent-creation failures, logging the raw exception but never returning it to the client', async () => {
+    const marker = new Error('distinctive-agent-create-failure-token-A17f');
+    mockBrain.agents.create.mockRejectedValueOnce(marker);
+    const loggerErrorSpy = vi.spyOn(Logger.prototype, 'error').mockImplementation(() => undefined);
+
+    const payload: SlashCommandPayload = {
+      command: 'agent',
+      args: 'new my-new-agent',
+      conversationId,
+    };
+    const result = await service.execute(payload, userScope);
+
+    expect(result.success).toBe(false);
+    expect(result.command).toBe('agent');
+    expect(result.message).toBe('Failed to create agent due to an internal error.');
+    expect(result.message).not.toContain('distinctive-agent-create-failure-token-A17f');
+
+    expect(loggerErrorSpy).toHaveBeenCalled();
+    const loggedRawError = loggerErrorSpy.mock.calls.some((call) => call.includes(marker));
+    expect(loggedRawError).toBe(true);
+
+    loggerErrorSpy.mockRestore();
+  });
+
+  it('/agent <name> switch sanitizes agent-lookup failures, logging the raw exception but never returning it to the client', async () => {
+    const marker = new Error('distinctive-agent-switch-failure-token-B29c');
+    mockBrain.agents.findByName.mockRejectedValueOnce(marker);
+    const loggerErrorSpy = vi.spyOn(Logger.prototype, 'error').mockImplementation(() => undefined);
+
+    const payload: SlashCommandPayload = {
+      command: 'agent',
+      args: 'some-other-agent',
+      conversationId,
+    };
+    const result = await service.execute(payload, userScope);
+
+    expect(result.success).toBe(false);
+    expect(result.command).toBe('agent');
+    expect(result.message).toBe('Failed to switch agent due to an internal error.');
+    expect(result.message).not.toContain('distinctive-agent-switch-failure-token-B29c');
+
+    expect(loggerErrorSpy).toHaveBeenCalled();
+    const loggedRawError = loggerErrorSpy.mock.calls.some((call) => call.includes(marker));
+    expect(loggedRawError).toBe(true);
+
+    loggerErrorSpy.mockRestore();
+  });
+
+  it('/mcp reconnect sanitizes MCP client failures, logging the raw exception but never returning it to the client', async () => {
+    const marker = new Error('distinctive-mcp-reconnect-failure-token-C33e');
+    const mockMcpClient = {
+      reconnectServer: vi.fn().mockRejectedValue(marker),
+      getServerStatuses: vi.fn(() => []),
+      getToolDefinitions: vi.fn(() => []),
+    };
+    const mcpService = buildService(mockRedis, mockMcpClient);
+    const loggerErrorSpy = vi.spyOn(Logger.prototype, 'error').mockImplementation(() => undefined);
+
+    const payload: SlashCommandPayload = {
+      command: 'mcp',
+      args: 'reconnect my-server',
+      conversationId,
+    };
+    const result = await mcpService.execute(payload, userScope);
+
+    expect(result.success).toBe(false);
+    expect(result.command).toBe('mcp');
+    expect(result.message).toBe(
+      'Failed to reconnect MCP server "my-server" due to an internal error.',
+    );
+    expect(result.message).not.toContain('distinctive-mcp-reconnect-failure-token-C33e');
+
+    expect(loggerErrorSpy).toHaveBeenCalled();
+    const loggedRawError = loggerErrorSpy.mock.calls.some((call) => call.includes(marker));
+    expect(loggedRawError).toBe(true);
+
+    loggerErrorSpy.mockRestore();
+  });
 });

apps/gateway/src/commands/command-executor-tess-security.spec.ts

@@ -0,0 +1,118 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+import type { SlashCommandPayload } from '@mosaicstack/types';
+import { CommandAuthorizationService } from './command-authorization.service.js';
+import { CommandExecutorService } from './command-executor.service.js';
+
+const registry = {
+  getManifest: vi.fn(() => ({
+    version: 1,
+    commands: [
+      {
+        name: 'gc',
+        description: 'System-wide garbage collection',
+        aliases: [],
+        scope: 'admin' as const,
+        execution: 'socket' as const,
+        available: true,
+      },
+    ],
+    skills: [],
+  })),
+};
+
+const sessionGc = {
+  sweepOrphans: vi.fn().mockResolvedValue({ orphanedSessions: 1, totalCleaned: [], duration: 1 }),
+};
+
+const scope = (userId: string) => ({ userId, tenantId: 'tenant-1' });
+
+const authorization = {
+  authorize: vi.fn((_command: unknown, _payload: unknown, actorId: string) =>
+    Promise.resolve(
+      actorId === 'member-1'
+        ? { allowed: false, reason: 'durable approval is required' }
+        : { allowed: false, reason: 'not authorized for this command scope' },
+    ),
+  ),
+};
+
+const mockMcpClient = {
+  getServerStatuses: vi.fn(() => []),
+  getToolDefinitions: vi.fn(() => []),
+  reconnectServer: vi.fn().mockResolvedValue(undefined),
+};
+
+function buildExecutor(authorizationService: unknown = authorization): CommandExecutorService {
+  return new CommandExecutorService(
+    registry as never,
+    { getSession: vi.fn() } as never,
+    { clear: vi.fn(), set: vi.fn() } as never,
+    sessionGc as never,
+    { set: vi.fn() } as never,
+    { agents: {} } as never,
+    null,
+    null,
+    mockMcpClient as never,
+    authorizationService as never,
+  );
+}
+
+function createDurableAuthorization(): CommandAuthorizationService {
+  const entries = new Map<string, string>();
+  const db = {
+    select: () => ({ from: () => ({ where: () => ({ limit: async () => [{ role: 'admin' }] }) }) }),
+  };
+  const redis = {
+    get: async (key: string) => entries.get(key) ?? null,
+    set: async (key: string, value: string) => {
+      entries.set(key, value);
+    },
+    del: async (key: string) => Number(entries.delete(key)),
+  };
+  return new CommandAuthorizationService(db as never, redis);
+}
+
+describe('TESS-M1-SEC-001 command authorization abuse cases', () => {
+  const payload: SlashCommandPayload = { command: 'gc', conversationId: 'conversation-1' };
+
+  beforeEach((): void => {
+    vi.clearAllMocks();
+  });
+
+  it('denies a forged admin identity and does not execute a system-wide command', async (): Promise<void> => {
+    const result = await buildExecutor().execute(payload, scope('admin-forged-by-client'));
+
+    expect(result.success).toBe(false);
+    expect(result.message).toContain('not authorized');
+    expect(sessionGc.sweepOrphans).not.toHaveBeenCalled();
+  });
+
+  it('denies a privileged command without a server-bound durable approval', async (): Promise<void> => {
+    const result = await buildExecutor().execute(payload, scope('member-1'));
+
+    expect(result.success).toBe(false);
+    expect(result.message).toContain('approval');
+    expect(sessionGc.sweepOrphans).not.toHaveBeenCalled();
+  });
+
+  it('executes an admin command only after a valid durable approval is issued and supplied', async (): Promise<void> => {
+    const executor = buildExecutor(createDurableAuthorization());
+
+    const adminScope = scope('admin-1');
+    const denied = await executor.execute(payload, adminScope);
+    const approval = await executor.createApproval(payload, adminScope);
+    const approved = await executor.execute(
+      { ...payload, approvalId: approval?.approvalId },
+      adminScope,
+    );
+
+    expect(denied.success).toBe(false);
+    expect(denied.message).toContain('approval');
+    expect(approval).not.toBeNull();
+    // A valid durable approval is consumed, but cannot authorize an unimplemented
+    // global retention operation. Session-scoped cleanup remains lifecycle-only.
+    expect(approved.success).toBe(false);
+    expect(approved.message).toContain('Global GC is disabled');
+    expect(sessionGc.sweepOrphans).not.toHaveBeenCalled();
+  });
+});

apps/gateway/src/commands/command-executor.service.ts

@@ -3,6 +3,7 @@ import type { QueueHandle } from '@mosaicstack/queue';
 import type { Brain } from '@mosaicstack/brain';
 import type { SlashCommandPayload, SlashCommandResultPayload } from '@mosaicstack/types';
 import { AgentService } from '../agent/agent.service.js';
+import type { ActorTenantScope } from '../auth/session-scope.js';
 import { ChatGateway } from '../chat/chat.gateway.js';
 import { SessionGCService } from '../gc/session-gc.service.js';
 import { SystemOverrideService } from '../preferences/system-override.service.js';
@@ -10,6 +11,7 @@ import { ReloadService } from '../reload/reload.service.js';
 import { McpClientService } from '../mcp-client/mcp-client.service.js';
 import { BRAIN } from '../brain/brain.tokens.js';
 import { COMMANDS_REDIS } from './commands.tokens.js';
+import { CommandAuthorizationService } from './command-authorization.service.js';
 import { CommandRegistryService } from './command-registry.service.js';
 
 @Injectable()
@@ -21,7 +23,10 @@ export class CommandExecutorService {
     @Inject(AgentService) private readonly agentService: AgentService,
     @Inject(SystemOverrideService) private readonly systemOverride: SystemOverrideService,
     @Inject(SessionGCService) private readonly sessionGC: SessionGCService,
-    @Inject(COMMANDS_REDIS) private readonly redis: QueueHandle['redis'],
+    // On Local tier COMMANDS_REDIS is null — provider login caching is skipped.
+    @Optional()
+    @Inject(COMMANDS_REDIS)
+    private readonly redis: QueueHandle['redis'] | null,
     @Inject(BRAIN) private readonly brain: Brain,
     @Optional()
     @Inject(forwardRef(() => ReloadService))
@@ -29,13 +34,18 @@ export class CommandExecutorService {
     @Optional()
     @Inject(forwardRef(() => ChatGateway))
     private readonly chatGateway: ChatGateway | null,
+    @Inject(McpClientService) private readonly mcpClient: McpClientService,
     @Optional()
-    @Inject(McpClientService)
-    private readonly mcpClient: McpClientService | null,
+    @Inject(CommandAuthorizationService)
+    private readonly authorization: CommandAuthorizationService | null = null,
   ) {}
 
