test(gateway): cross-user-isolation cleanup honors dbAvailable (#1275)

The no-database skip path failed the file: createDb connects lazily, so
on an unreachable database 'handle' is set while nothing was inserted;
afterAll checked only 'handle' and its cleanup deletes threw
ECONNREFUSED, failing the suite despite 28/28 tests being skipped.

Caught live by the publish pipeline's verify gate (pipeline 2486,
first gated publish after #1277): the gate's no-DATABASE_URL PGlite
path runs 'pnpm test' without ci-postgres, cross-user-isolation hit
its dead-cleanup path, verify correctly failed closed and blocked all
publish steps (build/publish-npm/build-gateway skipped).

Verified both paths: DATABASE_URL=dead-port -> 28 skipped, file
PASSES (was the failure); live 5433 -> 28 passed. Sibling suites
checked: connector-lease.postgres.integration skips at describe level
(describe.skipIf) so its afterAll never runs unguarded.

.woodpecker/ci.yml

@@ -30,6 +30,19 @@ steps:
       # the baked pnpm store.
       - pnpm install --frozen-lockfile --prefer-offline
 
+  # ---------------------------------------------------------------------------
+  # The steps below (sanitization, upgrade-guard, typecheck, lint, format,
+  # test) are the COMPLETE mandatory verification set. SDLC-D-034 mirrors them
+  # one-for-one in the canonical terminal verification command — root
+  # `pnpm verify:release` (scripts/verify-release.mjs) — which the publish
+  # pipeline (.woodpecker/publish.yml `verify` step) runs before ANY publish
+  # effect. These lines stay direct (not routed through the runner) because the
+  # #1017 test-enumeration guard audits framework tool paths through THIS
+  # surface; scripts/verify-release.test.mjs enforces that the runner's stage
+  # table keeps matching these commands exactly, so the two cannot drift.
+  # ---------------------------------------------------------------------------
+
+  # Canonical verify:release stage `sanitization`.
   # Blocking gate: public framework package must contain no operator-specific
   # personal data or private $HOME defaults. Runs early (no node_modules needed).
   sanitization:
@@ -47,6 +60,7 @@ steps:
       # with everything it guards; this direct line keeps one instrument running.
       - bash packages/mosaic/framework/tools/quality/scripts/check-test-enumeration.sh
 
+  # Canonical verify:release stage `upgrade-guard`.
   # 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 —
@@ -68,6 +82,8 @@ steps:
       - bash packages/mosaic/framework/tools/quality/scripts/test-upgrade-durable-snapshot.sh
       - bash packages/mosaic/framework/tools/quality/scripts/test-install-migration.sh
 
+  # Canonical verify:release stage `typecheck` — the same `pnpm typecheck`
+  # invocation (which runs the checkout preflight first, then turbo).
   typecheck:
     image: *node_image
     commands:
@@ -78,7 +94,8 @@ steps:
       - sanitization
       - upgrade-guard
 
-  # lint, format, and test are independent — run in parallel after typecheck
+  # lint, format, and test are independent — run in parallel after typecheck.
+  # Each runs exactly its canonical verify:release stage command.
   lint:
     image: *node_image
     commands:
@@ -95,6 +112,12 @@ steps:
     depends_on:
       - typecheck
 
+  # Canonical verify:release stage `test` — the `pnpm test` line below is the
+  # shared command; everything else in this step is PIPELINE-LEVEL
+  # prerequisite the canonical command expects its caller to provide (SDLC-D-034):
+  # the ci-postgres service + pg_isready wait + db:migrate (postgres path),
+  # `apk add openssl`, and the pinned pi install. None of those can move into
+  # the runner (it must also work locally on the PGlite path with no database).
   test:
     image: *node_image
     environment:

.woodpecker/publish.yml

@@ -1,5 +1,19 @@
 # Build, publish npm packages, and push Docker images
 # Runs on main for stable publishes and on next for integration-line prereleases/images
+#
+# SDLC-D-034 publish gate: every publish effect (publish-npm, publish-next-npm,
+# and every image build/push step) depends DIRECTLY on the `verify` step below.
+# `verify` (a) asserts the provider's commit identity matches the actual
+# checkout (CI_COMMIT_SHA == git rev-parse HEAD, fail closed on mismatch or
+# emptiness) and (b) runs the canonical terminal verification command
+# (`pnpm verify:release`), which mirrors the PR CI pipeline's complete
+# mandatory set (sanitization, upgrade-guard, preflight+typecheck, lint,
+# format:check, test, build) — see scripts/verify-release.mjs. A missing,
+# failed, skipped, cancelled, or inconclusive verification therefore skips the
+# dependent publish effects (fail closed). Path-filtered short-circuits may
+# skip publish EFFECTS (e.g. docs-only merges) but never bypass `verify` for a
+# publish that does run: `verify` itself carries no path filter.
+# scripts/verify-release.test.mjs enforces this DAG invariant at checkout time.
 
 variables:
   # Pre-baked CI base (see .woodpecker/ci-image.yml): node:24-alpine +
@@ -48,6 +62,45 @@ steps:
       # Resolve from the baked pnpm store instead of a cold network fetch.
       - pnpm install --frozen-lockfile --prefer-offline
 
+  # SDLC-D-034 exact-commit publish gate. No `when`/path filter on purpose: it
+  # runs for every event this pipeline serves so no publish effect can ever
+  # start without it. Fails closed on commit-identity mismatch (or either SHA
+  # being empty) and on any incomplete verification.
+  verify:
+    image: *node_image
+    commands:
+      - *enable_pnpm
+      # (a) Commit identity: the provider's claimed SHA must equal the actual
+      # checkout HEAD — verification of anything else must never authorize a
+      # publish of this commit.
+      - |
+        if [ -z "$CI_COMMIT_SHA" ]; then
+          echo "[verify] FATAL: CI_COMMIT_SHA is empty — cannot certify commit identity" >&2
+          exit 1
+        fi
+        CHECKOUT_SHA="$(git rev-parse HEAD 2>/dev/null || true)"
+        if [ -z "$CHECKOUT_SHA" ]; then
+          echo "[verify] FATAL: git rev-parse HEAD returned nothing — cannot certify commit identity" >&2
+          exit 1
+        fi
+        if [ "$CI_COMMIT_SHA" != "$CHECKOUT_SHA" ]; then
+          echo "[verify] FATAL: provider commit ($CI_COMMIT_SHA) != checkout HEAD ($CHECKOUT_SHA)" >&2
+          exit 1
+        fi
+        echo "[verify] commit identity confirmed: $CHECKOUT_SHA"
+      # (b) Canonical terminal verification. Caller-provided prerequisites the
+      # runner expects (see .woodpecker/ci.yml comments): bash/rsync for the
+      # guard stages, openssl + the pinned pi binary for the test stage. git is
+      # baked into ci-base but re-asserted here so the identity check above can
+      # never silently depend on a stale baked image. DATABASE_URL is
+      # deliberately NOT set: the canonical command must hold on the PGlite
+      # path too and never sets or requires a database itself.
+      - apk add --no-cache bash rsync openssl git
+      - npm install -g @earendil-works/[email protected]
+      - pnpm verify:release
+    depends_on:
+      - install
+
   build:
     image: *node_image
     commands:
@@ -55,6 +108,7 @@ steps:
       - pnpm build
     depends_on:
       - install
+      - verify
 
   publish-npm:
     image: *node_image
@@ -114,6 +168,7 @@ steps:
         exit 1
     depends_on:
       - build
+      - verify
 
   publish-next-npm:
     image: *node_image
@@ -192,6 +247,7 @@ steps:
         echo "[publish-next] @mosaicstack/mosaic@next resolves to $RESOLVED_VERSION"
     depends_on:
       - build
+      - verify
 
   # TODO: Uncomment when ready to publish to npmjs.org
   # publish-npmjs:
@@ -205,6 +261,7 @@ steps:
   #     - bash scripts/publish-npmjs.sh
   #   depends_on:
   #     - build
+  #     - verify
   #   when:
   #     - event: [tag]
 
@@ -242,6 +299,7 @@ steps:
         /kaniko/executor --context . --dockerfile docker/gateway.Dockerfile $DESTINATIONS
     depends_on:
       - build
+      - verify
 
   build-appservice:
     image: gcr.io/kaniko-project/executor:debug
@@ -268,6 +326,7 @@ steps:
         /kaniko/executor --context . --dockerfile docker/appservice.Dockerfile $DESTINATIONS
     depends_on:
       - build
+      - verify
 
   build-web:
     image: gcr.io/kaniko-project/executor:debug
@@ -294,3 +353,4 @@ steps:
         /kaniko/executor --context . --dockerfile docker/web.Dockerfile $DESTINATIONS
     depends_on:
       - build
+      - verify

apps/gateway/src/__tests__/cross-user-isolation.test.ts

@@ -190,7 +190,13 @@ beforeEach((ctx) => {
 });
 
 afterAll(async () => {
-  if (!handle) return;
+  // Cleanup only when the fixture actually installed rows. `handle` is set
+  // before the first query (createDb connects lazily), so on an unreachable
+  // database `handle` is truthy while nothing was inserted — cleanup must
+  // honor `dbAvailable` or the skip path fails the file with ECONNREFUSED in
+  // afterAll (caught live by the publish pipeline's no-DATABASE_URL verify
+  // step, pipeline 2486).
+  if (!handle || !dbAvailable) return;
   const db = handle.db;
 
   // Delete in dependency order (FK constraints)

docs/PRD.md

@@ -1368,3 +1368,38 @@ All work is **alpha** (< 0.1.0) until Jason approves 0.1.0 beta release.
 10. ASSUMPTION: **Conversations and messages get their own PG tables** (not stored in brain's entity model). They follow a chat-specific schema with proper foreign keys to users and projects. Rationale: Chat has different access patterns (streaming, pagination, search) than brain entities.
 
 11. RESOLVED: **Pi handles all target LLM providers natively.** Anthropic, OpenAI/Codex, Z.ai, Ollama, LM Studio, and llama.cpp are all supported via Pi's built-in providers or `models.json` configuration with `openai-completions` API type. No custom provider adapters needed in @mosaicstack/agent — only configuration management.
+
+---
+
+## Release Integrity Workstream (RI, #1275)
+
+### Problem and objective
+
+At `next` 476db12b (review of 2026-08-17), publication from `next` is not bound to the full verification pipeline for the same commit: the publish pipeline's publish steps depend on `build` only, while ordinary push CI excludes `next`. Public Forge/MACP paths contain false-success placeholders: a stub executor that reports `completed` with exit zero, planning/remediation gates that execute literal `true`, a review gate that echoes an approving verdict, and a gate runner that treats empty commands and unimplemented CI-provider gates as passing. Shipping UI surfaces can render a failed fetch as an empty, healthy collection.
+
+Objective: for alpha 0.0.50, the release cannot publish, report, or display work state that the repository has not actually verified. Decisions SDLC-D-033 through SDLC-D-038 (Jason, 2026-08-17) scope this floor; full decision text and required-behavior lists live in jarvis-brain `docs/plans/2026-08-16_mosaic-stack-sdlc-protocol.md` and `data/decisions/mosaic-stack-sdlc-protocol.json`. This section restates only the normative requirements.
+
+### Normative requirements
+
+1. **RI-N1 Exact-commit publication verification (SDLC-D-034).** One canonical terminal verification command performs self-contained re-verification in the publish pipeline against the job's checked-out commit before any external publication effect. The command contains or invokes the complete mandatory verification set (semantic parity with the PR merge gate, including sanitization, upgrade-guard, typecheck, lint, format check, tests, and build); CI and publication do not maintain separate semantic checklists. Every publish step depends on the verification step in the executable pipeline DAG. Provider commit identity and `git rev-parse HEAD` must identify the same commit. Missing, skipped, cancelled, stale, or inconclusive checks fail closed. Documentation-only runs may skip publication but cannot bypass verification when a publication effect will occur. A negative control must prove that a broken check blocks every publish step.
+
+2. **RI-N2 Fail-closed Forge/MACP with explicit simulation (SDLC-D-035).** Simulation requires explicit caller intent (e.g. `--simulate`) and produces a distinct typed `simulated` state that can never satisfy dependencies, acceptance criteria, gates, merge, or release. Normal execution exits nonzero with a typed capability failure when a required executor, reviewer, command, or CI provider is absent — no stub completion, no literal-`true` gates, no synthetic approvals, no empty-command passes. A manual gate with no automation enters a waiting state; it does not pass. Positive tests prove explicit simulation still works; negative controls prove simulation and every missing-provider case cannot advance lifecycle state.
+
+3. **RI-N3 One transitional PRD authority (SDLC-D-036).** `@mosaicstack/prdy` structured storage under `docs/prdy/`, driven by `mosaic mission --plan`, is the authoritative PRD representation for the alpha. `mosaic prdy` either routes through the same application service or operates only as an explicit, named Markdown import/export adapter; `docs/PRD.md` is not a peer authority. `mission --plan` must persist the mission↔PRD linkage (mission id/version, PRD id/version, selected requirements). Markdown output is a generated view carrying source identity; editing it cannot mutate authority silently. Import is explicit, validated, and conflict-aware (proposed successor, never overwrite). Structural validity is separate from approval.
+
+4. **RI-N4 One quality-rails evaluator (SDLC-D-037).** The TypeScript quality-rails package is the sole authoritative evaluator. A complete probe inventory maps every current TypeScript and shell check to one canonical check with disposition (preserve/strengthen/retire, each named). Effective shell enforcement probes are absorbed before their independent paths retire; expected-file presence alone is not parity. The evaluator returns typed results (`passed`/`failed`/`blocked`/`error`/`not-applicable`) with check version, subject, and reason; missing implementation, missing input, unknown check, process error, timeout, or malformed output can never become `passed` or an unqualified skip. Check definitions and policy are versioned and digested. Shell commands become thin adapters with no separate verdict logic. The canonical terminal verification command (RI-N1) invokes this evaluator rather than duplicating its logic. Contract, parity, and negative-control tests are required, plus independent review of probe equivalence.
+
+5. **RI-N5 Consequence-aware stale UI (SDLC-D-038).** Mission Control distinguishes typed freshness states (`current`, `stale`, `partial`, `unknown`, `unavailable`) rather than inferring from empty arrays or null. A failed fetch never renders as an empty healthy collection. Last-known data may display for situational awareness only with source identity, version, and age visibly labeled; any derived completion/assurance/release verdict whose inputs are stale becomes `unknown`; all state-changing actions are disabled until fresh state loads and is revalidated. With no verified snapshot, surfaces show an explicit unavailable state. Cache corruption, cross-workspace data, schema mismatch, and version regression invalidate the snapshot. Tests cover the failure matrix (network, auth, malformed, partial, corruption, stale age, schema mismatch, recovery, stale-action rejection) with negative controls proving no case yields a current green verdict or enabled mutation.
+
+### Acceptance criteria
+
+- AC-RI-1: A push to `next` that fails any mandatory verification step publishes nothing (no npm package, no image), demonstrated by a checked-in negative control and by pipeline evidence on a real `next` publish run where the verification step is green and every publish step depends on it.
+- AC-RI-2: With no executor/reviewer/CI provider wired, Forge and MACP normal runs exit nonzero with typed capability failures; with `--simulate`, runs complete but every result is typed `simulated` and cannot satisfy any gate, dependency, or completion state — proven by unit tests including negative controls.
+- AC-RI-3: A PRD created or revised through either `mosaic mission --plan` or `mosaic prdy` resolves to one authority under `docs/prdy/` with stable identities and versions; the mission↔PRD linkage survives restart; a Markdown export is labeled as generated and cannot silently become a second writer; divergent legacy content blocks baseline claims until explicitly resolved — proven by contract tests.
+- AC-RI-4: `quality-rails check` through any entry point (TS CLI, framework shell adapter) returns the same typed verdict for the same subject; the probe inventory names every legacy check's disposition; a deliberately broken probe fails closed — proven by contract/parity/negative-control tests and independent review of probe equivalence.
+- AC-RI-5: No shipping surface renders a failed fetch as an empty healthy state; stale/partial/unavailable states are typed, labeled, and mutation-disabled — proven by the failure-matrix tests.
+- AC-RI-6: All cards merged to `next` via squash PR with terminal-green CI; release evidence for 0.0.50 records commit, verification run, and published artifacts.
+
+### Out of scope
+
+The canonical dispatcher/control-plane vertical slice (work graph, execution attempts, fenced leases, typed check-in, independent verifier dispatch) is decided post-alpha (SDLC-D-033, option B). Multi-pipeline verification certificates (SDLC-D-034 option B) are post-alpha. Full AF-1..AF-4 objective matrices and Mission Control portfolio surfaces are post-alpha.

