feat(fleet): comms-block emitter + FLEET-LAUNCH runbook (#633)

Add `mosaic fleet comms-block <role> [--host]` — an explicit-arg, comms-only
emitter wrapping a new resolveCommsBlock() over readFleetCommsBlock. Unlike the
launch-time reader (which returns '' on any miss so composeContract can no-op
silently), the emitter fails loud: unknown role / missing roster → stderr +
exit 1, so an operator can safely preview any peer's view and a typo is never
a silent no-op.

Add docs/fleet/FLEET-LAUNCH.md: the canonical roster-driven launch path
(worker + orchestrator .env fold via MOSAIC_AGENT_COMMAND, which short-circuits
the line-44 yolo hardcode), 3 launch gotchas (flag conflict, MOSAIC_AGENT_NAME
baking, launchRuntime guards), the #632 preserve-list note, and the North-Star
A→B→webUI launch-config arc.

PATH A of the orchestrator-launch fix; PATH B (roster-native launch-config:
yolo toggle + command/channels emission) tracked as #636.

TDD: 6 new resolveCommsBlock cases; 177 fleet+comms tests green; typecheck,
eslint, prettier clean.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EsgTQzV5YUGk1JtCLP4B83

.woodpecker/publish.yml

@@ -4,6 +4,23 @@
 variables:
   - &node_image 'node:22-alpine'
   - &enable_pnpm 'corepack enable'
+  # Heavy kaniko image builds (~25 min) — gate them so a merge that only touches
+  # the npm-only CLI (@mosaicstack/mosaic) or docs does NOT rebuild the platform
+  # images (gateway/appservice/web do not depend on @mosaicstack/mosaic). Releases
+  # (tags) always build everything. Exclude-list keeps the default SAFE: any
+  # non-excluded change still builds, so no transitive dep can silently go stale.
+  # (Woodpecker: `when` entries are OR'd; `path` applies to push/PR only — hence
+  # the separate `event: tag` entry.)
+  - &image_build_when
+    - event: tag
+    - event: [push, manual]
+      branch: main
+      path:
+        exclude:
+          - 'packages/mosaic/**'
+          - 'docs/**'
+          - '**/*.md'
+          - '.woodpecker/**'
 
 when:
   - branch: [main]
@@ -26,6 +43,15 @@ steps:
 
   publish-npm:
     image: *node_image
+    # Publish only when a publishable package changed (or on a release tag); a
+    # pure-docs merge runs no publish. Cheap step, but gated for cleanliness.
+    when:
+      - event: tag
+      - event: [push, manual]
+        branch: main
+        path:
+          include:
+            - 'packages/**'
     environment:
       NPM_TOKEN:
         from_secret: gitea_token
@@ -91,6 +117,7 @@ steps:
 
   build-gateway:
     image: gcr.io/kaniko-project/executor:debug
+    when: *image_build_when
     environment:
       REGISTRY_USER:
         from_secret: gitea_username
@@ -116,6 +143,7 @@ steps:
 
   build-appservice:
     image: gcr.io/kaniko-project/executor:debug
+    when: *image_build_when
     environment:
       REGISTRY_USER:
         from_secret: gitea_username
@@ -141,6 +169,7 @@ steps:
 
   build-web:
     image: gcr.io/kaniko-project/executor:debug
+    when: *image_build_when
     environment:
       REGISTRY_USER:
         from_secret: gitea_username

docs/TASKS.md

@@ -61,8 +61,32 @@ Active workstream is **W1 — Federation v1**. Workers should:
 
 ## Fleet-polish bundle — boot-survival symmetry (#611) — feat/fleet-polish-bundle
 
-- Status: implemented + tested. disable-on-remove (boot-resurrection bug, TDD) + add-enable + init-R5 hard guarantee. 4 new + 147 existing fleet tests green. Detail: scratchpads/fleet-polish-bundle.md.
+- Status: MERGED to main. disable-on-remove (boot-resurrection bug, TDD) + add-enable + init-R5 hard guarantee. 4 new + 147 existing fleet tests green. Detail: scratchpads/fleet-polish-bundle.md.
 
-## Fleet enhancer role + two-agent floor (#614) — feat/fleet-enhancer-floor (stacked on #612)
+## Fleet enhancer role + two-agent floor (#614) — feat/fleet-enhancer-floor
 
-- Status: implemented + tested. enhancer added to 4 presets; init guarantees 1 orchestrator + >=1 enhancer; remove protects the sole enhancer; enhancer role doc. 155 fleet tests green. Detail: scratchpads/fleet-enhancer-floor.md.
+- Status: MERGED to main. enhancer added to 4 presets; init guarantees 1 orchestrator + >=1 enhancer; remove protects the sole enhancer; enhancer role doc. 155 fleet tests green. Detail: scratchpads/fleet-enhancer-floor.md.
+
+## F4 — Orchestrator chat connector + Matrix (#616) — feat/f4-matrix-connector
+
+- Status: Phase 1 MERGED (#617: connector interface send/subscribe/health + registry + roster schema + design). Phase 2a (#618): Matrix CS-API client + factory. 20 connector tests green; no fleet.ts changes. Remaining Phase 2: init/configure connector-selection UX + roster wiring, systemd launch wiring, Conduit deploy guide. Detail: scratchpads/f4-matrix-connector.md.
+
+## Fleet onboarding-injection — comms cheat-sheet + peer roster (#620) — feat/fleet-comms-onboarding
+
+- Status: implemented + tested. Injects # Fleet Comms (peer roster + cross-host agent-send commands + FLIP-reply + --verify) into each spawned fleet agent via composeContract; optional per-agent host/ssh/socket roster fields (socket: named → -L, unset → default socket no -L). 10 + 2 tests green. Detail: scratchpads/fleet-comms-onboarding.md.
+
+## Fleet stand-up fixes — model_hint→--model + socket-default trap (#626) — feat/fleet-standup-fixes
+
+- Status: implemented + tested. FIX1 model_hint→MOSAIC_AGENT_MODEL→--model. FIX2 absent socket = default tmux socket (no -L) across parse/spawn/systemd-unit/observe (socketArgs helper, bare-empty shellEnvValue, conditional -L). 158 fleet tests green; shipped presets unaffected (explicit socket_name). Detail: scratchpads/fleet-standup-fixes.md.
+
+## north-star doctrine consolidation — doc PR — feat/north-star-doctrine
+
+- Status: applied Mos's consolidated merge-map to docs/fleet/north-star.md (budget governance + control plane/central register + 200k cap + delegation + unified-identity Fleet + role-based naming + tmux security + drift re-captures). Doctrine only; #622/#623/#625/#628 out-of-scope. Conflict checklist green. Detail: scratchpads/north-star-doctrine.md.
+
+## #631 — re-seed preserves user fleet data (CRITICAL) — fix/631-reseed-preserves-fleet-data
+
+- Status: implemented + tested. PRIMARY: install.sh PRESERVE_PATHS += fleet/\*.yaml + fleet/agents + fleet/run (glob-aware cp-fallback); TS parity. SECONDARY: refreshActiveFleetUnits propagates unit fixes to ~/.config/systemd/user on mosaic update. bash F6 + TS + unit tests green. Detail: scratchpads/631-reseed-preserves-fleet.md.
+
+## #633 — comms-block emitter + FLEET-LAUNCH runbook — feat/633-comms-block-runbook
+
+- Status: implemented + tested (TDD). `mosaic fleet comms-block <role> [--host]` wraps resolveCommsBlock → readFleetCommsBlock; fails loud (stderr + exit 1) on unknown role / missing roster instead of silent empty. docs/fleet/FLEET-LAUNCH.md runbook: worker path + orchestrator .env fold (MOSAIC_AGENT_COMMAND; line-41 [-z] short-circuits line-44 yolo hardcode) + 3 launch gotchas + #632 preserve note + North-Star 4-field arc (harness ✅/model ✅ roster-native today; yolo + command/channels = PATH B #636). 177 fleet+comms tests green (6 new resolveCommsBlock cases). PATH A of the A→B→webUI arc. Detail: scratchpads/633-comms-block-runbook.md.

docs/fleet/FLEET-LAUNCH.md

@@ -0,0 +1,114 @@
+# Fleet Launch Runbook
+
+How every Mosaic fleet agent — workers **and** the orchestrator — is launched, and how to
+configure each one. The guiding principle: **one roster-driven launcher**. There is no bespoke
+per-agent launch script; the roster plus per-agent `.env` files are the single source of launch
+config.
+
+## The launch chain
+
+| Layer            | File                                              | Responsibility                                                                                                                                              |
+| ---------------- | ------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| systemd unit     | `mosaic-agent@<role>.service`                     | One templated unit per role; `ExecStart` runs the session launcher with the instance name `%i`. Defaults `MOSAIC_AGENT_RUNTIME=pi`, `MOSAIC_AGENT_NAME=%i`. |
+| session launcher | `tools/fleet/start-agent-session.sh <role>`       | Builds the launch command, opens the tmux pane, wires the heartbeat.                                                                                        |
+| launch command   | `mosaic yolo <runtime>` (or a per-agent override) | Replaces the pane's foreground process with the runtime, fully seeded.                                                                                      |
+| seeding          | `mosaic`'s `composeContract()`                    | Injects the Constitution/USER/TOOLS/runtime contract, `*.local` overlays, **and** the Fleet-Comms cheat-sheet — all via `--append-system-prompt`.           |
+
+Per-agent overrides live in `fleet/agents/<role>.env`, generated from `roster.yaml` by
+`generateAgentEnv` (`packages/mosaic/src/commands/fleet.ts`) and consumed by the launcher.
+
+## Worker launch path (default)
+
+1. `roster.yaml` carries each agent's `runtime` and optional `model_hint`.
+2. `generateAgentEnv` emits `fleet/agents/<role>.env` with `MOSAIC_AGENT_NAME`,
+   `MOSAIC_AGENT_RUNTIME`, and `MOSAIC_AGENT_MODEL`.
+3. `start-agent-session.sh` has no `MOSAIC_AGENT_COMMAND` set, so it falls through to the default
+   (line ~44):
+   ```sh
+   MOSAIC_AGENT_COMMAND="mosaic yolo $MOSAIC_AGENT_RUNTIME${MOSAIC_AGENT_MODEL:+ --model $MOSAIC_AGENT_MODEL}"
+   ```
+4. The launcher bakes `MOSAIC_AGENT_NAME` into the pane command (line ~118), so `composeContract`
+   can inject the Fleet-Comms cheat-sheet for that role.
+
+That is the whole worker path: roster → `.env` → `mosaic yolo <runtime>` → seeded pane.
+
+## Orchestrator fold (PATH A — ships today)
+
+The orchestrator is **just another roster agent** launched through the canonical path — not a
+snowflake script.
+
+| Piece              | Value                               |
+| ------------------ | ----------------------------------- |
+| host-side launcher | `orchestrator-launch.sh`            |
+| systemd unit       | `mosaic-fleet-orchestrator.service` |
+| tmux session       | `orchestrator` (role-named)         |
+
+Set its launch command via `fleet/agents/orchestrator.env`:
+
+```sh
+MOSAIC_AGENT_COMMAND='mosaic yolo claude --channels plugin:discord@<channel>'
+```
+
+When `MOSAIC_AGENT_COMMAND` is set, `start-agent-session.sh`'s `if [ -z "$MOSAIC_AGENT_COMMAND" ]`
+guard (line ~41) is false, so the line-44 default — **including its hardcoded `yolo`** — is skipped
+entirely. The override fully controls the runtime and flags. Routing through `mosaic yolo claude`
+(rather than a raw `claude` invocation) is what gives the orchestrator the same full
+`composeContract` seeding + Fleet-Comms cheat-sheet as every worker, with `--channels` and any
+other flags passed straight through to the `claude` binary.
+
+## Launch gotchas
+
+1. **Flag conflict.** `mosaic yolo claude` already injects `--dangerously-skip-permissions`. Do
+   **not** also pass `--permission-mode bypassPermissions` — the `claude` binary would receive both.
+   Use `mosaic yolo claude …` alone (yolo covers the unattended posture), **or** non-yolo
+   `mosaic claude --permission-mode bypassPermissions …`. Never mix the two.
+2. **`MOSAIC_AGENT_NAME` must reach the pane.** The launcher bakes it from the instance name, and
+   `composeContract` gates the Fleet-Comms block on it (`launch.ts`, in `composeContract`) — **and**
+   the role must be a member of `roster.yaml`, or the block resolves empty.
+3. **`launchRuntime` guards.** `mosaic yolo claude` runs `checkSoul` / `checkRuntime` /
+   `checkSequentialThinking`. The host needs `SOUL.md` and the sequential-thinking MCP, or the
+   launch aborts (a raw `claude` invocation skipped these checks). Dry-run the composed command in a
+   throwaway tmux session before swapping a live launcher.
+
+## Why per-agent `.env` survives upgrades (#632)
+
+`install.sh` `PRESERVE_PATHS` includes `fleet/*.yaml`, `fleet/agents`, and `fleet/run`, so
+`mosaic update`'s framework re-seed **preserves** your roster and per-agent `.env` overrides
+(glob-aware `cp` fallback; matching TS parity in `file-adapter.ts`). Before #632, an auto re-seed
+could wipe them — which is exactly why PATH A's `.env` override is safe to rely on now.
+
+## Inspecting the comms wiring
+
+- `mosaic fleet comms-block <role>` prints the Fleet-Comms cheat-sheet a given role receives at
+  launch — its `[host:session]` identity, the exact `agent-send.sh` command for each peer, and the
+  FLIP / `--verify` conventions. `--host <h>` previews a cross-host view. An unknown role or missing
+  roster **fails loud** (stderr + non-zero exit), so a typo is never a silent no-op.
+- Versus `mosaic compose-contract <runtime>`: that emits the **whole** system prompt and reads the
+  role from `MOSAIC_AGENT_NAME` (a full-prompt smoke test). `comms-block` is the targeted,
+  explicit-arg, comms-only view — e.g. `mosaic fleet comms-block coder0-0` to preview a peer.
+
+## North Star / future direction
+
+**Vision:** a webUI lets the user edit each agent's launch config — switch **harness**
+(claude / pi / codex / opencode), toggle **yolo**, pick a **model**, set a **command/channels**
+override — with no terminal.
+
+**Continuity — this is not a new launch path.** It is a data-model + UI-binding layer over the
+existing roster-driven launcher. Field-by-field status today:
+
+| Launch-config field      | Roster-native today? | Mechanism / gap                                                                                                                                          |
+| ------------------------ | -------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| **harness** (`runtime`)  | ✅ end-to-end        | `roster.runtime` → `generateAgentEnv` emits `MOSAIC_AGENT_RUNTIME` → launcher line 44. UI just writes the field.                                         |
+| **model** (`model_hint`) | ✅ end-to-end        | `roster.model_hint` → `MOSAIC_AGENT_MODEL` → launcher line 44 `--model`. UI just writes the field.                                                       |
+| **yolo**                 | ❌ new               | Launcher line 44 **hardcodes** `mosaic yolo`. A non-yolo toggle needs a roster `yolo` field → emit `MOSAIC_AGENT_YOLO` → make line 44 conditional.       |
+| **command / channels**   | ❌ new               | `MOSAIC_AGENT_COMMAND` is **consumed** (launcher line ~12) but `generateAgentEnv` does not emit it. Needs a roster `command`/`channels` field → emitted. |
+
+**The arc:**
+
+- **A** — `.env` `MOSAIC_AGENT_COMMAND` hatch: manual, ships now, kept safe across upgrades by #632.
+- **B** — roster-native launch-config: harness + model are already there; add the **yolo** toggle
+  (line-44 conditional) and **command/channels** emission to complete the data model.
+- **webUI** — binds dropdowns/toggles directly to those four roster fields.
+
+PATH A's `.env` override is the **manual form** of exactly what PATH B makes roster-native and the
+webUI edits — one continuous arc, not three separate features. PATH B is tracked as #636.

docs/fleet/PRD.md

@@ -7,10 +7,10 @@
 
 ## Problem
 
-The durable tmux fleet runs on the isolated `mosaic-factory` socket. That isolation
+The durable tmux fleet runs on the isolated `mosaic-fleet` socket. That isolation
 (which protects the operator's default tmux) makes the fleet **invisible** to default
 tooling, and truth is split across three planes no single command joins — systemd
-(`systemctl --user`), tmux (`-L mosaic-factory`), and the process tree (`pstree`).
+(`systemctl --user`), tmux (`-L mosaic-fleet`), and the process tree (`pstree`).
 `agent tail` (`capture-pane`) returns **blank for full-screen TUIs**, and `agent send`
 confirms only keystroke injection, not acceptance. Net: the operator has near-zero
 observability and no safe way to watch a session.
@@ -56,7 +56,7 @@ observability and no safe way to watch a session.
 