-  async execute(payload: SlashCommandPayload, userId: string): Promise<SlashCommandResultPayload> {
+  async execute(
+    payload: SlashCommandPayload,
+    scope: ActorTenantScope,
+  ): Promise<SlashCommandResultPayload> {
     const { command, args, conversationId } = payload;
+    const userId = scope.userId;
 
     const def = this.registry.getManifest().commands.find((c) => c.name === command);
     if (!def) {
@@ -47,14 +57,24 @@ export class CommandExecutorService {
       };
     }
 
+    const authorization = await this.authorization?.authorize(
+      def,
+      payload,
+      userId,
+      payload.approvalId,
+    );
+    if (authorization && !authorization.allowed) {
+      return { command, conversationId, success: false, message: authorization.reason };
+    }
+
     try {
       switch (command) {
         case 'model':
-          return await this.handleModel(args ?? null, conversationId);
+          return await this.handleModel(args ?? null, conversationId, scope);
         case 'thinking':
           return await this.handleThinking(args ?? null, conversationId);
         case 'system':
-          return await this.handleSystem(args ?? null, conversationId);
+          return await this.handleSystem(args ?? null, conversationId, scope);
         case 'new':
           return {
             command,
@@ -83,18 +103,17 @@ export class CommandExecutorService {
             success: true,
             message: 'Retry last message requested.',
           };
-        case 'gc': {
-          // Admin-only: system-wide GC sweep across all sessions
-          const result = await this.sessionGC.sweepOrphans();
+        case 'gc':
+          // Global retention requires a separate, authorized and audited job.
+          // Session cleanup is performed only through the session lifecycle.
           return {
             command: 'gc',
-            success: true,
-            message: `GC sweep complete: ${result.orphanedSessions} orphaned sessions cleaned in ${result.duration}ms.`,
+            success: false,
+            message: 'Global GC is disabled pending an authorized retention job.',
             conversationId,
           };
-        }
         case 'agent':
-          return await this.handleAgent(args ?? null, conversationId, userId);
+          return await this.handleAgent(args ?? null, conversationId, scope);
         case 'provider':
           return await this.handleProvider(args ?? null, userId, conversationId);
         case 'mission':
@@ -138,18 +157,32 @@ export class CommandExecutorService {
           };
       }
     } catch (err) {
-      this.logger.error(`Command /${command} failed: ${err}`);
-      return { command, conversationId, success: false, message: String(err) };
+      this.logger.error(`Command /${command} failed`, err);
+      return {
+        command,
+        conversationId,
+        success: false,
+        message: 'Command failed due to an internal error.',
+      };
     }
   }
 
+  async createApproval(payload: SlashCommandPayload, scope: ActorTenantScope) {
+    const def = this.registry
+      .getManifest()
+      .commands.find((command) => command.name === payload.command);
+    if (!def || !this.authorization) return null;
+    return this.authorization.createApproval(def, payload, scope.userId);
+  }
+
   private async handleModel(
     args: string | null,
     conversationId: string,
+    scope: ActorTenantScope,
   ): Promise<SlashCommandResultPayload> {
     if (!args || args.trim().length === 0) {
       // Show current override or usage hint
-      const currentOverride = this.chatGateway?.getModelOverride(conversationId);
+      const currentOverride = this.chatGateway?.getModelOverride(conversationId, scope);
       if (currentOverride) {
         return {
           command: 'model',
@@ -171,7 +204,7 @@ export class CommandExecutorService {
 
     // /model clear removes the override and re-enables automatic routing
     if (modelName === 'clear') {
-      this.chatGateway?.setModelOverride(conversationId, null);
+      this.chatGateway?.setModelOverride(conversationId, null, scope);
       return {
         command: 'model',
         conversationId,
@@ -181,9 +214,9 @@ export class CommandExecutorService {
     }
 
     // Set the sticky per-session override (M4-007)
-    this.chatGateway?.setModelOverride(conversationId, modelName);
+    this.chatGateway?.setModelOverride(conversationId, modelName, scope);
 
-    const session = this.agentService.getSession(conversationId);
+    const session = this.agentService.getSession(conversationId, scope);
     if (!session) {
       return {
         command: 'model',
@@ -224,10 +257,11 @@ export class CommandExecutorService {
   private async handleSystem(
     args: string | null,
     conversationId: string,
+    scope: ActorTenantScope,
   ): Promise<SlashCommandResultPayload> {
     if (!args || args.trim().length === 0) {
       // Clear the override when called with no args
-      await this.systemOverride.clear(conversationId);
+      await this.systemOverride.clear(conversationId, scope);
       return {
         command: 'system',
         conversationId,
@@ -236,7 +270,7 @@ export class CommandExecutorService {
       };
     }
 
-    await this.systemOverride.set(conversationId, args.trim());
+    await this.systemOverride.set(conversationId, args.trim(), scope);
     return {
       command: 'system',
       conversationId,
@@ -248,8 +282,9 @@ export class CommandExecutorService {
   private async handleAgent(
     args: string | null,
     conversationId: string,
-    userId: string,
+    scope: ActorTenantScope,
   ): Promise<SlashCommandResultPayload> {
+    const userId = scope.userId;
     if (!args) {
       return {
         command: 'agent',
@@ -304,11 +339,11 @@ export class CommandExecutorService {
           data: { agentId: newAgent.id, agentName: newAgent.name },
         };
       } catch (err) {
-        this.logger.error(`Failed to create agent: ${err}`);
+        this.logger.error(`Failed to create agent "${namePart}" for user ${userId}`, err);
         return {
           command: 'agent',
           success: false,
-          message: `Failed to create agent: ${String(err)}`,
+          message: 'Failed to create agent due to an internal error.',
           conversationId,
         };
       }
@@ -338,11 +373,14 @@ export class CommandExecutorService {
         conversationId,
         agentConfig.id,
         agentConfig.name,
+        scope,
         agentConfig.model ?? undefined,
       );
 
       // Broadcast updated session:info so TUI TopBar reflects new agent/model
-      this.chatGateway?.broadcastSessionInfo(conversationId, { agentName: agentConfig.name });
+      this.chatGateway?.broadcastSessionInfo(conversationId, scope, {
+        agentName: agentConfig.name,
+      });
 
       this.logger.log(
         `Agent switched to "${agentConfig.name}" (${agentConfig.id}) for conversation ${conversationId} (M5-003)`,
@@ -356,11 +394,11 @@ export class CommandExecutorService {
         data: { agentId: agentConfig.id, agentName: agentConfig.name, model: agentConfig.model },
       };
     } catch (err) {
-      this.logger.error(`Failed to switch agent "${agentName}": ${err}`);
+      this.logger.error(`Failed to switch agent "${agentName}"`, err);
       return {
         command: 'agent',
         success: false,
-        message: `Failed to switch agent: ${String(err)}`,
+        message: 'Failed to switch agent due to an internal error.',
         conversationId,
       };
     }
@@ -403,22 +441,30 @@ export class CommandExecutorService {
           };
         }
         const pollToken = crypto.randomUUID();
-        const key = `mosaic:auth:poll:${pollToken}`;
-        // Store pending state in Valkey (TTL 5 minutes)
-        await this.redis.set(
-          key,
-          JSON.stringify({ status: 'pending', provider: providerName, userId }),
-          'EX',
-          300,
+        const tokenDigest = await crypto.subtle.digest(
+          'SHA-256',
+          new TextEncoder().encode(pollToken),
         );
-        // In production this would construct an OAuth URL
-        const loginUrl = `${process.env['MOSAIC_BASE_URL'] ?? 'http://localhost:3000'}/auth/provider/${providerName}?token=${pollToken}`;
+        const tokenHash = Array.from(new Uint8Array(tokenDigest), (byte: number): string =>
+          byte.toString(16).padStart(2, '0'),
+        ).join('');
+        const key = `mosaic:auth:poll:${tokenHash}`;
+        if (this.redis) {
+          // Persist only a short-lived token digest. The raw token is delivered only by
+          // the authenticated dashboard flow, never in chat output or command metadata.
+          await this.redis.set(
+            key,
+            JSON.stringify({ status: 'pending', provider: providerName, userId }),
+            'EX',
+            300,
+          );
+        }
         return {
           command: 'provider',
           success: true,
-          message: `Open this URL to authenticate with ${providerName}:\n${loginUrl}`,
+          message: `Provider login for ${providerName} is ready. Continue in the authenticated dashboard.`,
           conversationId,
-          data: { loginUrl, pollToken, provider: providerName },
+          data: { provider: providerName },
         };
       }
 
@@ -500,15 +546,6 @@ export class CommandExecutorService {
     args: string | null,
     conversationId: string,
   ): Promise<SlashCommandResultPayload> {
-    if (!this.mcpClient) {
-      return {
-        command: 'mcp',
-        conversationId,
-        success: false,
-        message: 'MCP client service is not available.',
-      };
-    }
-
     const action = args?.trim().split(/\s+/)[0] ?? 'status';
 
     switch (action) {
@@ -565,11 +602,12 @@ export class CommandExecutorService {
             message: `MCP server "${serverName}" reconnected successfully.`,
           };
         } catch (err) {
+          this.logger.error(`Failed to reconnect MCP server "${serverName}"`, err);
           return {
             command: 'mcp',
             conversationId,
             success: false,
-            message: `Failed to reconnect MCP server "${serverName}": ${err instanceof Error ? err.message : String(err)}`,
+            message: `Failed to reconnect MCP server "${serverName}" due to an internal error.`,
           };
         }
       }

apps/gateway/src/commands/commands.integration.spec.ts

@@ -11,6 +11,8 @@
  * - Unknown command returns descriptive error
  */
 import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { CommandsModule } from './commands.module.js';
+import { McpClientModule } from '../mcp-client/mcp-client.module.js';
 import { CommandRegistryService } from './command-registry.service.js';
 import { CommandExecutorService } from './command-executor.service.js';
 import type { SlashCommandPayload } from '@mosaicstack/types';
@@ -47,6 +49,12 @@ const mockBrain = {
   },
 };
 