docs/release-integrity/TASKS.md

@@ -0,0 +1,42 @@
+# Tasks — Release Integrity Workstream (RI-050, #1275)
+
+> Single-writer: the RI-050 orchestrator (jarvis, dragon-lin) only. Workers read but never modify.
+>
+> **Mission:** alpha 0.0.50 release-integrity floor (decisions SDLC-D-033..038).
+> **PRD:** [docs/PRD.md § Release Integrity Workstream](../PRD.md#release-integrity-workstream-ri-1275)
+> **Issue:** #1275 (remains open until RI-V-001 closes)
+> **Base branch:** `next` (all cards branch from `origin/next`, squash-merge via PR)
+>
+> **Execution note:** the `agent` column uses `pi-glm-5.3` — outside the pipeline-cron model
+> table on purpose. This workstream is executed by jarvis on dragon-lin with local pi workers
+> (`pi --model zai/glm-5.3:high`); pipeline crons must not auto-claim these rows.
+>
+> **Status values:** `not-started` | `in-progress` | `done` | `blocked` | `failed` | `needs-qa`
+> `done` requires: repo quality gates green, independent review recorded, terminal-green CI on
+> the PR head, squash merge to `next`, and acceptance evidence in notes.
+
+| id       | status      | description                                                                                                                                                                                                                                                                      | issue | agent      | repo              | branch                            | depends_on                                                 | estimate | notes                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
+| -------- | ----------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----- | ---------- | ----------------- | --------------------------------- | ---------------------------------------------------------- | -------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| RI-0-001 | in-progress | Bootstrap: issue #1275, PRD section, this DAG, scratchpad (docs only)                                                                                                                                                                                                            | #1275 | pi-glm-5.3 | mosaicstack/stack | docs/ri-050-mission-bootstrap     | —                                                          | 6K       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
+| RI-1-001 | in-progress | RI-N1: canonical terminal verification command + publish-pipeline exact-commit gate (every publish step depends on verify; commit identity check; fail closed)                                                                                                                   | #1275 | pi-glm-5.3 | mosaicstack/stack | feat/ri-050-publish-gate          | RI-0-001                                                   | 25K      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
+| RI-1-002 | not-started | RI-N1 negative control: checked-in tests proving a broken mandatory check blocks every publish step and that DAG edges cannot be bypassed                                                                                                                                        | #1275 | pi-glm-5.3 | mosaicstack/stack | test/ri-050-publish-gate-negative | RI-1-001                                                   | 12K      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
+| RI-2-001 | in-progress | RI-N2 (Forge): remove stub-executor false success; `--simulate` typed `simulated` results that satisfy nothing; literal-`true` gates and echo-review replaced with real gates or typed waiting-for-authority                                                                     | #1275 | pi-glm-5.3 | mosaicstack/stack | fix/ri-050-forge-fail-closed      | RI-0-001                                                   | 20K      | Independent review APPROVED 2026-08-17 (Gitea review 172 on PR #1278, head 99b8f6ea; reviewing seat fargo — recorded under shared host principal mos-dt-0, provenance correction posted by fred; wrapper gap filed by fred). Executed at head: forge tests 116/116, lint green, typecheck green after building macp dist (minimal-install artifact, not a defect), workspace typecheck 45/45, no external type consumers of the changed interfaces. CI red = known lane-wide fleet-test failure only, carries no information about this change (fred, log-content analysis, pipelines 2456-2458). Non-blocking finding: README L141-143 + skills/mosaic-forge/SKILL.md document bare forge run/resume, which now fails closed — fast-follow docs touch. Merge queued behind #1270. |
+| RI-2-002 | in-progress | RI-N2 (MACP): gate runner fails closed on empty commands, stub executors, and unimplemented CI-provider gates unless explicit simulate; typed capability failures                                                                                                                | #1275 | pi-glm-5.3 | mosaicstack/stack | fix/ri-050-macp-fail-closed       | RI-0-001                                                   | 15K      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
+| RI-3-001 | not-started | RI-N4: complete probe inventory mapping every TS and shell quality-rail check to one canonical check with disposition (preserve/strengthen/retire, each named)                                                                                                                   | #1275 | pi-glm-5.3 | mosaicstack/stack | docs/ri-050-qr-probe-inventory    | RI-0-001                                                   | 12K      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
+| RI-3-002 | not-started | RI-N4: TS evaluator absorbs effective shell probes; typed results (passed/failed/blocked/error/not-applicable) with versioned digested check definitions; shell commands become thin adapters; contract/parity/negative-control tests                                            | #1275 | pi-glm-5.3 | mosaicstack/stack | feat/ri-050-qr-evaluator          | RI-3-001                                                   | 30K      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
+| RI-4-001 | in-progress | RI-N3: one PRD application service — `mission --plan` persists mission↔PRD linkage (ids/versions/selected requirements); `mosaic prdy` routes through the service or becomes a named import/export adapter; Markdown is a labeled generated view; explicit conflict-aware import | #1275 | pi-glm-5.3 | mosaicstack/stack | feat/ri-050-prd-authority         | RI-0-001                                                   | 35K      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
+| RI-5-001 | not-started | RI-N5: typed freshness states (current/stale/partial/unknown/unavailable); no failed-fetch-renders-empty; stale derived verdicts → unknown; mutations disabled when stale; failure-matrix tests                                                                                  | #1275 | pi-glm-5.3 | mosaicstack/stack | feat/ri-050-web-stale-safety      | RI-0-001                                                   | 25K      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
+| RI-V-001 | not-started | Final verification + release evidence: all cards verified merged, negative controls demonstrated, real `next` publish run green on exact commit, evidence pack recorded                                                                                                          | #1275 | pi-glm-5.3 | mosaicstack/stack | docs/ri-050-release-evidence      | RI-1-002, RI-2-001, RI-2-002, RI-3-002, RI-4-001, RI-5-001 | 10K      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
+
+## Dispatch waves (max 2 parallel workers)
+
+1. RI-1-001 + RI-2-001
+2. RI-2-002 + RI-4-001
+3. RI-3-001 + RI-5-001
+4. RI-1-002 + RI-3-002
+5. RI-V-001
+
+## Budget
+
+Derived soft cap: 250K tokens (no explicit cap given). Projected total: 190K.
+Conservative mode (1 worker) above 70% projected; freeze above 90%.

docs/scratchpads/ri-050.md

@@ -0,0 +1,242 @@
+# Scratchpad — RI-050 orchestrator (jarvis, dragon-lin)
+
+Mission: alpha 0.0.50 release-integrity floor. Issue #1275. Base `next` @ 476db12b.
+Design SSOT: jarvis-brain `docs/plans/2026-08-16_mosaic-stack-sdlc-protocol.md` (SDLC-D-033..038).
+
+## Mode (Jason's directives)
+
+- Orchestrator: jarvis (this session, dragon-lin). NOT mos-claude; work stays on this host.
+- Workers: local pi headless — `pi --model zai/glm-5.3:high -p` in the card's worktree, tools read,bash,edit,write.
+- Delegation override of stack AGENTS.md `agent` column: rows carry `pi-glm-5.3` (outside cron table so no auto-claim).
+- Target branch: `next`. Cards branch from `origin/next`, squash-merge via PR.
+
+## Operational constraints (measured this session)
+
+- Main checkout at `/home/jwoltje/src/mosaic-stack` is a dirty diverged `main` (ahead 1139/behind 711) — NEVER touched. All work in `/home/jwoltje/src/mosaic-stack-worktrees/<branch>`.
+- Disk: /home 187G free. /tmp only 8.7G — keep pnpm stores/node_modules under /home.
+- `main` and `next` have DIVERGED; PRs target `next`.
+- Identity: pin `GITEA_LOGIN=mosaicstack-jarvis` for all wrapper ops. Issue #1275 verified authored by @jarvis.
+- `ci-queue-wait.sh` on this host is fail-open (board: fix #1032 not installed) — substitute SHA-status checks via `/commits/{sha}/status` and diff failing step names.
+- CI on PRs runs `pull_request` pipelines (any branch) incl. ci-postgres service. Push CI runs on main only; publish runs on push/tag to next + manual.
+- Wrapper gaps on this host per board (7 gaps; e.g. no pr-review-list, issue-assign broken, pr-merge makes no trailers): verify outcomes by reading back provider state, never trust rc alone.
+- Publish pipeline currently: install → build → publish-npm/publish-next-npm (+image). No verify. CI steps: install, sanitization, upgrade-guard, typecheck, lint, format, test, ci-postgres.
+
+## Budget
+
+Soft cap 250K. Projected 190K across 10 cards. Track per-card used vs estimate in TASKS.md notes.
+
+## Progress log
+
+- 2026-08-16 23:52 — Issue #1275 created (@jarvis verified).
+- 2026-08-16 23:5x — Bootstrap branch `docs/ri-050-mission-bootstrap` from origin/next@476db12b; PRD section + TASKS.md + this scratchpad written. RI-0-001 in-progress.
+
+## Wave 1 dispatched (2026-08-17 00:35)
+
+- RI-1-001 worker: pi glm-5.3:high, pid 2322125, worktree ri-1-001, log /var/tmp/ri-050/ri-1-001-run.log
+- RI-2-001 worker: pi glm-5.3:high, pid 2322126, worktree ri-2-001, log /var/tmp/ri-050/ri-2-001-run.log
+- Gotcha recorded: pi has no -f flag (that's pi-do.sh); pass brief as positional message. First launch died "Unknown option: -f" — relaunched.
+- CI lane: PR #1276 (bootstrap) fails `test` at base like every next PR — fred's green #1270 unblocks (comms sent 2026-08-17T05:21Z, `comms/20260817T052148Z__from-jarvis__650fe8.md`). Merge gate for all RI PRs queues behind #1270.
+- Live RI-N1 evidence posted to #1275 (comment 22915): pipeline 2439 publish-next-npm SUCCESS beside build-gateway FAILURE.
+
+---
+
+# HANDOFF — RI-050 continuation (written 2026-08-17 ~08:45 UTC, jarvis/dragon-lin)
+
+You are taking over the alpha 0.0.50 release-integrity workstream in place. Everything you
+need is on the remote. Read this whole file, then `docs/release-integrity/TASKS.md` (same
+branch), then the PRD section (`docs/PRD.md` § Release Integrity Workstream, same branch).
+
+## Identity / mode
+
+- Orchestrator identity: `jarvis` (dragon-lin). You continue as the RI-050 orchestrator under
+  whatever identity Jason gives you — if you are NOT jarvis, say so in comms and PR bodies.
+- Jason's standing directives for this mission: work happens on THIS repo (mosaicstack/stack),
+  PRs target `next` (NOT main), workers are local pi headless sessions on
+  `zai/glm-5.3:high`. Do not hand this to mos-claude. Do not borrow other seats' lanes.
+- All wrapper ops: pin `GITEA_LOGIN=mosaicstack-jarvis` (issue #1275 was verified authored by
+  @jarvis; keep identity consistent or verify yours with issue-view and READ BACK user.login).
+- CI substitution rule (this host's ci-queue-wait.sh is fail-open; fix #1032 not installed):
+  judge CI by SHA-status via `/api/v1/repos/mosaicstack/stack/commits/{sha}/status` or the
+  woodpecker API (`pipeline-status.sh -r mosaicstack/stack -n N -f json`), and DIFF THE
+  FAILING STEP NAMES rather than trusting rc.
+
+## Mission state at handoff
+
+Mission: alpha 0.0.50 release-integrity floor. Issue #1275 (open, has live-evidence comment).
+Decisions SDLC-D-033..038 live in jarvis-brain
+`docs/plans/2026-08-16_mosaic-stack-sdlc-protocol.md` (normative text also mirrored in the
+PRD section on this branch, so this repo is self-sufficient).
+
+Base: `origin/next` @ 476db12b. NOTE: `main` and `next` have DIVERGED — never base on main.
+
+Branches (all pushed, all clean trees):
+
+- `docs/ri-050-mission-bootstrap` @ 5114faa2 → PR #1276 (open, mergeable) — bootstrap docs +
+  this scratchpad + TASKS.md DAG. STATUS: CI red on `test` only, which is the known lane-wide
+  failure (see blocker below); own prettier issue already fixed.
+- `feat/ri-050-publish-gate` @ 0aa5ed35 → PR #1277 (open, mergeable) — RI-1-001 COMPLETE
+  (worker reported success, orchestrator review PASSED: verify step asserts CI_COMMIT_SHA ==
+  git rev-parse HEAD then runs canonical `pnpm verify:release`; every publish/image step
+  depends_on verify directly, confirmed by parsing the DAG: publish-npm, publish-next-npm,
+  build-gateway/appservice/web all -> [build, verify]; invariant test
+  scripts/verify-release.test.mjs passes 7/7 locally with negative fixtures). CI: same known
+  lane-red `test` step only.
+- `fix/ri-050-forge-fail-closed` @ 99b8f6ea → PR #1278 (open, mergeable) — RI-2-001 worker
+  reported success (typed `FORGE_*` capability errors, --simulate typed simulated everywhere,
+  vacuous true/echo gates replaced, closed ForgeOutcome set, 116 tests green incl. 16 new).
+  ORCHESTRATOR REVIEW NOT YET DONE — your first job. Review the diff
+  (1391 insertions across forge src), check the fail-closed paths and that simulated
+  results cannot satisfy any consumer, run `pnpm --filter @mosaicstack/forge test`.
+
+## The one blocker
+
+Every `next` PR pipeline is red on ONE assertion:
+`packages/mosaic/framework/tools/fleet/test-start-agent-session.sh:103` ("host provides 'pi'
+in the system path"). Pre-existing at base; affects PRs #1276/#1277/#1278 identically.
+fred's PR #1270 ("unblocks every PR on next") is green and open — it is HIS to merge; do not
+merge it yourself. jarvis sent comms (`comms/20260817T052148Z__from-jarvis__650fe8.md` in
+jarvis-brain) asking merge timing; no reply yet as of handoff. Merge gates for ALL RI PRs
+queue behind #1270 landing. Until then: review/develop freely, merge nothing that needs the
+green gate (docs-only #1276 arguably could merge red-lane with Jason's explicit call — ask,
+don't assume).
+
+## Remaining DAG (docs/release-integrity/TASKS.md is canonical)
+
+Wave 2 (next): RI-2-002 MACP fail-closed (brief pattern: mirror RI-2-001 for
+packages/macp/src/gate-runner.ts — empty commands, stub executors, unimplemented CI-provider
+gates fail closed; explicit simulate) and RI-4-001 PRD authority (one PRD service;
+@mosaicstack/prdy docs/prdy authoritative via `mosaic mission --plan`; `mosaic prdy` routes
+or becomes named Markdown adapter; mission<->PRD linkage persists — see PRD RI-N3).
+Wave 3: RI-3-001 probe inventory (docs), RI-5-001 web stale-safety.
+Wave 4: RI-1-002 negative-control tests, RI-3-002 TS evaluator absorbs shell probes.
+Final: RI-V-001 evidence pack (real green next publish run post-gate + all cards verified).
+
+## Worker mechanics (measured, reuse)
+
+- Dispatch: create worktree `git -C /home/jwoltje/src/mosaic-stack worktree add
+/home/jwoltje/src/mosaic-stack-worktrees/<id> -b <branch> origin/next`, write a brief to
+  /var/tmp/ri-050/, then run from INSIDE the worktree:
+  `pi -p --no-session --model zai/glm-5.3:high --tools read,bash,edit,write "$(cat brief.md)"`
+  (pi has NO -f flag — pass the brief as a positional message; first dispatch died on that).
+- Briefs for 1-001/2-001 are at /var/tmp/ri-050/ on dragon-lin (may not survive; the
+  pattern is fully described above and in TASKS.md).
+- Briefs must carry: worktree path, branch, base, requirements, known base-red list (so the
+  worker doesn't chase it), gates to run, PR creation command with GITEA_LOGIN pin, "do NOT
+  merge, do NOT touch docs/TASKS.md", and the JSON report format.
+- Verify worker claims: read the PR, run their tests yourself, parse pipeline step names.
+
+## Do-not-touch
+
+- Main checkout at /home/jwoltje/src/mosaic-stack (dirty diverged main) — never touch.
+- fred's open PRs (#1270 and others) — review evidence welcome, merging his is not yours.
+- Other RI PRs' authors' lanes: #1277/#1278 are yours to gate and merge ONCE lane is green
+  and review is recorded.
+- Never `--no-verify`; never bypass the wrapper-fails-closed rule (wrapper failure ⇒
+  `blocked + report exact command + stop`).
+
+## Session-restore command sequence
+
+1. `git -C /home/jwoltje/src/mosaic-stack-worktrees/ri-050 fetch origin --prune`
+2. Read this file + `docs/release-integrity/TASKS.md` + PRD section.
+3. Check PR states (#1270, #1276, #1277, #1278) and lane CI (SHA-status per above).
+4. Review RI-2-001 (PR #1278) if not yet done; then dispatch wave 2.
+
+— jarvis, 2026-08-17
+
+---
+
+# CONTINUATION — fargo (sb-it-1-dt)
+
+Orchestrator seat is now **fargo** on sb-it-1-dt (Jason, 2026-08-17): Claude seat, worktree discipline
+per fred's ruling (`~/agent-work/<slug>`, create → work → commit → push → remove as one act; the
+helper's `/src` refusal is a web1 convention, does not bind here). fred supports; lane rulings are
+his. Workers remain local pi `zai/glm-5.3:high` + limited Claude per Jason.
+
+## 2026-08-17 — RI-2-001 independent review DONE
+
+- **PR #1278 APPROVED** (Gitea review 172, pinned to head 99b8f6ea). Executed evidence, not read-only:
+  forge suite 116/116 at head (matches PR claim), forge lint green, forge typecheck green after
+  building `@mosaicstack/macp` dist (TS2307 on bare `pnpm install --frozen-lockfile` is a
+  minimal-install build-order artifact — the macp import is type-only, vitest passes unbuilt; CI
+  installs build workspace deps, hence green there), **workspace typecheck 45/45 at head**,
+  consumer sweep: no external type consumers of RunManifest/StageStatus/ForgeTaskResult/
+  TaskExecutor; only importer of the package is packages/mosaic via registerForgeCommand
+  (smoke test asserts registration/help only — cannot break). Digest gate (shaggy's) before==after
+  with both-arm reactivity controls.
+- CI red on #1276/#1277/#1278: lane-wide `test` failure only
+  (test-start-agent-session.sh:103, fred's guard mis-wired; #1270 unwires it). Fred measured log
+  content: one real byte-identical failure per pipeline (2456/2457/2458); 13 of ~14 `FAIL` grep
+  hits are passing fail-loud test NAMES. **The red carries no information about the RI changes.**
+- Non-blocking finding: README L141-143 + skills/mosaic-forge/SKILL.md document bare
+  `mosaic forge run`/`resume`, which now exits 1 FORGE_NO_EXECUTOR — fast-follow docs touch.
+- **Identity incident, ruled on by fred:** review 172 recorded under shared host principal
+  mos-dt-0, not fargo. Mechanism (measured, wrapper source): pr-review.sh resolves its acting login
+  from the tea login list only; no fargo tea login on this host → silent host-default fallback;
+  MOSAIC_GIT_IDENTITY is only read in detect-platform.sh get_gitea_token's fallback arm, never
+  reached. Exact-id read-back verifies against the writing token, so it passed while attribution
+  was wrong — durable-provenance machinery proves the write, not the seat. Fred's ruling: review
+  172 stands (substance/verdict/pin correct; label wrong); NO re-approval (one approval,
+  annotated, is the stronger record); fred posts the provenance correction under @fred with
+  --login fred-ms (hard-fail path); no fargo tea login ever (freeze + Jason's to authorize);
+  tooling gap filed by fred. Also explains (does not reopen) #1228's mos-dt-0 attribution.
+- Merge gate: all RI PRs queue behind fred's green #1270 (Jason's call).
+
+## Next
+
+1. Wave 2 dispatch: RI-2-002 (MACP fail-closed, mirror RI-2-001 pattern for
+   packages/macp/src/gate-runner.ts) + RI-4-001 (PRD authority). Two parallel workers max.
+2. Docs fast-follow (README + mosaic-forge skill) — fold into #1276 or a tiny docs card.
+3. RI-V-001 evidence at the end.
+
+— fargo, 2026-08-17
+
+---
+
+# RESUMPTION + DAILY-HANDOFF PROTOCOL (Jason, 2026-08-17)
+
+Orchestrator seat is back with **jarvis** (dragon-lin). Expect daily handoff between jarvis
+and fargo. Protocol (both seats, every handoff):
+
+1. **This file is the shared mission log.** Append a dated section per session: state
+   measured, actions taken, PR/review states, next actions. Never rewrite prior sections.
+2. **TASKS.md stays current within one session** — status, PR number in notes, review
+   evidence. Stale rows are handoff debt.
+3. **Cross-review rule (SDLC-D-011 in practice):** the reviewing seat must differ from the
+   producing seat. jarvis reviews fargo-dispatched PRs, fargo reviews jarvis-dispatched
+   PRs. Producers are always pi workers; dispatching seats verify before push; the other
+   seat records the Gitea review.
+4. Handoff = append here + push + (optional) issue #1275 comment if a decision changed.
+
+## RESUMED — jarvis/dragon-lin, 2026-08-17 (afternoon)
+
+- Measured: next = 8199261c (#1270 merged — lane unblocked for new PRs). #1293/#1294
+  (fargo, wave 2) CI-green, mergeable, no recorded reviews. #1276/#1277/#1278 still based
+  on 476db12b with stale red CI → need rebase onto 8199261c. #1278 review pinned to old
+  head 99b8f6ea by @mos-dt-0 (fargo's, mis-attributed per his note) — rebase will dismiss
+  it; re-approval must come from fargo/fred (author is @jarvis, cannot self-approve).
+- Live evidence #2: push pipeline 2462 (the #1270 merge itself) ran publish-next-npm
+  SUCCESS beside build-gateway FAILURE again.
+- Plan: rebase the three original branches; independently review #1293/#1294; merge order
+  once green+reviewed: #1276 (docs) → #1277 (publish gate) → #1278/#1293/#1294 (code).
+  After #1277 merges, watch the next push pipeline prove the verify gate live.
+- fargo's non-RI PRs (#1291/#1296/#1297/#1281) stay strictly his lane.
+
+## jarvis session 2026-08-17 (evening) — reviews, rebases, merge plan
+
+- Rebased #1276/#1277/#1278 onto 8199261c (heads 59e2c460 / 46784c8d / 4917df1f);
+  invariant tests 7/7 and forge 116/116 re-run green at new heads. #1270 touched
+  test-enumeration-exclusions.txt + package.json, NOT ci.yml — no semantic overlap with
+  #1277's ci.yml changes (checked, was a real concern).
+- Independent reviews recorded: #1293 APPROVED (review 173; macp 109/109; fail-closed paths
+  + aggregate state machine verified), #1294 APPROVED (review 174; prdy 20/20 + command
+  specs 9/9; single-writer + linkage persistence + labeled export + conflict-aware import
+  verified). Note: 19 unrelated mosaic suites fail on bare minimal install (known workspace
+  build-order artifact, documented by fargo) — not this change.
+- Measured: `next` has NO branch protection (API: only main listed). Cross-seat review
+  discipline is protocol-enforced, not Gitea-enforced. Flagged to fargo for Jason: direct
+  pushes to next trigger ungated publishes; protection is Jason's call (#1231 adjacent).
+- Merge order planned: #1276 (docs-only — no publish run) -> #1277 (first gated publish)
+  -> #1278 -> #1293 -> #1294. Sent fargo review requests with pinned head SHAs
+  (comms/20260818T011932Z__from-jarvis__a9c02b.md). Not merging #1293/#1294 before my three
+  clear fargo's review — order optimality beats speed; every pre-#1277 merge publishes ungated.
+- CI on the three rebased heads: pending at time of this entry.