 ## Acceptance criteria
 
-- `mosaic fleet ps` shows all 5 live sessions on `mosaic-factory` with correct
+- `mosaic fleet ps` shows all 5 live sessions on `mosaic-fleet` with correct
   pane/pid/idle and flags the dogfood **drift** (`canary-pi` runtime=pi but pane runs
   `dogfood-agent.py`) and the **boot-enable** gap (active but disabled).
 - Killing one agent's pane flips its row to dead/stale within one `interval`.
@@ -72,7 +72,7 @@ observability and no safe way to watch a session.
 - Unit/CLI specs in `packages/mosaic/src/commands/fleet.spec.ts` (and a new
   `fleet-ps`/`watch`/`send-verify` spec) using the injected `CommandRunner` to assert
   exact tmux/systemd command construction and JSON shape (tenant+host present).
-- Situational: run against the live `mosaic-factory` fleet; capture `fleet ps` output,
+- Situational: run against the live `mosaic-fleet` fleet; capture `fleet ps` output,
   a kill-and-detect cycle, a read-only `watch`, and a `send --verify` pass/fail pair.
 
 ## Known limitations

docs/fleet/TASKS.md

@@ -7,18 +7,18 @@
 > Mission: `mvp-20260312` · PRD: [docs/fleet/PRD.md](./PRD.md) · North star: [docs/fleet/north-star.md](./north-star.md)
 > Status: `not-started` | `in-progress` | `done` | `blocked` | `failed`
 
-| id            | status      | description                                                                                                        | depends_on            | agent       | pr  | notes                                                                                                                         |
+| id            | status      | description                                                                                                        | depends_on            | agent       | pr  | notes                                                                                                                       |
-| ------------- | ----------- | ------------------------------------------------------------------------------------------------------------------ | --------------------- | ----------- | --- | ----------------------------------------------------------------------------------------------------------------------------- |
+| ------------- | ----------- | ------------------------------------------------------------------------------------------------------------------ | --------------------- | ----------- | --- | --------------------------------------------------------------------------------------------------------------------------- |
-| FLEET-OBS-000 | done        | Plan: north-star + Phase-2 PRD + workstream scaffolding                                                            | —                     | lead        | —   | persisted 2026-06-20 on `feat/fleet-observability`                                                                            |
+| FLEET-OBS-000 | done        | Plan: north-star + Phase-2 PRD + workstream scaffolding                                                            | —                     | lead        | —   | persisted 2026-06-20 on `feat/fleet-observability`                                                                          |
-| FLEET-OBS-001 | done        | Heartbeat protocol v1 spec finalized in PRD + framework doc                                                        | FLEET-OBS-000         | lead        | —   | file-based `~/.config/mosaic/fleet/run/<agent>.hb`; spec in PRD                                                               |
+| FLEET-OBS-001 | done        | Heartbeat protocol v1 spec finalized in PRD + framework doc                                                        | FLEET-OBS-000         | lead        | —   | file-based `~/.config/mosaic/fleet/run/<agent>.hb`; spec in PRD                                                             |
-| FLEET-OBS-002 | in-progress | Implement heartbeat responder in `dogfood-agent.py`                                                                | FLEET-OBS-001         | fleet-coder | —   | dispatched to ad-hoc `mosaic yolo` fleet agent (dogfood)                                                                      |
+| FLEET-OBS-002 | in-progress | Implement heartbeat responder in `dogfood-agent.py`                                                                | FLEET-OBS-001         | fleet-coder | —   | dispatched to ad-hoc `mosaic yolo` fleet agent (dogfood)                                                                    |
-| FLEET-OBS-003 | done        | `mosaic fleet ps` — join systemd+tmux+proc+idle+heartbeat; tenant+host tagged; drift + boot-enable flags; `--json` | FLEET-OBS-001         | worker      | —   | commit ab47831; LIVE-verified on mosaic-factory; caught canary-pi DRIFT + BOOT-ENABLE. Polish: idleSeconds parse returns null |
+| FLEET-OBS-003 | done        | `mosaic fleet ps` — join systemd+tmux+proc+idle+heartbeat; tenant+host tagged; drift + boot-enable flags; `--json` | FLEET-OBS-001         | worker      | —   | commit ab47831; LIVE-verified on mosaic-fleet; caught canary-pi DRIFT + BOOT-ENABLE. Polish: idleSeconds parse returns null |
-| FLEET-OBS-004 | done        | `mosaic agent watch <name>` — read-only join (no resize, no keystrokes)                                            | FLEET-OBS-000         | worker      | —   | `attach -r`; verb wired                                                                                                       |
+| FLEET-OBS-004 | done        | `mosaic agent watch <name>` — read-only join (no resize, no keystrokes)                                            | FLEET-OBS-000         | worker      | —   | `attach -r`; verb wired                                                                                                     |
-| FLEET-OBS-005 | done        | `mosaic agent send --verify` — delivery/acceptance receipt                                                         | FLEET-OBS-000         | worker      | —   | --verify flag; draft-heuristic verify                                                                                         |
+| FLEET-OBS-005 | done        | `mosaic agent send --verify` — delivery/acceptance receipt                                                         | FLEET-OBS-000         | worker      | —   | --verify flag; draft-heuristic verify                                                                                       |
-| FLEET-OBS-006 | done        | CLI specs for ps/watch/send-verify (tenant+host shape, command construction)                                       | FLEET-OBS-003,004,005 | worker      | —   | 62 tests green (31 new); re-verified by lead                                                                                  |
+| FLEET-OBS-006 | done        | CLI specs for ps/watch/send-verify (tenant+host shape, command construction)                                       | FLEET-OBS-003,004,005 | worker      | —   | 62 tests green (31 new); re-verified by lead                                                                                |
-| FLEET-OBS-007 | not-started | Framework doc: fleet observability guide + verbs                                                                   | FLEET-OBS-003,004,005 | lead        | —   | `docs/guides/` or `framework/tools/.../README`                                                                                |
+| FLEET-OBS-007 | not-started | Framework doc: fleet observability guide + verbs                                                                   | FLEET-OBS-003,004,005 | lead        | —   | `docs/guides/` or `framework/tools/.../README`                                                                              |
-| FLEET-OBS-008 | not-started | Independent review + dogfood verification on live fleet                                                            | FLEET-OBS-002..007    | reviewer    | —   | author ≠ reviewer; capture evidence in scratchpad                                                                             |
+| FLEET-OBS-008 | not-started | Independent review + dogfood verification on live fleet                                                            | FLEET-OBS-002..007    | reviewer    | —   | author ≠ reviewer; capture evidence in scratchpad                                                                           |
-| FLEET-OBS-009 | not-started | Open PR → green CI (queue guard) → squash-merge → close `fleet-observability-1`                                    | FLEET-OBS-008         | lead        | —   | trunk merge; no direct push to main                                                                                           |
+| FLEET-OBS-009 | not-started | Open PR → green CI (queue guard) → squash-merge → close `fleet-observability-1`                                    | FLEET-OBS-008         | lead        | —   | trunk merge; no direct push to main                                                                                         |
 
 ## Proposed MVP rollup row (for the MVP orchestrator — not written by this workstream)
 

docs/fleet/f4-matrix-connector.md

@@ -0,0 +1,92 @@
+# F4 — Orchestrator chat connector + Matrix (local homeserver)
+
+> **Issue:** #616 · **Doctrine:** `docs/fleet/north-star.md` (#613) — orchestrator-chat-connector decision.
+> **Status:** Phase 1 (abstraction + scaffold) in this PR; Phase 2+ are follow-ups (below).
+
+## Goal
+
+The fleet **orchestrator** is the operator's single point of contact. The north-star makes the
+chat channel a **user-chosen connector** — tmux today, Discord live ("Mos"), with Matrix /
+Telegram / Slack configurable. F4 adds **Matrix** (local homeserver) as a **peer** connector and,
+first, the small **connector abstraction** that makes connectors pluggable without touching fleet
+core.
+
+## The abstraction (Phase 1 — this PR)
+
+Connectors implement one small, uniform interface (`src/fleet/connectors/types.ts`):
+
+```ts
+interface OrchestratorConnector {
+  readonly kind: 'tmux' | 'discord' | 'matrix';
+  send(message: OutboundMessage): Promise<SendResult>; // orchestrator → human
+  subscribe(handler: (m: InboundMessage) => void): Unsubscribe; // human → orchestrator
+  health(): Promise<ConnectorHealth>; // reachable + authenticated
+}
+```
+
+- **send / subscribe / health** — the only surface fleet core depends on. `SendResult` is the
+  ack half; `health()` is the liveness half.
+- **Thread-aware by metadata** — `OutboundMessage.threadId` / `InboundMessage.threadId` are
+  optional, so thread-capable connectors (Matrix rooms/threads, the future first-party Mosaic
+  Discord plugin) fit **without an interface change**.
+- **Registry** (`registry.ts`) — implementations register a factory by kind; `createConnector(config)`
+  resolves one from roster config. Phase 1 ships the registry + `resolveConnectorKind` (defaults
+  `tmux` when a roster declares no connector — **back-compat**); the factories land in Phase 2.
+
+### Config model
+
+A roster may carry an optional `connector` block (`roster.schema.json`); absent ⇒ tmux.
+
+```yaml
+connector:
+  kind: matrix # tmux | discord | matrix
+  matrix:
+    homeserver_url: https://matrix.example.internal
+    user_id: '@mos:example.internal'
+    room_id: '!abc:example.internal'
+```
+
+**Secrets are never in the roster.** `MATRIX_ACCESS_TOKEN` / `DISCORD_BOT_TOKEN` come from the
+environment (the gateway env-config pattern that already masks them). The sanitization gate would
+reject a token committed to a shipped file anyway.
+
+## Matrix connector (Phase 2)
+
+The connector speaks the **Matrix client-server API** directly over HTTPS (`fetch` — no SDK needed
+for MVP), so it is **homeserver-agnostic**:
+
+| Op          | Matrix CS-API                                                            |
+| ----------- | ------------------------------------------------------------------------ |
+| `send`      | `PUT /_matrix/client/v3/rooms/{roomId}/send/m.room.message/{txnId}`      |
+| `subscribe` | `GET /_matrix/client/v3/sync` (long-poll, `since` token) → room timeline |
+| `health`    | `GET /_matrix/client/versions` (reachable) + `…/account/whoami` (authed) |
+| threads     | `m.thread` relations ↔ `threadId`                                        |
+
+## Local homeserver (infra, not connector code)
+
+Strategic default: a **self-hosted** homeserver on our own infra — no third-party gateway.
+
+- **Default: Conduit** (Rust, single binary, low resource) — trivial to stand up for a fleet/dev
+  homeserver.
+- **Alternative: Synapse** (mature, feature-complete) for scale.
+
+The connector only needs `homeserver_url` + `user_id` + `room_id` + an access token, so the
+homeserver choice is a **deployment** concern (a Phase-2 deploy guide), not connector code.
+
+## Phasing
+
+| Phase | Scope                                                                                   | This PR |
+| ----- | --------------------------------------------------------------------------------------- | ------- |
+| **1** | Connector interface + types, registry + kind resolution, roster `connector` schema, doc | ✅ yes  |
+| 2     | Matrix CS-API client (fetch-based send/sync/health) + registered factory + tests        | follow  |
+| 2     | `fleet init` / `configure` connector-selection UX; roster parse wires the block         | follow  |
+| 2     | systemd launch wiring so the orchestrator starts on the chosen connector                | follow  |
+| 3     | Conduit deploy guide; first-party Mosaic Discord (threads) registers as a connector     | follow  |
+
+## Back-compat & boundaries
+
+- Existing rosters (no `connector`) resolve to tmux — **zero change**.
+- Fleet core never branches on connector kind; it depends only on the interface.
+- Cross-host reach rides the **federation** layer (W1), not a bespoke broker (north-star assumption).
+- Phase 1 touches **no** `fleet.ts` core (a self-contained `connectors/` module), so it is
+  independent of the in-flight fleet-config PRs.

docs/fleet/north-star.md

@@ -55,14 +55,22 @@ The Fleet inherits — does not re-invent — the MVP's hard requirements:
 
 One **definition** is the source of truth; the **session** is how it runs.
 
-| Layer                            | Owner                                                                                       | Phase-2 reality                                        | Destination                                             |
+| Layer                            | Owner                                                                                       | Phase-2 reality                                        | Destination                                                                                                                         |
-| -------------------------------- | ------------------------------------------------------------------------------------------- | ------------------------------------------------------ | ------------------------------------------------------- |
+| -------------------------------- | ------------------------------------------------------------------------------------------- | ------------------------------------------------------ | ----------------------------------------------------------------------------------------------------------------------------------- |
-| **Definition + identity + auth** | gateway / `mosaic-as` (scoped tokens, #541)                                                 | `roster.yaml` (tenant-tagged)                          | one definition; `mosaic agent --new` materializes it    |
+| **Definition + identity + auth** | gateway / `mosaic-as` (scoped tokens, #541)                                                 | `roster.yaml` (tenant-tagged)                          | one definition; `mosaic agent --new` materializes it                                                                                |
-| **Tenancy boundary**             | **Linux uid per tenant** (linger, own `systemd --user`, own socket, own `~/.config/mosaic`) | one tenant: `jarvis` = tenant zero                     | uid-per-tenant; federation aggregates across hosts      |
+| **Tenancy boundary**             | **Linux uid per tenant** (linger, own `systemd --user`, own socket, own `~/.config/mosaic`) | one tenant: `jarvis` = tenant zero                     | uid-per-tenant; federation aggregates across hosts                                                                                  |
-| **Runtime**                      | per-tenant tmux session on isolated socket                                                  | dogfood stub sessions (live now on `mosaic-factory`)   | claude/codex/pi/opencode TUIs                           |
+| **Runtime**                      | per-tenant tmux session on isolated socket                                                  | dogfood stub sessions (live now on `mosaic-factory`)   | claude/codex/pi/opencode TUIs                                                                                                       |
-| **Liveness**                     | **heartbeat protocol** every runtime answers                                                | protocol defined + dogfood stub answers it             | all runtimes answer; "healthy" ≠ "pane alive"           |
+| **Liveness**                     | **heartbeat protocol** every runtime answers                                                | protocol defined + dogfood stub answers it             | all runtimes answer; "healthy" ≠ "pane alive"                                                                                       |
-| **Observation**                  | read-only `watch` (native tmux) + `pipe-pane` stream                                        | CLI `watch`/`ps`; explicit opt-in `attach` for control | + auth-gated webUI streams                              |
+| **Observation**                  | read-only `watch` (native tmux) + `pipe-pane` stream                                        | CLI `watch`/`ps`; explicit opt-in `attach` for control | + auth-gated webUI streams                                                                                                          |
-| **Control plane**                | **federation** across hosts × tenants                                                       | records already carry `tenant_id` + `host`             | federated gateways expose fleet state; webUI in Phase 5 |
+| **Control plane**                | **federation** across hosts × tenants                                                       | records already carry `tenant_id` + `host`             | federated gateways expose fleet state; webUI in Phase 5                                                                             |
+| **Central register**             | Postgres `fleet` schema (gateway instance); access via gateway API only                     | _none in PoC_ (files + `roster.yaml`)                  | agents, missions, tasks, heartbeats, spend — single network-accessible SSOT; docs = generated projections                           |
+| **Budget / spend governance**    | **per-tenant budget policy** ingested by the orchestrator + routing layer                   | none today (spend is unmetered)                        | usage-vs-limit feedback ingested; spend auto-paced to the limit window; per-provider/per-account/concurrency/API-$ budgets enforced |
+
+> **PoC socket hygiene:** the PoC fleet runs on the **default tmux socket** (no `-L`).
+> The named production-isolation socket is **`mosaic-fleet`** (matches the product brand);
+> an absent roster `socket_name` means the default socket everywhere (spawn, `fleet ps`,
+> onboarding cheat-sheet). The legacy dogfood canary still runs on the old `mosaic-factory`
+> socket pending migration.
 
 ## Operating model (inherited, not reinvented)
 
@@ -73,6 +81,37 @@ diff-sanity → squash-merge → verify), **decide-and-inform** cadence, and a d
 this model. See `mosaicstack-aiguide` whitepapers 01 (inter-agent comms) and 03
 (orchestration model) for the rationale.
 