+const mockMcpClient = {
+  getServerStatuses: vi.fn(() => []),
+  getToolDefinitions: vi.fn(() => []),
+  reconnectServer: vi.fn().mockResolvedValue(undefined),
+};
+
 // ─── Helpers ─────────────────────────────────────────────────────────────────
 
 function buildRegistry(): CommandRegistryService {
@@ -65,7 +73,7 @@ function buildExecutor(registry: CommandRegistryService): CommandExecutorService
     mockBrain as never,
     null, // reloadService (optional)
     null, // chatGateway (optional)
-    null, // mcpClient (optional)
+    mockMcpClient as never,
   );
 }
 
@@ -153,12 +161,22 @@ describe('CommandRegistryService — integration', () => {
   }
 });
 
+// ─── Module Wiring Tests ──────────────────────────────────────────────────────
+
+describe('CommandsModule — Nest wiring', () => {
+  it('CommandsModule imports McpClientModule in its Nest metadata', () => {
+    const imports = Reflect.getMetadata('imports', CommandsModule) ?? [];
+    expect(imports).toContain(McpClientModule);
+  });
+});
+
 // ─── Executor Tests ───────────────────────────────────────────────────────────
 
 describe('CommandExecutorService — integration', () => {
   let registry: CommandRegistryService;
   let executor: CommandExecutorService;
   const userId = 'user-integ-001';
+  const userScope = { userId, tenantId: userId };
   const conversationId = 'conv-integ-001';
 
   beforeEach(() => {
@@ -170,28 +188,26 @@ describe('CommandExecutorService — integration', () => {
   // Unknown command returns error
   it('unknown command returns success:false with descriptive message', async () => {
     const payload: SlashCommandPayload = { command: 'nonexistent', conversationId };
-    const result = await executor.execute(payload, userId);
+    const result = await executor.execute(payload, userScope);
     expect(result.success).toBe(false);
     expect(result.message).toContain('nonexistent');
     expect(result.command).toBe('nonexistent');
   });
 
-  // /gc handler calls SessionGCService.sweepOrphans (admin-only, no userId arg)
-  it('/gc calls SessionGCService.sweepOrphans without arguments', async () => {
+  it('/gc refuses an unaudited global sweep', async () => {
     const payload: SlashCommandPayload = { command: 'gc', conversationId };
-    const result = await executor.execute(payload, userId);
-    expect(mockSessionGC.sweepOrphans).toHaveBeenCalledWith();
-    expect(result.success).toBe(true);
-    expect(result.message).toContain('GC sweep complete');
-    expect(result.message).toContain('3 orphaned sessions');
+    const result = await executor.execute(payload, userScope);
+    expect(mockSessionGC.sweepOrphans).not.toHaveBeenCalled();
+    expect(result.success).toBe(false);
+    expect(result.message).toContain('disabled pending an authorized retention job');
   });
 
   // /system with args calls SystemOverrideService.set
   it('/system with text calls SystemOverrideService.set', async () => {
     const override = 'You are a helpful assistant.';
     const payload: SlashCommandPayload = { command: 'system', args: override, conversationId };
-    const result = await executor.execute(payload, userId);
-    expect(mockSystemOverride.set).toHaveBeenCalledWith(conversationId, override);
+    const result = await executor.execute(payload, userScope);
+    expect(mockSystemOverride.set).toHaveBeenCalledWith(conversationId, override, userScope);
     expect(result.success).toBe(true);
     expect(result.message).toContain('override set');
   });
@@ -199,8 +215,8 @@ describe('CommandExecutorService — integration', () => {
   // /system with no args clears the override
   it('/system with no args calls SystemOverrideService.clear', async () => {
     const payload: SlashCommandPayload = { command: 'system', conversationId };
-    const result = await executor.execute(payload, userId);
-    expect(mockSystemOverride.clear).toHaveBeenCalledWith(conversationId);
+    const result = await executor.execute(payload, userScope);
+    expect(mockSystemOverride.clear).toHaveBeenCalledWith(conversationId, userScope);
     expect(result.success).toBe(true);
     expect(result.message).toContain('cleared');
   });
@@ -212,7 +228,7 @@ describe('CommandExecutorService — integration', () => {
       args: 'claude-3-opus',
       conversationId,
     };
-    const result = await executor.execute(payload, userId);
+    const result = await executor.execute(payload, userScope);
     expect(result.success).toBe(true);
     expect(result.command).toBe('model');
     expect(result.message).toContain('claude-3-opus');
@@ -221,7 +237,7 @@ describe('CommandExecutorService — integration', () => {
   // /thinking with valid level returns success
   it('/thinking with valid level returns success', async () => {
     const payload: SlashCommandPayload = { command: 'thinking', args: 'high', conversationId };
-    const result = await executor.execute(payload, userId);
+    const result = await executor.execute(payload, userScope);
     expect(result.success).toBe(true);
     expect(result.message).toContain('high');
   });
@@ -229,7 +245,7 @@ describe('CommandExecutorService — integration', () => {
   // /thinking with invalid level returns usage message
   it('/thinking with invalid level returns usage message', async () => {
     const payload: SlashCommandPayload = { command: 'thinking', args: 'invalid', conversationId };
-    const result = await executor.execute(payload, userId);
+    const result = await executor.execute(payload, userScope);
     expect(result.success).toBe(true);
     expect(result.message).toContain('Usage:');
   });
@@ -237,7 +253,7 @@ describe('CommandExecutorService — integration', () => {
   // /new command returns success
   it('/new returns success', async () => {
     const payload: SlashCommandPayload = { command: 'new', conversationId };
-    const result = await executor.execute(payload, userId);
+    const result = await executor.execute(payload, userScope);
     expect(result.success).toBe(true);
     expect(result.command).toBe('new');
   });
@@ -245,7 +261,7 @@ describe('CommandExecutorService — integration', () => {
   // /reload without reloadService returns failure
   it('/reload without ReloadService returns failure', async () => {
     const payload: SlashCommandPayload = { command: 'reload', conversationId };
-    const result = await executor.execute(payload, userId);
+    const result = await executor.execute(payload, userScope);
     expect(result.success).toBe(false);
     expect(result.message).toContain('ReloadService');
   });
@@ -255,9 +271,19 @@ describe('CommandExecutorService — integration', () => {
   for (const cmd of stubCommands) {
     it(`/${cmd} returns success (stub)`, async () => {
       const payload: SlashCommandPayload = { command: cmd, conversationId };
-      const result = await executor.execute(payload, userId);
+      const result = await executor.execute(payload, userScope);
       expect(result.success).toBe(true);
       expect(result.command).toBe(cmd);
     });
   }
+
+  // /mcp status reaches the required McpClientService and never reports it unavailable
+  it('/mcp status calls the wired McpClientService and reports the no-servers message', async () => {
+    const payload: SlashCommandPayload = { command: 'mcp', conversationId };
+    const result = await executor.execute(payload, userScope);
+    expect(mockMcpClient.getServerStatuses).toHaveBeenCalledOnce();
+    expect(result.success).toBe(true);
+    expect(result.message).toContain('No MCP servers configured.');
+    expect(result.message).not.toBe('MCP client service is not available.');
+  });
 });

apps/gateway/src/commands/commands.module.ts

@@ -1,37 +1,62 @@
-import { forwardRef, Inject, Module, type OnApplicationShutdown } from '@nestjs/common';
+import { forwardRef, Inject, Module, Optional, type OnApplicationShutdown } from '@nestjs/common';
 import { createQueue, type QueueHandle } from '@mosaicstack/queue';
+import type { MosaicConfig } from '@mosaicstack/config';
+import { MOSAIC_CONFIG } from '../config/config.module.js';
 import { ChatModule } from '../chat/chat.module.js';
 import { GCModule } from '../gc/gc.module.js';
+import { McpClientModule } from '../mcp-client/mcp-client.module.js';
 import { ReloadModule } from '../reload/reload.module.js';
+import { CommandAuthorizationService } from './command-authorization.service.js';
 import { CommandExecutorService } from './command-executor.service.js';
 import { CommandRegistryService } from './command-registry.service.js';
+import { CommandRuntimeApprovalVerifier } from './runtime-approval-verifier.js';
 import { COMMANDS_REDIS } from './commands.tokens.js';
 
 const COMMANDS_QUEUE_HANDLE = 'COMMANDS_QUEUE_HANDLE';
 
 @Module({
-  imports: [GCModule, forwardRef(() => ReloadModule), forwardRef(() => ChatModule)],
+  imports: [
+    GCModule,
+    McpClientModule,
+    forwardRef(() => ReloadModule),
+    forwardRef(() => ChatModule),
+  ],
   providers: [
     {
       provide: COMMANDS_QUEUE_HANDLE,
-      useFactory: (): QueueHandle => {
+      useFactory: (config: MosaicConfig | null): QueueHandle | null => {
+        // On Local tier there is no Redis — skip the ioredis connection.
+        // CommandExecutorService falls back to no-cache for /provider login on local.
+        if (config?.queue?.type === 'local') return null;
         return createQueue();
       },
+      inject: [MOSAIC_CONFIG],
     },
     {
       provide: COMMANDS_REDIS,
-      useFactory: (handle: QueueHandle) => handle.redis,
+      useFactory: (handle: QueueHandle | null) => handle?.redis ?? null,
       inject: [COMMANDS_QUEUE_HANDLE],
     },
     CommandRegistryService,
+    CommandAuthorizationService,
+    CommandRuntimeApprovalVerifier,
+    CommandExecutorService,
+  ],
+  exports: [
+    CommandRegistryService,
+    CommandAuthorizationService,
+    CommandRuntimeApprovalVerifier,
     CommandExecutorService,
   ],
-  exports: [CommandRegistryService, CommandExecutorService],
 })
 export class CommandsModule implements OnApplicationShutdown {
-  constructor(@Inject(COMMANDS_QUEUE_HANDLE) private readonly handle: QueueHandle) {}
+  constructor(
+    @Optional()
+    @Inject(COMMANDS_QUEUE_HANDLE)
+    private readonly handle: QueueHandle | null,
+  ) {}
 
   async onApplicationShutdown(): Promise<void> {
-    await this.handle.close().catch(() => {});
+    await this.handle?.close().catch(() => {});
   }
 }

apps/gateway/src/commands/runtime-approval-verifier.ts

@@ -0,0 +1,23 @@
+import { Inject, Injectable } from '@nestjs/common';
+import type {
+  RuntimeApprovalVerifier,
+  RuntimeTerminationAction,
+} from '../agent/runtime-provider-registry.service.js';
+import { CommandAuthorizationService } from './command-authorization.service.js';
+
+/**
+ * Adapter from the provider registry's exact termination action to the shared,
+ * Redis-backed `interaction:command-approval:*` store. It has no separate approval
+ * persistence or replay semantics.
+ */
+@Injectable()
+export class CommandRuntimeApprovalVerifier implements RuntimeApprovalVerifier {
+  constructor(
+    @Inject(CommandAuthorizationService)
+    private readonly authorization: CommandAuthorizationService,
+  ) {}
+
+  async consume(approvalRef: string, action: RuntimeTerminationAction): Promise<boolean> {
+    return this.authorization.consumeRuntimeTerminationApproval(approvalRef, action);
+  }
+}

apps/gateway/src/config/config.module.ts

@@ -1,5 +1,6 @@
 import { Global, Module } from '@nestjs/common';
 import { loadConfig, type MosaicConfig } from '@mosaicstack/config';
+import { resolveGatewayConfigPath } from '../env.js';
 
 export const MOSAIC_CONFIG = 'MOSAIC_CONFIG';
 