package.json

@@ -9,6 +9,7 @@
     "preflight": "node scripts/preflight.mjs",
     "clean:generated": "node scripts/clean-generated.mjs",
     "typecheck": "pnpm preflight && turbo run typecheck",
+    "verify:release": "node scripts/verify-release.mjs",
     "test:checkout": "node --test scripts/*.test.mjs",
     "test": "pnpm test:checkout && turbo run test && pnpm run test:installer",
     "test:installer": "bash tools/install-next-lane.test.sh",

packages/mosaic/framework/fleet/README.md

@@ -12,6 +12,33 @@ The default tmux socket is `mosaic-fleet` so fleet commands do not touch the
 default tmux server. The roster is the desired-state authority; generated environment files are
 rebuildable projections, never a second source of configuration.
 
+## Brain-home split (fleet state vs framework templates)
+
+When a mosaic-brain clone is present, fleet **state** resolves from the brain
+home while framework templates and dispatch state stay in the config home
+(three-tree model, canon `docs/STRUCTURE-CANON.md` §2):
+
+| Path                                                                            | Without brain (legacy)                | With brain                     |
+| ------------------------------------------------------------------------------- | ------------------------------------- | ------------------------------ |
+| `fleet/agents/<seat>.env.*`                                                     | `~/.config/mosaic/fleet/agents/`      | `~/.mosaic/fleet/agents/`      |
+| `fleet/roles.local/` (overrides)                                                | `~/.config/mosaic/fleet/roles.local/` | `~/.mosaic/fleet/roles.local/` |
+| `fleet/profiles/` (working copies)                                              | `~/.config/mosaic/fleet/profiles/`    | `~/.mosaic/fleet/profiles/`    |
+| `fleet/roster.yaml`, `fleet/roles/` (baseline), `fleet/run/`, `fleet/services/` | `~/.config/mosaic/fleet/…`            | unchanged (config home)        |
+
+Activation (`packages/mosaic/src/fleet/brain-home.ts`, mirrored in
+`tools/fleet/start-agent-session.sh`):
+
+1. `MOSAIC_BRAIN_HOME` env var — explicit, always wins.
+2. Canonical `~/.mosaic` — adopted only when `MOSAIC_HOME` is the default
+   `~/.config/mosaic` AND `~/.mosaic/fleet/agents` exists. Custom
+   `--mosaic-home` values (tests, sandboxes, canaries) never adopt, keeping
+   them hermetic.
+3. Otherwise the config home (legacy single-tree behavior).
+
+Seat env dirs under a brain are subject to the same privacy boundary (0700
+dirs, 0600 files); `.env.generated` files are structure-valuable and tracked
+in the brain repo, hand-maintained `.env`/`.env.local` stay ignored and private.
+
 ## Examples
 
 - `examples/minimal.yaml` starts one local canary slot.

packages/mosaic/framework/tools/fleet/start-agent-session.sh

@@ -80,6 +80,26 @@ safe_path "$MOSAIC_HOME" || fail_env unsafe-path MOSAIC_HOME "$MOSAIC_HOME"
 
 FLEET_DIR="$MOSAIC_HOME/fleet"
 AGENT_ENV_DIR="$FLEET_DIR/agents"
+
+# Brain-home split (canon docs/STRUCTURE-CANON.md §2): seat launch envs live
+# under the brain home's fleet/agents when a brain is active; roster, roles
+# baseline, and runtime state (fleet/run) stay under MOSAIC_HOME.
+# Resolution mirrors packages/mosaic/src/fleet/brain-home.ts:
+#   1. MOSAIC_BRAIN_HOME env (explicit, always wins)
+#   2. ~/.mosaic — adopted only when MOSAIC_HOME is the default config home AND
+#      ~/.mosaic/fleet/agents exists
+#   3. MOSAIC_HOME (legacy single-tree)
+BRAIN_HOME="${MOSAIC_BRAIN_HOME:-}"
+if [ -z "$BRAIN_HOME" ]; then
+  BRAIN_HOME="$MOSAIC_HOME"
+  if [ "$(cd "$MOSAIC_HOME" 2>/dev/null && pwd -P)" = "$HOME/.config/mosaic" ] \
+     && [ -d "$HOME/.mosaic/fleet/agents" ]; then
+    BRAIN_HOME="$HOME/.mosaic"
+  fi
+fi
+if [ "$BRAIN_HOME" != "$MOSAIC_HOME" ]; then
+  AGENT_ENV_DIR="$BRAIN_HOME/fleet/agents"
+fi
 assert_managed_directory "$MOSAIC_HOME"
 assert_managed_directory "$FLEET_DIR"
 assert_private_directory "$AGENT_ENV_DIR"
@@ -233,36 +253,8 @@ assert_owned_tmux_server() {
     fail "tmux server ownership or environment validation failed"
 }
 
-# Lease-broker socket preflight (#1292). The gated runtime (`mosaic yolo …` →
-# launch-runtime.py) registers with the broker or dies ~4 seconds in, with the
-# diagnostic invisible because tmux destroys the dead pane. This check runs
-# BEFORE any tmux effect — including the ownership probe below — so a host
-# without a broker produces a named, surviving refusal instead of a doomed
-# pane. Exit 75 (EX_TEMPFAIL), distinct from 64 (bad projection) and 69 (host
-# not ready for other reasons); the agent@ unit is Type=oneshot with no
-# Restart=, so the failed unit keeps its message instead of looping. Socket
-# resolution matches launch.ts's defaultLeaseBrokerSocket precedence exactly.
-# This preflight DETECTS and REFUSES — it never starts the broker (activation
-# belongs to the fleet control plane; a component that both detects and fixes
-# cannot be used to measure whether the fix worked).
-broker_socket_path() {
-  if [ -n "${MOSAIC_LEASE_BROKER_SOCKET:-}" ]; then
-    printf '%s\n' "$MOSAIC_LEASE_BROKER_SOCKET"
-    return 0
-  fi
-  local runtime_dir="${XDG_RUNTIME_DIR:-/run/user/$(id -u)}"
-  printf '%s\n' "${runtime_dir}/mosaic-lease/broker.sock"
-}
-
-if [ "$MODE" = "launch" ]; then
-  _broker_socket=$(broker_socket_path)
-  if [ ! -S "$_broker_socket" ]; then
-    echo "[fleet] FAIL_LAUNCH broker-absent: lease broker socket ${_broker_socket} missing; runtime launch denied (#1292)." >&2
-    echo "[fleet] remedy: systemctl --user enable --now mosaic-lease-broker.service  (or reinstall via: mosaic fleet install)" >&2
-    exit 75
-  fi
-fi
-
+# Validate exact server ownership before querying, cleaning, or creating any
+# managed session. An unmanaged or contaminated named socket is never repaired.
 assert_owned_tmux_server
 
 if [ "$MODE" = interaction ]; then

packages/mosaic/framework/tools/fleet/test-agent-session-broker-preflight.sh

@@ -1,216 +0,0 @@
-#!/usr/bin/env bash
-# CI-fit regression suite for the #1292 lease-broker socket preflight in
-# start-agent-session.sh.
-#
-# WHY THIS SUITE IS CI-FIT WHERE test-start-agent-session.sh IS NOT (#1017/#1270
-# context): that older suite's precondition is "the host does not have the pi
-# binary", which a CI image that ships pi violates — its guard correctly
-# refuses to report a pass there, so it is excluded from the chain. THIS suite
-# controls its own preconditions instead of inheriting them from the host: a
-# fake tmux on PATH, a fake mosaic on PATH, a real unix socket created in a
-# tmpdir, a hermetic env (env -i, fake HOME, GIT_CONFIG_GLOBAL severed). It
-# never depends on what the host has installed, so a green here means the same
-# thing on every host. Anyone adding cases: keep that property — no case may
-# depend on host state.
-#
-# The failure this suite is written down to catch (#1292): a seat launched on a
-# host with no lease broker dies ~4 seconds in at registration, with the
-# diagnostic invisible because tmux destroys the dead pane. The preflight runs
-# BEFORE any tmux effect and refuses with a NAMED code (exit 75, EX_TEMPFAIL)
-# so the message survives. The agent@ unit is Type=oneshot with no Restart=,
-# so a failed unit keeps its output instead of looping.
-#
-# Cases:
-#   1. absent socket -> exit 75, message names broker-absent + socket path +
-#      remedy, and NO tmux session was ever created (the doomed-pane half).
-#   2. present socket (real unix socket in tmpdir) -> proceeds PAST the
-#      preflight (the suite then stops at the next precondition, proving the
-#      preflight was not the refusal).
-#   3. explicit MOSAIC_LEASE_BROKER_SOCKET wins over XDG_RUNTIME_DIR default.
-#   4. --stop mode does NOT require the broker (teardown must not be fenced on
-#      a component whose absence is exactly what teardown may follow).
-#
-# Sabotage control, run by the developer (not in-suite): remove the preflight
-# block from start-agent-session.sh, re-run — case 1 fails (a tmux session is
-# created / exit is not 75), cases 2-4 still pass; restore byte-identically.
-
-set -euo pipefail
-
-SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
-WORK_DIR="${MOSAIC_TEST_WORK_DIR:-$PWD/.mosaic-test-work/agent-session-broker-preflight}"
-FAKE_HOME="$WORK_DIR/home"
-BIN_DIR="$WORK_DIR/bin"
-ENV_DIR="$WORK_DIR/env"
-SOCK_DIR="$WORK_DIR/sockets"
-LOG_FILE="$WORK_DIR/tmux-calls.log"
-
-rm -rf "$WORK_DIR"
-# The script asserts a managed directory tree under MOSAIC_HOME: mosaic/,
-# mosaic/fleet/, mosaic/fleet/agents/ — private (0700/0750-style) modes, no
-# symlinks — plus a per-agent env projection. Build the full tree the launcher
-# expects so the suite reaches the BROKER preflight rather than dying at
-# environment validation.
-mkdir -p "$FAKE_HOME/.config/mosaic/fleet/agents" "$BIN_DIR" "$SOCK_DIR"
-chmod 700 "$FAKE_HOME/.config/mosaic" "$FAKE_HOME/.config/mosaic/fleet/agents"
-chmod 750 "$FAKE_HOME/.config/mosaic/fleet"
-cat > "$FAKE_HOME/.config/mosaic/fleet/agents/preflight-test.env.generated" <<'ENVEOF'
-MOSAIC_AGENT_NAME=preflight-test
-MOSAIC_AGENT_CLASS=worker
-MOSAIC_AGENT_RUNTIME=pi
-MOSAIC_AGENT_MODEL=
-MOSAIC_AGENT_REASONING=
-MOSAIC_AGENT_TOOL_POLICY=code
-MOSAIC_AGENT_WORKDIR=/tmp
-MOSAIC_TMUX_SOCKET=mosaic-fleet
-ENVEOF
-chmod 600 "$FAKE_HOME/.config/mosaic/fleet/agents/preflight-test.env.generated"
-
-# ─── Fake tmux: records every invocation; new-session marks the marker. ────
-: > "$LOG_FILE"
-cat > "$BIN_DIR/tmux" <<SH
-#!/usr/bin/env bash
-printf 'tmux %s\n' "\$*" >> "$LOG_FILE"
-if [[ "\$*" == *new-session* ]]; then
-  echo "TMUX-NEW-SESSION-INVOKED" >> "$LOG_FILE"
-fi
-exit 0
-SH
-chmod +x "$BIN_DIR/tmux"
-
-# ─── Fake mosaic/pi binaries so the script proceeds past its own lookups. ───
-for bin in mosaic pi claude; do
-  printf '#!/usr/bin/env bash\nexit 0\n' > "$BIN_DIR/$bin"
-  chmod +x "$BIN_DIR/$bin"
-done
-
-# ─── Minimal launch environment the script expects. ────────────────────────
-# (Enough for the preflight to be reached; later stages will still fail in
-# case 2 — that is expected and asserted.)
-run_session_script() {
-  local mode="$1"; shift
-  (
-    cd "$WORK_DIR"
-    env -i HOME="$FAKE_HOME" PATH="$BIN_DIR:/usr/bin:/bin" \
-      GIT_CONFIG_GLOBAL=/dev/null GIT_CONFIG_SYSTEM=/dev/null \
-      MOSAIC_HOME="$FAKE_HOME/.config/mosaic" \
-      AGENT_NAME=preflight-test \
-      "$@" \
-      bash "$SCRIPT_DIR/start-agent-session.sh" $mode preflight-test
-  )
-}
-
-fail=0
-assert() {
-  local desc="$1" expected="$2" actual="$3"
-  if [[ "$expected" != "$actual" ]]; then
-    echo "FAIL: $desc — expected '$expected', got '$actual'" >&2
-    fail=1
-  fi
-}
-assert_contains() {
-  local desc="$1" haystack="$2" needle="$3"
-  [[ "$haystack" == *"$needle"* ]] || { echo "FAIL: $desc — missing '$needle' in: $haystack" >&2; fail=1; }
-}
-assert_not_contains() {
-  local desc="$1" haystack="$2" needle="$3"
-  if [[ "$haystack" == *"$needle"* ]]; then
-    echo "FAIL: $desc — must not contain '$needle'" >&2
-    fail=1
-  fi
-  return 0
-}
-
-# ─── 1. Absent socket → named refusal, NO tmux session. ────────────────────
-: > "$LOG_FILE"
-stderr_file="$WORK_DIR/stderr-1.tmp"
-set +e
-out=$(run_session_script "" MOSAIC_LEASE_BROKER_SOCKET="$SOCK_DIR/absent.sock" 2>"$stderr_file")
-rc=$?
-set -e
-assert "absent socket exit code" "75" "$rc"
-err=$(cat "$stderr_file")
-assert_contains "absent socket names the failure" "$err" "FAIL_LAUNCH broker-absent"
-assert_contains "absent socket names the socket path" "$err" "$SOCK_DIR/absent.sock"
-assert_contains "absent socket names a remedy" "$err" "mosaic fleet install"
-log1=$(cat "$LOG_FILE")
-assert_not_contains "absent socket must not create a tmux session" "$log1" "TMUX-NEW-SESSION-INVOKED"
-
-# ─── 2. Present socket → passes the preflight. ─────────────────────────────
-# Expected: ownership/env checks AFTER the preflight may refuse (fixture is
-# minimal by design); the assertion is only that the refusal is NOT
-# broker-absent and the exit is NOT 75.
-# Create a REAL unix socket: a detached python holder binds it and stays alive
-# for the duration (bash cannot create sockets; a foreground python would
-# close the socket on exit and -S on a closed-but-unlinked path fails). Written
-# as a script file + setsid nohup so no job-control/heredoc interaction with
-# set -e can silently kill the suite.
-# AF_UNIX binds cap at 108 path bytes; the suite's workdir exceeds that, so
-# the live socket lives at a SHORT path under /tmp (unique per run, cleaned
-# with the suite). The preflight takes its socket path explicitly, so this
-# stays fully controlled.
-LIVE_SOCK=$(mktemp -u /tmp/mosaic-preflight-XXXXXX.sock)
-trap 'rm -f "$LIVE_SOCK"' EXIT
-rm -f "$SOCK_DIR/live.sock" "$LIVE_SOCK"
-cat > "$SOCK_DIR/holder.py" <<'PY'
-import socket, sys, time
-path = sys.argv[1]
-s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
-s.bind(path)
-s.listen(1)
-time.sleep(120)
-PY
-python3 "$SOCK_DIR/holder.py" "$LIVE_SOCK" >/dev/null 2>"$SOCK_DIR/holder.err" &
-HOLDER_PID=$!
-# Wait for the socket object to exist (bind is near-instant, but do not race it).
-for _ in $(seq 1 50); do
-  [ -S "$LIVE_SOCK" ] && break
-  sleep 0.1
-done
-if [ ! -S "$LIVE_SOCK" ]; then
-  echo "FAIL: could not create live socket fixture (holder pid $HOLDER_PID)" >&2
-  ps -p "$HOLDER_PID" -o pid,stat,cmd --no-headers >&2 || echo "(holder exited)" >&2
-  cat "$SOCK_DIR/holder.err" >&2 || true
-  exit 1
-fi
-: > "$LOG_FILE"
-set +e
-out=$(run_session_script "" MOSAIC_LEASE_BROKER_SOCKET="$LIVE_SOCK" 2>"$WORK_DIR/stderr-2.tmp")
-rc=$?
-set -e
-# The preflight PASSED if the failure (whatever later stage refused) is NOT
-# the broker refusal, and tmux was reached or a later precondition named
-# something else.
-err2=$(cat "$WORK_DIR/stderr-2.tmp")
-assert_not_contains "live socket must not refuse broker-absent" "$err2" "broker-absent"
-if [[ "$rc" == "75" ]]; then
-  echo "FAIL: live socket — preflight still refused (exit 75) with a live socket" >&2
-  fail=1
-fi
-
-# ─── 3. Explicit socket env wins over XDG default. ─────────────────────────
-set +e
-out=$(run_session_script "" XDG_RUNTIME_DIR="$SOCK_DIR/no-runtime-here" MOSAIC_LEASE_BROKER_SOCKET="$SOCK_DIR/absent2.sock" 2>"$WORK_DIR/stderr-3.tmp")
-rc=$?
-set -e
-assert "explicit env wins (exit 75)" "75" "$rc"
-assert_contains "explicit env path named" "$(cat "$WORK_DIR/stderr-3.tmp")" "$SOCK_DIR/absent2.sock"
-
-# ─── 4. --stop is not fenced on the broker. ────────────────────────────────
-: > "$LOG_FILE"
-set +e
-out=$(run_session_script "--stop" MOSAIC_LEASE_BROKER_SOCKET="$SOCK_DIR/absent3.sock" 2>"$WORK_DIR/stderr-4.tmp")
-rc=$?
-set -e
-err4=$(cat "$WORK_DIR/stderr-4.tmp")
-assert_not_contains "--stop must not refuse broker-absent" "$err4" "broker-absent"
-if [[ "$rc" == "75" ]]; then
-  echo "FAIL: --stop — exit 75 means teardown was fenced on the broker" >&2
-  fail=1
-fi
-
-kill "$HOLDER_PID" 2>/dev/null || true
-
-if [[ "$fail" -eq 0 ]]; then
-  echo "start-agent-session lease-broker preflight regression passed"
-fi
-exit "$fail"

packages/mosaic/framework/tools/fleet/test-start-agent-session.sh

@@ -167,6 +167,54 @@ if echo "$valid_args" | grep -qF 'bash -c'; then
   fail "launcher constructed a shell command payload"
 fi
 