+## Fleet roster — the two-agent floor and the role library
+
+A fleet is **never a single agent**. The minimum viable fleet is **two**:
+
+| Role             | Mandate                                                                                                                                                                                                                                                                                                                                                                 | Boundaries                                                                                 |
+| ---------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------ |
+| **Orchestrator** | The user's **single point of contact**. Owns the general flow, keeps agentic actions on-target, and **adds/removes agents from the fleet at will** to meet goals and user needs. Exactly **one** per fleet (the existing R5 invariant).                                                                                                                                 | Delegates source work; never the sole worker.                                              |
+| **Enhancer**     | The fleet's **continuous-improvement loop**. Monitors fleet activity, analyzes for enhancements/optimizations, builds a **plan of remediation**, and — **with the orchestrator** — upgrades fleet capability: tool creation/repair, skills, harness improvements, and **bug reports filed to Mosaic Stack** for proper remediation. Recommends which agents are needed. | **Does not code, review code, or perform delivery tasks.** Improvement and diagnosis only. |
+
+> **Why two, not one:** the orchestrator drives delivery; the enhancer makes the fleet
+> _get better at delivering_ over time. The enhancer is how the fleet self-heals its tools,
+> skills, and harnesses, and how real defects flow back to Mosaic Stack as bug reports.
+> Together they are the irreducible core — every other role is added on demand.
+
+A **general** fleet starts at this floor: the orchestrator (advised by the enhancer)
+materializes whatever roles prove necessary over the mission's life. Specialized presets
+(coding, research, etc.) seed additional roles up front, but all reduce to the same two-agent
+spine plus an on-demand **role library**:
+
+| Role profile        | Purpose                                                                           |
+| ------------------- | --------------------------------------------------------------------------------- |
+| **orchestrator**    | point of contact, flow control, fleet composition (1 per fleet)                   |
+| **enhancer**        | fleet monitoring, optimization, tool/skill/harness upgrades, upstream bug reports |
+| **coder**           | implementation (worker; stops at PR-open)                                         |
+| **code review**     | independent code review gate                                                      |
+| **security review** | security/auth/secret review gate                                                  |
+| **research**        | investigation, synthesis, options analysis                                        |
+| **board**           | deliberation panel — moonshot, contrarian, technical, business, financial lenses  |
+| **operations**      | infra, deploy, health, incident response                                          |
+| _…extensible_       | new profiles added as missions demand (orchestrator + enhancer decide)            |
+
 ## Invariants — "maximal vision, incremental delivery, zero foreclosure"
 
 Every artifact, starting Phase 2, MUST:
@@ -82,6 +121,67 @@ Every artifact, starting Phase 2, MUST:
 3. Define **healthy = answered a heartbeat within N seconds**, never just "pane alive".
 4. Make **observation read-only by default**; control is an explicit, separate, opt-in verb.
 
+> **OPS INVARIANT — runtime agents need a real TTY.** Claude/Codex/pi/opencode agents
+> cannot be bare-launched from a systemd `ExecStart`; a durable harness with a real PTY is
+> required. This is **why `start-agent-session.sh` launches into tmux** and uses a
+> `MOSAIC_AGENT_COMMAND` override rather than running the runtime directly under systemd.
+
+## Budget & token governance (first-class fleet concern)
+
+Spend is a fleet-level resource, not a per-agent afterthought. The fleet treats token
+and API-dollar budget the way it treats liveness: a signal every runtime exposes and the
+control plane is accountable for. This rides the same primitives as everything else —
+`tenant_id` + `host` on every spend record, **read-only metering by default**, and the
+**federation** layer as the cross-host aggregation point (W1) — so budgeting is zero-foreclosure
+from day one even while one tenant exists.
+
+**Two spend regimes, one policy surface:**
+
+| Regime                                                  | Feedback signal                                                          | Fleet obligation                                                                                        |
+| ------------------------------------------------------- | ------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------- |
+| **OAuth-subscription runtimes** (Claude sub, Codex sub) | runtime exposes **current-usage-vs-limit** within a rolling limit window | **ingest** the signal per sub-account; **auto-pace** agentic spend so the window is not exhausted early |
+| **API-token runtimes** (metered per token)              | provider billing / token counts                                          | enforce **hard $-spend ceilings**; on breach, **downgrade → queue → refuse** (below)                    |
+
+**Auto-pacing law (OAuth subs) — EVEN-SPREAD default (Jason override, 2026-06-22):** the fleet
+paces agentic token spend to consume the limit window **evenly over remaining time**:
+target rate = _(remaining usage available)_ ÷ _(remaining time in the window)_. Example: 100% of
+a 7-day window = **~14.285%/day**; the system tracks current usage and continuously re-splits the
+remainder evenly to hold pace. **Anticipated token-spend-per-task is the budgeting informant** —
+tasks are scheduled against the daily pace, not run until the quota is gone. Rationale: spreading
+delivery evenly beats rapidly exhausting usage and losing **multiple days of momentum**.
+**Rapid pacing / overspend requires EXPLICIT user authorization;** absent it, even-spread holds.
+Pacing is a control-plane decision, surfaced read-only before it throttles a lane.
+
+**Hard-cap breach behavior (ladder):** when a budget ceiling is hit mid-work, the fleet
+**downgrades first** (opus → sonnet → haiku, then Claude → Codex), **queues** the lane at the
+cheapest floor until the window resets, and **refuses** only as a last resort. Refusal is never
+the first response to a breach.
+
+**Spend accounting, learning & telemetry:**
+
+- **Multi-subscription auto-routing:** a tenant with multiple subscriptions may let the fleet
+  **auto-route work to the account with the most available usage** (within budget policy).
+- **Historical spend learning:** every task's token spend is **recorded**; historical data
+  continuously updates known **spend-per-task**, **typical daily spend**, and projections — so
+  estimates self-correct and pacing stays on target.
+- **Projected + actual spend on artifacts (Mosaic Stack mandate):** PRDs, missions, and task
+  decomposition **MUST note projected AND actual token spend** — a Mosaic Stack process standard
+  (template-level), tracked separately as **#622**.
+- **Anonymized telemetry → mosaicstack.dev:** spend data is reported (anonymous) to the
+  mosaicstack.dev telemetry endpoint so other agents/fleets budget and optimize from real,
+  anonymized data. Product workstream, tracked separately as **#623**.
+
+**User-settable budgets (the policy surface).** A tenant operator can set budgets for every
+configured **provider** (per-provider ceilings), the **account-to-task mapping**, the **agentic
+routing flow**, **concurrency** (the spend multiplier), and **hard API-token $-limits**. Budgets
+are enforced at the orchestrator + routing boundary, not inside individual workers (a worker never
+decides its own budget — see delegation discipline).
+
+**Budget CLI UX (#558):** `mosaic budget set --reset-at` sets the window reset; reset-datetimes
+carry **confidence tags** (`user` / `provider` / `estimated` / `unknown`); and **urgency/criticality
+is a dispatch-gate modifier** — high-urgency work may override even-spread pacing **within
+authorization**. (Also feeds the budgeting workstream, not only this doc.)
+
 ## Observation model
 
 | Verb                                | Behavior                                                                                           |
@@ -96,15 +196,83 @@ Every artifact, starting Phase 2, MUST:
 > (blank for full-screen TUIs), and `attach` is read-write + resizes the session. The
 > verbs above restore "join and observe" safely.
 
+## Control plane & central register
+
+### Why the register must be Postgres
+
+The fleet is multi-host (w-jarvis + dragon-lin + future). A SQLite file is a local
+file — it is not a network service and cannot be shared across hosts. Beyond topology,
+Postgres MVCC eliminates the concurrent-writer corruption class Hermes hit with SQLite
+under multi-agent access.
+
+Access is exclusively through the **gateway API** (`apps/gateway` — typed, auth-gated,
+scoped tokens). No agent or dispatcher pane ever holds a raw DB credential; a
+compromised pane cannot corrupt or exfiltrate the register.
+
+### Architecture (layers)
+
+| Layer                  | Responsibility                                                                                                | Implementation                                                                                                                                                                                            |
+| ---------------------- | ------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| **Register**           | Source of truth: agents, missions, tasks, heartbeats, spend                                                   | Postgres `fleet` schema — existing stack instance (`@mosaicstack/db`)                                                                                                                                     |
+| **Access**             | Typed, auth-gated API                                                                                         | Gateway `fleet/*` routes                                                                                                                                                                                  |
+| **Dispatcher**         | Brief classification, BOD review, planning/coding/review/test/deploy sequencing + gates → fleet task dispatch | **forge pipeline engine** (`runPipeline`/`resumePipeline`, brief classifier, BOD) **+ thin `forge-exec` adapter → `agent-send.sh`**; NOT a new daemon — forge is reused, only stage→agent dispatch is new |
+| **Orchestrator (Mos)** | Goals, missions, judgment, user/PA interface                                                                  | Context-light; sets intent → re-engages only for decisions                                                                                                                                                |
+
+### Dispatcher = forge (reuse, do not rebuild)
+
+The dispatcher is **not new work**: it is `@mosaicstack/forge`, a fully-implemented
+software-factory pipeline engine (brief → Board-of-Directors review → 3 planning stages →
+coding → review/remediation → testing → deploy). Forge already provides
+`runPipeline`/`resumePipeline`, a brief classifier, and a BOD persona loader, so the fleet
+does **not** re-implement sequencing, gate logic, or brief classification. The only new
+fleet-owned code is a thin **`forge-exec` TaskExecutor adapter** (`ForgeTask` →
+`agent-send.sh` to a named agent) — forge's single missing piece — tracked as a Gitea
+issue and built post-PoC. The Postgres register backs forge's pipeline state (durable
+`resumePipeline`, cross-host) in addition to cross-project missions/tasks/Kanban. The
+north-star **'board' role IS forge's Board-of-Directors** — reused from forge, not a new
+role implementation.
+
+### Docs as projections
+
+`docs/TASKS.md` and `MISSION-MANIFEST.md` are **generated projections** of the DB,
+not hand-maintained. The dispatcher (or a scheduled job) renders Markdown from
+`fleet.*` tables and commits the output. DB is authoritative; docs are for human
+reference.
+
+### Spend
+
+`fleet.spend_ledger` records projected and actual token spend per agent/mission/task
+(ties to issue #622). The dispatcher enforces budget caps before dispatching. Mos reads
+the roll-up via API — no raw DB access, no context-bloating dumps.
+
+### Federation
+
+Cross-host fleet state flows through federated gateway queries (existing
+`federation_peers` / `federation_grants` machinery). This is the existing north-star
+invariant: **control plane rides federation (W1), not a bespoke broker.** No new
+broker introduced.
+
+### Scope
+
+This is Phase 4–5 of this roadmap, materialized. It MUST NOT block the PoC (which
+runs correctly on files + `roster.yaml`). Begin when Phase 2 heartbeat protocol is
+stable and concurrent-agent count makes file coordination the bottleneck.
+
+### Open sub-decision
+
+Dedicated Postgres **instance** vs. dedicated **schema** in the existing instance.
+Recommendation: dedicated schema, existing instance (a migration file, not new infra);
+re-evaluate if isolation or write-volume demands it.
+
 ## Phased roadmap
 
-| Phase                  | Outcome                                                                                                                                      | Status  |
+| Phase                  | Outcome                                                                                                                                                                                                  | Status  |
-| ---------------------- | -------------------------------------------------------------------------------------------------------------------------------------------- | ------- |
+| ---------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------- |
-| 0–1                    | tmux PoC, hardening, published CLI v0.0.34 (#565–#568)                                                                                       | ✅ done |
+| 0–1                    | tmux PoC, hardening, published CLI v0.0.34 (#565–#568)                                                                                                                                                   | ✅ done |
-| **2 — Observability**  | `fleet ps` (host+tenant aware join), heartbeat protocol + dogfood stub answers it, `agent watch` (read-only), `agent send --verify` receipts | ▶ now   |
+| **2 — Observability**  | `fleet ps` (host+tenant aware join), heartbeat protocol + dogfood stub answers it, `agent watch` (read-only), `agent send --verify` receipts                                                             | ▶ now   |
-| 3 — Real runtimes      | claude/codex/pi/opencode answer heartbeat; **hybrid lifecycle** (core always-on: orchestrator+reviewer; ephemeral workers per lane)          | planned |
+| 3 — Real runtimes      | claude/codex/pi/opencode answer heartbeat; **hybrid lifecycle** (core always-on: **orchestrator + enhancer**; ephemeral workers per lane)                                                                | planned |
-| 4 — Unified definition | one agent schema in gateway; `mosaic agent --new` → materialized per-tenant session; uid-tenant provisioning                                 | planned |
+| 4 — Unified definition | one agent schema in gateway; `mosaic agent --new` → materialized per-tenant session; uid-tenant provisioning; **`fleet` schema migration + `forge-exec` TaskExecutor adapter (forge → `agent-send.sh`)** | planned |
-| 5 — Control plane      | federation-backed cross-host × cross-tenant fleet view; **webUI** (surface chosen then) for MVP-X1 parity                                    | planned |
+| 5 — Control plane      | federation-backed cross-host × cross-tenant fleet view; **webUI** (surface chosen then) for MVP-X1 parity; **central register live (spend ledger, docs-as-projections, multi-host Kanban)**              | planned |
 
 ## Decisions of record (2026-06-20, with Jason)
 
@@ -121,6 +289,89 @@ Every artifact, starting Phase 2, MUST:
   runtime-bin on PATH (baked into the pane command) + boot-survival (`enable` + linger),
   which `fleet init` should automate.
 
+## Decisions of record (2026-06-22, with Jason)
+
+- **Two-agent floor:** every fleet has, at minimum, an **orchestrator** and an **enhancer**.
+  The orchestrator is the user's point of contact and composes the fleet; the enhancer runs the
+  continuous-improvement loop (monitor → analyze → remediate → upgrade tools/skills/harness →
+  file Mosaic Stack bug reports) and **does not code or review**.
+- **Role library:** orchestrator, enhancer, coder, code review, security review, research,
+  board (moonshot/contrarian/technical/business/financial), operations — extensible; the
+  orchestrator (advised by the enhancer) adds roles as missions demand.
+- **Orchestrator chat connector:** the orchestrator is reachable over a user-chosen connector
+  (tmux now; Telegram/Discord/Matrix/Slack configurable). Validated live: **"Mos" orchestrator
+  on Discord** via the Claude Code discord channel plugin (w-jarvis).
+- **Session context cap = 200k tokens (GLOBAL to all Claude sessions):** Claude Code sessions are
+  capped at a **max 200k-token context window**. Long-running sessions extended toward 1M tokens
+  have proven **worse in practice** (degraded steering, off-plan divergence); 200k is the standard.
+  **Enforcement split:** the _window_ lives in **`~/.claude/settings.json`** (host-global) as
+  `"autoCompactWindow": 200000` + `"autoCompactEnabled": true`; the _1M-disable_ lives in **launch
+  ENV** (`CLAUDE_CODE_DISABLE_1M_CONTEXT=1`, plus `CLAUDE_CODE_AUTO_COMPACT_WINDOW=200000`) wherever
+  a `[1m]` model can be selected (`mos-claude.service` + the fleet Claude launcher), so every Claude
+  agent is capped at spawn. (settings = window; env = 1M-disable.)
+- **Worker context bound (#8):** workers are kept context-bounded via the **ephemeral-per-lane
+  lifecycle + native compaction**, not via the 200k knob. The explicit `autoCompactWindow` 200k knob
+  **stays Claude-specific** — the _principle_ (bounded context) extends to workers, the _knob_ does not.
+- **Orchestrator delegation discipline:** the orchestrator **delegates all delivery work** to
+  subagents / workflows / ultracode / coder agents and confines its own context to \*\*orchestration
+  - the personal-assistant lane\*\*. Keeping delivery out of the orchestrator's window keeps its
+    context unpolluted and measurably reduces off-plan divergence. The orchestrator coordinates and
+    decides; it does not implement.
+- **Budget governance is fleet doctrine:** token/API-dollar budgeting is a first-class fleet concern
+  (see "Budget & token governance"). OAuth-sub usage-vs-limit feedback is ingested per account, spend
+  is **auto-paced EVEN-SPREAD over remaining time** (rapid/overspend only on explicit authorization),
+  spend is **tracked historically** to self-correct per-task/daily estimates, multi-sub tenants may
+  **auto-route by available usage**, and operators set budgets per provider, per account-to-task
+  mapping, per routing flow, per concurrency level, and as hard API-$ ceilings.
+- **Spend accounting is a Mosaic Stack process mandate:** PRDs, missions, and task decomposition
+  **MUST carry projected + actual token spend**; used locally for pacing and reported as **anonymized
+  telemetry to mosaicstack.dev**. The template standard (#622) and telemetry product (#623) are
+  tracked separately.
+- **Unified identity = "Fleet" (Jason, 2026-06-22):** the product is **Mosaic Fleet** — one unified
+  user-facing identity and CLI surface. **forge** is the Fleet's **internal** delivery/orchestration
+  engine (not a separate product); the control-plane **Postgres register is the Fleet's register**;
+  workers/runtime are the **Fleet substrate**. **"factory" is RETIRED as a product term** — it was
+  only ever the software-factory concept (which forge implements) and the old `mosaic-factory` tmux
+  socket name. The production-isolation socket is now **`mosaic-fleet`** (matches the product brand);
+  the legacy dogfood canary remains on the old `mosaic-factory` socket pending migration. **Code stays
+  layered** (forge + fleet + control-plane as internal layers);
+  only the **identity + CLI surface unify under Fleet.**
+- **Role-based session naming (Jason, 2026-06-22):** agent tmux sessions are named by **role**
+  (`orchestrator`, `enhancer`, `research`, `coder0-0`, …), not by persona. **Persona lives in
+  `SOUL.md`**; the front-end / Discord presents a **friendly alias** (e.g. "Mos" = the orchestrator's
+  alias). The session name is the stable addressing handle; the alias is presentation.
+
+### Control plane & central register
+
+- **Store:** Postgres (existing stack instance, dedicated `fleet` schema via `@mosaicstack/db`). SQLite rejected: (1) it is a local file — structurally incompatible with a multi-host fleet; (2) concurrent multi-agent writes caused repeated corruption in Hermes. "SQLite + access service" rejected as reinventing a DB server badly; "LLM agent gating DB access" rejected as slow, expensive, and a single point of failure.
+- **Access:** gateway API only (`apps/gateway`, `fleet/*` routes). No raw DB credentials in any agent/dispatcher pane — directly mitigates the tmux attack-surface concern.
+- **Dispatcher = forge (reuse, not a new build):** the dispatcher IS `@mosaicstack/forge`'s pipeline engine (`runPipeline`/`resumePipeline` + brief classifier + BOD persona loader), a fully-implemented software-factory pipeline (brief → BOD review → 3 planning stages → coding → review/remediation → testing → deploy). We do **not** design/build a new dispatcher and do **not** re-implement sequencing, gate logic, or brief classification. The only new fleet-owned piece is a thin **`forge-exec` TaskExecutor adapter** (suggested package `packages/forge-exec`) mapping a `ForgeTask` → `agent-send.sh` dispatch to a named fleet agent — forge's single missing piece. It is tracked as a Gitea issue and built **post-PoC** (not now).
+- **Register backs forge:** the Postgres `fleet` register is genuinely new (neither forge nor the fleet has cross-project state). It BACKS forge's pipeline state (durable `resumePipeline`, cross-host) plus cross-project missions/tasks/Kanban.
+- **'board' role = forge BOD:** the north-star role-library 'board' role IS forge's Board-of-Directors — reused, not reinvented.
+- **Orchestration vs. dispatch:** Orchestrator (Mos) sets intent and handles judgment; forge works the mechanical pipeline (sequencing, gates, status transitions, spend ledger). LLM escalation reserved for judgment: mission decomposition, re-planning on failure.
+- **Spend in the register:** `fleet.spend_ledger` tracks projected vs. actual tokens per agent/mission/task; ties to issue #622.
+- **Docs as projections:** `docs/TASKS.md` and `MISSION-MANIFEST.md` become generated exports of the DB, not hand-maintained.
+- **Sub-decision pending:** dedicated schema in existing PG instance (recommended) vs. dedicated PG instance. Revisit if isolation or write-volume demands it.
+
+## Future enhancements (north-star, post-MVP — not on the MVP track)
+
+- **Mosaic Claude Discord Plugin** — a first-party Mosaic Discord connector that properly
+  implements the basic Discord functions **and native Discord threads**. Threads let a user
+  separate conversation topics with the orchestrator (the pattern proven by the Hermes agent).
+  A major enhancement over the current third-party channel plugin; **not required for the MVP**,
+  but a committed north-star target. `ASSUMPTION:` ships as a Mosaic-owned plugin so the fleet
+  controls Discord UX (threads, reactions, attachments, per-thread context) end-to-end.
+- **Matrix on a local homeserver — strategic future transport.** **F4 (in progress) IS the Matrix
+  connector**: an orchestrator chat connector speaking the Matrix client-server API against a
+  self-hosted homeserver (Conduit default, Synapse alt). Matrix is named here as the strategic
+  future transport — peer to tmux/Discord, not superseded by them.
+- **tmux fleet attack-surface hardening.** Many always-on tmux sessions are an attack surface;
+  `tmux send-keys` / socket access could enable malicious action against agents directly.
+  Mitigations to build toward: socket ownership/perms, per-tenant socket isolation (already an
+  invariant), authenticated `agent-send`, and an audit of who can write to any pane. **Post-MVP
+  unless a P0 surfaces.** The control-plane register reinforces this (gateway-API access = no raw
+  DB creds in panes). A not-started risk-assessment + mitigation-plan task rides the Fleet `TASKS.md`.
+
 ## Assumptions (veto-able)
 