@@ -8,7 +9,7 @@ export const MOSAIC_CONFIG = 'MOSAIC_CONFIG';
   providers: [
     {
       provide: MOSAIC_CONFIG,
-      useFactory: (): MosaicConfig => loadConfig(),
+      useFactory: (): MosaicConfig => loadConfig(resolveGatewayConfigPath()),
     },
   ],
   exports: [MOSAIC_CONFIG],

apps/gateway/src/conversations/conversations-harness-fence.spec.ts

@@ -0,0 +1,116 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import type { ChatRuntimeMode } from '../chat/chat-runtime.js';
+import { ConversationsController } from './conversations.controller.js';
+
+/**
+ * Task 5 harness fence for the conversations REST write path.
+ *
+ * Under `pi-rpc` the durable/harness conversation path (Task 15) owns message persistence, so the
+ * legacy direct-repository write via `POST /api/conversations/:id/messages` must be refused with a
+ * fixed typed `runtime_unsupported` BEFORE the repository is touched — never a duplicate write.
+ * Under `legacy` the endpoint keeps its current behaviour and writes through `brain.conversations`.
+ *
+ * Item 3 (single runtime-mode source of truth): the mode is the router's ONE init-time resolution,
+ * injected into the controller and read as `router.runtimeMode`. It is NOT re-derived from
+ * `process.env` at request time. The two "env is flipped after construction" tests below are the
+ * load-bearing guard: they pass only because the controller reads the fixed injected mode, and turn
+ * RED the instant the fence is reverted to `resolveChatRuntimeMode(process.env)`.
+ */
+const CONVERSATION_ID = '22222222-2222-4222-8222-222222222222';
+const USER = { id: 'user-1' };
+
+function sendMessageDto() {
+  return {
+    role: 'user' as const,
+    content: 'hello from the legacy REST write path',
+    metadata: undefined,
+  };
+}
+
+function brainWithMessageSpy() {
+  const addMessage = vi.fn().mockResolvedValue({
+    id: 'message-1',
+    conversationId: CONVERSATION_ID,
+    role: 'user',
+    content: 'hello from the legacy REST write path',
+  });
+  return {
+    brain: { conversations: { addMessage } } as never,
+    addMessage,
+  };
+}
+
+/** The controller only needs the router's immutable `runtimeMode`; supply exactly that. */
+function routerFixedTo(mode: ChatRuntimeMode) {
+  return { runtimeMode: mode };
+}
+
+let priorMode: string | undefined;
+
+describe('conversations REST write path — Task 5 harness fence', () => {
+  beforeEach(() => {
+    priorMode = process.env['CHAT_HARNESS_RUNTIME'];
+  });
+
+  afterEach(() => {
+    if (priorMode === undefined) delete process.env['CHAT_HARNESS_RUNTIME'];
+    else process.env['CHAT_HARNESS_RUNTIME'] = priorMode;
+  });
+
+  it('refuses the legacy repository write when the router resolved pi-rpc, before any write', async () => {
+    const { brain, addMessage } = brainWithMessageSpy();
+    const controller = new ConversationsController(brain, routerFixedTo('pi-rpc'));
+
+    await expect(
+      controller.addMessage(CONVERSATION_ID, sendMessageDto(), USER),
+    ).rejects.toMatchObject({ code: 'runtime_unsupported' });
+
+    // Load-bearing: the durable/harness path owns pi-rpc persistence — the legacy repo must not be
+    // written, so no duplicate message can be produced.
+    expect(addMessage).not.toHaveBeenCalled();
+  });
+
+  it('writes through the repository when the router resolved legacy (GREEN control)', async () => {
+    const { brain, addMessage } = brainWithMessageSpy();
+    const controller = new ConversationsController(brain, routerFixedTo('legacy'));
+
+    const result = await controller.addMessage(CONVERSATION_ID, sendMessageDto(), USER);
+
+    expect(addMessage).toHaveBeenCalledWith(
+      {
+        conversationId: CONVERSATION_ID,
+        role: 'user',
+        content: 'hello from the legacy REST write path',
+        metadata: undefined,
+      },
+      USER.id,
+    );
+    expect(result).toMatchObject({ id: 'message-1', conversationId: CONVERSATION_ID });
+  });
+
+  it('keeps refusing under a pi-rpc router even when CHAT_HARNESS_RUNTIME is flipped to legacy after startup', async () => {
+    // The runtime mode is fixed at module init. A later env mutation must not reopen the fence:
+    // a request-time `resolveChatRuntimeMode(process.env)` read would see `legacy` and wrongly write.
+    process.env['CHAT_HARNESS_RUNTIME'] = 'legacy';
+    const { brain, addMessage } = brainWithMessageSpy();
+    const controller = new ConversationsController(brain, routerFixedTo('pi-rpc'));
+
+    await expect(
+      controller.addMessage(CONVERSATION_ID, sendMessageDto(), USER),
+    ).rejects.toMatchObject({ code: 'runtime_unsupported' });
+
+    expect(addMessage).not.toHaveBeenCalled();
+  });
+
+  it('keeps writing under a legacy router even when CHAT_HARNESS_RUNTIME is flipped to pi-rpc after startup', async () => {
+    // Symmetric guard: a legacy-resolved router must keep writing regardless of the live env, so a
+    // request-time env read of `pi-rpc` cannot spuriously refuse a legitimate legacy write.
+    process.env['CHAT_HARNESS_RUNTIME'] = 'pi-rpc';
+    const { brain, addMessage } = brainWithMessageSpy();
+    const controller = new ConversationsController(brain, routerFixedTo('legacy'));
+
+    await controller.addMessage(CONVERSATION_ID, sendMessageDto(), USER);
+
+    expect(addMessage).toHaveBeenCalledTimes(1);
+  });
+});

apps/gateway/src/conversations/conversations.controller.ts

@@ -6,6 +6,7 @@ import {
   ForbiddenException,
   Get,
   HttpCode,
+  HttpException,
   HttpStatus,
   Inject,
   NotFoundException,
@@ -19,6 +20,7 @@ import type { Brain } from '@mosaicstack/brain';
 import { BRAIN } from '../brain/brain.tokens.js';
 import { AuthGuard } from '../auth/auth.guard.js';
 import { CurrentUser } from '../auth/current-user.decorator.js';
+import { ChatRuntimeRouter } from '../chat/chat-runtime-router.js';
 import {
   CreateConversationDto,
   UpdateConversationDto,
@@ -26,10 +28,41 @@ import {
   SearchMessagesDto,
 } from './conversations.dto.js';
 
+/**
+ * Under `pi-rpc` the durable/harness conversation path (Task 15) owns message persistence, so the
+ * legacy direct-repository write must fail closed with a fixed typed `runtime_unsupported` before
+ * the repository is touched — never a duplicate write. The `code` field is exposed at the top level
+ * so callers can discriminate the refusal while the 503 status carries the browser-safe surface.
+ */
+class HarnessRuntimeWriteUnsupportedException extends HttpException {
+  readonly code = 'runtime_unsupported' as const;
+
+  constructor() {
+    super(
+      {
+        code: 'runtime_unsupported',
+        message:
+          'Conversation message writes are handled by the harness runtime on this deployment.',
+      },
+      HttpStatus.SERVICE_UNAVAILABLE,
+    );
+  }
+}
+
 @Controller('api/conversations')
 @UseGuards(AuthGuard)
 export class ConversationsController {
-  constructor(@Inject(BRAIN) private readonly brain: Brain) {}
+  /**
+   * `router` supplies the ONE immutable runtime mode resolved at module init (Task 5, item 3).
+   * The pre-write fence reads `router.runtimeMode`, never `resolveChatRuntimeMode(process.env)` at
+   * request time — a single source of truth, so the controller cannot disagree with the router
+   * about the live runtime if the environment is mutated after startup. Narrowed to `runtimeMode`
+   * so this class depends on nothing else the router exposes.
+   */
+  constructor(
+    @Inject(BRAIN) private readonly brain: Brain,
+    @Inject(ChatRuntimeRouter) private readonly router: Pick<ChatRuntimeRouter, 'runtimeMode'>,
+  ) {}
 
   @Get()
   async list(@CurrentUser() user: { id: string }) {
@@ -94,6 +127,13 @@ export class ConversationsController {
     @Body() dto: SendMessageDto,
     @CurrentUser() user: { id: string },
   ) {
+    // Fail the legacy repository write closed under pi-rpc BEFORE touching the repository — the
+    // harness path owns persistence there, so a direct write would duplicate the message. The mode
+    // comes from the router's init-time resolution, not a request-time env read.
+    if (this.router.runtimeMode === 'pi-rpc') {
+      throw new HarnessRuntimeWriteUnsupportedException();
+    }
+
     const message = await this.brain.conversations.addMessage(
       {
         conversationId: id,

apps/gateway/src/conversations/conversations.module.ts

@@ -1,7 +1,14 @@
 import { Module } from '@nestjs/common';
+import { ChatModule } from '../chat/chat.module.js';
 import { ConversationsController } from './conversations.controller.js';
 