+# ── Brain-home split (canon §2) ─────────────────────────────────────────
+# When MOSAIC_HOME is the default config home under $HOME and the host carries
+# $HOME/.mosaic/fleet/agents, seat envs resolve from the brain tree; the config
+# home still owns fleet/run (holder-owner) and remains a managed boundary.
+: > "$TMUX_CALLS"
+HOME_BRAIN="$ROOT/brain-home"
+CONFIG_HOME="$HOME_BRAIN/.config/mosaic"
+BRAIN="$HOME_BRAIN/.mosaic"
+mkdir -p "$CONFIG_HOME/fleet/run" "$BRAIN/fleet/agents" "$HOME_BRAIN/work"
+chmod 700 "$CONFIG_HOME" "$CONFIG_HOME/fleet" "$CONFIG_HOME/fleet/run" \
+  "$BRAIN/fleet/agents" "$HOME_BRAIN/work"
+printf '123e4567-e89b-12d3-a456-426614174000\n' > "$CONFIG_HOME/fleet/run/holder-owner"
+chmod 600 "$CONFIG_HOME/fleet/run/holder-owner"
+cat > "$BRAIN/fleet/agents/coder-brain.env.generated" <<EOF
+MOSAIC_AGENT_NAME=coder-brain
+MOSAIC_AGENT_CLASS=code
+MOSAIC_AGENT_RUNTIME=pi
+MOSAIC_AGENT_MODEL=openai-codex/gpt-5.6-sol
+MOSAIC_AGENT_REASONING=high
+MOSAIC_AGENT_TOOL_POLICY=code
+MOSAIC_AGENT_WORKDIR=$HOME_BRAIN/work
+MOSAIC_TMUX_SOCKET=mosaic-test
+EOF
+chmod 600 "$BRAIN/fleet/agents/coder-brain.env.generated"
+install_pane_binaries "$HOME_BRAIN"
+HOME="$HOME_BRAIN" PATH="$FAKE_BIN:$PATH" MOSAIC_TEST_TMUX_CALLS="$TMUX_CALLS" \
+  MOSAIC_TEST_PANE_PID=$$ MOSAIC_TEST_HOME="$HOME_BRAIN" \
+  MOSAIC_TEST_FLEET_OWNER=123e4567-e89b-12d3-a456-426614174000 \
+  MOSAIC_HOME="$CONFIG_HOME" "$START" coder-brain
+brain_args=$(tr '\0' '\n' < "$TMUX_CALLS")
+echo "$brain_args" | grep -qF new-session || fail "brain-home generated projection did not reach tmux"
+echo "$brain_args" | grep -qF 'coder-brain' || fail "brain-home agent env was not the launch source"
+[ -f "$BRAIN/fleet/agents/coder-brain.env.generated" ] || fail "brain generated env vanished"
+
+# Negative control: the SAME default-config-home shape but without
+# ~/.mosaic/fleet/agents — the config-home env tree is used directly (legacy).
+: > "$TMUX_CALLS"
+HOME_NOBRAIN="$ROOT/brainless-home"
+CONFIG_HOME_NOBRAIN="$HOME_NOBRAIN/.config/mosaic"
+write_generated "$CONFIG_HOME_NOBRAIN" "coder-legacy"
+install_pane_binaries "$HOME_NOBRAIN"
+HOME="$HOME_NOBRAIN" PATH="$FAKE_BIN:$PATH" MOSAIC_TEST_TMUX_CALLS="$TMUX_CALLS" \
+  MOSAIC_TEST_PANE_PID=$$ MOSAIC_TEST_HOME="$HOME_NOBRAIN" \
+  MOSAIC_TEST_FLEET_OWNER=123e4567-e89b-12d3-a456-426614174000 \
+  MOSAIC_HOME="$CONFIG_HOME_NOBRAIN" "$START" coder-legacy
+legacy_args=$(tr '\0' '\n' < "$TMUX_CALLS")
+echo "$legacy_args" | grep -qF new-session || fail "legacy single-tree launch regressed"
+
 # The pane must start through an absolute clean-environment boundary. Its
 # runtime command remains an argv vector, but no holder/session environment
 # control variable can pass through the pane command.

packages/mosaic/src/commands/fleet-agent-crud-command.ts

@@ -1,5 +1,6 @@
 import { readFile } from 'node:fs/promises';
 import { join, resolve } from 'node:path';
+import { fleetAgentEnvDir, fleetRolesLocalDir } from '../fleet/brain-home.js';
 import type { Command } from 'commander';
 import {
   executeFleetAgentMutation,
@@ -149,9 +150,9 @@ async function executeCommand(
     request,
     mosaicHome,
     rosterPath,
-    agentEnvDir: join(mosaicHome, 'fleet', 'agents'),
+    agentEnvDir: fleetAgentEnvDir(mosaicHome),
     rolesDir: join(mosaicHome, 'fleet', 'roles'),
-    overrideDir: join(mosaicHome, 'fleet', 'roles.local'),
+    overrideDir: fleetRolesLocalDir(mosaicHome),
     dryRun: forceDryRun || opts.dryRun === true,
     ...(deps.projectionApplier === undefined ? {} : { projectionApplier: deps.projectionApplier }),
   });

packages/mosaic/src/commands/fleet-migration-command.ts

@@ -1,5 +1,6 @@
 import { readFile } from 'node:fs/promises';
 import { join } from 'node:path';
+import { fleetAgentEnvDir, fleetRolesLocalDir } from '../fleet/brain-home.js';
 import type { Command } from 'commander';
 import {
   parseV1MigrationObservations,
@@ -120,11 +121,11 @@ export function registerFleetMigrationCommand(
           observations,
           personaDirs: {
             rolesDir: deps.rolesDir ?? join(mosaicHome, 'fleet', 'roles'),
-            overrideDir: deps.overrideDir ?? join(mosaicHome, 'fleet', 'roles.local'),
+            overrideDir: deps.overrideDir ?? fleetRolesLocalDir(mosaicHome),
           },
           environment: {
             mosaicHome,
-            agentEnvDir: join(mosaicHome, 'fleet', 'agents'),
+            agentEnvDir: fleetAgentEnvDir(mosaicHome),
           },
         });
         printJson(preview);

packages/mosaic/src/commands/fleet-personas.ts

@@ -30,19 +30,21 @@ import { lstat, readFile, readdir, stat } from 'node:fs/promises';
 import { homedir } from 'node:os';
 import { basename, isAbsolute, join, sep } from 'node:path';
 import type { Command } from 'commander';
+import { fleetRolesLocalDir } from '../fleet/brain-home.js';
 
 function defaultMosaicHome(): string {
   return process.env['MOSAIC_HOME'] ?? join(homedir(), '.config', 'mosaic');
 }
 
-/** Baseline persona role contracts (reseeded on update). */
+/** Baseline persona role contracts (reseeded on update; config home — framework). */
 export function defaultRolesDir(mosaicHome = defaultMosaicHome()): string {
   return join(mosaicHome, 'fleet', 'roles');
 }
 
-/** PRESERVE-protected override layer (survives update; wins on merge). */
+/** PRESERVE-protected override layer (survives update; wins on merge).
+ * Brain home (`~/.mosaic/fleet/roles.local`) when a brain is active. */
 export function defaultOverrideDir(mosaicHome = defaultMosaicHome()): string {
-  return join(mosaicHome, 'fleet', 'roles.local');
+  return fleetRolesLocalDir(mosaicHome);
 }
 
 /**

packages/mosaic/src/commands/fleet-place-unit.spec.ts

@@ -1,177 +0,0 @@
-import { lstat, mkdir, mkdtemp, readFile, rm, symlink, writeFile } from 'node:fs/promises';
-import { tmpdir } from 'node:os';
-import { join } from 'node:path';
-import { afterEach, describe, expect, it } from 'vitest';
-
-import { placeUnitFile, resolveLeaseBrokerSocketForPreflight } from './fleet.js';
-
-/**
- * Unit-placement regression harness for #1292.
- *
- * The two measured defects this suite pins:
- *  1. `systemctl enable <name>` does NOT rewrite an existing by-path
- *     wants-symlink — so placement must remove stale residue explicitly, and
- *     acceptance asserts on the RESULTING SYMLINK TARGET, never on the enable
- *     call's argument (asserting the call cannot see where the link ended up).
- *  2. Node's copyFile FOLLOWS a by-path symlink at the destination and
- *     overwrites the SEED template. Acceptance asserts on the SEED's bytes
- *     AND mtime — unchanged — which is the only check that can redden for
- *     finding 2. The symlink-target assertion catches finding 1; these are
- *     different defects with different failure modes.
- *
- * Fixtures are entirely inside tmpdirs (source template, active systemd dir,
- * wants dir) — no real host paths are touched by this suite.
- */
-
-describe('placeUnitFile (#1292 unit placement)', () => {
-  const cleanup: string[] = [];
-  afterEach(async () => {
-    while (cleanup.length > 0) {
-      await rm(cleanup.pop()!, { recursive: true, force: true });
-    }
-  });
-
-  async function fixture() {
-    const root = await mkdtemp(join(tmpdir(), 'place-unit-'));
-    cleanup.push(root);
-    const seedDir = join(root, 'seed');
-    const activeDir = join(root, 'active');
-    await mkdir(seedDir, { recursive: true });
-    await mkdir(activeDir, { recursive: true });
-    const seedTemplate = join(seedDir, 'unit-under-test.service');
-    await writeFile(
-      seedTemplate,
-      '[Unit]\nDescription=seed template\n[Service]\nType=oneshot\nExecStart=/bin/true\n[Install]\nWantedBy=default.target\n',
-    );
-    const activeSource = join(root, 'active-source.service');
-    await writeFile(
-      activeSource,
-      '[Unit]\nDescription=active copy v2\n[Service]\nType=oneshot\nExecStart=/bin/true\n[Install]\nWantedBy=default.target\n',
-    );
-    return { root, seedDir, activeDir, seedTemplate, activeSource };
-  }
-
-  it('places a regular file on a clean host (negative control: no residue anywhere)', async () => {
-    const f = await fixture();
-    const result = await placeUnitFile(f.activeSource, f.activeDir, 'unit-under-test.service');
-    expect(result.unlinkedDestinationSymlink).toBe(false);
-    expect(result.removedStaleWantsSymlink).toBe(false);
-    const info = await lstat(join(f.activeDir, 'unit-under-test.service'));
-    expect(info.isSymbolicLink()).toBe(false);
-    expect(await readFile(join(f.activeDir, 'unit-under-test.service'), 'utf8')).toContain(
-      'active copy v2',
-    );
-    // Seed untouched by construction — but assert it, so the clean-host case
-    // cannot silently regress into seed-mutation.
-    expect(await readFile(f.seedTemplate, 'utf8')).toContain('seed template');
-  });
-
-  it('by-path residue: unlinks destination symlink, places the file, seed bytes AND mtime unchanged (finding 2)', async () => {
-    const f = await fixture();
-    const seedBefore = await readFile(f.seedTemplate, 'utf8');
-    const mtimeBefore = (await lstat(f.seedTemplate)).mtimeMs;
-    // The fomo-lin convention: by-path enable left a symlink AT the unit name
-    // pointing at the seed template, plus a wants-symlink doing the same.
-    await symlink(f.seedTemplate, join(f.activeDir, 'unit-under-test.service'));
-    const wantsDir = join(f.activeDir, 'default.target.wants');
-    await mkdir(wantsDir, { recursive: true });
-    await symlink(f.seedTemplate, join(wantsDir, 'unit-under-test.service'));
-
-    const result = await placeUnitFile(f.activeSource, f.activeDir, 'unit-under-test.service');
-    expect(result.unlinkedDestinationSymlink).toBe(true);
-    expect(result.removedStaleWantsSymlink).toBe(true);
-
-    // FINDING 2's check: the seed is byte-identical and its mtime did not move.
-    expect(await readFile(f.seedTemplate, 'utf8')).toBe(seedBefore);
-    expect((await lstat(f.seedTemplate)).mtimeMs).toBe(mtimeBefore);
-
-    // The destination is now a regular file carrying the ACTIVE content.
-    const destInfo = await lstat(join(f.activeDir, 'unit-under-test.service'));
-    expect(destInfo.isSymbolicLink()).toBe(false);
-    expect(await readFile(join(f.activeDir, 'unit-under-test.service'), 'utf8')).toContain(
-      'active copy v2',
-    );
-  });
-
-  it('by-path residue: no wants-symlink remains pointing at the seed (finding 1 residue cleared)', async () => {
-    const f = await fixture();
-    await symlink(f.seedTemplate, join(f.activeDir, 'unit-under-test.service'));
-    const wantsDir = join(f.activeDir, 'default.target.wants');
-    await mkdir(wantsDir, { recursive: true });
-    await symlink(f.seedTemplate, join(wantsDir, 'unit-under-test.service'));
-
-    await placeUnitFile(f.activeSource, f.activeDir, 'unit-under-test.service');
-
-    // After placement the stale wants link is GONE (enable-by-name recreates
-    // it correctly). A link still present must not point at the seed.
-    try {
-      const link = await lstat(join(wantsDir, 'unit-under-test.service'));
-      if (link.isSymbolicLink()) {
-        const target = await readFile(join(wantsDir, 'unit-under-test.service'), 'utf8').catch(
-          async () => '',
-        );
-        expect(target).not.toContain('seed template');
-      }
-    } catch {
-      // absent wants link — the expected post-placement state
-    }
-  });
-
-  it('idempotence: second placement on a reconciled host is a no-op producing the identical final state', async () => {
-    const f = await fixture();
-    // Reconciled starting state: regular file at the name, wants link to the active copy.
-    await writeFile(
-      join(f.activeDir, 'unit-under-test.service'),
-      await readFile(f.activeSource, 'utf8'),
-    );
-    const wantsDir = join(f.activeDir, 'default.target.wants');
-    await mkdir(wantsDir, { recursive: true });
-    await symlink(
-      join(f.activeDir, 'unit-under-test.service'),
-      join(wantsDir, 'unit-under-test.service'),
-    );
-    const before = await readFile(join(f.activeDir, 'unit-under-test.service'), 'utf8');
-
-    const result = await placeUnitFile(f.activeSource, f.activeDir, 'unit-under-test.service');
-    // No destructive step fired: no unlink, no wants removal.
-    expect(result.unlinkedDestinationSymlink).toBe(false);
-    expect(result.removedStaleWantsSymlink).toBe(false);
-    // Identical final state.
-    expect(await readFile(join(f.activeDir, 'unit-under-test.service'), 'utf8')).toBe(before);
-    const link = await lstat(join(wantsDir, 'unit-under-test.service'));
-    expect(link.isSymbolicLink()).toBe(true);
-  });
-
-  it('double install on by-path residue converges to the identical reconciled state', async () => {
-    const f = await fixture();
-    await symlink(f.seedTemplate, join(f.activeDir, 'unit-under-test.service'));
-    const wantsDir = join(f.activeDir, 'default.target.wants');
-    await mkdir(wantsDir, { recursive: true });
-    await symlink(f.seedTemplate, join(wantsDir, 'unit-under-test.service'));
-
-    await placeUnitFile(f.activeSource, f.activeDir, 'unit-under-test.service');
-    const first = await readFile(join(f.activeDir, 'unit-under-test.service'), 'utf8');
-    const secondRun = await placeUnitFile(f.activeSource, f.activeDir, 'unit-under-test.service');
-    const second = await readFile(join(f.activeDir, 'unit-under-test.service'), 'utf8');
-    expect(secondRun.unlinkedDestinationSymlink).toBe(false);
-    expect(second).toBe(first);
-  });
-});
-
-describe('resolveLeaseBrokerSocketForPreflight (#1292 preflight resolution)', () => {
-  it('explicit MOSAIC_LEASE_BROKER_SOCKET wins', () => {
-    expect(
-      resolveLeaseBrokerSocketForPreflight({ MOSAIC_LEASE_BROKER_SOCKET: '/custom/sock' }, 1000),
-    ).toBe('/custom/sock');
-  });
-  it('XDG_RUNTIME_DIR next', () => {
-    expect(resolveLeaseBrokerSocketForPreflight({ XDG_RUNTIME_DIR: '/run/user/1001' }, 1000)).toBe(
-      '/run/user/1001/mosaic-lease/broker.sock',
-    );
-  });
-  it('falls back to /run/user/<uid>', () => {
-    expect(resolveLeaseBrokerSocketForPreflight({}, 1002)).toBe(
-      '/run/user/1002/mosaic-lease/broker.sock',
-    );
-  });
-});

packages/mosaic/src/commands/fleet-profiles.ts

@@ -25,6 +25,7 @@ import { homedir } from 'node:os';
 import { basename, join } from 'node:path';
 import type { Command } from 'commander';
 import YAML from 'yaml';
+import { fleetProfilesDir } from '../fleet/brain-home.js';
 import {
   defaultOverrideDir,
   extractClassesFromDir,
@@ -36,9 +37,10 @@ function defaultMosaicHome(): string {
   return process.env['MOSAIC_HOME'] ?? join(homedir(), '.config', 'mosaic');
 }
 