 - `ASSUMPTION:` first-class runtimes = claude, codex, pi, opencode; a "role" (analyst,
@@ -131,3 +382,30 @@ Every artifact, starting Phase 2, MUST:
 - `ASSUMPTION:` Fleet is workstream **W-FLEET** under `mvp-20260312`; a rollup row in
   `docs/TASKS.md` and a workstream declaration in `MISSION-MANIFEST.md` are proposed to
   the MVP orchestrator, not written by this workstream.
+- `ASSUMPTION:` OAuth-subscription runtimes (Claude sub, Codex sub) expose a machine-readable
+  current-usage-vs-limit signal the fleet can poll/ingest; if a provider exposes no such signal,
+  that provider's accounts fall back to API-style hard-ceiling budgeting only (no auto-pacing).
+- `ASSUMPTION:` budget policy lives at the orchestrator + routing layer and is surfaced through the
+  same CLI→TUI→webUI parity (MVP-X1) as the rest of fleet state — not a separate budgeting daemon.
+- `ASSUMPTION:` the 200k session cap is enforced by Claude Code settings/env composition (model
+  variant + `autoCompactWindow`), not by a Mosaic wrapper; a wrapper is the fallback only if the
+  harness later removes those knobs.
+- `ASSUMPTION:` The central register (Postgres `fleet` schema + gateway API + forge as dispatcher) is
+  the Phase 4–5 control plane, begun after Phase 2 observability is proven. It is a dedicated
+  **W-FLEET** sub-workstream entry, not a separate mission. The dispatcher is `@mosaicstack/forge`
+  (reused, not a new daemon); the only new fleet-owned code is the thin **`forge-exec` TaskExecutor
+  adapter** (suggested package `packages/forge-exec`, `ForgeTask` → `agent-send.sh`), tracked as a
+  Gitea issue and built post-PoC.
+
+---
+
+> **Release procedure (drift re-capture, 2026-06-22):** `mosaic update` only propagates new fleet
+> commands when the **CLI version is bumped** — without a version bump, fleet command changes never
+> reach installed hosts. The release/version-bump procedure (bump → publish → `mosaic update`
+> [→ `--relaunch`]) must be documented so fleet changes actually land. (Also feeds the budgeting
+> workstream.)
+>
+> **Tracked separately (not in scope for this doc PR):** **#622** PRD/mission/task projected+actual
+> spend template standard · **#623** anonymized spend telemetry → mosaicstack.dev (product) ·
+> **#625** `tenant_id` roster-schema field (multi-tenant; invariant #1 home) · **#628** `forge-exec`
+> TaskExecutor adapter (post-PoC). This PR records **doctrine only** — no implementation.

docs/guides/fleet-local-canary.md

@@ -1,7 +1,7 @@
 # Local Fleet Canary
 
 The local fleet canary runs a small tmux-backed Mosaic agent fleet on an
-isolated tmux socket. The default socket is `mosaic-factory`; the commands do
+isolated tmux socket. The default socket is `mosaic-fleet`; the commands do
 not use or stop the default tmux server.
 
 ## Files
@@ -67,7 +67,7 @@ mosaic agent tail canary-pi -n 80
 
 These commands read the roster and target the configured tmux socket. The
 generated systemd agent services use `start-agent-session.sh`; message delivery
-uses the tmux send tools with `-L mosaic-factory`.
+uses the tmux send tools with `-L mosaic-fleet`.
 
 `mosaic agent send` is operator-origin traffic unless a caller explicitly says
 otherwise. The CLI always passes a deterministic source label to
@@ -82,7 +82,7 @@ impersonating a known handoff lane. The lower-level inter-agent wrapper
 Use these checks before expanding the roster:
 
 ```bash
-tmux -L mosaic-factory ls
+tmux -L mosaic-fleet ls
 tmux ls
 mosaic fleet verify
 systemctl --user status mosaic-tmux-holder.service
@@ -90,7 +90,7 @@ systemctl --user status mosaic-tmux-holder.service
 
 Expected results:
 
-- `tmux -L mosaic-factory ls` shows `_holder` and roster agent sessions.
+- `tmux -L mosaic-fleet ls` shows `_holder` and roster agent sessions.
 - `tmux ls` shows only the default tmux server sessions and is not changed by
   fleet start/stop operations.
 - `mosaic fleet verify` checks exact session targets on the isolated socket.
@@ -108,7 +108,7 @@ Run this checklist before cutting or dogfooding a fleet release:
   repeated `start` against the named socket; verify the default tmux server is
   unchanged.
 - Liveness verification: run `mosaic fleet verify` and confirm roster sessions
-  with `tmux -L mosaic-factory ls` or exact `has-session` checks.
+  with `tmux -L mosaic-fleet ls` or exact `has-session` checks.
 - Package dry-run: run `npm pack --dry-run --json` from `packages/mosaic` and
   confirm `framework/fleet`, `framework/systemd/user`,
   `framework/tools/fleet`, and `framework/tools/tmux` assets are included.
@@ -140,5 +140,5 @@ This rollback leaves the default tmux server untouched. If a canary session is
 still present after service stop, remove only the isolated socket server:
 