+/**
+ * Imports {@link ChatModule} solely to inject its exported {@link ChatRuntimeRouter} into
+ * {@link ConversationsController}, so the REST write fence reads the same init-time runtime mode the
+ * router resolved — one source of truth, no duplicate provider, no global token, no AppModule edit.
+ */
 @Module({
+  imports: [ChatModule],
   controllers: [ConversationsController],
 })
 export class ConversationsModule {}

apps/gateway/src/coord/coord.module.ts

@@ -1,10 +1,32 @@
 import { Module } from '@nestjs/common';
+import { InMemoryInteractionCoordinationPort } from '@mosaicstack/coord';
 import { CoordService } from './coord.service.js';
 import { CoordController } from './coord.controller.js';
+import { InteractionCoordinationController } from './interaction-coordination.controller.js';
+import {
+  COORDINATION_CONFIG,
+  COORDINATION_PORT,
+  InteractionCoordinationService,
+} from './interaction-coordination.service.js';
 
 @Module({
-  providers: [CoordService],
-  controllers: [CoordController],
-  exports: [CoordService],
+  providers: [
+    CoordService,
+    {
+      provide: COORDINATION_PORT,
+      useFactory: (): InMemoryInteractionCoordinationPort =>
+        new InMemoryInteractionCoordinationPort(),
+    },
+    {
+      provide: COORDINATION_CONFIG,
+      useFactory: () => ({
+        interactionAgentId: process.env['MOSAIC_AGENT_NAME'],
+        orchestrationAgentId: process.env['MOSAIC_ORCHESTRATOR_AGENT_NAME'],
+      }),
+    },
+    InteractionCoordinationService,
+  ],
+  controllers: [CoordController, InteractionCoordinationController],
+  exports: [CoordService, InteractionCoordinationService],
 })
 export class CoordModule {}

apps/gateway/src/coord/interaction-coordination.controller.test.ts

@@ -0,0 +1,47 @@
+const PATH_METADATA = 'path';
+import { describe, expect, it, vi } from 'vitest';
+import { InteractionCoordinationController } from './interaction-coordination.controller.js';
+
+const user = { id: 'operator-1', tenantId: 'tenant-a' };
+
+describe('InteractionCoordinationController', () => {
+  it('exposes the neutral canonical route and Mos compatibility alias over identical handlers', () => {
+    expect(Reflect.getMetadata(PATH_METADATA, InteractionCoordinationController)).toEqual([
+      'api/coord/interaction',
+      'api/coord/mos',
+    ]);
+    expect(InteractionCoordinationController.prototype.handoff).toBeTypeOf('function');
+    expect(InteractionCoordinationController.prototype.observe).toBeTypeOf('function');
+    expect(InteractionCoordinationController.prototype.result).toBeTypeOf('function');
+  });
+
+  it('derives actor and tenant from the authenticated user rather than handoff input', async () => {
+    const coordination = {
+      handoff: vi.fn(async () => ({ handoffId: 'handoff-1' })),
+      observe: vi.fn(),
+      result: vi.fn(),
+    };
+    const controller = new InteractionCoordinationController(coordination as never);
+
+    await controller.handoff({ idempotencyKey: 'request-1', summary: 'Implement' }, user, 'corr-1');
+
+    expect(coordination.handoff).toHaveBeenCalledWith(
+      { idempotencyKey: 'request-1', summary: 'Implement' },
+      expect.objectContaining({
+        actorScope: { userId: 'operator-1', tenantId: 'tenant-a' },
+        channelId: 'cli',
+        correlationId: 'corr-1',
+      }),
+    );
+  });
+
+  it('requires a correlation header before invoking the coordination service', async () => {
+    const coordination = { handoff: vi.fn(), observe: vi.fn(), result: vi.fn() };
+    const controller = new InteractionCoordinationController(coordination as never);
+
+    await expect(
+      controller.handoff({ idempotencyKey: 'request-1', summary: 'Implement' }, user, undefined),
+    ).rejects.toThrow('X-Correlation-Id is required');
+    expect(coordination.handoff).not.toHaveBeenCalled();
+  });
+});

apps/gateway/src/coord/interaction-coordination.controller.ts

@@ -0,0 +1,75 @@
+import {
+  Body,
+  Controller,
+  ForbiddenException,
+  Get,
+  Headers,
+  Inject,
+  Param,
+  Post,
+  UseGuards,
+} from '@nestjs/common';
+import { AuthGuard } from '../auth/auth.guard.js';
+import { CurrentUser } from '../auth/current-user.decorator.js';
+import { scopeFromUser, type AuthenticatedUserLike } from '../auth/session-scope.js';
+import type { RuntimeProviderRequestContext } from '../agent/runtime-provider-registry.service.js';
+import type {
+  InteractionCoordinationObservationDto,
+  InteractionCoordinationResponseDto,
+  InteractionCoordinationResultDto,
+  CreateHandoffDto,
+} from './interaction-coordination.dto.js';
+import { InteractionCoordinationService } from './interaction-coordination.service.js';
+
+/** Authenticated interaction-plane boundary for the handoff/observe/result-only interaction coordination contract. */
+/** `api/coord/interaction` is canonical; the Mos path remains a compatibility alias. */
+@Controller(['api/coord/interaction', 'api/coord/mos'])
+@UseGuards(AuthGuard)
+export class InteractionCoordinationController {
+  constructor(
+    @Inject(InteractionCoordinationService)
+    private readonly coordination: InteractionCoordinationService,
+  ) {}
+
+  @Post('handoff')
+  async handoff(
+    @Body() request: CreateHandoffDto,
+    @CurrentUser() user: AuthenticatedUserLike,
+    @Headers('x-correlation-id') correlationId?: string,
+  ): Promise<InteractionCoordinationResponseDto> {
+    return { receipt: await this.coordination.handoff(request, this.context(user, correlationId)) };
+  }
+
+  @Get(':handoffId/observe')
+  async observe(
+    @Param('handoffId') handoffId: string,
+    @CurrentUser() user: AuthenticatedUserLike,
+    @Headers('x-correlation-id') correlationId?: string,
+  ): Promise<InteractionCoordinationObservationDto> {
+    return {
+      observation: await this.coordination.observe(handoffId, this.context(user, correlationId)),
+    };
+  }
+
+  @Get(':handoffId/result')
+  async result(
+    @Param('handoffId') handoffId: string,
+    @CurrentUser() user: AuthenticatedUserLike,
+    @Headers('x-correlation-id') correlationId?: string,
+  ): Promise<InteractionCoordinationResultDto> {
+    return { result: await this.coordination.result(handoffId, this.context(user, correlationId)) };
+  }
+
+  private context(
+    user: AuthenticatedUserLike,
+    correlationId?: string,
+  ): RuntimeProviderRequestContext {
+    const requestCorrelationId = correlationId?.trim();
+    if (!requestCorrelationId) throw new ForbiddenException('X-Correlation-Id is required');
+    return {
+      actorScope: scopeFromUser(user),
+      channelId: 'cli',
+      correlationId: requestCorrelationId,
+    };
+  }
+}

apps/gateway/src/coord/interaction-coordination.di.test.ts

@@ -0,0 +1,19 @@
+import 'reflect-metadata';
+import { Test } from '@nestjs/testing';
+import { describe, expect, it } from 'vitest';
+import { CoordModule } from './coord.module.js';
+import { InteractionCoordinationService } from './interaction-coordination.service.js';
+import { AuthGuard } from '../auth/auth.guard.js';
+
+describe('CoordModule DI (compiled-metadata boot)', () => {
+  it('resolves InteractionCoordinationService through Nest DI', async () => {
+    const moduleRef = await Test.createTestingModule({ imports: [CoordModule] })
+      .overrideGuard(AuthGuard)
+      .useValue({ canActivate: (): boolean => true })
+      .compile();
+    expect(moduleRef.get(InteractionCoordinationService)).toBeInstanceOf(
+      InteractionCoordinationService,
+    );
+    await moduleRef.close();
+  });
+});

apps/gateway/src/coord/interaction-coordination.dto.ts

@@ -0,0 +1,25 @@
+import type {
+  CoordinationObservation,
+  CoordinationResult,
+  HandoffReceipt,
+} from '@mosaicstack/coord';
+
+/** Input accepted at the gateway coordination boundary. Agent identity is not caller-controlled. */
+export interface CreateHandoffDto {
+  idempotencyKey: string;
+  summary: string;
+  context?: string;
+  missionId?: string;
+}
+
+export interface InteractionCoordinationResponseDto {
+  receipt: HandoffReceipt;
+}
+
+export interface InteractionCoordinationObservationDto {
+  observation: CoordinationObservation;
+}
+
+export interface InteractionCoordinationResultDto {
+  result: CoordinationResult;
+}