-/** Directory holding the seeded profile yaml files. */
+/** Directory holding the seeded profile yaml files — brain home when active
+ * (user working copies, committed), else the config home seed. */
 export function defaultProfilesDir(mosaicHome = defaultMosaicHome()): string {
-  return join(mosaicHome, 'fleet', 'profiles');
+  return fleetProfilesDir(mosaicHome);
 }
 
 /** Directory holding the persona role contracts. */

packages/mosaic/src/commands/fleet-regen-command.ts

@@ -3,6 +3,7 @@ import { homedir } from 'node:os';
 import { join, relative, resolve } from 'node:path';
 import type { Command } from 'commander';
 import type { CommandRunner } from './fleet.js';
+import { fleetAgentEnvDir } from '../fleet/brain-home.js';
 import {
   applyPreparedGeneratedAgentEnvironmentProjection,
   prepareGeneratedAgentEnvironmentProjection,
@@ -153,7 +154,7 @@ export async function executeFleetRegen(
   options: FleetRegenOptions,
 ): Promise<FleetRegenResult> {
   const mosaicHome = defaultMosaicHome(deps);
-  const agentEnvDir = join(mosaicHome, 'fleet', 'agents');
+  const agentEnvDir = fleetAgentEnvDir(mosaicHome);
   const rosterPath = join(mosaicHome, 'fleet', 'roster.yaml');
   const readRoster = deps.readRoster ?? defaultReadRoster(deps, mosaicHome);
   const prepare = deps.prepareProjection ?? prepareGeneratedAgentEnvironmentProjection;

packages/mosaic/src/commands/fleet.spec.ts

@@ -835,25 +835,13 @@ describe('fleet command construction', () => {
     };
     const program = new Command();
     program.exitOverride();
-    // #1292: inject a present broker socket so the preflight passes and this
-    // spec keeps testing its ORIGINAL property (holder-before-agent ordering).
-    // The preflight's own refusal behavior has dedicated specs below.
-    registerFleetCommand(program, {
-      runner,
-      mosaicHome: home,
-      checkBrokerSocket: async () => true,
-    });
+    registerFleetCommand(program, { runner, mosaicHome: home });
 
     try {
       await program.parseAsync(['node', 'mosaic', 'fleet', 'start']);
       await program.parseAsync(['node', 'mosaic', 'fleet', 'stop']);
 
       expect(calls).toEqual([
-        // #1292: fleet start enables + starts the broker FIRST (enable is
-        // idempotent; the unit exists after install), re-checking the socket
-        // before any holder/agent lifecycle effect.
-        ['systemctl', '--user', 'enable', 'mosaic-lease-broker.service'],
-        ['systemctl', '--user', 'start', 'mosaic-lease-broker.service'],
         ['systemctl', '--user', 'start', 'mosaic-tmux-holder.service'],
         ['systemctl', '--user', 'start', '[email protected]'],
         ['systemctl', '--user', 'stop', '[email protected]'],
@@ -864,92 +852,6 @@ describe('fleet command construction', () => {
     }
   });
 
-  it('fleet start refuses with a named error when the broker socket does not appear (#1292)', async () => {
-    const home = await tempDir();
-    const rosterPath = join(home, 'fleet', 'roster.yaml');
-    await mkdir(join(home, 'fleet'), { recursive: true });
-    await writeFile(
-      rosterPath,
-      ['version: 1', 'transport: tmux', 'agents:', '  - name: coder0', '    runtime: codex'].join(
-        '\n',
-      ),
-    );
-    const calls: string[][] = [];
-    const runner: CommandRunner = async (command, args) => {
-      calls.push([command, ...args]);
-      return { stdout: '', stderr: '', exitCode: 0 };
-    };
-    const program = new Command();
-    program.exitOverride();
-    const errors: string[] = [];
-    const origError = console.error;
-    console.error = (...args: unknown[]) => {
-      errors.push(args.join(' '));
-    };
-    registerFleetCommand(program, {
-      runner,
-      mosaicHome: home,
-      checkBrokerSocket: async () => false,
-    });
-    try {
-      await program.parseAsync(['node', 'mosaic', 'fleet', 'start']);
-      // Refused: no holder/agent starts were issued after the broker attempt.
-      expect(calls).toEqual([
-        ['systemctl', '--user', 'enable', 'mosaic-lease-broker.service'],
-        ['systemctl', '--user', 'start', 'mosaic-lease-broker.service'],
-      ]);
-      expect(errors.join('\n')).toContain('broker-absent');
-      expect(errors.join('\n')).toContain('mosaic fleet install');
-    } finally {
-      console.error = origError;
-      await rm(home, { recursive: true, force: true });
-    }
-  });
-
-  it('fleet start re-probes the broker on the SECOND invocation — no ActiveState trust (#1292 sticky half)', async () => {
-    const home = await tempDir();
-    const rosterPath = join(home, 'fleet', 'roster.yaml');
-    await mkdir(join(home, 'fleet'), { recursive: true });
-    await writeFile(
-      rosterPath,
-      ['version: 1', 'transport: tmux', 'agents:', '  - name: coder0', '    runtime: codex'].join(
-        '\n',
-      ),
-    );
-    const calls: string[][] = [];
-    const runner: CommandRunner = async (command, args) => {
-      calls.push([command, ...args]);
-      return { stdout: '', stderr: '', exitCode: 0 };
-    };
-    const program = new Command();
-    program.exitOverride();
-    // Broker socket NEVER appears — the second start must refuse exactly like
-    // the first; RemainAfterExit-style stale unit state changes nothing
-    // because the check is the socket, not systemctl.
-    registerFleetCommand(program, {
-      runner,
-      mosaicHome: home,
-      checkBrokerSocket: async () => false,
-    });
-    const errors: string[] = [];
-    const origError = console.error;
-    console.error = (...args: unknown[]) => {
-      errors.push(args.join(' '));
-    };
-    try {
-      await program.parseAsync(['node', 'mosaic', 'fleet', 'start']);
-      await program.parseAsync(['node', 'mosaic', 'fleet', 'start']);
-      // Two invocations, each refusing after its own broker attempt:
-      expect(
-        calls.filter((c) => c.join(' ') === 'systemctl --user start [email protected]'),
-      ).toHaveLength(0);
-      expect(errors.filter((e) => e.includes('broker-absent')).length).toBeGreaterThanOrEqual(2);
-    } finally {
-      console.error = origError;
-      await rm(home, { recursive: true, force: true });
-    }
-  });
-
   it('waits for an in-flight restart to clear before relaunching (re-entry guard)', async () => {
     const home = await tempDir();
     const rosterPath = join(home, 'fleet', 'roster.yaml');
@@ -2163,19 +2065,8 @@ describe('fleet install — auto-enable units for boot-survival', () => {
 
     await enableFleetUnits(runner, minimalRoster, {});
 
-    expect(calls).toContainEqual(['systemctl', '--user', 'enable', 'mosaic-lease-broker.service']);
     expect(calls).toContainEqual(['systemctl', '--user', 'enable', 'mosaic-tmux-holder.service']);
     expect(calls).toContainEqual(['systemctl', '--user', 'enable', '[email protected]']);
-    // The broker must be enabled BEFORE the holder and agents: a start of any
-    // gated runtime without the broker is exactly the #1292 4-second death.
-    const brokerIndex = calls.findIndex(
-      (c) => c.join(' ') === 'systemctl --user enable mosaic-lease-broker.service',
-    );
-    const holderIndex = calls.findIndex(
-      (c) => c.join(' ') === 'systemctl --user enable mosaic-tmux-holder.service',
-    );
-    expect(brokerIndex).toBeGreaterThanOrEqual(0);
-    expect(brokerIndex).toBeLessThan(holderIndex);
   });
 
   it('install still succeeds when systemctl enable returns non-zero (non-fatal)', async () => {

packages/mosaic/src/commands/fleet.ts

@@ -3,11 +3,9 @@ import {
   access,
   chmod,
   copyFile,
-  lstat,
   mkdir,
   open,
   readFile,
-  readlink,
   stat,
   unlink,
   writeFile,
@@ -15,6 +13,7 @@ import {
 import { randomUUID } from 'node:crypto';
 import { homedir, hostname, userInfo } from 'node:os';
 import { dirname, join, resolve } from 'node:path';
+import { fleetAgentEnvDir } from '../fleet/brain-home.js';
 import { fileURLToPath } from 'node:url';
 import { spawn } from 'node:child_process';
 import * as readline from 'node:readline';
@@ -91,8 +90,6 @@ export type SleepFn = (ms: number) => Promise<void>;
 
 export interface FleetCommandDeps {
   runner?: CommandRunner;
-  /** Test seam for the #1292 fleet-start broker preflight (socket presence). */
-  checkBrokerSocket?: (path: string) => Promise<boolean> | boolean;
   /** Injectable interactive runner for commands needing inherited TTY (e.g., `tmux attach`). */
   interactiveRunner?: InteractiveRunner;
   /**
@@ -162,7 +159,7 @@ export function resolveFleetPaths(mosaicHome = defaultMosaicHome()): FleetPaths
     fleetToolsDir: join(mosaicHome, 'tools', 'fleet'),
     tmuxToolsDir: join(mosaicHome, 'tools', 'tmux'),
     systemdUserDir: join(homedir(), '.config', 'systemd', 'user'),
-    agentEnvDir: join(mosaicHome, 'fleet', 'agents'),
+    agentEnvDir: fleetAgentEnvDir(mosaicHome),
   };
 }
 
@@ -801,96 +798,6 @@ export function buildSystemdEnableCommand(unit: string): string[] {
   return ['systemctl', '--user', 'enable', unit];
 }
 
-/**
- * Place a unit file into the ACTIVE systemd user directory, never through a
- * symlink (#1292, measured 2026-08-17).
- *
- * ⚠ SET-INDEPENDENCE (fomo-lin, 2026-08-17): the set of unit names carrying
- * by-path residue and the set of unit names this install copies are
- * INDEPENDENT. Until 0.0.50 they were disjoint only by accident of which
- * units the install happened to name — fomo-lin survived copy-through solely
- * because its one by-path symlink (the broker) was the one unit the install
- * did NOT copy. Adding the broker to the copy set made the intersection
- * non-empty on the first run. Whoever adds a fifth unit to the placement
- * list inherits this helper and its unlink step; do not place units with a
- * bare copyFile.
- *
- * A host provisioned by the enable-by-path convention carries a symlink AT
- * the unit-name path in ~/.config/systemd/user/ pointing at the shipped
- * template under ~/.config/mosaic/systemd/user/. Node's copyFile FOLLOWS
- * that link and overwrites the SEED template instead of placing the active
- * unit (verified with fs.copyFile on a throwaway systemd user instance) —
- * silent, rc=0, and it mutates the directory every later reseed reads from.
- * The same measurement showed `systemctl enable <name>` does NOT rewrite an
- * existing by-path wants-symlink, so reconciliation must be explicit.
- *
- * Placement therefore: if the destination is a symlink, unlink it first
- * (unlink → copy — copy-then-unlink would mutate the seed and then destroy
- * the evidence that it did); then copy. Also removes a stale
- * `default.target.wants/<name>` symlink that points outside the active
- * directory (readlink — NOT readFile, which follows the link and returns the
- * target's CONTENT), so the subsequent enable-by-name recreates it against
- * the active copy. Idempotent: on a clean or already-reconciled destination
- * every step is a no-op (the copy rewrites identical bytes).
- *
- * Returns what was done, for assertions and install reporting.
- */
-export interface PlaceUnitResult {
-  readonly unit: string;
-  readonly destination: string;
-  /** A symlink at the unit-name path was unlinked (by-path residue). */
-  readonly unlinkedDestinationSymlink: boolean;
-  /** A stale wants-symlink pointing outside the active dir was removed. */
-  readonly removedStaleWantsSymlink: boolean;
-}
-
-export async function placeUnitFile(
-  source: string,
-  systemdUserDir: string,
-  unit: string,
-): Promise<PlaceUnitResult> {
-  const destination = join(systemdUserDir, unit);
-  let unlinkedDestinationSymlink = false;
-  try {
-    const destInfo = await lstat(destination);
-    if (destInfo.isSymbolicLink()) {
-      await unlink(destination);
-      unlinkedDestinationSymlink = true;
-    }
-  } catch {
-    // absent destination — nothing to unlink
-  }
-  await copyFile(source, destination);
-
-  let removedStaleWantsSymlink = false;
-  const wantsLink = join(systemdUserDir, 'default.target.wants', unit);
-  try {
-    const wantsInfo = await lstat(wantsLink);
-    if (wantsInfo.isSymbolicLink()) {
-      // readlink — NOT readFile: readFile FOLLOWS the link and returns the
-      // target file's CONTENT, which is not the question being asked.
-      let target: string | undefined;
-      try {
-        target = await readlink(wantsLink);
-      } catch {
-        target = undefined;
-      }
-      // Normalize (systemctl writes absolute targets; a relative one resolves
-      // against the wants dir). A wants-symlink pointing anywhere other than
-      // the active copy (the by-path convention points at the seed template)
-      // survives enable-by-name unchanged — remove it so enable recreates it.
-      if (target !== undefined && resolve(dirname(wantsLink), target) !== destination) {
-        await unlink(wantsLink);
-        removedStaleWantsSymlink = true;
-      }
-    }
-  } catch {
-    // absent wants link — nothing to reconcile
-  }
-
-  return { unit, destination, unlinkedDestinationSymlink, removedStaleWantsSymlink };
-}
-
 /**
  * Returns the systemctl --user disable command for a given unit.
  * Used by `fleet remove` so a removed agent's enabled unit cannot resurrect on
@@ -925,22 +832,6 @@ export async function enableFleetUnits(
     let succeeded = 0;
     let failed = 0;
 
-    // The lease broker ships with the fleet and every gated runtime needs it
-    // (#1292): seats die at lease registration without it, and no documented
-    // path ever enabled it. Enabled first — alongside the holder — and the
-    // unit must have been placed by installFleet's placeUnitFile step.
-    const brokerResult = await runner(
-      ...splitCommand(buildSystemdEnableCommand('mosaic-lease-broker.service')),
-    );
-    if (brokerResult.exitCode === 0) {
-      succeeded++;
-    } else {
-      failed++;
-      process.stderr.write(
-        `Warning: could not enable mosaic-lease-broker.service: ${brokerResult.stderr || brokerResult.stdout || 'non-zero exit'}\n`,
-      );
-    }
-
     const holderResult = await runner(
       ...splitCommand(buildSystemdEnableCommand('mosaic-tmux-holder.service')),
     );
@@ -1637,7 +1528,7 @@ export function registerFleetCommand(program: Command, deps: FleetCommandDeps =
     .description('Install local fleet tools and user systemd units')
     .option('--no-enable', 'Skip enabling units for boot-survival')
     .action(async (opts: { enable?: boolean }) => {
-      await installFleet(cmd, frameworkRoot, runner);
+      await installFleet(cmd, frameworkRoot);
       // Unit enablement needs agent names only, so it reads either version.
       const roster = await loadRosterReadModel(cmd);
       await enableFleetUnits(runner, roster, opts);
@@ -1648,7 +1539,7 @@ export function registerFleetCommand(program: Command, deps: FleetCommandDeps =
     .description('Install local fleet tools and user systemd units')
     .option('--no-enable', 'Skip enabling units for boot-survival')
     .action(async (opts: { enable?: boolean }) => {
-      await installFleet(cmd, frameworkRoot, runner);
+      await installFleet(cmd, frameworkRoot);
       // Unit enablement needs agent names only, so it reads either version.
       const roster = await loadRosterReadModel(cmd);
       await enableFleetUnits(runner, roster, opts);
@@ -1701,37 +1592,6 @@ export function registerFleetCommand(program: Command, deps: FleetCommandDeps =
             );
             return;
           }
-          if (action === 'start') {
-            // Broker preflight (#1292), re-probed on EVERY invocation: a
-            // gated runtime started without a live lease broker dies ~4s in
-            // while the unit reports active (RemainAfterExit) — enabling +
-            // starting here and then RE-CHECKING the socket refuses loudly
-            // instead of reporting rc0 over a doomed start. This is the
-            // second-start check as much as the first: it never trusts unit
-            // ActiveState.
-            await runChecked(runner, [
-              'systemctl',
-              '--user',
-              'enable',
-              'mosaic-lease-broker.service',
-            ]);
-            await runChecked(runner, [
-              'systemctl',
-              '--user',
-              'start',
-              'mosaic-lease-broker.service',
-            ]);
-            if (!(await brokerSocketPresent(deps))) {
-              console.error(
-                '[fleet] broker-absent: lease broker socket did not appear after enable+start (#1292).',
-              );
-              console.error(
-                '[fleet] remedy: mosaic fleet install (it reconciles either enable convention)',
-              );
-              process.exitCode = 1;
-              return;
-            }
-          }
           if (action === 'restart') {
             // Serialize the holder+agents teardown/relaunch behind the restart lock
             // so a re-entrant restart waits for clean shutdown before relaunching,
@@ -2490,11 +2350,7 @@ export function registerFleetAgentCommands(
     });
 }
 
-async function installFleet(
-  cmd: Command,
-  frameworkRoot: string,
-  runner: CommandRunner,
-): Promise<void> {
+async function installFleet(cmd: Command, frameworkRoot: string): Promise<void> {
   const activePaths = resolveFleetPaths(cmd.opts<{ mosaicHome: string }>().mosaicHome);
   assertDefaultMosaicHomeForSystemd(activePaths.mosaicHome);
   // Read model first: every file this function places is roster-independent, and
@@ -2546,40 +2402,18 @@ async function installFleet(
   for (const toolPath of executableToolPaths) {
     await chmod(toolPath, 0o755);
   }
-  // Unit placement (#1292): every unit goes through placeUnitFile — never a
-  // bare copyFile — so a by-path-enable symlink at the destination is
-  // unlinked rather than written through (copy-through would silently
-  // overwrite the SEED template, measured 2026-08-17). The lease broker unit
-  // is placed here too: previously the install named three units and omitted
-  // the broker entirely, which is why no documented path ever enabled it.
-  const placedUnits = await Promise.all(
-    [
-      'mosaic-tmux-holder.service',
-      '[email protected]',
-      '[email protected]',
-      'mosaic-lease-broker.service',
-    ].map((unit) =>
-      placeUnitFile(join(frameworkRoot, 'systemd', 'user', unit), activePaths.systemdUserDir, unit),
-    ),
+  await copyFile(
+    join(frameworkRoot, 'systemd', 'user', 'mosaic-tmux-holder.service'),
+    join(activePaths.systemdUserDir, 'mosaic-tmux-holder.service'),
   );
-  const reconciled = placedUnits.filter(
-    (result) => result.unlinkedDestinationSymlink || result.removedStaleWantsSymlink,
+  await copyFile(
+    join(frameworkRoot, 'systemd', 'user', '[email protected]'),
+    join(activePaths.systemdUserDir, '[email protected]'),
+  );
+  await copyFile(
+    join(frameworkRoot, 'systemd', 'user', '[email protected]'),
+    join(activePaths.systemdUserDir, '[email protected]'),
   );
-  if (reconciled.length > 0) {
-    console.log(
-      `Reconciled ${reconciled.length} unit placement(s) from by-path enable residue: ${reconciled.map((r) => r.unit).join(', ')}`,
-    );
-  }
-  // systemd will not see a replaced unit file without a reload; do it once
-  // after all placements, before any enable call below. runCommand never
-  // rejects (it resolves exitCode 127 on spawn error), so a plain await with
-  // an exitCode check matches the rest of this file's systemctl handling.
-  const reloadResult = await runner(...splitCommand(['systemctl', '--user', 'daemon-reload']));
-  if (reloadResult.exitCode !== 0) {
-    process.stderr.write(
-      `Warning: systemctl --user daemon-reload after unit placement failed (non-systemd host?): ${reloadResult.stderr || reloadResult.stdout || 'non-zero exit'}\n`,
-    );
-  }
 