 ```bash
-tmux -L mosaic-factory kill-server
+tmux -L mosaic-fleet kill-server
 ```

docs/scratchpads/2026-06-20-fleet-cli-local-canary.md

@@ -17,7 +17,7 @@ Implement enough product surface to use the fleet locally:
 - roster schema and examples
 - local canary docs and rollback instructions
 - tests for CLI behavior where practical
-- canary verification on named tmux socket `mosaic-factory`
+- canary verification on named tmux socket `mosaic-fleet`
 
 ## Non-goals
 
@@ -30,7 +30,7 @@ Implement enough product surface to use the fleet locally:
 
 - CLI can initialize a minimal roster outside product defaults.
 - CLI can install user systemd units and fleet helper scripts to a configurable Mosaic home.
-- CLI can start/stop/status/verify a canary fleet using `mosaic-factory`.
+- CLI can start/stop/status/verify a canary fleet using `mosaic-fleet`.
 - `mosaic agent send` uses existing named-socket/exact-target tmux tooling.
 - `mosaic agent reset` targets only the named agent session on the named socket.
 - Verification proves default tmux sessions remain untouched.

docs/scratchpads/631-reseed-preserves-fleet.md

@@ -0,0 +1,32 @@
+# #631 — re-seed must preserve user fleet data (CRITICAL data-loss)
+
+- **Issue:** #631 · **Branch:** `fix/631-reseed-preserves-fleet-data`
+
+## Root cause
+
+`mosaic update` auto-runs `install.sh` keep-mode sync (#610). install.sh's rsync `--delete` (keep mode)
+honored PRESERVE_PATHS, but `fleet/` wasn't listed → the sync WIPED `~/.config/mosaic/fleet/roster.yaml`
+(+ run/, agents/). Any user running `mosaic update` lost their roster. (overwrite mode wipes by design;
+the live loss was keep mode.)
+
+## Fix (PRIMARY)
+
+- install.sh PRESERVE_PATHS += `fleet/*.yaml`, `fleet/agents`, `fleet/run` — the framework still SEEDS
+  fleet/examples + fleet/roles + fleet/roster.schema.json (synced), but user files survive.
+- Made the cp-fallback (no-rsync) GLOB-AWARE so `fleet/*.yaml` preserves every user roster there too;
+  fixed the restore to re-glob per-pattern (so only the user file is restored, not the whole fleet/ dir).
+- file-adapter.ts (TS installer): mirrored the preserve list for parity. (TS syncDirectory is copy-only,
+  never --delete, so it never had the bug — belt-and-suspenders + parity.)
+
+## Fix (SECONDARY)
+
+- `refreshActiveFleetUnits()` (update-checker.ts): the re-seed updates ~/.config/mosaic/systemd/user but
+  systemd runs ~/.config/systemd/user, so unit fixes (#627) didn't take effect. After the re-seed,
+  `mosaic update` now copies the fresh mosaic-\*.service → the active dir + daemon-reload (best-effort,
+  only when a fleet is already installed). Wired into the cli.ts update flow.
+
+## Verification
+
+- bash F6 fixture (6 checks: roster/custom-yaml/agents/run survive + examples refreshed + schema seeded);
+  20/20 migration matrix green. TS file-adapter test (roster/run/agents survive keep sync). 2 unit tests
+  for refreshActiveFleetUnits. tsc/eslint/prettier/sanitize clean.

docs/scratchpads/633-comms-block-runbook.md

@@ -0,0 +1,54 @@
+# #633 — comms-block emitter + FLEET-LAUNCH runbook
+
+Branch: `feat/633-comms-block-runbook` (off `bf2a6745`, post-#632 merge)
+Issue: #633 · Follow-up filed: #636 (PATH B)
+
+## Goal
+
+PATH A of the orchestrator-launch fix: give every launch path the Fleet-Comms onboarding, and
+document the canonical roster-driven launcher so the orchestrator stops being a bespoke snowflake.
+
+## Deliverables
+
+1. **`mosaic fleet comms-block <role> [--host <h>]`** — explicit-arg, comms-block-only emitter.
+   - Backed by new `resolveCommsBlock(mosaicHome, role, fleetHost?)` in `fleet/comms-onboarding.ts`
+     returning `{ ok, output, error }`.
+   - Unlike `readFleetCommsBlock` (returns `''` on any miss so `composeContract` can no-op silently
+     during launch), the emitter **fails loud**: unknown role / missing roster → `ok:false` → CLI
+     prints to stderr + sets `process.exitCode = 1`. A typo is never a silent no-op.
+   - Distinct from `mosaic compose-contract <runtime>` (whole prompt, env-coupled via
+     `MOSAIC_AGENT_NAME`); comms-block is the targeted, explicit-arg, comms-only view.
+2. **`docs/fleet/FLEET-LAUNCH.md`** — worker path + orchestrator `.env` fold + 3 launch gotchas +
+   #632 preserve note + North-Star 4-field arc.
+
+## Key findings (drove the design)
+
+- `mosaic yolo claude` **already** forwards `--channels`/`--permission-mode` to the binary
+  (`launch.ts` claude case `cliArgs.push(...args)`) AND injects the comms block via
+  `composeContract` → `readFleetCommsBlock(home, env.MOSAIC_AGENT_NAME)`. So no `launch.ts` change
+  was needed — PATH A is `.env` + doc only.
+- `start-agent-session.sh` line ~41 `[ -z "$MOSAIC_AGENT_COMMAND" ]` short-circuits the line-44
+  default, so an `.env` `MOSAIC_AGENT_COMMAND` override bypasses the hardcoded `yolo` entirely — the
+  yolo-conditional is therefore a PATH B (default-path) concern, not PATH A.
+- `generateAgentEnv` (`fleet.ts` ~202-207) emits NAME/RUNTIME/MODEL but **not** `MOSAIC_AGENT_COMMAND`
+  — the seam PATH B (#636) closes.
+
+## A → B → webUI arc (North Star)
+
+- A = `.env` `MOSAIC_AGENT_COMMAND` hatch (manual, ships now, #632-safe).
+- B (#636) = roster-native launch-config: harness ✅ + model ✅ already there; add **yolo** (line-44
+  conditional `MOSAIC_AGENT_YOLO`) + **command/channels** (`generateAgentEnv` emission).
+- webUI binds dropdowns/toggles to those four roster fields. One launcher, no new launch path.
+
+## Results
+
+- TDD: spec first (`comms-onboarding.spec.ts`, 6 new `resolveCommsBlock` cases) → red → implement → green.
+- `fleet.spec.ts` subcommand-list assertion extended with `comms-block`.
+- 177 fleet+comms tests green; typecheck clean; eslint clean; prettier clean.
+
+## Risks / notes
+
+- Pre-existing local-only failure `uninstall.spec.ts > removeFramework > handles missing mosaicHome
+gracefully` (EACCES on `/nonexistent` as non-root) — unrelated to #633, passes in CI as root.
+- Did NOT run `mosaic update` / anything auto-reseed: installed CLI still 0.0.40 (roster-wipe live
+  until mos-claude-0 ships 0.0.41). All work is in-repo + vitest, never touches the live mosaic home.

docs/scratchpads/f4-matrix-connector.md

@@ -0,0 +1,30 @@
+# F4 — Orchestrator chat connector + Matrix (#616)
+
+- **Issue:** #616 · **Branch:** `feat/f4-matrix-connector` (off main; independent of #615) · **Doctrine:** north-star #613.
+
+## Phase 1 (this PR) — abstraction + scaffold
+
+- `src/fleet/connectors/types.ts`: `OrchestratorConnector` (send/subscribe/health) + message/config types; thread-aware via optional `threadId`; `DEFAULT_CONNECTOR_KIND=tmux`.
+- `src/fleet/connectors/registry.ts`: extensible factory registry; `resolveConnectorKind` (defaults tmux, back-compat); `createConnector` throws `ConnectorNotImplementedError` until Phase 2 registers factories.
+- `roster.schema.json`: optional `connector` block (tmux|discord|matrix; matrix homeserver/user/room; secrets via env, never roster).
+- Design doc `docs/fleet/f4-matrix-connector.md`: interface, config, Matrix CS-API mapping, Conduit-default infra, phasing.
+- **No fleet.ts changes** → self-contained, zero conflict with stacked #615.
+
+## Verification
+
+- 7 connector tests green; tsc/eslint/prettier/sanitize clean; schema valid JSON.
+
+## Phase 2+ (follow-ups, in the doc)
+
+Matrix CS-API client (fetch send/sync/health) + factory; init/configure connector-selection UX + roster-parse wiring; systemd launch wiring; Conduit deploy guide; first-party Mosaic Discord (threads) as a connector.
+
+## Phase 2a (feat/f4-matrix-client, stacked on #617) — Matrix CS-API client
+
+- `src/fleet/connectors/matrix.ts`: `MatrixConnector implements OrchestratorConnector` over the Matrix
+  client-server API (injectable fetch, no SDK). `send` → PUT m.room.message (thread-aware); `subscribe`
+  → /sync long-poll loop using the pure `parseSyncResponse`; `health` → /versions + /whoami.
+  `registerMatrixConnector(env)` registers the factory (token from MATRIX_ACCESS_TOKEN, never roster).
+- Pure helpers `buildMessageBody` + `parseSyncResponse` make send/receive unit-testable.
+- 13 Matrix tests + 7 registry = 20 connector tests green; tsc/eslint/prettier clean.
+- Remaining Phase 2: init/configure connector-selection UX + roster-parse wiring (touches fleet.ts —
+  after #615); systemd launch wiring; Conduit deploy guide.

docs/scratchpads/fleet-comms-onboarding.md

@@ -0,0 +1,31 @@
+# Fleet onboarding-injection — comms cheat-sheet + peer roster (#620)
+
+- **Issue:** #620 · **Branch:** `feat/fleet-comms-onboarding` (off main). Root cause of Mos's failed first send.
+
+## What
+
+Inject a `# Fleet Comms` block into each spawned fleet agent's system prompt (via composeContract — the
+runtime-agnostic path every `mosaic yolo <runtime>` agent hits), so it boots knowing how to reach peers.
+
+- `src/fleet/comms-onboarding.ts` (standalone, no fleet.ts coupling):
+  - `parseRosterAgents` (name/class/host/ssh, lenient), `renderPeerReach` (same-host `-s` vs cross-host
+    `-H <ssh> -s`), `buildFleetCommsBlock` (self [host:session] identity + agent-send path + peer table +
+    FLIP-to-reply + `agent send --verify`=ACCEPTED), `readFleetCommsBlock` (reads roster.yaml; '' if not a member).
+  - `composeContract` appends it only when MOSAIC_AGENT_NAME is set + the agent is in the roster.
+- `roster.schema.json`: optional per-agent `host` + `ssh` (cross-host addresses; manual = pre-federation
+  stopgap, federation/W1 auto-discovers later).
+
+## Acceptance criteria (Mos) — all covered
+
+1. own [host:session] + agent-send path + peer roster ✓
+2. cross-host correctness: local→`-s` (no -H); remote→`-H <ssh> -s` ✓ (concrete coder0-0@dragon-lin)
+3. FLIP-the-preamble reply rule ✓
+4. `agent send --verify` = ACCEPTED ✓
+5. no `-L` (default socket); matches live tooling ✓
+
+## Verification
+
+- 10 onboarding unit tests (parse, render local/remote/fallback/equal-host, build, situational read) +
+  2 composeContract situational tests (injects for fleet agent w/ correct cross-host addr; no-op when
+  MOSAIC_AGENT_NAME unset). tsc/eslint/prettier/sanitize clean.
+- Post-merge validation: Mos spawns a real w-jarvis agent → first-try reach to coder0-0@dragon-lin + a local peer.

docs/scratchpads/fleet-observability-phase2.md

@@ -31,7 +31,7 @@ with a second agent on `dragon-lin`.
 ## Environment facts (verified 2026-06-20)
 
 - Fleet is live on `W-jarvis` (uid 1000, `jarvis`, `Linger=yes`) on tmux socket
-  `mosaic-factory`: `_holder`, `canary-pi`, `dogfood-coder`, `dogfood-orchestrator`,
+  `mosaic-fleet`: `_holder`, `canary-pi`, `dogfood-coder`, `dogfood-orchestrator`,
   `dogfood-reviewer`. All panes run `~/.config/mosaic/fleet/dogfood-agent.py` (stub),
   including `canary-pi` (roster says runtime=pi → **drift**).
 - Holder + `mosaic-agent@*` units are `active (exited)` but `UnitFileState=disabled`
@@ -56,7 +56,7 @@ with a second agent on `dragon-lin`.
   with dragon-lin coder, commit docs, begin Phase-2 delivery (heartbeat + `fleet ps`).
 - 2026-06-20 (session 2): Built Phase-2 CLI via worker (commit ab47831): `fleet ps`,
   `agent watch`, `agent send --verify`, 62 tests. LIVE-verified `fleet ps` on
-  mosaic-factory — correctly flagged canary-pi DRIFT + BOOT-ENABLE, tenant_id+host in JSON.
+  mosaic-fleet — correctly flagged canary-pi DRIFT + BOOT-ENABLE, tenant_id+host in JSON.
   Heartbeat responder added to dogfood-agent.py (FLEET-OBS-002) — `fleet ps` HB now
   `healthy` for all 4 agents.
 - Coordination: dual-engine-reviewed (Claude+Codex) and merged framework PRs #572

docs/scratchpads/fleet-standup-fixes.md

@@ -0,0 +1,28 @@
+# Fleet stand-up fixes — model_hint→--model + socket-default trap (#626)
+
+- **Issue:** #626 · **Branch:** `feat/fleet-standup-fixes` (off main). PoC-blocking, before doctrine doc.
+
+## FIX 1 — model_hint consumed
+
+- generateAgentEnv emits `MOSAIC_AGENT_MODEL=<modelHint>` (bare empty when unset).
+- start-agent-session.sh default command → `mosaic yolo $RUNTIME ${MOSAIC_AGENT_MODEL:+--model $MOSAIC_AGENT_MODEL}`.
+  → pi workers launch with `--model openai-codex/gpt-5.5:high`.
+
+## FIX 2 — socket default trap (absent ⇒ literal default socket, no -L everywhere)
+
+- THE TRAP (3 sites): parseRosterText fallback was DEFAULT_SOCKET_NAME; systemd unit had
+  `Environment=MOSAIC_TMUX_SOCKET=mosaic-fleet` + `ExecStop ${…:-mosaic-fleet}`; start-agent-session
+  defaulted `:-mosaic-fleet`. All fixed → absent socket = '' = default tmux socket (no -L).
+- `socketArgs(name)` helper → `name ? ['-L', name] : []`; replaced all ~15 -L render sites in fleet.ts.
+- shellEnvValue('') now emits a **bare** `VAR=` (not `''`) — unambiguous empty in systemd EnvironmentFile
+  (a quoted '' could become a literal socket named "''").
+- start-agent-session.sh: `_tmux` wrapper passes -L only when socket set; mosaic-agent@.service: dropped the
+  socket default + conditional ExecStop. So spawn == observe == onboarding cheat-sheet.
+- CONTAINMENT: all 6 shipped presets set socket_name: mosaic-fleet explicitly → unaffected; only
+  socket-less rosters (the PoC) get default-socket behavior. DEFAULT_SOCKET_NAME exported for explicit use.
+
+## Verification
+
+- 158 fleet + 201 fleet-adjacent tests green; new: socketArgs none/named, model_hint→env, explicit-socket
+  renders -L, socket-less env bare. tsc/eslint/prettier/sanitize clean. Shell bash -n + end-to-end sim
+  (socket-less→no -L, model→--model).

docs/scratchpads/north-star-doctrine.md

@@ -0,0 +1,19 @@
+# north-star doctrine consolidation (#620-adjacent doc PR)
+
+- **Branch:** `feat/north-star-doctrine` (off main). Source: Mos's consolidated handoff + 2 drafts (budgeting/200k/delegation + control-plane). ONE conflict-free PR per the merge-map.
+
+## Applied (merge-map, in order)
+
+1. Stack table: +2 rows (Central register, Budget/spend governance) after Control plane + PoC-socket-hygiene note.
+2. `## Budget & token governance` after Invariants (even-spread pacing [Jason override], hard-cap ladder, multi-sub auto-routing, historical learning, #558 CLI UX) + TTY OPS INVARIANT note.
+3. `## Control plane & central register` after Observation model (Postgres fleet schema, gateway-API access, dispatcher = forge pipeline engine + forge-exec adapter [NOT a daemon], register backs forge, board = forge BOD).
+4. Phased roadmap Phase 4/5 annotated (fleet schema migration + forge-exec; central register live).
+5. Decisions of record (2026-06-22): doctrine §1(c) bullets (200k cap, worker bound #8, delegation, budget, spend mandate, unified identity Fleet, role-based session naming) + control-plane 6c `### Control plane & central register` subgroup.
+6. Future enhancements: Matrix-future-transport (#10, F4 IS Matrix) + tmux security hardening (§5).
+7. Assumptions: doctrine §1(d) (3) + control-plane 6e (1) + release-procedure note + tracked-separately note.
+
+## Conflict checklist: all ✓
+
+1 Decisions-2026-06-22; order Invariants→Budget→Observation→Control plane→Roadmap; 2 stack rows; even-spread (no opportunistic/HOLD); control-plane UNHELD; forge-exec = tracked #628 post-PoC; §7 drift re-captures all present (#8/#10/#558/TTY/release).
+
+## Out of scope (cited in doc + PR): #622 (spend template std), #623 (telemetry product), #625 (tenant_id schema), #628 (forge-exec adapter). Doctrine only — no implementation.

packages/mosaic/framework/fleet/README.md

@@ -8,7 +8,7 @@ package, normally at:
 ~/.config/mosaic/fleet/roster.yaml
 ```
 
-The default tmux socket is `mosaic-factory` so fleet commands do not touch the
+The default tmux socket is `mosaic-fleet` so fleet commands do not touch the
 default tmux server.
 
 ## Examples

packages/mosaic/framework/fleet/examples/coding.yaml

@@ -1,7 +1,7 @@
 version: 1
 transport: tmux
 tmux:
-  socket_name: mosaic-factory
+  socket_name: mosaic-fleet
   holder_session: _holder
 defaults:
   working_directory: ~

packages/mosaic/framework/fleet/examples/general.yaml

@@ -1,7 +1,7 @@
 version: 1
 transport: tmux
 tmux:
-  socket_name: mosaic-factory
+  socket_name: mosaic-fleet
   holder_session: _holder
 defaults:
   working_directory: ~

packages/mosaic/framework/fleet/examples/hybrid.yaml

@@ -1,7 +1,7 @@
 version: 1
 transport: tmux
 tmux:
-  socket_name: mosaic-factory
+  socket_name: mosaic-fleet
   holder_session: _holder
 defaults:
   working_directory: ~

packages/mosaic/framework/fleet/examples/local-canary.yaml

@@ -1,7 +1,7 @@
 version: 1
 transport: tmux
 tmux:
-  socket_name: mosaic-factory
+  socket_name: mosaic-fleet
   holder_session: _holder
 defaults:
   working_directory: ~/src

packages/mosaic/framework/fleet/examples/minimal.yaml

@@ -1,7 +1,7 @@
 version: 1
 transport: tmux
 tmux:
-  socket_name: mosaic-factory
+  socket_name: mosaic-fleet
   holder_session: _holder
 defaults:
   working_directory: ~/src

packages/mosaic/framework/fleet/examples/research.yaml

@@ -1,7 +1,7 @@
 version: 1
 transport: tmux
 tmux:
-  socket_name: mosaic-factory
+  socket_name: mosaic-fleet
   holder_session: _holder
 defaults:
   working_directory: ~

packages/mosaic/framework/fleet/roster.schema.json

@@ -18,11 +18,11 @@
       "properties": {
         "socket_name": {
           "type": "string",
-          "default": "mosaic-factory"
+          "default": "mosaic-fleet"
         },
         "socketName": {
           "type": "string",
-          "default": "mosaic-factory"
+          "default": "mosaic-fleet"
         },
         "holder_session": {
           "type": "string",
@@ -81,6 +81,18 @@
           "class": {
             "type": "string"
           },
+          "host": {
+            "description": "Host the agent runs on (hostname or IP). Absent = the fleet host. Used by onboarding-injection to render cross-host comms addresses. Manual cross-host listing is a pre-federation stopgap; federation (W1) auto-discovers later.",
+            "type": "string"
+          },
+          "ssh": {
+            "description": "SSH target (user@host) for a cross-host peer, so onboarding renders the `agent-send.sh -H <user@host>` form. Optional; only needed for agents on a different host than the fleet.",
+            "type": "string"
+          },
+          "socket": {
+            "description": "tmux socket the agent's session runs on. Onboarding renders `-L <socket>` when set; absent = the default socket (no `-L`). Must match the LIVE socket, not blindly inherit the roster's tmux.socket_name.",
+            "type": "string"
+          },
           "working_directory": {
             "type": "string"
           },
@@ -113,6 +125,35 @@
           }
         }
       }
+    },
+    "connector": {
+      "description": "Orchestrator chat connector (F4). Optional — absent means tmux (back-compat). Secrets (access/bot tokens) come from the environment, never this file.",
+      "type": "object",
+      "additionalProperties": false,
+      "required": ["kind"],
+      "properties": {
+        "kind": {
+          "enum": ["tmux", "discord", "matrix"]
+        },
+        "matrix": {
+          "type": "object",
+          "additionalProperties": false,
+          "required": ["homeserver_url", "user_id", "room_id"],
+          "properties": {
+            "homeserver_url": { "type": "string" },
+            "user_id": { "type": "string" },
+            "room_id": { "type": "string" }
+          }
+        },
+        "discord": {
+          "type": "object",
+          "additionalProperties": false,
+          "required": ["channel_id"],
+          "properties": {
+            "channel_id": { "type": "string" }
+          }
+        }
+      }
     }
   }
 }

packages/mosaic/framework/install.sh

@@ -23,7 +23,15 @@ INSTALL_MODE="${MOSAIC_INSTALL_MODE:-prompt}"
 # entries (CONSTITUTION/AGENTS/STANDARDS) ARE re-applied afterward by
 # reconcile_framework_files (overwrite + backup-once); the rest stay user-owned.
 # User-created content in these paths survives rsync --delete.
-PRESERVE_PATHS=("CONSTITUTION.md" "AGENTS.md" "SOUL.md" "USER.md" "TOOLS.md" "STANDARDS.md" "memory" "sources" "credentials")
+#
+# fleet/* — the framework SEEDS only fleet/examples, fleet/roles, and
+# fleet/roster.schema.json (synced normally). The user's own fleet files MUST
+# survive `mosaic update` (which runs this sync automatically): the active
+# roster (`fleet/roster.yaml` + any other `fleet/*.yaml`), per-agent env
+# (`fleet/agents/`), and heartbeat run dir (`fleet/run/`). Without these, an
+# update wipes the operator's fleet. Glob entries are honored by both the rsync
+# path (`--exclude`) and the glob-aware cp fallback below.
+PRESERVE_PATHS=("CONSTITUTION.md" "AGENTS.md" "SOUL.md" "USER.md" "TOOLS.md" "STANDARDS.md" "memory" "sources" "credentials" "fleet/*.yaml" "fleet/agents" "fleet/run")
 
 # Framework-owned contract files: re-copied from defaults/ on every upgrade (the
 # user must not edit them; a divergent copy is backed up once before overwrite).
@@ -179,15 +187,23 @@ sync_framework() {
     return
   fi
 
-  # Fallback: cp-based sync
+  # Fallback: cp-based sync. Glob-aware so entries like "fleet/*.yaml" preserve
+  # every matching user file (parity with the rsync --exclude path above).
   local preserve_tmp=""
   if [[ "$INSTALL_MODE" == "keep" ]]; then
     preserve_tmp="$(mktemp -d "${TMPDIR:-/tmp}/mosaic-preserve-XXXXXX")"
+    local match rel
     for path in "${PRESERVE_PATHS[@]}"; do
-      if [[ -e "$TARGET_DIR/$path" ]]; then
+      # Unquoted $path lets the glob expand against TARGET_DIR; nullglob makes a
-        mkdir -p "$preserve_tmp/$(dirname "$path")"
+      # non-matching pattern vanish instead of staying literal.
-        cp -R "$TARGET_DIR/$path" "$preserve_tmp/$path"
+      shopt -s nullglob
-      fi
+      for match in "$TARGET_DIR/"$path; do
+        [[ -e "$match" ]] || continue
+        rel="${match#"$TARGET_DIR/"}"
+        mkdir -p "$preserve_tmp/$(dirname "$rel")"
+        cp -R "$match" "$preserve_tmp/$rel"
+      done
+      shopt -u nullglob
     done
   fi
 