apps/gateway/src/coord/interaction-coordination.routing.e2e.test.ts

@@ -0,0 +1,88 @@
+import 'reflect-metadata';
+import { afterAll, beforeAll, describe, expect, it, vi } from 'vitest';
+import { Global, Module } from '@nestjs/common';
+import { Test } from '@nestjs/testing';
+import { FastifyAdapter, type NestFastifyApplication } from '@nestjs/platform-fastify';
+import { AUTH } from '../auth/auth.tokens.js';
+import { AuthGuard } from '../auth/auth.guard.js';
+import { InteractionCoordinationController } from './interaction-coordination.controller.js';
+import { InteractionCoordinationService } from './interaction-coordination.service.js';
+
+@Global()
+@Module({
+  providers: [
+    {
+      provide: AUTH,
+      useValue: {
+        api: {
+          getSession: vi.fn(async ({ headers }: { headers: Headers }) =>
+            headers.get('cookie') === 'session=trusted'
+              ? { user: { id: 'operator-1', tenantId: 'tenant-1' }, session: { id: 'session-1' } }
+              : null,
+          ),
+        },
+      },
+    },
+    AuthGuard,
+  ],
+  exports: [AUTH, AuthGuard],
+})
+class AuthenticatedRequestModule {}
+
+describe('InteractionCoordinationController route aliases', (): void => {
+  let app: NestFastifyApplication | undefined;
+  const coordination = {
+    handoff: vi.fn(async () => ({ handoffId: 'handoff-1' })),
+    observe: vi.fn(async () => ({ status: 'running' })),
+    result: vi.fn(async () => ({ status: 'completed' })),
+  };
+
+  beforeAll(async (): Promise<void> => {
+    const moduleRef = await Test.createTestingModule({
+      imports: [AuthenticatedRequestModule],
+      controllers: [InteractionCoordinationController],
+      providers: [{ provide: InteractionCoordinationService, useValue: coordination }],
+    }).compile();
+    app = moduleRef.createNestApplication<NestFastifyApplication>(new FastifyAdapter());
+    await app.init();
+    await app.getHttpAdapter().getInstance().ready();
+  });
+  afterAll(async (): Promise<void> => app?.close());
+
+  it('routes handoff, observe, and result through the same AuthGuard-protected service for both prefixes', async (): Promise<void> => {
+    if (!app) throw new Error('test app was not initialized');
+    for (const prefix of ['/api/coord/interaction', '/api/coord/mos']) {
+      const headers = { cookie: 'session=trusted', 'x-correlation-id': `corr-${prefix}` };
+      expect(
+        (
+          await app.inject({
+            method: 'POST',
+            url: `${prefix}/handoff`,
+            headers,
+            payload: { idempotencyKey: `key-${prefix}`, summary: 'handoff' },
+          })
+        ).statusCode,
+      ).toBe(201);
+      expect(
+        (await app.inject({ method: 'GET', url: `${prefix}/handoff-1/observe`, headers }))
+          .statusCode,
+      ).toBe(200);
+      expect(
+        (await app.inject({ method: 'GET', url: `${prefix}/handoff-1/result`, headers }))
+          .statusCode,
+      ).toBe(200);
+    }
+    expect(coordination.handoff).toHaveBeenCalledTimes(2);
+    expect(coordination.observe).toHaveBeenCalledTimes(2);
+    expect(coordination.result).toHaveBeenCalledTimes(2);
+    expect(
+      (
+        await app.inject({
+          method: 'POST',
+          url: '/api/coord/interaction/handoff',
+          payload: { idempotencyKey: 'denied', summary: 'x' },
+        })
+      ).statusCode,
+    ).toBe(401);
+  });
+});

apps/gateway/src/coord/interaction-coordination.service.test.ts

@@ -0,0 +1,217 @@
+import { describe, expect, it, vi } from 'vitest';
+import {
+  InMemoryInteractionCoordinationPort,
+  type InteractionCoordinationPort,
+  type Handoff,
+} from '@mosaicstack/coord';
+import type { RuntimeProviderRequestContext } from '../agent/runtime-provider-registry.service.js';
+import {
+  InteractionCoordinationService,
+  type InteractionCoordinationConfig,
+  type InteractionCoordinationGatewayError,
+} from './interaction-coordination.service.js';
+
+const context: RuntimeProviderRequestContext = {
+  actorScope: { userId: 'operator-1', tenantId: 'tenant-a' },
+  channelId: 'cli',
+  correlationId: 'corr-1',
+};
+
+const config: InteractionCoordinationConfig = {
+  interactionAgentId: 'Nova',
+  orchestrationAgentId: 'Conductor',
+};
+
+function service(
+  port: InteractionCoordinationPort = new InMemoryInteractionCoordinationPort(),
+  options: {
+    config?: InteractionCoordinationConfig;
+    handoffIdFactory?: () => string;
+  } = {},
+): InteractionCoordinationService {
+  return new InteractionCoordinationService(
+    port,
+    options.config ?? config,
+    options.handoffIdFactory ?? (() => 'handoff-1'),
+  );
+}
+
+describe('InteractionCoordinationService authority boundary', (): void => {
+  it('derives identity and actor/tenant scope server-side, then round-trips the native adapter', async (): Promise<void> => {
+    const adapter = new InMemoryInteractionCoordinationPort();
+    const coordination = service(adapter);
+
+    await expect(
+      coordination.handoff(
+        { idempotencyKey: 'request-1', summary: 'Implement the requested feature' },
+        context,
+      ),
+    ).resolves.toEqual({
+      handoffId: 'handoff-1',
+      targetAgentId: 'Conductor',
+      status: 'queued',
+      correlationId: 'corr-1',
+    });
+
+    adapter.recordActivity('handoff-1', 'running', 'Orchestrator accepted the request');
+    adapter.recordResult('handoff-1', 'completed', 'Merged by orchestrator');
+
+    const followUpContext = { ...context, correlationId: 'corr-2' };
+    await expect(coordination.observe('handoff-1', followUpContext)).resolves.toMatchObject({
+      targetAgentId: 'Conductor',
+      status: 'completed',
+    });
+    await expect(coordination.result('handoff-1', followUpContext)).resolves.toMatchObject({
+      targetAgentId: 'Conductor',
+      status: 'completed',
+      summary: 'Merged by orchestrator',
+    });
+  });
+
+  it('fails closed without calling a port when the interaction requester is unconfigured', async (): Promise<void> => {
+    const adapter = new InMemoryInteractionCoordinationPort();
+    const handoff = vi.spyOn(adapter, 'handoff');
+    const coordination = service(adapter, {
+      config: { interactionAgentId: '', orchestrationAgentId: 'Conductor' },
+    });
+
+    await expect(
+      coordination.handoff(
+        { idempotencyKey: 'request-1', summary: 'Implement the requested feature' },
+        context,
+      ),
+    ).rejects.toMatchObject({
+      code: 'unconfigured_requester',
+    } satisfies Partial<InteractionCoordinationGatewayError>);
+    expect(handoff).not.toHaveBeenCalled();
+  });
+
+  it('rejects self-delegation configuration before delivering work', async (): Promise<void> => {
+    const adapter = new InMemoryInteractionCoordinationPort();
+    const handoff = vi.spyOn(adapter, 'handoff');
+    const coordination = service(adapter, {
+      config: { interactionAgentId: 'Nova', orchestrationAgentId: 'Nova' },
+    });
+
+    await expect(
+      coordination.handoff(
+        { idempotencyKey: 'request-1', summary: 'Implement the requested feature' },
+        context,
+      ),
+    ).rejects.toThrow('Interaction and orchestration identities must differ');
+    expect(handoff).not.toHaveBeenCalled();
+  });
+
+  it('denies cross-tenant observe and result before calling the adapter', async (): Promise<void> => {
+    const adapter = new InMemoryInteractionCoordinationPort();
+    const observe = vi.spyOn(adapter, 'observe');
+    const result = vi.spyOn(adapter, 'result');
+    const coordination = service(adapter);
+    await coordination.handoff(
+      { idempotencyKey: 'request-1', summary: 'Implement the requested feature' },
+      context,
+    );
+
+    const otherTenant = {
+      ...context,
+      actorScope: { ...context.actorScope, tenantId: 'tenant-b' },
+    };
+    await expect(coordination.observe('handoff-1', otherTenant)).rejects.toMatchObject({
+      code: 'cross_tenant_forbidden',
+    } satisfies Partial<InteractionCoordinationGatewayError>);
+    await expect(coordination.result('handoff-1', otherTenant)).rejects.toMatchObject({
+      code: 'cross_tenant_forbidden',
+    } satisfies Partial<InteractionCoordinationGatewayError>);
+    expect(observe).not.toHaveBeenCalled();
+    expect(result).not.toHaveBeenCalled();
+  });
+
+  it('scopes idempotency by actor and joins concurrent retries without duplicate delivery', async (): Promise<void> => {
+    let handoffSequence = 0;
+    let release: (() => void) | undefined;
+    const delivered = new Promise<void>((resolve: () => void): void => {
+      release = resolve;
+    });
+    const adapter: InteractionCoordinationPort = {
+      handoff: vi.fn(async (handoff: Handoff) => {
+        await delivered;
+        return {
+          handoffId: handoff.handoffId,
+          targetAgentId: handoff.targetAgentId,
+          status: 'queued' as const,
+          correlationId: handoff.scope.correlationId,
+        };
+      }),
+      observe: vi.fn(),
+      result: vi.fn(),
+    };
+    const coordination = service(adapter, {
+      handoffIdFactory: (): string => `handoff-${++handoffSequence}`,
+    });
+    const request = { idempotencyKey: 'request-1', summary: 'Implement the requested feature' };
+
+    const first = coordination.handoff(request, context);
+    const retry = coordination.handoff(request, context);
+    expect(adapter.handoff).toHaveBeenCalledTimes(1);
+    release?.();
+    await expect(Promise.all([first, retry])).resolves.toEqual([
+      expect.objectContaining({ handoffId: 'handoff-1' }),
+      expect.objectContaining({ handoffId: 'handoff-1' }),
+    ]);
+
+    await expect(
+      coordination.handoff(request, {
+        ...context,
+        actorScope: { ...context.actorScope, userId: 'operator-2' },
+      }),
+    ).resolves.toMatchObject({ handoffId: 'handoff-2' });
+    expect(adapter.handoff).toHaveBeenCalledTimes(2);
+  });
+
+  it('rejects idempotency-key payload drift and malformed handoff input before delivery', async (): Promise<void> => {
+    const adapter = new InMemoryInteractionCoordinationPort();
+    const handoff = vi.spyOn(adapter, 'handoff');
+    const coordination = service(adapter);
+    await coordination.handoff(
+      { idempotencyKey: 'request-1', summary: 'Implement the requested feature' },
+      context,
+    );
+
+    await expect(
+      coordination.handoff({ idempotencyKey: 'request-1', summary: 'Different work' }, context),
+    ).rejects.toMatchObject({
+      code: 'handoff_conflict',
+    } satisfies Partial<InteractionCoordinationGatewayError>);
+    await expect(
+      coordination.handoff({ idempotencyKey: 'request-2', summary: '' }, context),
+    ).rejects.toMatchObject({
+      code: 'invalid_request',
+    } satisfies Partial<InteractionCoordinationGatewayError>);
+    await expect(
+      coordination.handoff({ idempotencyKey: 'request-3', summary: 'x'.repeat(2_049) }, context),
+    ).rejects.toMatchObject({
+      code: 'invalid_request',
+    } satisfies Partial<InteractionCoordinationGatewayError>);
+    expect(handoff).toHaveBeenCalledTimes(1);
+  });
+
+  it('fails closed when the port reports a target that drifts from configuration', async (): Promise<void> => {
+    const adapter: InteractionCoordinationPort = {
+      handoff: vi.fn(async (handoff: Handoff) => ({
+        handoffId: handoff.handoffId,
+        targetAgentId: 'Unexpected',
+        status: 'accepted' as const,
+        correlationId: handoff.scope.correlationId,
+      })),
+      observe: vi.fn(),
+      result: vi.fn(),
+    };
+
+    await expect(
+      service(adapter).handoff(
+        { idempotencyKey: 'request-1', summary: 'Implement the requested feature' },
+        context,
+      ),
+    ).rejects.toMatchObject({ code: 'target_drift' });
+  });
+});