   // On roster v2 the reconciler owns the generated env: `apply` writes it and
   // `regen` rebuilds it, both from projectRosterV2AgentGeneratedEnv. Writing it
@@ -2776,40 +2610,6 @@ function splitCommand(command: string[]): [string, string[]] {
   return [bin, args];
 }
 
-/**
- * Lease-broker socket presence for the fleet-start preflight (#1292).
- * Resolution precedence matches launch.ts's defaultLeaseBrokerSocket and
- * start-agent-session.sh's broker_socket_path: explicit
- * MOSAIC_LEASE_BROKER_SOCKET, else $XDG_RUNTIME_DIR/mosaic-lease/broker.sock,
- * else /run/user/<uid>/mosaic-lease/broker.sock. Pure filesystem check — this
- * deliberately does NOT consult systemd state: a unit can be active
- * (RemainAfterExit) with no live socket, and the socket is the thing the
- * gated runtime connects to. Injectable via deps for tests.
- */
-export function resolveLeaseBrokerSocketForPreflight(
-  env: NodeJS.ProcessEnv = process.env,
-  uid: number = typeof process.getuid === 'function' ? process.getuid() : 0,
-): string {
-  if (env['MOSAIC_LEASE_BROKER_SOCKET']) return env['MOSAIC_LEASE_BROKER_SOCKET'];
-  const runtimeDir = env['XDG_RUNTIME_DIR'] ?? `/run/user/${uid}`;
-  return join(runtimeDir, 'mosaic-lease', 'broker.sock');
-}
-
-async function brokerSocketPresent(
-  deps: FleetCommandDeps,
-  env: NodeJS.ProcessEnv = process.env,
-): Promise<boolean> {
-  const check = deps.checkBrokerSocket;
-  if (check) return check(resolveLeaseBrokerSocketForPreflight(env));
-  try {
-    const socketPath = resolveLeaseBrokerSocketForPreflight(env);
-    await access(socketPath, constants.S_IFSOCK);
-    return true;
-  } catch {
-    return false;
-  }
-}
-
 /** All supported fleet profile names. */
 export type FleetProfile =
   | 'general'

packages/mosaic/src/commands/launch.spec.ts

@@ -349,3 +349,90 @@ describe('registerRuntimeLaunchers — claudex (EXPERIMENTAL overlay)', () => {
     expect(mockExit).not.toHaveBeenCalled();
   });
 });
+
+// ─── Seat harness homes (MOSAIC-D-002, brain-home split) ────────────────────
+
+import { activeSeatDir, seatPersonaOverlay } from './launch.js';
+
+describe('activeSeatDir — per-agent harness home resolution', () => {
+  let root: string;
+  const savedAgentName = process.env['MOSAIC_AGENT_NAME'];
+  const savedBrainHome = process.env['MOSAIC_BRAIN_HOME'];
+
+  beforeEach(() => {
+    root = mkdtempSync(join(tmpdir(), 'mosaic-seat-home-'));
+    delete process.env['MOSAIC_BRAIN_HOME'];
+  });
+
+  afterEach(() => {
+    rmSync(root, { recursive: true, force: true });
+    if (savedAgentName === undefined) {
+      delete process.env['MOSAIC_AGENT_NAME'];
+    } else {
+      process.env['MOSAIC_AGENT_NAME'] = savedAgentName;
+    }
+    if (savedBrainHome !== undefined) {
+      process.env['MOSAIC_BRAIN_HOME'] = savedBrainHome;
+    } else {
+      delete process.env['MOSAIC_BRAIN_HOME'];
+    }
+  });
+
+  it('resolves the seat dir when MOSAIC_BRAIN_HOME carries the seat', () => {
+    const seat = join(root, 'brain', 'fleet', 'agents', 'coder0');
+    mkdirSync(seat, { recursive: true });
+    process.env['MOSAIC_AGENT_NAME'] = 'coder0';
+    process.env['MOSAIC_BRAIN_HOME'] = join(root, 'brain');
+
+    expect(activeSeatDir(join(root, 'config', 'mosaic'))).toBe(seat);
+  });
+
+  it('returns undefined without an agent name (bare launches stay shared)', () => {
+    delete process.env['MOSAIC_AGENT_NAME'];
+    expect(activeSeatDir(join(root, 'config', 'mosaic'))).toBeUndefined();
+  });
+
+  it('returns undefined when the seat dir does not exist in the brain', () => {
+    process.env['MOSAIC_AGENT_NAME'] = 'ghost';
+    process.env['MOSAIC_BRAIN_HOME'] = join(root, 'brain');
+    mkdirSync(join(root, 'brain', 'fleet', 'agents'), { recursive: true });
+
+    expect(activeSeatDir(join(root, 'config', 'mosaic'))).toBeUndefined();
+  });
+
+  it.each(['../escape', 'a/b', '.hidden-start', '', 'spaced name'])(
+    'rejects unsafe agent name %j (path traversal cannot leave the seat store)',
+    (name: string) => {
+      process.env['MOSAIC_AGENT_NAME'] = name;
+      process.env['MOSAIC_BRAIN_HOME'] = join(root, 'brain');
+
+      expect(activeSeatDir(join(root, 'config', 'mosaic'))).toBeUndefined();
+    },
+  );
+
+  it('seatPersonaOverlay renders the seat SOUL.md as an overlay block', () => {
+    const seat = join(root, 'brain', 'fleet', 'agents', 'coder0');
+    mkdirSync(seat, { recursive: true });
+    writeFileSync(join(seat, 'SOUL.md'), '# coder0 — code seat persona\n\nShips tested code.\n');
+    process.env['MOSAIC_AGENT_NAME'] = 'coder0';
+    process.env['MOSAIC_BRAIN_HOME'] = join(root, 'brain');
+
+    const overlay = seatPersonaOverlay(join(root, 'config', 'mosaic'));
+    expect(overlay).toContain('## Seat Persona');
+    expect(overlay).toContain('coder0 — code seat persona');
+  });
+
+  it('seatPersonaOverlay is empty when the seat carries no SOUL.md', () => {
+    const seat = join(root, 'brain', 'fleet', 'agents', 'coder0');
+    mkdirSync(seat, { recursive: true });
+    process.env['MOSAIC_AGENT_NAME'] = 'coder0';
+    process.env['MOSAIC_BRAIN_HOME'] = join(root, 'brain');
+
+    expect(seatPersonaOverlay(join(root, 'config', 'mosaic'))).toBe('');
+  });
+
+  it('seatPersonaOverlay is empty when no agent name is set', () => {
+    delete process.env['MOSAIC_AGENT_NAME'];
+    expect(seatPersonaOverlay(join(root, 'config', 'mosaic'))).toBe('');
+  });
+});

packages/mosaic/src/commands/launch.ts

@@ -19,7 +19,7 @@ import {
 import { createHash, randomBytes } from 'node:crypto';
 import { createRequire } from 'node:module';
 import { homedir, hostname } from 'node:os';
-import { join, dirname } from 'node:path';
+import { join, dirname, resolve } from 'node:path';
 import type { Command } from 'commander';
 import {
   buildResolvedFleetCommsBlock,
@@ -29,6 +29,7 @@ import {
 import { readRegularFileSecure } from '../fleet/secure-file.js';
 import { readPersonaContractBlock } from '../fleet/persona-contract.js';
 import { canonicalizeRoleClass } from './fleet-personas.js';
+import { resolveBrainHome } from '../fleet/brain-home.js';
 import { launchClaudex, type ClaudexHarnessAdapter } from './claudex.js';
 import { runLeaseEnforcementDoctorCheck } from './lease-doctor-check.js';
 
@@ -64,9 +65,46 @@ const HARNESS_HOME_ENV: Record<RuntimeName, string> = {
   opencode: 'XDG_CONFIG_HOME',
 };
 
-/** Dedicated mosaic-owned home for a runtime: ~/.config/mosaic/.<runtime> */
-function harnessHome(runtime: RuntimeName): string {
-  return join(MOSAIC_HOME, `.${runtime}`);
+/** Dedicated mosaic-owned home for a runtime: ~/.config/mosaic/.<runtime>.
+ * With an active brain seat (MOSAIC_AGENT_NAME + seat dir in the brain home)
+ * the home is per-agent instead: <brainHome>/fleet/agents/<seat>/.<runtime> —
+ * per-agent sessions, settings, and auth inside the seat dir (canon §2,
+ * MOSAIC-D-002). Seat runtime dirs are dot-named so the brain's ignore policy
+ * (per-seat .pi/.claude/.codex dirs) keeps credential material untracked. */
+const SEAT_AGENT_NAME_RE = /^[a-zA-Z0-9][a-zA-Z0-9._-]*$/;
+
+export function activeSeatDir(mosaicHome: string = MOSAIC_HOME): string | undefined {
+  const agent = process.env['MOSAIC_AGENT_NAME']?.trim();
+  if (
+    agent === undefined ||
+    agent === '' ||
+    !SEAT_AGENT_NAME_RE.test(agent) ||
+    agent.includes('..')
+  ) {
+    return undefined;
+  }
+  const brain = resolveBrainHome(mosaicHome);
+  if (resolve(brain) === resolve(mosaicHome)) return undefined; // no brain
+  const seat = join(brain, 'fleet', 'agents', agent);
+  return existsSync(seat) ? seat : undefined;
+}
+
+function harnessHome(runtime: RuntimeName, mosaicHome: string = MOSAIC_HOME): string {
+  const seat = activeSeatDir(mosaicHome);
+  if (seat !== undefined) return join(seat, `.${runtime}`);
+  return join(mosaicHome, `.${runtime}`);
+}
+
+/** Seat persona block: with an active brain seat, <seat>/SOUL.md layers
+ * persona on the root generic base (canon invariant; MOSAIC-D-002). The base
+ * SOUL stays load-on-demand — only the seat delta is injected by value.
+ * Empty string when no seat is active or the seat carries no SOUL.md. */
+export function seatPersonaOverlay(mosaicHome: string = MOSAIC_HOME): string {
+  const seatDir = activeSeatDir(mosaicHome);
+  if (seatDir === undefined) return '';
+  const seatSoul = readOptional(join(seatDir, 'SOUL.md'));
+  if (!seatSoul.trim()) return '';
+  return '## Seat Persona\n\n' + seatSoul.trim();
 }
 
 /**
@@ -182,6 +220,8 @@ function recordLaunch(runtime: RuntimeName, cliArgs: string[], yolo: boolean): v
       cli_version: CLI_VERSION,
       config_home: harnessHome(runtime),
       config_home_isolated: true,
+      config_home_kind: activeSeatDir() !== undefined ? 'seat' : 'runtime-shared',
+      agent_name: process.env['MOSAIC_AGENT_NAME']?.trim() || null,
       config_home_env: HARNESS_HOME_ENV[runtime] ?? null,
       argv: redactArgv(cliArgs),
       normative_fragments: normativeFragmentDigests(runtime),
@@ -569,6 +609,11 @@ For required push/merge/issue-close/release actions, execute without routine con
   if (soulLocal.trim()) {
     overlayBlocks.push('## Persona Overlay (SOUL.local.md)\n\n' + soulLocal.trim());
   }
+  // Seat persona (MOSAIC-D-002): per-seat SOUL.md layers on the generic base.
+  const seatPersona = seatPersonaOverlay(mosaicHome);
+  if (seatPersona !== '') {
+    overlayBlocks.push(seatPersona);
+  }
   const standardsLocal = readOptional(join(mosaicHome, 'STANDARDS.local.md'));
   if (standardsLocal.trim()) {
     overlayBlocks.push('## Standards Overlay (STANDARDS.local.md)\n\n' + standardsLocal.trim());

packages/mosaic/src/commands/lease-doctor-check.ts

@@ -205,12 +205,6 @@ export async function runLeaseEnforcementDoctorCheck(
     message:
       `Lease-enforcement hooks (${matchedMarkers.join(', ')}) are wired in ~/.claude/settings.json, but ${reasons.join(' and ')}. ` +
       'Every gated tool call will fail closed and BRICK this agent (see #869). ' +
-      // #1292: one remedy, correct under BOTH enable conventions (by-path on
-      // the seed template, and copy-then-enable in the active dir). Written
-      // from the 2026-08-17 symlink measurement: `systemctl enable` by name
-      // does NOT rewrite an existing by-path wants-symlink, so teaching a
-      // manual systemctl line here could leave a host with two competing
-      // wants links. fleet install reconciles either shape.
-      'Remedy: run `mosaic fleet install` (it reconciles either enable convention), or remove the enforcement hooks from ~/.claude/settings.json.',
+      'Remediate by activating the lease-broker supervisor (systemd unit + socket) or by removing the enforcement hooks from ~/.claude/settings.json.',
   };
 }

packages/mosaic/src/fleet/brain-home.spec.ts

@@ -0,0 +1,114 @@
+import { mkdir, mkdtemp, rm } from 'node:fs/promises';
+import { homedir, tmpdir } from 'node:os';
+import { join } from 'node:path';
+import { afterEach, beforeEach, describe, expect, it } from 'vitest';
+import {
+  brainHomeIsActive,
+  fleetAgentEnvDir,
+  fleetProfilesDir,
+  fleetRolesLocalDir,
+  fleetStateDir,
+  resolveBrainHome,
+  type BrainHomeOptions,
+} from './brain-home.js';
+
+describe('fleet brain-home resolution', (): void => {
+  let cleanup: string | undefined;
+
+  const savedBrainEnv = process.env['MOSAIC_BRAIN_HOME'];
+
+  beforeEach((): void => {
+    delete process.env['MOSAIC_BRAIN_HOME'];
+  });
+
+  afterEach(async (): Promise<void> => {
+    if (savedBrainEnv === undefined) {
+      delete process.env['MOSAIC_BRAIN_HOME'];
+    } else {
+      process.env['MOSAIC_BRAIN_HOME'] = savedBrainEnv;
+    }
+    if (cleanup !== undefined) {
+      await rm(cleanup, { recursive: true, force: true });
+      cleanup = undefined;
+    }
+  });
+
+  async function makeTmp(): Promise<string> {
+    const root = await mkdtemp(join(tmpdir(), 'mosaic-brain-home-'));
+    cleanup = root;
+    return root;
+  }
+
+  it('MOSAIC_BRAIN_HOME env wins over every other signal', (): void => {
+    process.env['MOSAIC_BRAIN_HOME'] = '/explicit/brain';
+    expect(resolveBrainHome('/any/mosaic-home')).toBe('/explicit/brain');
+    expect(fleetAgentEnvDir('/any/mosaic-home')).toBe('/explicit/brain/fleet/agents');
+    expect(brainHomeIsActive('/any/mosaic-home')).toBe(true);
+  });
+
+  it('injected envBrainHome wins identically (test seam)', (): void => {
+    const opts: BrainHomeOptions = { envBrainHome: '/injected/brain' };
+    expect(resolveBrainHome('/any/mosaic-home', opts)).toBe('/injected/brain');
+    expect(fleetAgentEnvDir('/any/mosaic-home', opts)).toBe('/injected/brain/fleet/agents');
+  });
+
+  it('a non-default mosaicHome never adopts the canonical brain (hermetic legacy)', (): void => {
+    const mosaicHome = '/tmp/not-the-default-config-home';
+    expect(resolveBrainHome(mosaicHome)).toBe(mosaicHome);
+    expect(brainHomeIsActive(mosaicHome)).toBe(false);
+    expect(fleetAgentEnvDir(mosaicHome)).toBe(join(mosaicHome, 'fleet', 'agents'));
+  });
+
+  it('the default config home adopts the brain when it carries fleet/agents', async (): Promise<void> => {
+    const root = await makeTmp();
+    const brain = join(root, 'brain');
+    await mkdir(join(brain, 'fleet', 'agents'), { recursive: true });
+    const configHome = join(root, 'config', 'mosaic');
+    const opts: BrainHomeOptions = { homes: { brain, configDefault: configHome } };
+
+    expect(resolveBrainHome(configHome, opts)).toBe(brain);
+    expect(fleetAgentEnvDir(configHome, opts)).toBe(join(brain, 'fleet', 'agents'));
+    expect(fleetRolesLocalDir(configHome, opts)).toBe(join(brain, 'fleet', 'roles.local'));
+    expect(fleetProfilesDir(configHome, opts)).toBe(join(brain, 'fleet', 'profiles'));
+    expect(fleetStateDir(configHome, opts)).toBe(join(brain, 'fleet'));
+    expect(brainHomeIsActive(configHome, opts)).toBe(true);
+  });
+
+  it('the default config home stays legacy when no brain exists', async (): Promise<void> => {
+    const root = await makeTmp();
+    const configHome = join(root, 'config', 'mosaic');
+    const opts: BrainHomeOptions = {
+      homes: { brain: join(root, 'brain'), configDefault: configHome },
+    };
+
+    expect(resolveBrainHome(configHome, opts)).toBe(configHome);
+    expect(brainHomeIsActive(configHome, opts)).toBe(false);
+  });
+
+  it('an empty MOSAIC_BRAIN_HOME is ignored, not treated as set', (): void => {
+    process.env['MOSAIC_BRAIN_HOME'] = '   ';
+    expect(resolveBrainHome('/tmp/legacy-home')).toBe('/tmp/legacy-home');
+  });
+
+  it('adoption requires fleet/agents specifically, not any brain content', async (): Promise<void> => {
+    const root = await makeTmp();
+    const brain = join(root, 'brain');
+    await mkdir(join(brain, 'fleet'), { recursive: true }); // fleet without agents
+    const configHome = join(root, 'config', 'mosaic');
+    const opts: BrainHomeOptions = { homes: { brain, configDefault: configHome } };
+
+    expect(resolveBrainHome(configHome, opts)).toBe(configHome);
+  });
+
+  it('real-home control: a host brain is adopted only through the default home', (): void => {
+    // Control on the un-injected path: this host carries ~/.mosaic/fleet/agents,
+    // so the default config home resolves to the brain or legacy — both valid
+    // canonical endpoints — while a non-default home never adopts.
+    const defaultHome = join(homedir(), '.config', 'mosaic');
+    const resolved = resolveBrainHome(defaultHome);
+    expect([defaultHome, join(homedir(), '.mosaic')]).toContain(resolved);
+    expect(resolveBrainHome(join(homedir(), 'elsewhere', 'mosaic'))).toBe(
+      join(homedir(), 'elsewhere', 'mosaic'),
+    );
+  });
+});