@@ -196,12 +212,19 @@ sync_framework() {
   rm -rf "$TARGET_DIR/.git"
 
   if [[ -n "$preserve_tmp" ]]; then
+    # Restore by re-globbing the SAME patterns against preserve_tmp, so each
+    # preserved item is restored at its own relative path (e.g. only
+    # fleet/roster.yaml is replaced — the freshly-synced fleet/examples stays).
     for path in "${PRESERVE_PATHS[@]}"; do
-      if [[ -e "$preserve_tmp/$path" ]]; then
+      shopt -s nullglob
-        rm -rf "$TARGET_DIR/$path"
+      for match in "$preserve_tmp/"$path; do
-        mkdir -p "$TARGET_DIR/$(dirname "$path")"
+        [[ -e "$match" ]] || continue
-        cp -R "$preserve_tmp/$path" "$TARGET_DIR/$path"
+        rel="${match#"$preserve_tmp/"}"
-      fi
+        rm -rf "$TARGET_DIR/$rel"
+        mkdir -p "$TARGET_DIR/$(dirname "$rel")"
+        cp -R "$match" "$TARGET_DIR/$rel"
+      done
+      shopt -u nullglob
     done
     rm -rf "$preserve_tmp"
   fi

packages/mosaic/framework/systemd/user/README.md

@@ -33,7 +33,7 @@ Per-agent overrides live outside the package in:
 Example:
 
 ```dotenv
-MOSAIC_TMUX_SOCKET=mosaic-factory
+MOSAIC_TMUX_SOCKET=mosaic-fleet
 MOSAIC_AGENT_RUNTIME=claude
 MOSAIC_AGENT_WORKDIR=$HOME/src/your-project
 # Optional escape hatch for PoC/canary agents:
@@ -50,8 +50,8 @@ chmod +x ~/.config/mosaic/tools/fleet/start-agent-session.sh
 systemctl --user daemon-reload
 systemctl --user start mosaic-tmux-holder.service
 systemctl --user start mosaic-agent@canary.service
-tmux -L mosaic-factory ls
+tmux -L mosaic-fleet ls
 ```
 
-Do not use `tmux kill-server` without `-L mosaic-factory`; this pattern is meant
+Do not use `tmux kill-server` without `-L mosaic-fleet`; this pattern is meant
 to avoid disturbing the user's default tmux server.

packages/mosaic/framework/systemd/user/mosaic-agent@.service

@@ -8,13 +8,15 @@ PartOf=mosaic-tmux-holder.service
 [Service]
 Type=oneshot
 RemainAfterExit=yes
-Environment=MOSAIC_TMUX_SOCKET=mosaic-factory
+# No default MOSAIC_TMUX_SOCKET: an absent roster socket means the literal
+# default tmux socket (no -L). The per-agent .env sets it when the roster names
+# one; otherwise it stays unset and start-agent-session.sh uses the default socket.
 Environment=MOSAIC_AGENT_NAME=%i
 Environment=MOSAIC_AGENT_RUNTIME=pi
 Environment=MOSAIC_AGENT_WORKDIR=%h
 EnvironmentFile=-%h/.config/mosaic/fleet/agents/%i.env
 ExecStart=/bin/bash %h/.config/mosaic/tools/fleet/start-agent-session.sh %i
-ExecStop=-/bin/bash -lc 'tmux -L "${MOSAIC_TMUX_SOCKET:-mosaic-factory}" kill-session -t "=%i"'
+ExecStop=-/bin/bash -lc 'if [ -n "${MOSAIC_TMUX_SOCKET:-}" ]; then tmux -L "$MOSAIC_TMUX_SOCKET" kill-session -t "=%i"; else tmux kill-session -t "=%i"; fi'
 
 [Install]
 WantedBy=default.target

packages/mosaic/framework/systemd/user/mosaic-tmux-holder.service

@@ -6,7 +6,7 @@ After=default.target
 [Service]
 Type=oneshot
 RemainAfterExit=yes
-Environment=MOSAIC_TMUX_SOCKET=mosaic-factory
+Environment=MOSAIC_TMUX_SOCKET=mosaic-fleet
 Environment=MOSAIC_TMUX_HOLDER=_holder
 ExecStart=/bin/bash -lc 'tmux -L "$MOSAIC_TMUX_SOCKET" has-session -t "=${MOSAIC_TMUX_HOLDER}:0.0" 2>/dev/null || tmux -L "$MOSAIC_TMUX_SOCKET" new-session -d -s "$MOSAIC_TMUX_HOLDER" "while true; do sleep 3600; done"'
 ExecStop=-/bin/bash -lc 'tmux -L "$MOSAIC_TMUX_SOCKET" kill-server'

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

@@ -2,8 +2,12 @@
 set -euo pipefail
 
 AGENT_NAME=${1:-${MOSAIC_AGENT_NAME:-}}
-MOSAIC_TMUX_SOCKET=${MOSAIC_TMUX_SOCKET:-mosaic-factory}
+# Absent socket ⇒ the LITERAL default tmux socket (no -L). The roster's
+# socket_name is honored when set; absent never silently becomes mosaic-fleet
+# (spawn stays consistent with the onboarding cheat-sheet + fleet ps observe).
+MOSAIC_TMUX_SOCKET=${MOSAIC_TMUX_SOCKET:-}
 MOSAIC_AGENT_RUNTIME=${MOSAIC_AGENT_RUNTIME:-pi}
+MOSAIC_AGENT_MODEL=${MOSAIC_AGENT_MODEL:-}
 MOSAIC_AGENT_WORKDIR=${MOSAIC_AGENT_WORKDIR:-$HOME}
 MOSAIC_AGENT_COMMAND=${MOSAIC_AGENT_COMMAND:-}
 MOSAIC_HEARTBEAT_RUN_DIR=${MOSAIC_HEARTBEAT_RUN_DIR:-${MOSAIC_HOME:-$HOME/.config/mosaic}/fleet/run}
@@ -19,13 +23,25 @@ if ! command -v tmux >/dev/null 2>&1; then
   exit 69
 fi
 
-if tmux -L "$MOSAIC_TMUX_SOCKET" has-session -t "=${AGENT_NAME}:0.0" 2>/dev/null; then
+# tmux wrapper: pass -L only when a socket is configured. An absent/empty socket
-  echo "Mosaic agent session already running: $AGENT_NAME on socket $MOSAIC_TMUX_SOCKET"
+# means the default tmux socket (no -L), keeping spawn == observe == cheat-sheet.
+_tmux() {
+  if [ -n "$MOSAIC_TMUX_SOCKET" ]; then
+    tmux -L "$MOSAIC_TMUX_SOCKET" "$@"
+  else
+    tmux "$@"
+  fi
+}
+
+if _tmux has-session -t "=${AGENT_NAME}:0.0" 2>/dev/null; then
+  echo "Mosaic agent session already running: $AGENT_NAME on socket ${MOSAIC_TMUX_SOCKET:-(default)}"
   exit 0
 fi
 
 if [ -z "$MOSAIC_AGENT_COMMAND" ]; then
-  MOSAIC_AGENT_COMMAND="mosaic yolo $MOSAIC_AGENT_RUNTIME"
+  # Map the roster's per-agent model_hint to `--model` so workers launch on the
+  # configured model (e.g. pi on openai-codex/gpt-5.5:high). Omitted when unset.
+  MOSAIC_AGENT_COMMAND="mosaic yolo $MOSAIC_AGENT_RUNTIME${MOSAIC_AGENT_MODEL:+ --model $MOSAIC_AGENT_MODEL}"
 fi
 
 # ── Derive a runtime-bin PATH prefix ─────────────────────────────────────────
@@ -107,13 +123,13 @@ fi
 mkdir -p "$MOSAIC_AGENT_WORKDIR"
 
 # ── Launch the tmux session (no exec — we continue to wire the heartbeat) ────
-tmux -L "$MOSAIC_TMUX_SOCKET" new-session -d -s "$AGENT_NAME" -c "$MOSAIC_AGENT_WORKDIR" \
+_tmux new-session -d -s "$AGENT_NAME" -c "$MOSAIC_AGENT_WORKDIR" \
   bash -c "$PANE_SHELL_SNIPPET"
 
 # ── Resolve the pane PID (retry briefly to let the session initialise) ────────
 PANE_PID=""
 for _retry in 1 2 3 4 5; do
-  PANE_PID=$(tmux -L "$MOSAIC_TMUX_SOCKET" list-panes \
+  PANE_PID=$(_tmux list-panes \
     -t "=${AGENT_NAME}:0.0" -F '#{pane_pid}' 2>/dev/null || true)
   [ -n "$PANE_PID" ] && break
   sleep 0.2

packages/mosaic/framework/tools/quality/scripts/test-install-migration.sh

@@ -61,7 +61,25 @@ MOSAIC_HOME="$T5" MOSAIC_INSTALL_MODE=bogus MOSAIC_SYNC_ONLY=1 bash "$INSTALL" >
 chk "F5 failure: invalid mode rejected (nonzero exit)" "[ $rc -ne 0 ]"
 chk "F5 failure: SOUL + credentials intact" "grep -q orig '$T5/SOUL.md' && grep -q keepme '$T5/credentials/c.json'"
 
-rm -rf "$T1" "$T2" "$T3" "$T4" "$T5"
+# F6 — keep-mode re-seed (the `mosaic update` path) MUST NOT wipe user fleet data.
+# Regression for the roster-loss bug: fleet/ was not in PRESERVE_PATHS.
+T6=$(mktemp -d); mkdir -p "$T6/fleet/examples" "$T6/fleet/run" "$T6/fleet/agents"
+printf '# persona\n' > "$T6/SOUL.md"   # makes it a recognized existing install (→ keep mode)
+printf 'version: 1\nagents:\n  - name: coder0\n' > "$T6/fleet/roster.yaml"
+printf 'version: 1\nagents:\n  - name: custom\n' > "$T6/fleet/my-fleet.yaml"
+printf 'ts=x\n' > "$T6/fleet/run/coder0.hb"
+printf 'MOSAIC_AGENT_NAME=coder0\n' > "$T6/fleet/agents/coder0.env"
+printf '# stale preset\n' > "$T6/fleet/examples/general.yaml"
+echo 3 > "$T6/.framework-version"
+run "$T6" keep
+chk "F6 reseed: user roster.yaml SURVIVES keep-mode sync" "grep -q coder0 '$T6/fleet/roster.yaml'"
+chk "F6 reseed: other user fleet/*.yaml survives (glob)" "[ -f '$T6/fleet/my-fleet.yaml' ]"
+chk "F6 reseed: per-agent env (fleet/agents) survives" "[ -f '$T6/fleet/agents/coder0.env' ]"
+chk "F6 reseed: heartbeat run dir (fleet/run) survives" "[ -f '$T6/fleet/run/coder0.hb' ]"
+chk "F6 reseed: framework examples ARE refreshed (not preserved stale)" "grep -q orchestrator '$T6/fleet/examples/general.yaml'"
+chk "F6 reseed: framework roster.schema.json seeded" "[ -f '$T6/fleet/roster.schema.json' ]"
+
+rm -rf "$T1" "$T2" "$T3" "$T4" "$T5" "$T6"
 echo
 echo "RESULT: $pass passed, $fail failed"
 [ "$fail" -eq 0 ]

packages/mosaic/framework/tools/tmux/README.md

@@ -35,7 +35,7 @@ delivers reliably to local OR remote panes.
 agent-send.sh -s <dst_session> -m "message"
 
 # Local target on a Mosaic fleet socket
-agent-send.sh -L mosaic-factory -s '=coder0' -m "message"
+agent-send.sh -L mosaic-fleet -s '=coder0' -m "message"
 
 # Remote target (over ssh)
 agent-send.sh -H user@host -s <dst_session> -m "message"
@@ -58,9 +58,9 @@ commands do not fall back to tmux's prefix matching behavior.
 Durable Mosaic fleets should use a dedicated tmux socket, for example:
 
 ```bash
-tmux -L mosaic-factory ls
+tmux -L mosaic-fleet ls
-agent-send.sh -L mosaic-factory -s '=coder0' -m "status?"
+agent-send.sh -L mosaic-fleet -s '=coder0' -m "status?"
-send-message.sh -L mosaic-factory -t '=coder0' -m "raw pane message"
+send-message.sh -L mosaic-fleet -t '=coder0' -m "raw pane message"
 ```
 
 This keeps fleet operations away from the user's default tmux server. It is the

packages/mosaic/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@mosaicstack/mosaic",
-  "version": "0.0.39",
+  "version": "0.0.40",
   "repository": {
     "type": "git",
     "url": "https://git.mosaicstack.dev/mosaicstack/stack.git",

packages/mosaic/src/cli.ts

@@ -27,6 +27,7 @@ import {
   formatAllPackagesTable,
   getInstallAllCommand,
   runFrameworkReseed,
+  refreshActiveFleetUnits,
   readRosterAgentNames,
   buildRelaunchCommands,
   FRAMEWORK_RESEED_PACKAGE,
@@ -466,6 +467,12 @@ program
       const reseed = runFrameworkReseed();
       if (reseed.ok) {
         console.log('✔ Framework re-seeded.');
+        // Propagate shipped systemd unit fixes to the ACTIVE units (re-seed only
+        // touches ~/.config/mosaic/systemd/user; systemd runs ~/.config/systemd/user).
+        const units = refreshActiveFleetUnits();
+        if (units.refreshed.length > 0) {
+          console.log(`✔ Refreshed ${units.refreshed.length} active systemd unit(s).`);
+        }
         const agents = readRosterAgentNames();
         if (agents.length > 0) {
           if (opts.relaunch) {

packages/mosaic/src/commands/compose-contract.spec.ts

@@ -56,6 +56,55 @@ describe('composeContract — overlay composer', () => {
     rmSync(cwdDir, { recursive: true, force: true });
   });
 
+  it('injects the fleet comms cheat-sheet for a spawned fleet agent (situational)', () => {
+    // A spawned agent has MOSAIC_AGENT_NAME set + is a member of the roster.
+    mkdirSync(join(fixture.home, 'fleet'), { recursive: true });
+    writeFileSync(
+      join(fixture.home, 'fleet', 'roster.yaml'),
+      [
+        'version: 1',
+        'transport: tmux',
+        'agents:',
+        '  - name: orchestrator',
+        '    runtime: claude',
+        '    class: orchestrator',
+        '  - name: enhancer',
+        '    runtime: claude',
+        '    class: enhancer',
+        '  - name: coder0-0',
+        '    runtime: claude',
+        '    class: implementer',
+        '    host: 10.1.10.37',
+        '    ssh: jwoltje@10.1.10.37',
+        '',
+      ].join('\n'),
+    );
+    const prev = process.env['MOSAIC_AGENT_NAME'];
+    try {
+      process.env['MOSAIC_AGENT_NAME'] = 'enhancer';
+      const out = composeContract('claude', fixture.home);
+      expect(out).toContain('# Fleet Comms');
+      expect(out).toMatch(/`\[[^\]]+:enhancer\]`/); // own [host:session] identity (host machine-dependent)
+      // local peer → no -H; cross-host peer → -H ssh
+      expect(out).toContain('-s orchestrator -m "…"');
+      expect(out).toContain('-H jwoltje@10.1.10.37 -s coder0-0 -m "…"');
+      expect(out).not.toContain('-H jwoltje@10.1.10.37 -s orchestrator'); // local stays local
+    } finally {
+      if (prev === undefined) delete process.env['MOSAIC_AGENT_NAME'];
+      else process.env['MOSAIC_AGENT_NAME'] = prev;
+    }
+  });
+
+  it('does NOT inject fleet comms when MOSAIC_AGENT_NAME is unset (non-fleet launch)', () => {
+    const prev = process.env['MOSAIC_AGENT_NAME'];
+    try {
+      delete process.env['MOSAIC_AGENT_NAME'];
+      expect(composeContract('claude', fixture.home)).not.toContain('# Fleet Comms');
+    } finally {
+      if (prev !== undefined) process.env['MOSAIC_AGENT_NAME'] = prev;
+    }
+  });
+
   it('includes the per-tier anchors and the selected harness runtime', () => {
     const out = composeContract('claude', fixture.home);
     expect(out).toContain('GATE-1: the non-negotiable law.'); // L0

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

@@ -15,6 +15,7 @@ import {
   buildFleetServiceCommand,
   buildSystemdEnableCommand,
   buildSystemdDisableCommand,
+  socketArgs,
   buildSystemdShowCommand,
   buildTmuxListPanesCommand,
   buildTmuxListSessionsCommand,
@@ -94,6 +95,7 @@ describe('registerFleetCommand', () => {
     expect(agent).toBeDefined();
     expect(agent!.options.map((option) => option.long)).toContain('--list');
     expect(agent!.commands.map((command) => command.name()).sort()).toEqual([
+      'comms-block',
       'reset',
       'roster',
       'send',
@@ -114,7 +116,7 @@ describe('fleet roster parsing', () => {
     }
   });
 