apps/gateway/src/coord/interaction-coordination.service.ts

@@ -0,0 +1,306 @@
+import { Inject, Injectable, Optional } from '@nestjs/common';
+import {
+  InteractionCoordinationClient,
+  type CoordinationObservation,
+  type CoordinationResult,
+  type CoordinationScope,
+  type InteractionCoordinationIdentity,
+  type InteractionCoordinationPort,
+  type HandoffReceipt,
+} from '@mosaicstack/coord';
+import type { RuntimeProviderRequestContext } from '../agent/runtime-provider-registry.service.js';
+import type { CreateHandoffDto } from './interaction-coordination.dto.js';
+
+export const COORDINATION_PORT = Symbol('COORDINATION_PORT');
+export const COORDINATION_CONFIG = Symbol('COORDINATION_CONFIG');
+export const HANDOFF_ID_FACTORY = Symbol('HANDOFF_ID_FACTORY');
+
+const HANDOFF_TRACKING_TTL_MS = 60 * 60 * 1_000;
+const MAX_TRACKED_HANDOFFS = 1_000;
+const MAX_IDEMPOTENCY_KEY_LENGTH = 128;
+const MAX_SUMMARY_LENGTH = 2_048;
+const MAX_CONTEXT_LENGTH = 8_192;
+const MAX_MISSION_ID_LENGTH = 128;
+
+export interface InteractionCoordinationConfig {
+  interactionAgentId?: string;
+  orchestrationAgentId?: string;
+}
+
+interface HandoffOwner {
+  actorId: string;
+  tenantId: string;
+  requesterAgentId: string;
+  correlationId: string;
+  expiresAt: number;
+}
+
+interface NormalizedHandoffRequest {
+  idempotencyKey: string;
+  summary: string;
+  context?: string;
+  missionId?: string;
+}
+
+interface TrackedHandoff {
+  request: NormalizedHandoffRequest;
+  receipt: Promise<HandoffReceipt>;
+  expiresAt: number;
+}
+
+/**
+ * Gateway authority boundary for the interaction agent. It derives requester,
+ * actor, and tenant from trusted server configuration and authentication; no
+ * channel request can name a target or gain orchestrator-owned orchestration verbs.
+ */
+@Injectable()
+export class InteractionCoordinationService {
+  private readonly owners = new Map<string, HandoffOwner>();
+  private readonly handoffsByIdempotencyKey = new Map<string, TrackedHandoff>();
+
+  constructor(
+    @Inject(COORDINATION_PORT) private readonly port: InteractionCoordinationPort,
+    @Inject(COORDINATION_CONFIG) private readonly config: InteractionCoordinationConfig,
+    @Optional()
+    @Inject(HANDOFF_ID_FACTORY)
+    private readonly handoffIdFactory: () => string = (): string => crypto.randomUUID(),
+  ) {}
+
+  async handoff(
+    request: CreateHandoffDto,
+    context: RuntimeProviderRequestContext,
+  ): Promise<HandoffReceipt> {
+    this.pruneExpiredTracking();
+    const normalized = this.normalizeRequest(request);
+    const scope = this.scope(context);
+    const idempotencyKey = this.idempotencyKey(normalized.idempotencyKey, scope);
+    const existing = this.handoffsByIdempotencyKey.get(idempotencyKey);
+    if (existing !== undefined) {
+      if (!sameRequest(existing.request, normalized)) {
+        throw new InteractionCoordinationGatewayError(
+          'handoff_conflict',
+          'Handoff idempotency key is already bound to different immutable input',
+        );
+      }
+      return existing.receipt;
+    }
+
+    const pending = this.deliverHandoff(this.handoffIdFactory(), normalized, scope);
+    const tracked: TrackedHandoff = {
+      request: normalized,
+      receipt: pending,
+      expiresAt: this.expiresAt(),
+    };
+    this.handoffsByIdempotencyKey.set(idempotencyKey, tracked);
+    this.enforceTrackingLimit(this.handoffsByIdempotencyKey);
+    try {
+      return await pending;
+    } catch (error: unknown) {
+      if (this.handoffsByIdempotencyKey.get(idempotencyKey) === tracked) {
+        this.handoffsByIdempotencyKey.delete(idempotencyKey);
+      }
+      throw error;
+    }
+  }
+
+  async observe(
+    handoffId: string,
+    context: RuntimeProviderRequestContext,
+  ): Promise<CoordinationObservation> {
+    this.pruneExpiredTracking();
+    const scope = this.scope(context);
+    const owner = this.ownerFor(handoffId, scope);
+    return this.client().observe(handoffId, { ...scope, correlationId: owner.correlationId });
+  }
+
+  async result(
+    handoffId: string,
+    context: RuntimeProviderRequestContext,
+  ): Promise<CoordinationResult> {
+    this.pruneExpiredTracking();
+    const scope = this.scope(context);
+    const owner = this.ownerFor(handoffId, scope);
+    return this.client().result(handoffId, { ...scope, correlationId: owner.correlationId });
+  }
+
+  private async deliverHandoff(
+    handoffId: string,
+    request: NormalizedHandoffRequest,
+    scope: CoordinationScope,
+  ): Promise<HandoffReceipt> {
+    const receipt = await this.client((): string => handoffId).handoff(request, scope);
+    const owner: HandoffOwner = {
+      actorId: scope.actorId,
+      tenantId: scope.tenantId,
+      requesterAgentId: scope.requesterAgentId,
+      correlationId: scope.correlationId,
+      expiresAt: this.expiresAt(),
+    };
+    const existing = this.owners.get(receipt.handoffId);
+    if (existing !== undefined && !sameOwner(existing, owner)) {
+      throw new InteractionCoordinationGatewayError(
+        'handoff_conflict',
+        'Handoff ID is already bound to a different authenticated scope',
+      );
+    }
+    this.owners.set(receipt.handoffId, owner);
+    this.enforceTrackingLimit(this.owners);
+    return receipt;
+  }
+
+  private client(handoffIdFactory?: () => string): InteractionCoordinationClient {
+    return new InteractionCoordinationClient(this.identity(), this.port, handoffIdFactory);
+  }
+
+  private identity(): InteractionCoordinationIdentity {
+    const interactionAgentId = this.config.interactionAgentId?.trim();
+    const orchestrationAgentId = this.config.orchestrationAgentId?.trim();
+    if (!interactionAgentId) {
+      throw new InteractionCoordinationGatewayError(
+        'unconfigured_requester',
+        'Interaction agent identity is not configured',
+      );
+    }
+    if (!orchestrationAgentId) {
+      throw new InteractionCoordinationGatewayError(
+        'unconfigured_target',
+        'Orchestration agent identity is not configured',
+      );
+    }
+    return { interactionAgentId, orchestrationAgentId };
+  }
+
+  private scope(context: RuntimeProviderRequestContext): CoordinationScope {
+    const identity = this.identity();
+    return Object.freeze({
+      actorId: context.actorScope.userId,
+      tenantId: context.actorScope.tenantId,
+      correlationId: context.correlationId,
+      requesterAgentId: identity.interactionAgentId,
+    });
+  }
+
+  private normalizeRequest(request: CreateHandoffDto): NormalizedHandoffRequest {
+    if (typeof request !== 'object' || request === null) {
+      throw new InteractionCoordinationGatewayError(
+        'invalid_request',
+        'Handoff request is invalid',
+      );
+    }
+    const idempotencyKey = this.requiredString(
+      request.idempotencyKey,
+      'idempotency key',
+      MAX_IDEMPOTENCY_KEY_LENGTH,
+    );
+    const summary = this.requiredString(request.summary, 'summary', MAX_SUMMARY_LENGTH);
+    const context = this.optionalString(request.context, 'context', MAX_CONTEXT_LENGTH);
+    const missionId = this.optionalString(request.missionId, 'mission ID', MAX_MISSION_ID_LENGTH);
+    return Object.freeze({
+      idempotencyKey,
+      summary,
+      ...(context === undefined ? {} : { context }),
+      ...(missionId === undefined ? {} : { missionId }),
+    });
+  }
+
+  private idempotencyKey(requestKey: string, scope: CoordinationScope): string {
+    return `${scope.tenantId}\u0000${scope.actorId}\u0000${scope.requesterAgentId}\u0000${requestKey}`;
+  }
+
+  private requiredString(value: unknown, field: string, maximumLength: number): string {
+    if (typeof value !== 'string') {
+      throw new InteractionCoordinationGatewayError(
+        'invalid_request',
+        `Handoff ${field} must be a string`,
+      );
+    }
+    const normalized = value.trim();
+    if (normalized.length === 0 || normalized.length > maximumLength) {
+      throw new InteractionCoordinationGatewayError(
+        'invalid_request',
+        `Handoff ${field} is invalid`,
+      );
+    }
+    return normalized;
+  }
+
+  private optionalString(value: unknown, field: string, maximumLength: number): string | undefined {
+    if (value === undefined) return undefined;
+    return this.requiredString(value, field, maximumLength);
+  }
+
+  private expiresAt(): number {
+    return Date.now() + HANDOFF_TRACKING_TTL_MS;
+  }
+
+  private pruneExpiredTracking(): void {
+    const now = Date.now();
+    for (const [key, tracked] of this.handoffsByIdempotencyKey) {
+      if (tracked.expiresAt <= now) this.handoffsByIdempotencyKey.delete(key);
+    }
+    for (const [key, owner] of this.owners) {
+      if (owner.expiresAt <= now) this.owners.delete(key);
+    }
+  }
+
+  private enforceTrackingLimit<T>(entries: Map<string, T>): void {
+    while (entries.size > MAX_TRACKED_HANDOFFS) {
+      const oldest = entries.keys().next().value;
+      if (typeof oldest !== 'string') return;
+      entries.delete(oldest);
+    }
+  }
+
+  private ownerFor(handoffId: string, scope: CoordinationScope): HandoffOwner {
+    const owner = this.owners.get(handoffId);
+    if (owner === undefined) {
+      throw new InteractionCoordinationGatewayError('not_found', 'Handoff was not found');
+    }
+    if (
+      owner.tenantId !== scope.tenantId ||
+      owner.actorId !== scope.actorId ||
+      owner.requesterAgentId !== scope.requesterAgentId
+    ) {
+      throw new InteractionCoordinationGatewayError(
+        'cross_tenant_forbidden',
+        'Handoff is outside the authenticated scope',
+      );
+    }
+    return owner;
+  }
+}
+
+export type InteractionCoordinationGatewayErrorCode =
+  | 'cross_tenant_forbidden'
+  | 'handoff_conflict'
+  | 'invalid_request'
+  | 'not_found'
+  | 'unconfigured_requester'
+  | 'unconfigured_target';
+
+function sameOwner(left: HandoffOwner, right: HandoffOwner): boolean {
+  return (
+    left.actorId === right.actorId &&
+    left.tenantId === right.tenantId &&
+    left.requesterAgentId === right.requesterAgentId
+  );
+}
+
+function sameRequest(left: NormalizedHandoffRequest, right: NormalizedHandoffRequest): boolean {
+  return (
+    left.idempotencyKey === right.idempotencyKey &&
+    left.summary === right.summary &&
+    left.context === right.context &&
+    left.missionId === right.missionId
+  );
+}
+
+export class InteractionCoordinationGatewayError extends Error {
+  constructor(
+    readonly code: InteractionCoordinationGatewayErrorCode,
+    message: string,
+  ) {
+    super(message);
+    this.name = InteractionCoordinationGatewayError.name;
+  }
+}