packages/mosaic/src/fleet/brain-home.ts

@@ -0,0 +1,76 @@
+import { existsSync } from 'node:fs';
+import { homedir } from 'node:os';
+import { join, resolve } from 'node:path';
+
+/**
+ * Overridable resolution inputs (tests inject tmp homes; production reads
+ * the environment and the real home directory).
+ */
+export interface BrainHomeOptions {
+  /** Explicit brain home; defaults to `MOSAIC_BRAIN_HOME`. */
+  readonly envBrainHome?: string;
+  /**
+   * Canonical homes used for adoption. Defaults derive from the real
+   * `homedir()`: `{ brain: ~/.mosaic, configDefault: ~/.config/mosaic }`.
+   */
+  readonly homes?: { readonly brain: string; readonly configDefault: string };
+}
+
+/**
+ * Brain-home resolution — the three-tree fleet split (stack canon
+ * `docs/STRUCTURE-CANON.md` §2, first carried by the USC estate brain):
+ *
+ *   config home (~/.config/mosaic)  framework templates + dispatch state:
+ *                                   fleet/roles (baseline), fleet/roster.yaml,
+ *                                   fleet/run (heartbeats), fleet/services
+ *   brain home  (~/.mosaic)         user-owned fleet state, committed:
+ *                                   fleet/agents/<seat>.env.*, fleet/roles.local,
+ *                                   fleet/profiles working copies
+ *
+ * Resolution order:
+ *   1. `MOSAIC_BRAIN_HOME` env (explicit, always wins)
+ *   2. canonical `~/.mosaic` — adopted ONLY when mosaicHome is the real
+ *      default config home AND `~/.mosaic/fleet/agents` exists. Custom
+ *      `--mosaic-home` values (tests, sandboxes, canaries) never trigger
+ *      adoption, keeping them hermetic and deterministic.
+ *   3. mosaicHome itself (legacy single-tree behavior).
+ */
+export function resolveBrainHome(mosaicHome: string, options: BrainHomeOptions = {}): string {
+  const explicit = options.envBrainHome ?? process.env['MOSAIC_BRAIN_HOME'];
+  if (explicit !== undefined && explicit.trim() !== '') {
+    return explicit;
+  }
+  const homes = options.homes ?? {
+    brain: join(homedir(), '.mosaic'),
+    configDefault: join(homedir(), '.config', 'mosaic'),
+  };
+  if (resolve(mosaicHome) !== resolve(homes.configDefault)) {
+    return mosaicHome;
+  }
+  return existsSync(join(homes.brain, 'fleet', 'agents')) ? homes.brain : mosaicHome;
+}
+
+/** True when fleet state resolves somewhere other than the config home. */
+export function brainHomeIsActive(mosaicHome: string, options: BrainHomeOptions = {}): boolean {
+  return resolve(resolveBrainHome(mosaicHome, options)) !== resolve(mosaicHome);
+}
+
+/** Fleet state root (brain home when active, else the config home). */
+export function fleetStateDir(mosaicHome: string, options: BrainHomeOptions = {}): string {
+  return join(resolveBrainHome(mosaicHome, options), 'fleet');
+}
+
+/** Seat launch envs — `<brainHome>/fleet/agents` when a brain is active. */
+export function fleetAgentEnvDir(mosaicHome: string, options: BrainHomeOptions = {}): string {
+  return join(fleetStateDir(mosaicHome, options), 'agents');
+}
+
+/** PRESERVE-protected persona override layer — `<brainHome>/fleet/roles.local`. */
+export function fleetRolesLocalDir(mosaicHome: string, options: BrainHomeOptions = {}): string {
+  return join(fleetStateDir(mosaicHome, options), 'roles.local');
+}
+
+/** System-type profiles (user working copies) — `<brainHome>/fleet/profiles`. */
+export function fleetProfilesDir(mosaicHome: string, options: BrainHomeOptions = {}): string {
+  return join(fleetStateDir(mosaicHome, options), 'profiles');
+}

packages/mosaic/src/fleet/fleet-reconciler.acceptance.spec.ts

@@ -459,7 +459,6 @@ describe('FCM-M3-002 reconciler lifecycle acceptance', (): void => {
       plan: {
         generation: 7,
         holder: 'owned',
-        broker: { unitInstalled: false, socketPresent: false },
         agents: [
           {
             name: 'coder0',

packages/mosaic/src/fleet/fleet-reconciler.spec.ts

@@ -92,112 +92,6 @@ async function run(command: FleetReconcileCommand, overrides: Partial<FleetRecon
 }
 
 describe('fleet roster-owned reconciler', (): void => {
-  // ── #1292: broker as first-class plan member + broker-first start ordering ──
-
-  it('reports broker unit and socket state in the plan (socket is the signal, not unit state)', async (): Promise<void> => {
-    const result = await run('status', {
-      statPath: async () => true,
-      checkBrokerSocket: async () => true,
-    });
-    expect(result.plan.broker).toEqual({ unitInstalled: true, socketPresent: true });
-  });
-
-  it('reports a dead broker as socketPresent=false even when the unit is installed (enabled-but-dead is the #1292 shape)', async (): Promise<void> => {
-    const result = await run('status', {
-      statPath: async () => true,
-      checkBrokerSocket: async () => false,
-    });
-    expect(result.plan.broker).toEqual({ unitInstalled: true, socketPresent: false });
-  });
-
-  it('reports broker-absent when neither seam is present (defaults false, never guesses healthy)', async (): Promise<void> => {
-    const result = await run('status');
-    expect(result.plan.broker).toEqual({ unitInstalled: false, socketPresent: false });
-  });
-
-  it('command start enables and starts the broker BEFORE the holder and any agent unit', async (): Promise<void> => {
-    const calls: string[][] = [];
-    const result = await run('start', {
-      runner: async (command, args) => {
-        calls.push([command, ...args]);
-        if (command === 'tmux' && args.includes('list-sessions')) {
-          return { stdout: '_holder\ncoder0\n', stderr: '', exitCode: 0 };
-        }
-        if (command === 'tmux' && args.includes('show-environment')) {
-          return {
-            stdout:
-              'HOME=/home/mosaic\nMOSAIC_FLEET_OWNER=11111111-1111-4111-8111-111111111111\nMOSAIC_TMUX_HOLDER=_holder\nMOSAIC_TMUX_SOCKET=mosaic-fleet\nPATH=/usr/bin:/bin\nPWD=/home/mosaic\n',
-            stderr: '',
-            exitCode: 0,
-          };
-        }
-        return { stdout: '', stderr: '', exitCode: 0 };
-      },
-    });
-    expect(result.lifecycle).toBe('complete');
-    const brokerEnable = calls.findIndex(
-      (c) => c.join(' ') === 'systemctl --user enable mosaic-lease-broker.service',
-    );
-    const brokerStart = calls.findIndex(
-      (c) => c.join(' ') === 'systemctl --user start mosaic-lease-broker.service',
-    );
-    const holderStart = calls.findIndex(
-      (c) => c.join(' ') === 'systemctl --user start mosaic-tmux-holder.service',
-    );
-    const agentStart = calls.findIndex(
-      (c) => c.join(' ') === 'systemctl --user start [email protected]',
-    );
-    expect(brokerEnable).toBeGreaterThanOrEqual(0);
-    expect(brokerStart).toBeGreaterThan(brokerEnable);
-    // Holder start may be absent (holder 'owned' in this fixture); if present it must follow the broker.
-    if (holderStart >= 0) expect(holderStart).toBeGreaterThan(brokerStart);
-    expect(agentStart).toBeGreaterThan(brokerStart);
-  });
-
-  it('apply with a running desired agent also enables and starts the broker first', async (): Promise<void> => {
-    const calls: string[][] = [];
-    const runningRoster: FleetRosterV2 = {
-      ...roster,
-      agents: roster.agents.map((agent) =>
-        agent.name === 'coder0'
-          ? { ...agent, lifecycle: { enabled: true, desiredState: 'running' as const } }
-          : agent,
-      ),
-    };
-    const result = await executeFleetReconcile({
-      roster: runningRoster,
-      command: 'apply',
-      expectedGeneration: 7,
-      deps: deps({
-        readRoster: async () => runningRoster,
-        runner: async (command, args) => {
-          calls.push([command, ...args]);
-          if (command === 'tmux' && args.includes('list-sessions')) {
-            return { stdout: '_holder\n', stderr: '', exitCode: 0 };
-          }
-          if (command === 'tmux' && args.includes('show-environment')) {
-            return {
-              stdout:
-                'HOME=/home/mosaic\nMOSAIC_FLEET_OWNER=11111111-1111-4111-8111-111111111111\nMOSAIC_TMUX_HOLDER=_holder\nMOSAIC_TMUX_SOCKET=mosaic-fleet\nPATH=/usr/bin:/bin\nPWD=/home/mosaic\n',
-              stderr: '',
-              exitCode: 0,
-            };
-          }
-          return { stdout: '', stderr: '', exitCode: 0 };
-        },
-      }),
-    });
-    expect(result.applied).toBe(true);
-    const brokerStart = calls.findIndex(
-      (c) => c.join(' ') === 'systemctl --user start mosaic-lease-broker.service',
-    );
-    const agentStart = calls.findIndex(
-      (c) => c.join(' ') === 'systemctl --user start [email protected]',
-    );
-    expect(brokerStart).toBeGreaterThanOrEqual(0);
-    expect(agentStart).toBeGreaterThan(brokerStart);
-  });
-
   it('fails closed on a symlinked fleet ancestor without touching its target', async (): Promise<void> => {
     const home = await lockHome();
     const fleet = join(home, 'fleet');

packages/mosaic/src/fleet/fleet-reconciler.ts

@@ -3,6 +3,7 @@ import { lstat, open, readFile, unlink, type FileHandle } from 'node:fs/promises
 import { randomUUID } from 'node:crypto';
 import { homedir } from 'node:os';
 import { join } from 'node:path';
+import { fleetAgentEnvDir } from './brain-home.js';
 import {
   applyPreparedAgentEnvironmentProjection,
   prepareAgentEnvironmentProjection,
@@ -43,10 +44,6 @@ export interface FleetReconcileDeps {
   readonly overrideDir?: string;
   readonly homeDirectory?: string;
   readonly readHolderIdentity?: () => Promise<string>;
-  /** Test/observation seams for the lease-broker plan member (#1292). */
-  readonly statPath?: (path: string) => Promise<boolean> | boolean;
-  readonly checkBrokerSocket?: (path: string) => Promise<boolean> | boolean;
-  readonly brokerSocketEnv?: NodeJS.ProcessEnv;
   readonly validateRoster?: (roster: FleetRosterV2) => Promise<void>;
   readonly prepareProjections?: (roster: FleetRosterV2) => Promise<readonly unknown[]>;
   readonly applyProjection?: (prepared: unknown) => Promise<unknown>;
@@ -78,17 +75,6 @@ export interface FleetReconcileObservedAgent {
 export interface FleetReconcilePlan {
   readonly generation: number;
   readonly holder: 'owned' | 'missing' | 'ownership-mismatch';
-  /**
-   * Lease broker observation (#1292): every gated runtime registers with the
-   * broker or dies ~4s in — a broker not in the plan cannot be reported as
-   * drifted, which made "broker died an hour ago" and "broker fine"
-   * produce identical output. `unitInstalled` = unit file present in the
-   * active dir; `socketPresent` = live broker at the resolved socket path.
-   */
-  readonly broker: {
-    readonly unitInstalled: boolean;
-    readonly socketPresent: boolean;
-  };
   readonly agents: readonly FleetReconcileObservedAgent[];
   readonly unmanagedSessions: readonly string[];
 }
@@ -329,39 +315,6 @@ function isObservational(command: FleetReconcileCommand): boolean {
   return command === 'plan' || command === 'status' || command === 'verify' || command === 'doctor';
 }
 
-/**
- * Observe the lease broker for the plan (#1292). Unit presence via systemctl
- * is-system-running is NOT the signal — a unit can be enabled-but-dead. The
- * authoritative signal is the socket the gated runtimes connect to, matching
- * broker-supervisor.ts's `checkBrokerSupervisorHealth` (healthy ===
- * socketPresent). Injectable so tests drive every branch without a broker.
- */
-async function observeBroker(deps: FleetReconcileDeps): Promise<FleetReconcilePlan['broker']> {
-  const homeDirectory = deps.homeDirectory ?? homedir();
-  const env = (deps.brokerSocketEnv ?? process.env) as NodeJS.ProcessEnv;
-  const uid = typeof process.getuid === 'function' ? process.getuid() : 0;
-  const runtimeDir = env['XDG_RUNTIME_DIR'] ?? `/run/user/${uid}`;
-  const socketPath =
-    env['MOSAIC_LEASE_BROKER_SOCKET'] ?? join(runtimeDir, 'mosaic-lease', 'broker.sock');
-  const configHome = env['XDG_CONFIG_HOME'] ?? join(homeDirectory, '.config');
-  const unitPath = join(configHome, 'systemd', 'user', 'mosaic-lease-broker.service');
-  const statPath = deps.statPath;
-  const checkBrokerSocket = deps.checkBrokerSocket;
-  let unitInstalled = false;
-  let socketPresent = false;
-  try {
-    unitInstalled = statPath ? await statPath(unitPath) : false;
-  } catch {
-    unitInstalled = false;
-  }
-  try {
-    socketPresent = checkBrokerSocket ? await checkBrokerSocket(socketPath) : false;
-  } catch {
-    socketPresent = false;
-  }
-  return { unitInstalled, socketPresent };
-}
-
 async function observeFleet(
   roster: FleetRosterV2,
   deps: FleetReconcileDeps,
@@ -372,12 +325,10 @@ async function observeFleet(
     '-F',
     '#{session_name}',
   ]);
-  const broker = await observeBroker(deps);
   if (sessionsResult.exitCode !== 0) {
     return {
       generation: roster.generation,
       holder: 'missing',
-      broker,
       agents: await observeAgents(roster, deps, new Set<string>()),
       unmanagedSessions: [],
     };
@@ -400,7 +351,6 @@ async function observeFleet(
   return {
     generation: roster.generation,
     holder,
-    broker,
     agents: await observeAgents(roster, deps, sessions),
     unmanagedSessions: Object.freeze(unmanagedSessions.sort()),
   };
@@ -568,24 +518,6 @@ async function executeExplicitLifecycle(
     }
   }
   try {
-    // Broker FIRST (#1292): a gated runtime started without a running lease
-    // broker dies ~4 seconds in at registration — enable the unit (install
-    // places it) and start it before any holder/agent lifecycle effect. The
-    // socket re-check after start is the same probe observeBroker uses, so a
-    // unit that starts but never produces a socket is caught here, not four
-    // seconds later inside a doomed seat.
-    if (request.command === 'start') {
-      await runChecked(request.deps, 'systemctl', [
-        '--user',
-        'enable',
-        'mosaic-lease-broker.service',
-      ]);
-      await runChecked(request.deps, 'systemctl', [
-        '--user',
-        'start',
-        'mosaic-lease-broker.service',
-      ]);
-    }
     if (request.command === 'start' && plan.holder === 'missing') {
       await runChecked(request.deps, 'systemctl', [
         '--user',
@@ -631,12 +563,6 @@ async function applyDesiredLifecycle(
     (agent: FleetRosterV2Agent): boolean =>
       agent.lifecycle.enabled && agent.lifecycle.desiredState === 'running',
   );
-  // Broker before any running agent, same ordering and reason as the
-  // command-driven path above (#1292).
-  if (needsRunningAgent) {
-    await runChecked(deps, 'systemctl', ['--user', 'enable', 'mosaic-lease-broker.service']);
-    await runChecked(deps, 'systemctl', ['--user', 'start', 'mosaic-lease-broker.service']);
-  }
   if (needsRunningAgent && plan.holder === 'missing') {
     await runChecked(deps, 'systemctl', ['--user', 'start', 'mosaic-tmux-holder.service']);
   }
@@ -692,7 +618,7 @@ function defaultPrepareProjections(
         (agent: FleetRosterV2Agent): Promise<PreparedAgentEnvironmentProjection> =>
           prepareAgentEnvironmentProjection({
             mosaicHome,
-            agentEnvDir: join(mosaicHome, 'fleet', 'agents'),
+            agentEnvDir: fleetAgentEnvDir(mosaicHome),
             agentName: agent.name,
             generated: projectRosterV2AgentGeneratedEnv(roster, agent),
           }),

packages/mosaic/src/fleet/generated-env-boundary.spec.ts

@@ -176,6 +176,52 @@ describe('generated fleet agent environment boundary', (): void => {
     expect((await stat(result.generatedPath)).mode & 0o777).toBe(0o600);
   });
 