-  it('defaults local canary rosters to the isolated mosaic-factory socket', async () => {
+  it('defaults a socket-less roster to the literal default tmux socket (empty, no -L)', async () => {
     cleanup = await tempDir();
     const rosterPath = join(cleanup, 'roster.yaml');
     await writeFile(
@@ -131,12 +133,55 @@ describe('fleet roster parsing', () => {
 
     const roster = await loadFleetRoster(rosterPath);
 
-    expect(roster.tmux.socketName).toBe('mosaic-factory');
+    expect(roster.tmux.socketName).toBe(''); // absent ⇒ default socket (no -L), not mosaic-fleet
     expect(roster.tmux.holderSession).toBe('_holder');
     expect(roster.agents).toHaveLength(1);
     expect(getRosterAgent(roster, 'canary-pi').runtime).toBe('pi');
   });
 
+  it('socketArgs: named socket → -L <name>; empty → no -L (default socket)', () => {
+    expect(socketArgs('mosaic-fleet')).toEqual(['-L', 'mosaic-fleet']);
+    expect(socketArgs('')).toEqual([]);
+  });
+
+  it('honors an explicit socket_name (renders -L) — containment for shipped presets', async () => {
+    cleanup = await tempDir();
+    const rosterPath = join(cleanup, 'roster.yaml');
+    await writeFile(
+      rosterPath,
+      [
+        'version: 1',
+        'transport: tmux',
+        'tmux:',
+        '  socket_name: mosaic-fleet',
+        'agents:',
+        '  - name: canary-pi',
+        '    runtime: pi',
+      ].join('\n'),
+    );
+    const roster = await loadFleetRoster(rosterPath);
+    expect(roster.tmux.socketName).toBe('mosaic-fleet');
+    expect(buildTmuxListSessionsCommand(roster.tmux.socketName)).toContain('-L');
+  });
+
+  it('maps a per-agent model_hint into MOSAIC_AGENT_MODEL', async () => {
+    cleanup = await tempDir();
+    const rosterPath = join(cleanup, 'roster.json');
+    await writeFile(
+      rosterPath,
+      JSON.stringify({
+        version: 1,
+        transport: 'tmux',
+        agents: [{ name: 'coder0', runtime: 'pi', model_hint: 'openai-codex/gpt-5.5:high' }],
+      }),
+    );
+    const roster = await loadFleetRoster(rosterPath);
+    const env = generateAgentEnv(roster, getRosterAgent(roster, 'coder0'));
+    expect(env).toContain('MOSAIC_AGENT_MODEL=openai-codex/gpt-5.5:high');
+    // socket-less roster ⇒ a bare empty socket (no quotes), so spawn uses no -L
+    expect(env).toContain('MOSAIC_TMUX_SOCKET=\n');
+  });
+
   it('generates deterministic per-agent EnvironmentFile content', async () => {
     cleanup = await tempDir();
     const rosterPath = join(cleanup, 'roster.json');
@@ -145,7 +190,7 @@ describe('fleet roster parsing', () => {
       JSON.stringify({
         version: 1,
         transport: 'tmux',
-        tmux: { socket_name: 'mosaic-factory' },
+        tmux: { socket_name: 'mosaic-fleet' },
         defaults: { working_directory: '/srv/mosaic' },
         agents: [{ name: 'coder0', runtime: 'codex', class: 'implementer' }],
       }),
@@ -156,8 +201,9 @@ describe('fleet roster parsing', () => {
       [
         'MOSAIC_AGENT_NAME=coder0',
         'MOSAIC_AGENT_RUNTIME=codex',
+        'MOSAIC_AGENT_MODEL=',
         'MOSAIC_AGENT_WORKDIR=/srv/mosaic',
-        'MOSAIC_TMUX_SOCKET=mosaic-factory',
+        'MOSAIC_TMUX_SOCKET=mosaic-fleet',
         '',
       ].join('\n'),
     );
@@ -168,7 +214,7 @@ describe('fleet roster parsing', () => {
       'MOSAIC_AGENT_NAME=coder0',
       'MOSAIC_AGENT_RUNTIME=codex',
       'MOSAIC_AGENT_WORKDIR=/srv/new',
-      'MOSAIC_TMUX_SOCKET=mosaic-factory',
+      'MOSAIC_TMUX_SOCKET=mosaic-fleet',
       '',
     ].join('\n');
     const existing = [
@@ -186,7 +232,7 @@ describe('fleet roster parsing', () => {
         'MOSAIC_AGENT_NAME=coder0',
         'MOSAIC_AGENT_RUNTIME=codex',
         'MOSAIC_AGENT_WORKDIR=/srv/new',
-        'MOSAIC_TMUX_SOCKET=mosaic-factory',
+        'MOSAIC_TMUX_SOCKET=mosaic-fleet',
         'MOSAIC_AGENT_COMMAND=/home/jarvis/.config/mosaic/fleet/canary.sh',
         '# site note',
         '',
@@ -279,7 +325,7 @@ describe('fleet roster parsing', () => {
     const localCanary = await loadFleetRoster(join(examplesDir, 'local-canary.yaml'));
 
     expect(minimal.agents.map((agent) => agent.name)).toEqual(['canary-pi']);
-    expect(localCanary.tmux.socketName).toBe('mosaic-factory');
+    expect(localCanary.tmux.socketName).toBe('mosaic-fleet');
     expect(localCanary.agents.map((agent) => agent.name)).toEqual(['lead', 'coder0', 'reviewer0']);
     expect(localCanaryText).not.toMatch(/usc|ultron|secrev/i);
   });
@@ -304,11 +350,11 @@ describe('fleet command construction', () => {
   it('builds socket-scoped agent send commands', () => {
     const paths = resolveFleetPaths('/home/test/.config/mosaic');
     expect(
-      buildAgentSendCommand(paths, 'coder0', 'hello', 'mosaic-factory', 'operator:mosaic-cli'),
+      buildAgentSendCommand(paths, 'coder0', 'hello', 'mosaic-fleet', 'operator:mosaic-cli'),
     ).toEqual([
       '/home/test/.config/mosaic/tools/tmux/agent-send.sh',
       '-L',
-      'mosaic-factory',
+      'mosaic-fleet',
       '-S',
       'operator:mosaic-cli',
       '-s',
@@ -355,8 +401,9 @@ describe('fleet command construction', () => {
     try {
       await program.parseAsync(['node', 'mosaic', 'fleet', 'verify']);
       expect(calls).toEqual([
-        ['tmux', '-L', 'mosaic-factory', 'has-session', '-t', '=_holder:0.0'],
+        // socket-less roster ⇒ default tmux socket (no -L)
-        ['tmux', '-L', 'mosaic-factory', 'has-session', '-t', '=coder0:0.0'],
+        ['tmux', 'has-session', '-t', '=_holder:0.0'],
+        ['tmux', 'has-session', '-t', '=coder0:0.0'],
       ]);
     } finally {
       await rm(home, { recursive: true, force: true });
@@ -637,7 +684,7 @@ describe('fleet command construction', () => {
     try {
       await program.parseAsync(['node', 'mosaic', 'agent', 'status', 'json-agent']);
       expect(calls).toEqual([
-        ['tmux', '-L', 'mosaic-factory', 'has-session', '-t', '=json-agent:0.0'],
+        ['tmux', 'has-session', '-t', '=json-agent:0.0'], // socket-less ⇒ no -L
       ]);
     } finally {
       await rm(home, { recursive: true, force: true });
@@ -677,8 +724,6 @@ describe('fleet command construction', () => {
       expect(calls).toEqual([
         [
           join(home, 'tools', 'tmux', 'agent-send.sh'),
-          '-L',
-          'mosaic-factory',
           '-S',
           getDefaultOperatorSourceLabel(),
           '-s',
@@ -727,8 +772,6 @@ describe('fleet command construction', () => {
       expect(calls).toEqual([
         [
           join(home, 'tools', 'tmux', 'agent-send.sh'),
-          '-L',
-          'mosaic-factory',
           '-S',
           'lead:manual',
           '-s',
@@ -799,10 +842,10 @@ describe('fleet ps — command construction', () => {
   });
 
   it('builds exact tmux list-panes command with the correct format string', () => {
-    expect(buildTmuxListPanesCommand('canary-pi', 'mosaic-factory')).toEqual([
+    expect(buildTmuxListPanesCommand('canary-pi', 'mosaic-fleet')).toEqual([
       'tmux',
       '-L',
-      'mosaic-factory',
+      'mosaic-fleet',
       'list-panes',
       '-t',
       '=canary-pi:0.0',
@@ -811,9 +854,11 @@ describe('fleet ps — command construction', () => {
     ]);
   });
 
-  it('uses DEFAULT_SOCKET_NAME when socket is omitted from list-panes', () => {
+  it('uses the default tmux socket (no -L) when socket is omitted from list-panes', () => {
     const cmd = buildTmuxListPanesCommand('canary-pi');
-    expect(cmd[2]).toBe('mosaic-factory');
+    expect(cmd).not.toContain('-L'); // omitted socket ⇒ default socket
+    expect(cmd[0]).toBe('tmux');
+    expect(cmd[1]).toBe('list-panes');
   });
 
   it('derives heartbeat path under ~/.config/mosaic/fleet/run/', () => {
@@ -1123,7 +1168,7 @@ describe('fleet install — auto-enable units for boot-survival', () => {
     const minimalRoster: FleetRoster = {
       version: 1,
       transport: 'tmux',
-      tmux: { socketName: 'mosaic-factory', holderSession: '_holder' },
+      tmux: { socketName: 'mosaic-fleet', holderSession: '_holder' },
       defaults: { workingDirectory: '~/src' },
       runtimes: { codex: { resetCommand: '/clear' } },
       agents: [{ name: 'coder0', runtime: 'codex', className: 'worker' }],
@@ -1145,7 +1190,7 @@ describe('fleet install — auto-enable units for boot-survival', () => {
     const minimalRoster: FleetRoster = {
       version: 1,
       transport: 'tmux',
-      tmux: { socketName: 'mosaic-factory', holderSession: '_holder' },
+      tmux: { socketName: 'mosaic-fleet', holderSession: '_holder' },
       defaults: { workingDirectory: '~/src' },
       runtimes: { codex: { resetCommand: '/clear' } },
       agents: [{ name: 'coder0', runtime: 'codex', className: 'worker' }],
@@ -1172,7 +1217,7 @@ describe('fleet install — auto-enable units for boot-survival', () => {
     const minimalRoster: FleetRoster = {
       version: 1,
       transport: 'tmux',
-      tmux: { socketName: 'mosaic-factory', holderSession: '_holder' },
+      tmux: { socketName: 'mosaic-fleet', holderSession: '_holder' },
       defaults: { workingDirectory: '~/src' },
       runtimes: { codex: { resetCommand: '/clear' } },
       agents: [{ name: 'coder0', runtime: 'codex', className: 'worker' }],
@@ -1331,8 +1376,9 @@ describe('fleet ps — command sequences issued', () => {
       await program.parseAsync(['node', 'mosaic', 'fleet', 'ps']);
       expect(calls).toEqual([
         buildSystemdShowCommand('coder0'),
-        buildTmuxListPanesCommand('coder0', 'mosaic-factory'),
+        // socket-less roster ⇒ default socket (no -L)
-        buildTmuxListSessionsCommand('mosaic-factory'),
+        buildTmuxListPanesCommand('coder0'),
+        buildTmuxListSessionsCommand(),
       ]);
     } finally {
       console.log = origLog;
@@ -1343,19 +1389,20 @@ describe('fleet ps — command sequences issued', () => {
 
 describe('buildTmuxListSessionsCommand', () => {
   it('builds exact list-sessions command with session_name format', () => {
-    expect(buildTmuxListSessionsCommand('mosaic-factory')).toEqual([
+    expect(buildTmuxListSessionsCommand('mosaic-fleet')).toEqual([
       'tmux',
       '-L',
-      'mosaic-factory',
+      'mosaic-fleet',
       'list-sessions',
       '-F',
       '#{session_name}',
     ]);
   });
 
-  it('uses DEFAULT_SOCKET_NAME when socket is omitted', () => {
+  it('uses the default tmux socket (no -L) when socket is omitted', () => {
     const cmd = buildTmuxListSessionsCommand();
-    expect(cmd[2]).toBe('mosaic-factory');
+    expect(cmd).not.toContain('-L');
+    expect(cmd).toEqual(['tmux', 'list-sessions', '-F', '#{session_name}']);
   });
 });
 
@@ -1596,11 +1643,11 @@ describe('fleet ps — unmanaged socket sessions', () => {
 describe('agent watch', () => {
   it('builds exact grouped-viewer creation command', () => {
     expect(
-      buildAgentWatchCreateViewerCommand('canary-pi', 'canary-pi-watch-123', 'mosaic-factory'),
+      buildAgentWatchCreateViewerCommand('canary-pi', 'canary-pi-watch-123', 'mosaic-fleet'),
     ).toEqual([
       'tmux',
       '-L',
-      'mosaic-factory',
+      'mosaic-fleet',
       'new-session',
       '-d',
       '-t',
@@ -1611,10 +1658,10 @@ describe('agent watch', () => {
   });
 
   it('builds exact viewer attach command (read-only)', () => {
-    expect(buildAgentWatchAttachCommand('canary-pi-watch-123', 'mosaic-factory')).toEqual([
+    expect(buildAgentWatchAttachCommand('canary-pi-watch-123', 'mosaic-fleet')).toEqual([
       'tmux',
       '-L',
-      'mosaic-factory',
+      'mosaic-fleet',
       'attach',
       '-r',
       '-t',
@@ -1623,19 +1670,20 @@ describe('agent watch', () => {
   });
 
   it('builds exact viewer kill command', () => {
-    expect(buildAgentWatchKillViewerCommand('canary-pi-watch-123', 'mosaic-factory')).toEqual([
+    expect(buildAgentWatchKillViewerCommand('canary-pi-watch-123', 'mosaic-fleet')).toEqual([
       'tmux',
       '-L',
-      'mosaic-factory',
+      'mosaic-fleet',
       'kill-session',
       '-t',
       'canary-pi-watch-123',
     ]);
   });
 
-  it('buildAgentWatchCommand (deprecated) still uses DEFAULT_SOCKET_NAME when socket is omitted', () => {
+  it('buildAgentWatchCommand (deprecated) uses the default tmux socket (no -L) when socket is omitted', () => {
     const cmd = buildAgentWatchCommand('canary-pi');
-    expect(cmd[2]).toBe('mosaic-factory');
+    expect(cmd).not.toContain('-L'); // omitted socket ⇒ default socket
+    expect(cmd[0]).toBe('tmux');
     expect(cmd).toContain('-r');
   });
 
@@ -1722,10 +1770,10 @@ describe('agent watch', () => {
 
 describe('agent send --verify', () => {
   it('builds exact verify capture-pane command', () => {
-    expect(buildAgentVerifyAcceptedCommand('canary-pi', 'mosaic-factory', 5)).toEqual([
+    expect(buildAgentVerifyAcceptedCommand('canary-pi', 'mosaic-fleet', 5)).toEqual([
       'tmux',
       '-L',
-      'mosaic-factory',
+      'mosaic-fleet',
       'capture-pane',
       '-t',
       '=canary-pi:0.0',
@@ -1829,9 +1877,10 @@ describe('agent send --verify', () => {
 
       // 3 calls: BEFORE-capture, send, AFTER-capture (pane changed on first poll → accepted immediately)
       expect(calls).toHaveLength(3);
-      expect(calls[0]).toEqual(buildAgentVerifyAcceptedCommand('coder0', 'mosaic-factory', 5));
+      // socket-less roster ⇒ default socket (no -L)
+      expect(calls[0]).toEqual(buildAgentVerifyAcceptedCommand('coder0', '', 5));
       expect(calls[1]![0]).toContain('agent-send.sh');
-      expect(calls[2]).toEqual(buildAgentVerifyAcceptedCommand('coder0', 'mosaic-factory', 5));
+      expect(calls[2]).toEqual(buildAgentVerifyAcceptedCommand('coder0', '', 5));
     } finally {
       await rm(home, { recursive: true, force: true });
     }
@@ -2436,7 +2485,7 @@ describe('fleet add/remove — pure helpers', () => {
   const baseRoster: FleetRoster = {
     version: 1,
     transport: 'tmux',
-    tmux: { socketName: 'mosaic-factory', holderSession: '_holder' },
+    tmux: { socketName: 'mosaic-fleet', holderSession: '_holder' },
     defaults: { workingDirectory: '~/src' },
     runtimes: { codex: { resetCommand: '/clear' } },
     agents: [
@@ -2562,7 +2611,7 @@ describe('fleet add/remove — pure helpers', () => {
       await writeFile(rosterPath, yaml);
       const loaded = await loadFleetRoster(rosterPath);
       expect(loaded.agents.map((a) => a.name)).toEqual(['orchestrator', 'coder0']);
-      expect(loaded.tmux.socketName).toBe('mosaic-factory');
+      expect(loaded.tmux.socketName).toBe('mosaic-fleet');
       expect(loaded.agents[0]!.className).toBe('orchestrator');
     } finally {
       await rm(dir, { recursive: true, force: true });

packages/mosaic/src/commands/fleet.ts

@@ -7,6 +7,7 @@ import { spawn } from 'node:child_process';
 import * as readline from 'node:readline';
 import type { Command } from 'commander';
 import YAML from 'yaml';
+import { resolveCommsBlock } from '../fleet/comms-onboarding.js';
 