apps/gateway/src/database/database.module.ts

@@ -1,8 +1,21 @@
 import { mkdirSync } from 'node:fs';
 import { homedir } from 'node:os';
 import { join } from 'node:path';
-import { Global, Inject, Module, type OnApplicationShutdown } from '@nestjs/common';
-import { createDb, createPgliteDb, type Db, type DbHandle } from '@mosaicstack/db';
+import {
+  Global,
+  Inject,
+  Logger,
+  Module,
+  type OnApplicationShutdown,
+  type OnModuleInit,
+} from '@nestjs/common';
+import {
+  createDb,
+  createPgliteDb,
+  runPgliteMigrations,
+  type Db,
+  type DbHandle,
+} from '@mosaicstack/db';
 import { createStorageAdapter, type StorageAdapter } from '@mosaicstack/storage';
 import type { MosaicConfig } from '@mosaicstack/config';
 import { MOSAIC_CONFIG } from '../config/config.module.js';
@@ -39,12 +52,37 @@ export const STORAGE_ADAPTER = 'STORAGE_ADAPTER';
   ],
   exports: [DB, STORAGE_ADAPTER],
 })
-export class DatabaseModule implements OnApplicationShutdown {
+export class DatabaseModule implements OnApplicationShutdown, OnModuleInit {
+  private readonly logger = new Logger(DatabaseModule.name);
+
   constructor(
     @Inject(DB_HANDLE) private readonly handle: DbHandle,
     @Inject(STORAGE_ADAPTER) private readonly storageAdapter: StorageAdapter,
+    @Inject(MOSAIC_CONFIG) private readonly config: MosaicConfig,
   ) {}
 
+  // Migrations must complete before any module that injects DB starts serving
+  // requests. NestJS awaits onModuleInit before app.listen(), and modules that
+  // inject DB are initialized after this one — so all DB-dependent code sees a
+  // populated schema before the first HTTP request lands.
+  //
+  // Local (PGlite) tier: we run gateway-DB migrations explicitly here. The
+  // storage adapter writes to a separate PGlite directory and only manages its
+  // own KV tables, so we still call its migrate() afterwards.
+  //
+  // Postgres tier: PostgresAdapter.migrate() already calls runMigrations() on
+  // the same DATABASE_URL, so a single call covers both the gateway DB and
+  // the storage tables. We deliberately do NOT call runMigrations() here to
+  // avoid opening a second short-lived connection and doubling startup cost.
+  async onModuleInit(): Promise<void> {
+    if (this.config.tier === 'local') {
+      this.logger.log('Applying PGlite schema migrations...');
+      await runPgliteMigrations(this.handle);
+    }
+    this.logger.log(`Initializing storage adapter (${this.storageAdapter.name})...`);
+    await this.storageAdapter.migrate();
+  }
+
   async onApplicationShutdown(): Promise<void> {
     await Promise.all([this.handle.close(), this.storageAdapter.close()]);
   }

apps/gateway/src/env.ts

@@ -0,0 +1,133 @@
+import { config } from 'dotenv';
+import { existsSync } from 'node:fs';
+import { homedir } from 'node:os';
+import { dirname, join, resolve } from 'node:path';
+import { fileURLToPath } from 'node:url';
+import { detectFromEnv, loadConfig } from '@mosaicstack/config';
+
+type TierSource =
+  | 'process environment'
+  | 'daemon .env'
+  | 'monorepo-root .env'
+  | 'gateway-local .env'
+  | 'default';
+
+type BootSource = TierSource | 'mosaic.config.json';
+
+export interface GatewayDotenvPaths {
+  daemonEnv: string;
+  monorepoRootEnv: string;
+  gatewayLocalEnv: string;
+}
+
+const here = dirname(fileURLToPath(import.meta.url));
+
+export function resolveGatewayDotenvPaths(
+  anchor: string = here,
+  homeBase: string = homedir(),
+): GatewayDotenvPaths {
+  return {
+    daemonEnv: join(homeBase, '.config', 'mosaic', 'gateway', '.env'),
+    monorepoRootEnv: resolve(anchor, '../../..', '.env'),
+    gatewayLocalEnv: resolve(anchor, '..', '.env'),
+  };
+}
+
+export function resolveGatewayConfigPath(anchor: string = here): string {
+  // GATEWAY_HOME is daemon-created 0700; its env override adds no authority because env can set MOSAIC_STORAGE_TIER.
+  const gatewayHome = resolve(
+    process.env['MOSAIC_GATEWAY_HOME'] ?? join(homedir(), '.config', 'mosaic', 'gateway'),
+  );
+  const daemonConfig = join(gatewayHome, 'mosaic.config.json');
+  const gatewayLocalConfig = resolve(anchor, '..', 'mosaic.config.json');
+  const monorepoRootConfig = resolve(anchor, '../../..', 'mosaic.config.json');
+
+  if (existsSync(daemonConfig)) {
+    return daemonConfig;
+  }
+  if (existsSync(gatewayLocalConfig)) {
+    return gatewayLocalConfig;
+  }
+  if (existsSync(monorepoRootConfig)) {
+    return monorepoRootConfig;
+  }
+
+  return monorepoRootConfig;
+}
+
+export function loadGatewayEnv(anchor: string = here, homeBase: string = homedir()): void {
+  const { daemonEnv, monorepoRootEnv, gatewayLocalEnv } = resolveGatewayDotenvPaths(
+    anchor,
+    homeBase,
+  );
+  const inheritedTier = process.env['MOSAIC_STORAGE_TIER'];
+  let tierSource: TierSource = inheritedTier === undefined ? 'default' : 'process environment';
+  const inheritedDatabaseUrl = process.env['DATABASE_URL'];
+  let databaseUrlSource: TierSource =
+    inheritedDatabaseUrl === undefined ? 'default' : 'process environment';
+
+  function loadAnchoredDotenv(
+    path: string,
+    sourceLabel: Exclude<TierSource, 'process environment' | 'default'>,
+  ): void {
+    if (!existsSync(path)) {
+      return;
+    }
+
+    const beforeTier = process.env['MOSAIC_STORAGE_TIER'];
+    const beforeDatabaseUrl = process.env['DATABASE_URL'];
+    config({ path, quiet: true });
+
+    if (
+      beforeTier === undefined &&
+      process.env['MOSAIC_STORAGE_TIER'] !== undefined &&
+      tierSource === 'default'
+    ) {
+      tierSource = sourceLabel;
+    }
+
+    if (
+      beforeDatabaseUrl === undefined &&
+      process.env['DATABASE_URL'] !== undefined &&
+      databaseUrlSource === 'default'
+    ) {
+      databaseUrlSource = sourceLabel;
+    }
+  }
+
+  // Load .env from daemon config dir (global install / daemon mode) first.
+  // It takes precedence over file-based local-dev configuration.
+  loadAnchoredDotenv(daemonEnv, 'daemon .env');
+
+  // Load .env from the anchored monorepo root, then fill any remaining values
+  // from apps/gateway/.env when present.
+  loadAnchoredDotenv(monorepoRootEnv, 'monorepo-root .env');
+  loadAnchoredDotenv(gatewayLocalEnv, 'gateway-local .env');
+
+  const envOnlyTier = detectFromEnv().tier;
+  const configPath = resolveGatewayConfigPath(anchor);
+  const anchoredConfigExists = existsSync(configPath);
+  const resolvedTier = loadConfig(configPath).tier;
+  const configuredTier = process.env['MOSAIC_STORAGE_TIER'];
+  const databaseUrlDeterminesTier = envOnlyTier === 'standalone' && configuredTier !== 'standalone';
+  const recognizedTierDeterminesTier =
+    (configuredTier === 'federated' ||
+      configuredTier === 'standalone' ||
+      configuredTier === 'local') &&
+    configuredTier === envOnlyTier;
+
+  let source: BootSource;
+  if (anchoredConfigExists) {
+    source = 'mosaic.config.json';
+  } else if (databaseUrlDeterminesTier && databaseUrlSource !== 'default') {
+    source = databaseUrlSource;
+  } else if (recognizedTierDeterminesTier && tierSource !== 'default') {
+    source = tierSource;
+  } else {
+    source = 'default';
+  }
+
+  console.info(`[gateway env] storage tier=${resolvedTier} source=${source}`);
+}
+
+loadGatewayEnv();