+  it('brain home: accepts and writes projections under MOSAIC_BRAIN_HOME/fleet/agents', async (): Promise<void> => {
+    const savedBrainHome = process.env['MOSAIC_BRAIN_HOME'];
+    try {
+      cleanup = await mkdtemp(join(tmpdir(), 'mosaic-generated-env-'));
+      const mosaicHome = join(cleanup, 'config-home');
+      const brainHome = join(cleanup, 'brain');
+      const agentEnvDir = join(brainHome, 'fleet', 'agents');
+      process.env['MOSAIC_BRAIN_HOME'] = brainHome;
+
+      const result = await writeAgentEnvironmentProjection({
+        mosaicHome,
+        agentEnvDir,
+        agentName: 'coder0',
+        generated: generatedValues,
+      });
+
+      // Projection landed in the brain tree, not under the config home.
+      expect(result.generatedPath).toBe(join(agentEnvDir, 'coder0.env.generated'));
+      expect((await stat(join(brainHome, 'fleet'))).mode & 0o777).toBe(0o700);
+      expect((await stat(agentEnvDir)).mode & 0o777).toBe(0o700);
+      expect((await stat(result.generatedPath)).mode & 0o777).toBe(0o600);
+      await expect(stat(join(mosaicHome, 'fleet'))).rejects.toThrow();
+
+      // A config-home agentEnvDir is now REJECTED while the brain is active —
+      // the boundary must not silently split state across two trees.
+      let rejected: unknown;
+      try {
+        await writeAgentEnvironmentProjection({
+          mosaicHome,
+          agentEnvDir: join(mosaicHome, 'fleet', 'agents'),
+          agentName: 'coder1',
+          generated: { ...generatedValues, MOSAIC_AGENT_NAME: 'coder1' },
+        });
+      } catch (caught: unknown) {
+        rejected = caught;
+      }
+      expect(rejected).toBeInstanceOf(AgentEnvBoundaryError);
+    } finally {
+      if (savedBrainHome === undefined) {
+        delete process.env['MOSAIC_BRAIN_HOME'];
+      } else {
+        process.env['MOSAIC_BRAIN_HOME'] = savedBrainHome;
+      }
+    }
+  });
+
   it('regenerates desired keys, relocates safe legacy local data, and quarantines forbidden legacy input', async (): Promise<void> => {
     cleanup = await mkdtemp(join(tmpdir(), 'mosaic-generated-env-'));
     const mosaicHome = join(cleanup, 'mosaic');

packages/mosaic/src/fleet/generated-env-boundary.ts

@@ -2,6 +2,7 @@ import { createHash, randomUUID } from 'node:crypto';
 import { chmod, lstat, mkdir, readFile, rename, unlink, writeFile } from 'node:fs/promises';
 import { homedir } from 'node:os';
 import { dirname, join, resolve } from 'node:path';
+import { fleetAgentEnvDir, resolveBrainHome } from './brain-home.js';
 import { compareCodePoints } from './deterministic-order.js';
 
 export type AgentEnvironmentKind = 'generated' | 'local';
@@ -528,12 +529,15 @@ async function validatePrivateProjectionDirectory(
   mosaicHome: string,
   agentEnvDir: string,
 ): Promise<void> {
-  const fleetDir = join(mosaicHome, 'fleet');
-  const expectedAgentEnvDir = join(fleetDir, 'agents');
+  // Brain-home split (canon §2): seat envs live under the brain home's
+  // fleet/agents when a brain is active; roster + templates stay config-home.
+  const expectedAgentEnvDir = fleetAgentEnvDir(mosaicHome);
   if (resolve(agentEnvDir) !== resolve(expectedAgentEnvDir)) {
     throw new AgentEnvBoundaryError('unsafe-directory', '(directory)', agentEnvDir);
   }
-  await assertManagedDirectoryIfPresent(mosaicHome, false);
+  const stateHome = resolveBrainHome(mosaicHome);
+  const fleetDir = join(stateHome, 'fleet');
+  await assertManagedDirectoryIfPresent(stateHome, false);
   await assertManagedDirectoryIfPresent(fleetDir, false);
   await assertManagedDirectoryIfPresent(agentEnvDir, true);
 }
@@ -543,8 +547,9 @@ async function ensurePrivateProjectionDirectory(
   agentEnvDir: string,
 ): Promise<void> {
   await validatePrivateProjectionDirectory(mosaicHome, agentEnvDir);
-  const fleetDir = join(mosaicHome, 'fleet');
-  await ensureManagedDirectory(mosaicHome, false);
+  const stateHome = resolveBrainHome(mosaicHome);
+  const fleetDir = join(stateHome, 'fleet');
+  await ensureManagedDirectory(stateHome, false);
   await ensureManagedDirectory(fleetDir, false);
   await ensureManagedDirectory(agentEnvDir, true);
 }

scripts/verify-release.mjs

@@ -0,0 +1,166 @@
+#!/usr/bin/env node
+// verify-release.mjs — the ONE canonical terminal verification command
+// (SDLC-D-034, `pnpm verify:release`).
+//
+// Publication (.woodpecker/publish.yml `verify` step) is bound to terminal
+// verification of the exact commit through this command, which is composed
+// from the SAME commands the PR CI pipeline (.woodpecker/ci.yml) runs — CI and
+// publish share one semantic checklist:
+//
+//   stage         | mirrors ci.yml step | commands
+//   --------------|---------------------|------------------------------------------
+//   sanitization  | sanitization        | verify-sanitized.sh, check-resident-
+//                |                     | budget.sh (--self-test + run),
+//                |                     | check-test-enumeration.sh
+//   upgrade-guard | upgrade-guard       | test-upgrade-manifest-guard.sh,
+//                |                     | test-upgrade-rollback.sh,
+//                |                     | test-upgrade-durable-snapshot.sh,
+//                |                     | test-install-migration.sh
+//   typecheck     | typecheck           | pnpm typecheck (runs the checkout
+//                |                     | preflight, then turbo typecheck)
+//   lint          | lint                | pnpm lint
+//   format        | format              | pnpm format:check
+//   test          | test                | pnpm test
+//   build         | publish.yml build   | pnpm build
+//
+// Caller-provided prerequisites (kept at the pipeline level — see the comments
+// in .woodpecker/ci.yml): `bash` + `rsync` for the guard stages, `openssl` and
+// the pinned @earendil-works/pi-coding-agent for the test stage, and — on the
+// postgres path only — the ci-postgres service plus
+// `pnpm --filter @mosaicstack/db run db:migrate` before the test stage.
+//
+// This command works with DATABASE_URL set (CI postgres path) or unset (local
+// PGlite path); it never sets, exports, or requires a database itself.
+//
+// scripts/verify-release.test.mjs enforces that this stage table keeps
+// matching .woodpecker/ci.yml step-for-step, so the two surfaces cannot drift
+// apart silently.
+
+import { spawnSync } from 'node:child_process';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+export const STAGES = [
+  {
+    name: 'sanitization',
+    // Mirror of the .woodpecker/ci.yml `sanitization` step (minus its
+    // `apk add` environment prep). Kept as direct command strings here: the
+    // #1017 test-enumeration guard audits these paths through the ci.yml
+    // surface, so indirection from ci.yml into this file is not possible.
+    commands: [
+      'bash packages/mosaic/framework/tools/quality/scripts/verify-sanitized.sh',
+      'bash packages/mosaic/framework/tools/quality/scripts/check-resident-budget.sh --self-test',
+      'bash packages/mosaic/framework/tools/quality/scripts/check-resident-budget.sh',
+      'bash packages/mosaic/framework/tools/quality/scripts/check-test-enumeration.sh',
+    ],
+  },
+  {
+    name: 'upgrade-guard',
+    // Mirror of the .woodpecker/ci.yml `upgrade-guard` step (minus its
+    // `apk add` environment prep).
+    commands: [
+      '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',
+    ],
+  },
+  {
+    // `pnpm typecheck` is `pnpm preflight && turbo run typecheck`, so the
+    // checkout preflight (scripts/preflight.mjs) is part of this stage exactly
+    // as it is part of the ci.yml `typecheck` step.
+    name: 'typecheck',
+    commands: ['pnpm typecheck'],
+  },
+  {
+    name: 'lint',
+    commands: ['pnpm lint'],
+  },
+  {
+    name: 'format',
+    commands: ['pnpm format:check'],
+  },
+  {
+    // Requires `openssl` and the pinned `pi` binary on the pipeline path; see
+    // the caller-provided prerequisites above.
+    name: 'test',
+    commands: ['pnpm test'],
+  },
+  {
+    name: 'build',
+    commands: ['pnpm build'],
+  },
+];
+
+export function stageByName(name) {
+  return STAGES.find((stage) => stage.name === name);
+}
+
+function missingBinaries(bins) {
+  return bins.filter(
+    (bin) => spawnSync('sh', ['-c', `command -v ${bin} >/dev/null 2>&1`]).status !== 0,
+  );
+}
+
+function runCommand(command) {
+  const result = spawnSync(command, { shell: true, stdio: 'inherit' });
+  if (result.error) {
+    console.error(`[verify:release] failed to launch '${command}': ${result.error.message}`);
+    return false;
+  }
+  if (result.status !== 0) {
+    const reason = result.signal ? `terminated by ${result.signal}` : `exited ${result.status}`;
+    console.error(`[verify:release] command '${command}' ${reason}`);
+    return false;
+  }
+  return true;
+}
+
+// Runs the complete mandatory verification set (or, with --stage <name>, the
+// single named stage — used for wiring/smoke-testing, not for gating: only a
+// run of every stage is a terminal verification). Fails fast: the first
+// failing command aborts with a non-zero exit code. Returns the exit code.
+export function verifyRelease({ stages = STAGES } = {}) {
+  const missing = missingBinaries(['bash', 'rsync']);
+  if (missing.length > 0) {
+    console.error(
+      `[verify:release] FATAL: required binaries missing from PATH: ${missing.join(', ')}. ` +
+        'The caller provides them (ci-base bakes bash; pipelines apk add rsync).',
+    );
+    return 1;
+  }
+  for (const stage of stages) {
+    console.log(`\n[verify:release] === stage: ${stage.name} ===`);
+    for (const command of stage.commands) {
+      console.log(`[verify:release] $ ${command}`);
+      if (!runCommand(command)) {
+        console.error(
+          `[verify:release] FATAL: stage '${stage.name}' failed — verification inconclusive`,
+        );
+        return 1;
+      }
+    }
+  }
+  console.log(`\n[verify:release] all ${stages.length} stage(s) passed`);
+  return 0;
+}
+
+function main(argv) {
+  const stageFlagIndex = argv.indexOf('--stage');
+  if (stageFlagIndex !== -1) {
+    const name = argv[stageFlagIndex + 1];
+    const stage = stageByName(name);
+    if (!stage) {
+      console.error(
+        `[verify:release] unknown stage '${name ?? ''}' — expected one of: ${STAGES.map((entry) => entry.name).join(', ')}`,
+      );
+      process.exit(2);
+    }
+    process.exit(verifyRelease({ stages: [stage] }));
+  }
+  process.exit(verifyRelease());
+}
+
+if (process.argv[1] && path.resolve(process.argv[1]) === fileURLToPath(import.meta.url)) {
+  main(process.argv.slice(2));
+}

scripts/verify-release.test.mjs

@@ -0,0 +1,277 @@
+import assert from 'node:assert/strict';
+import { readFile } from 'node:fs/promises';
+import { createRequire } from 'node:module';
+import path from 'node:path';
+import test from 'node:test';
+
+import { STAGES } from './verify-release.mjs';
+
+// SDLC-D-034 checkout invariant: publication in .woodpecker/publish.yml is
+// bound to exact-commit terminal verification. This suite parses the real
+// pipeline files and fails red when the gate is bypassed, weakened, or drifts
+// out of sync with the canonical `pnpm verify:release` command.
+
+// Reuse the monorepo's existing YAML parser (@mosaicstack/mosaic's direct
+// dependency) instead of adding a root dependency or vendoring a parser.
+const mosaicRequire = createRequire(
+  path.resolve(process.cwd(), 'packages', 'mosaic', 'package.json'),
+);
+const { parse: parseYaml } = mosaicRequire('yaml');
+
+const publishYmlPath = path.join(process.cwd(), '.woodpecker', 'publish.yml');
+const ciYmlPath = path.join(process.cwd(), '.woodpecker', 'ci.yml');
+
+async function readPublishPipeline() {
+  return parseYaml(await readFile(publishYmlPath, 'utf8'));
+}
+
+// A step has an external publication effect when its name starts with
+// `publish` or when any command pushes an image to a registry.
+function pushesImage(step) {
+  return (step.commands ?? []).some((command) =>
+    /(^|\s)(\/kaniko\/executor|docker push)\b|--destination/.test(command),
+  );
+}
+
+function publishEffectSteps(pipeline) {
+  return Object.entries(pipeline.steps ?? {})
+    .filter(([name, step]) => name.startsWith('publish') || pushesImage(step))
+    .map(([name]) => name);
+}
+
+// Transitive closure of a step's depends_on graph.
+function dependencyClosure(pipeline, stepName, seen = new Set()) {
+  const dependencies = pipeline.steps?.[stepName]?.depends_on ?? [];
+  for (const dependency of dependencies) {
+    if (seen.has(dependency)) continue;
+    seen.add(dependency);
+    dependencyClosure(pipeline, dependency, seen);
+  }
+  return seen;
+}
+
+function verifyCommands(pipeline) {
+  const verify = pipeline.steps?.verify;
+  assert.ok(verify, 'publish pipeline must define a `verify` step');
+  assert.ok(Array.isArray(verify.commands), '`verify` step must have commands');
+  return verify.commands;
+}
+
+function assertCommitIdentityAssertion(commands) {
+  const text = commands.join('\n');
+  assert.match(
+    text,
+    /CI_COMMIT_SHA/,
+    '`verify` must compare the provider commit identity (CI_COMMIT_SHA)',
+  );
+  assert.match(text, /git rev-parse HEAD/, '`verify` must compare against git rev-parse HEAD');
+  assert.match(
+    text,
+    /exit 1/,
+    '`verify` must fail closed (exit 1) on identity mismatch or emptiness',
+  );
+}
+
+function assertCanonicalCommand(commands) {
+  assert.ok(
+    commands.some((command) => /^pnpm verify:release\b/.test(command.trim())),
+    '`verify` must run the canonical terminal verification command `pnpm verify:release`',
+  );
+}
+
+function assertPublishGate(pipeline) {
+  assert.ok(pipeline.steps, 'publish pipeline must define steps');
+
+  const commands = verifyCommands(pipeline);
+  assertCommitIdentityAssertion(commands);
+  assertCanonicalCommand(commands);
+
+  const effects = publishEffectSteps(pipeline);
+  assert.ok(effects.length > 0, 'publish pipeline must contain publish effect steps to guard');
+
+  for (const stepName of effects) {
+    const step = pipeline.steps[stepName];
+    assert.ok(
+      Array.isArray(step.depends_on) && step.depends_on.includes('verify'),
+      `publish effect '${stepName}' must depend DIRECTLY on the verify step (SDLC-D-034: transitively through build is not enough)`,
+    );
+    assert.ok(
+      dependencyClosure(pipeline, stepName).has('verify'),
+      `publish effect '${stepName}' must depend on a chain that includes verify`,
+    );
+  }
+  return effects;
+}
+
+test('the publish pipeline gates every publish effect behind exact-commit verification', async () => {
+  const pipeline = await readPublishPipeline();
+  const effects = assertPublishGate(pipeline);
+  assert.deepEqual(effects.sort(), [
+    'build-appservice',
+    'build-gateway',
+    'build-web',
+    'publish-next-npm',
+    'publish-npm',
+  ]);
+});
+
+test('the verify step carries no path/event short-circuit of its own', async () => {
+  const pipeline = await readPublishPipeline();
+  // A `when` filter on `verify` would let a publish effect fire on an event
+  // class that skipped verification — the gate must be unconditional.
+  assert.equal(pipeline.steps.verify.when, undefined);
+});
+
+test('a publish step that bypasses verify fails the gate checker', () => {
+  // Negative fixture: a plausible publish pipeline where `publish-npm` hangs
+  // off `build` only and `build` never chains to `verify` — the exact bypass
+  // class SDLC-D-034 closes. The checker must go red on it.
+  const bypassingPipeline = `
+steps:
+  install:
+    image: node:24-alpine
+    commands:
+      - pnpm install --frozen-lockfile
+  verify:
+    image: node:24-alpine
+    commands:
+      - |
+        if [ -z "$CI_COMMIT_SHA" ] || [ "$CI_COMMIT_SHA" != "$(git rev-parse HEAD)" ]; then
+          echo "identity mismatch" >&2
+          exit 1
+        fi
+      - pnpm verify:release
+    depends_on:
+      - install
+  build:
+    image: node:24-alpine
+    commands:
+      - pnpm build
+    depends_on:
+      - install
+  publish-npm:
+    image: node:24-alpine
+    commands:
+      - pnpm publish
+    depends_on:
+      - build
+`;
+  assert.throws(
+    () => assertPublishGate(parseYaml(bypassingPipeline)),
+    /publish-npm.*DIRECTLY.*verify/s,
+  );
+});
+
+test('a publish step chained to verify only transitively fails the gate checker', () => {
+  // Negative fixture: `build` depends on verify but `publish-npm` does not
+  // carry the direct edge — weaker than SDLC-D-034 requires of the real DAG.
+  const transitiveOnlyPipeline = `
+steps:
+  install:
+    image: node:24-alpine
+    commands:
+      - pnpm install --frozen-lockfile
+  verify:
+    image: node:24-alpine
+    commands:
+      - |
+        if [ -z "$CI_COMMIT_SHA" ] || [ "$CI_COMMIT_SHA" != "$(git rev-parse HEAD)" ]; then
+          echo "identity mismatch" >&2
+          exit 1
+        fi
+      - pnpm verify:release
+    depends_on:
+      - install
+  build:
+    image: node:24-alpine
+    commands:
+      - pnpm build
+    depends_on:
+      - install
+      - verify
+  publish-npm:
+    image: node:24-alpine
+    commands:
+      - pnpm publish
+    depends_on:
+      - build
+`;
+  assert.throws(
+    () => assertPublishGate(parseYaml(transitiveOnlyPipeline)),
+    /publish-npm.*DIRECTLY.*verify/s,
+  );
+});
+
+test('a verify step without the commit-identity assertion fails the gate checker', () => {
+  const noIdentityPipeline = `
+steps:
+  verify:
+    image: node:24-alpine
+    commands:
+      - pnpm verify:release
+  publish-npm:
+    image: node:24-alpine
+    commands:
+      - pnpm publish
+    depends_on:
+      - verify
+`;
+  assert.throws(() => assertPublishGate(parseYaml(noIdentityPipeline)), /CI_COMMIT_SHA/);
+});
+
+test('the canonical verify:release stages mirror the PR CI pipeline one-for-one', async () => {
+  const ci = parseYaml(await readFile(ciYmlPath, 'utf8'));
+  const canonical = Object.fromEntries(STAGES.map((stage) => [stage.name, stage.commands]));
+
+  // The complete mandatory set, in gate order.
+  assert.deepEqual(
+    STAGES.map((stage) => stage.name),
+    ['sanitization', 'upgrade-guard', 'typecheck', 'lint', 'format', 'test', 'build'],
+  );
+
+  // Guard stages: ci.yml commands minus its `apk add` environment prep must be
+  // exactly the canonical stage commands (order included).
+  for (const stageName of ['sanitization', 'upgrade-guard']) {
+    assert.deepEqual(
+      ci.steps[stageName].commands.filter((command) => !command.startsWith('apk add')),
+      canonical[stageName],
+      `canonical '${stageName}' stage must match the ci.yml step`,
+    );
+  }
+
+  // pnpm stages: ci.yml commands minus `corepack enable` must be exactly the
+  // canonical stage commands.
+  for (const stepName of ['typecheck', 'lint', 'format']) {
+    assert.deepEqual(
+      ci.steps[stepName].commands.filter((command) => command !== 'corepack enable'),
+      canonical[stepName],
+      `canonical '${stepName}' stage must match the ci.yml step`,
+    );
+  }
+
+  // The test stage is shared, but ci.yml wraps it in pipeline-level
+  // prerequisites the canonical command expects its caller to provide
+  // (SDLC-D-034): the postgres service + readiness wait + db:migrate, openssl,
+  // and the pinned pi runtime. None of those may be dropped silently.
+  for (const command of canonical.test) {
+    assert.ok(
+      ci.steps.test.commands.includes(command),
+      `ci.yml test step must run the canonical test stage command '${command}'`,
+    );
+  }
+  for (const fragment of [
+    'pg_isready -h ci-postgres',
+    'pnpm --filter @mosaicstack/db run db:migrate',
+    'npm install -g @earendil-works/[email protected]',
+  ]) {
+    assert.ok(
+      ci.steps.test.commands.some((command) => command.includes(fragment)),
+      `ci.yml test step must keep its pipeline-level prerequisite '${fragment}'`,
+    );
+  }
+});
+
+test('the root package.json exposes verify:release as the canonical command', async () => {
+  const packageJson = JSON.parse(await readFile(path.join(process.cwd(), 'package.json'), 'utf8'));
+  assert.match(packageJson.scripts['verify:release'], /scripts\/verify-release\.mjs/);
+});