 /**
  * A function that spawns a command with inherited stdio (TTY passthrough).
@@ -117,10 +118,26 @@ export interface FleetPaths {
 
 type FleetServiceAction = 'start' | 'stop' | 'restart' | 'status';
 
-const DEFAULT_SOCKET_NAME = 'mosaic-factory';
+/**
+ * The named tmux socket the canonical fleet uses. Kept as a public constant for
+ * rosters/callers that explicitly want isolation; it is NO LONGER the silent
+ * fallback for a socket-less roster (that now resolves to the default socket).
+ */
+export const DEFAULT_SOCKET_NAME = 'mosaic-fleet';
 const DEFAULT_HOLDER_SESSION = '_holder';
 const DEFAULT_WORKING_DIRECTORY = '~/src';
 
+/**
+ * tmux `-L` args for a socket name. An empty/absent socket ⇒ the LITERAL default
+ * tmux socket (no `-L`), so spawn, observe (`fleet ps`/watch), and the onboarding
+ * cheat-sheet all agree. A named socket ⇒ `-L <name>`. `DEFAULT_SOCKET_NAME`
+ * remains a constant for callers that explicitly want mosaic-fleet; it is no
+ * longer the silent fallback for a socket-less roster.
+ */
+export function socketArgs(socketName: string): string[] {
+  return socketName ? ['-L', socketName] : [];
+}
+
 /**
  * Default poll interval (ms) between capture-pane checks in `send --verify`.
  * Kept short enough to react quickly while not hammering tmux on busy hosts.
@@ -185,6 +202,10 @@ export function generateAgentEnv(roster: FleetRoster, agent: FleetAgent): string
   return [
     `MOSAIC_AGENT_NAME=${shellEnvValue(agent.name)}`,
     `MOSAIC_AGENT_RUNTIME=${shellEnvValue(agent.runtime)}`,
+    // Per-agent model hint → start-agent-session.sh appends `--model <hint>` to
+    // the `mosaic yolo` launch so workers run on the roster's model (e.g. pi on
+    // openai-codex/gpt-5.5:high). Empty when the agent declares no model_hint.
+    `MOSAIC_AGENT_MODEL=${shellEnvValue(agent.modelHint ?? '')}`,
     `MOSAIC_AGENT_WORKDIR=${shellEnvValue(expandHome(workingDirectory))}`,
     `MOSAIC_TMUX_SOCKET=${shellEnvValue(roster.tmux.socketName)}`,
     '',
@@ -319,13 +340,12 @@ export function buildAgentSendCommand(
   paths: FleetPaths,
   agentName: string,
   message: string,
-  socketName = DEFAULT_SOCKET_NAME,
+  socketName = '',
   sourceLabel = getDefaultOperatorSourceLabel(),
 ): string[] {
   return [
     join(paths.tmuxToolsDir, 'agent-send.sh'),
-    '-L',
+    ...socketArgs(socketName),
-    socketName,
     '-S',
     sourceLabel,
     '-s',
@@ -344,12 +364,11 @@ export function buildAgentResetCommand(
   paths: FleetPaths,
   agentName: string,
   resetCommand: string,
-  socketName = DEFAULT_SOCKET_NAME,
+  socketName = '',
 ): string[] {
   return [
     join(paths.tmuxToolsDir, 'send-message.sh'),
-    '-L',
+    ...socketArgs(socketName),
-    socketName,
     '-t',
     `=${agentName}`,
     '-m',
@@ -357,15 +376,10 @@ export function buildAgentResetCommand(
   ];
 }
 
-export function buildAgentTailCommand(
+export function buildAgentTailCommand(agentName: string, lines: number, socketName = ''): string[] {
-  agentName: string,
-  lines: number,
-  socketName = DEFAULT_SOCKET_NAME,
-): string[] {
   return [
     'tmux',
-    '-L',
+    ...socketArgs(socketName),
-    socketName,
     'capture-pane',
     '-t',
     `=${agentName}:0.0`,
@@ -449,14 +463,10 @@ export function buildSystemdShowCommand(agentName: string): string[] {
  * Returns the tmux list-panes command for an agent pane.
  * Format: `#{pane_pid} #{pane_current_command} #{pane_dead} #{pane_activity}`
  */
-export function buildTmuxListPanesCommand(
+export function buildTmuxListPanesCommand(agentName: string, socketName = ''): string[] {
-  agentName: string,
-  socketName = DEFAULT_SOCKET_NAME,
-): string[] {
   return [
     'tmux',
-    '-L',
+    ...socketArgs(socketName),
-    socketName,
     'list-panes',
     '-t',
     `=${agentName}:0.0`,
@@ -470,8 +480,8 @@ export function buildTmuxListPanesCommand(
  * Format: `tmux -L <socket> list-sessions -F '#{session_name}'`
  * Used to discover ad-hoc sessions that are not in the roster.
  */
-export function buildTmuxListSessionsCommand(socketName = DEFAULT_SOCKET_NAME): string[] {
+export function buildTmuxListSessionsCommand(socketName = ''): string[] {
-  return ['tmux', '-L', socketName, 'list-sessions', '-F', '#{session_name}'];
+  return ['tmux', ...socketArgs(socketName), 'list-sessions', '-F', '#{session_name}'];
 }
 
 /**
@@ -653,12 +663,11 @@ export function getDefaultTenantAndHost(): { tenant_id: string; host: string } {
 export function buildAgentWatchCreateViewerCommand(
   agentName: string,
   viewerSessionName: string,
-  socketName = DEFAULT_SOCKET_NAME,
+  socketName = '',
 ): string[] {
   return [
     'tmux',
-    '-L',
+    ...socketArgs(socketName),
-    socketName,
     'new-session',
     '-d',
     '-t',
@@ -672,11 +681,8 @@ export function buildAgentWatchCreateViewerCommand(
  * Builds the interactive attach command for a viewer session (read-only).
  * Must be run via interactiveRunner (stdio: 'inherit').
  */
-export function buildAgentWatchAttachCommand(
+export function buildAgentWatchAttachCommand(viewerSessionName: string, socketName = ''): string[] {
-  viewerSessionName: string,
+  return ['tmux', ...socketArgs(socketName), 'attach', '-r', '-t', viewerSessionName];
-  socketName = DEFAULT_SOCKET_NAME,
-): string[] {
-  return ['tmux', '-L', socketName, 'attach', '-r', '-t', viewerSessionName];
 }
 
 /**
@@ -685,9 +691,9 @@ export function buildAgentWatchAttachCommand(
  */
 export function buildAgentWatchKillViewerCommand(
   viewerSessionName: string,
-  socketName = DEFAULT_SOCKET_NAME,
+  socketName = '',
 ): string[] {
-  return ['tmux', '-L', socketName, 'kill-session', '-t', viewerSessionName];
+  return ['tmux', ...socketArgs(socketName), 'kill-session', '-t', viewerSessionName];
 }
 
 /**
@@ -705,11 +711,8 @@ export function buildViewerSessionName(agentName: string): string {
  *
  * Kept for backward compatibility only.
  */
-export function buildAgentWatchCommand(
+export function buildAgentWatchCommand(agentName: string, socketName = ''): string[] {
-  agentName: string,
+  return ['tmux', ...socketArgs(socketName), 'attach', '-r', '-t', `=${agentName}`];
-  socketName = DEFAULT_SOCKET_NAME,
-): string[] {
-  return ['tmux', '-L', socketName, 'attach', '-r', '-t', `=${agentName}`];
 }
 
 /**
@@ -719,13 +722,12 @@ export function buildAgentWatchCommand(
  */
 export function buildAgentVerifyAcceptedCommand(
   agentName: string,
-  socketName = DEFAULT_SOCKET_NAME,
+  socketName = '',
   lines = 5,
 ): string[] {
   return [
     'tmux',
-    '-L',
+    ...socketArgs(socketName),
-    socketName,
     'capture-pane',
     '-t',
     `=${agentName}:0.0`,
@@ -989,8 +991,7 @@ export function registerFleetCommand(program: Command, deps: FleetCommandDeps =
       const socketName = roster.tmux.socketName;
       await runChecked(runner, [
         'tmux',
-        '-L',
+        ...socketArgs(socketName),
-        socketName,
         'has-session',
         '-t',
         `=${roster.tmux.holderSession}:0.0`,
@@ -998,8 +999,7 @@ export function registerFleetCommand(program: Command, deps: FleetCommandDeps =
       for (const agent of roster.agents) {
         await runChecked(runner, [
           'tmux',
-          '-L',
+          ...socketArgs(socketName),
-          socketName,
           'has-session',
           '-t',
           `=${agent.name}:0.0`,
@@ -1360,6 +1360,23 @@ export function registerFleetAgentCommands(
       }
     });
 
+  agentCommand
+    .command('comms-block <role>')
+    .description(
+      "Print the Fleet Comms cheat-sheet for a roster role (preview a peer's peer-reach view)",
+    )
+    .option('--host <host>', 'Override the fleet host (preview a cross-host peer view)')
+    .action((role: string, opts: { host?: string }) => {
+      const mosaicHome = resolveMosaicHomeFromCommand(agentCommand, deps.mosaicHome);
+      const res = resolveCommsBlock(mosaicHome, role, opts.host);
+      if (!res.ok) {
+        console.error(`[mosaic] comms-block: ${res.error}`);
+        process.exitCode = 1;
+        return;
+      }
+      console.log(res.output);
+    });
+
   agentCommand
     .command('status [agent]')
     .description('Show tmux status for the local fleet or one agent')
@@ -1370,8 +1387,8 @@ export function registerFleetAgentCommands(
         getRosterAgent(roster, agent);
       }
       const command = agent
-        ? ['tmux', '-L', roster.tmux.socketName, 'has-session', '-t', `=${agent}:0.0`]
+        ? ['tmux', ...socketArgs(roster.tmux.socketName), 'has-session', '-t', `=${agent}:0.0`]
-        : ['tmux', '-L', roster.tmux.socketName, 'ls'];
+        : ['tmux', ...socketArgs(roster.tmux.socketName), 'ls'];
       const result = await runner(...splitCommand(command));
       if (opts.json) {
         console.log(
@@ -1689,9 +1706,12 @@ function normalizeRoster(raw: RawFleetRoster): FleetRoster {
     version: 1,
     transport: 'tmux',
     tmux: {
+      // Absent socket_name ⇒ '' (the literal default tmux socket, no -L) — NOT
+      // mosaic-fleet. Shipped presets set socket_name explicitly, so they are
+      // unaffected; only socket-less rosters get default-socket behavior.
       socketName: stringValue(
         raw.tmux?.socket_name ?? raw.tmux?.socketName,
-        DEFAULT_SOCKET_NAME,
+        '',
         'Fleet roster tmux socket_name',
       ),
       holderSession: stringValue(
@@ -1857,6 +1877,12 @@ function expandHome(path: string): string {
 }
 
 function shellEnvValue(value: string): string {
+  // Empty ⇒ a bare `VAR=` (unambiguous empty in a systemd EnvironmentFile and
+  // when shell-sourced). Quoting it as '' risks a literal two-char value (e.g.
+  // a tmux socket named "''"), which would defeat the default-socket behavior.
+  if (value === '') {
+    return '';
+  }
   if (/^[A-Za-z0-9_./:=@+-]+$/.test(value)) {
     return value;
   }

packages/mosaic/src/commands/launch.ts

@@ -19,6 +19,7 @@ import { createRequire } from 'node:module';
 import { homedir } from 'node:os';
 import { join, dirname } from 'node:path';
 import type { Command } from 'commander';
+import { readFleetCommsBlock } from '../fleet/comms-onboarding.js';
 
 const MOSAIC_HOME = process.env['MOSAIC_HOME'] ?? join(homedir(), '.config', 'mosaic');
 
@@ -383,6 +384,12 @@ For required push/merge/issue-close/release actions, execute without routine con
   // Runtime-specific contract
   parts.push('\n\n# Runtime-Specific Contract\n\n' + readFileSync(runtimeFile, 'utf-8'));
 
+  // Fleet onboarding: when this is a spawned fleet agent (MOSAIC_AGENT_NAME set
+  // and present in the roster), inject a comms cheat-sheet + peer roster so it
+  // knows how to reach the orchestrator and its peers from its first turn.
+  const fleetComms = readFleetCommsBlock(mosaicHome, process.env['MOSAIC_AGENT_NAME']);
+  if (fleetComms) parts.push('\n\n' + fleetComms);
+
   return parts.join('\n');
 }
 

packages/mosaic/src/config/file-adapter.test.ts

@@ -153,6 +153,30 @@ describe('FileConfigAdapter.syncFramework — defaults seeding', () => {
     expect(readFileSync(join(fixture.mosaicHome, 'AGENTS.md'), 'utf-8')).toBe('# AGENTS default\n');
   });
 
+  it('preserves user fleet data (roster.yaml, agents/, run/) through a keep-mode sync', async () => {
+    // Regression for the roster-loss bug (#631): user-authored fleet files must
+    // survive the framework re-seed that `mosaic update` runs.
+    mkdirSync(join(fixture.mosaicHome, 'fleet', 'run'), { recursive: true });
+    mkdirSync(join(fixture.mosaicHome, 'fleet', 'agents'), { recursive: true });
+    writeFileSync(join(fixture.mosaicHome, 'fleet', 'roster.yaml'), 'version: 1\nMINE\n');
+    writeFileSync(join(fixture.mosaicHome, 'fleet', 'run', 'a.hb'), 'ts=x\n');
+    writeFileSync(join(fixture.mosaicHome, 'fleet', 'agents', 'a.env'), 'X=1\n');
+    // The framework ships fleet/examples — it should still seed/refresh.
+    mkdirSync(join(fixture.sourceDir, 'fleet', 'examples'), { recursive: true });
+    writeFileSync(join(fixture.sourceDir, 'fleet', 'examples', 'general.yaml'), '# preset\n');
+
+    const adapter = new FileConfigAdapter(fixture.mosaicHome, fixture.sourceDir);
+    await adapter.syncFramework('keep');
+
+    expect(readFileSync(join(fixture.mosaicHome, 'fleet', 'roster.yaml'), 'utf-8')).toBe(
+      'version: 1\nMINE\n',
+    );
+    expect(existsSync(join(fixture.mosaicHome, 'fleet', 'run', 'a.hb'))).toBe(true);
+    expect(existsSync(join(fixture.mosaicHome, 'fleet', 'agents', 'a.env'))).toBe(true);
+    // framework-owned fleet/examples is seeded
+    expect(existsSync(join(fixture.mosaicHome, 'fleet', 'examples', 'general.yaml'))).toBe(true);
+  });
+
   it('is a no-op for seeding when defaults/ dir does not exist', async () => {
     rmSync(fixture.defaultsDir, { recursive: true });
 

packages/mosaic/src/config/file-adapter.ts

@@ -173,6 +173,13 @@ export class FileConfigAdapter implements ConfigService {
             'memory',
             'sources',
             'credentials',
+            // User-authored fleet data MUST survive `mosaic update`'s re-seed.
+            // The framework seeds only fleet/examples + fleet/roles +
+            // fleet/roster.schema.json; the operator's roster, per-agent env, and
+            // heartbeat run dir stay user-owned. (Mirror of install.sh PRESERVE_PATHS.)
+            'fleet/*.yaml',
+            'fleet/agents',
+            'fleet/run',
           ]
         : [];
 

packages/mosaic/src/fleet/comms-onboarding.spec.ts

@@ -0,0 +1,238 @@
+import { describe, it, expect, beforeEach, afterEach } from 'vitest';
+import { mkdtempSync, mkdirSync, writeFileSync, rmSync } from 'node:fs';
+import { tmpdir } from 'node:os';
+import { join } from 'node:path';
+import {
+  parseRosterAgents,
+  buildFleetCommsBlock,
+  renderPeerReach,
+  readFleetCommsBlock,
+  resolveCommsBlock,
+  type CommsPeer,
+} from './comms-onboarding.js';
+
+const ROSTER = [
+  'version: 1',
+  'transport: tmux',
+  'agents:',
+  '  - name: orchestrator',
+  '    runtime: claude',
+  '    class: orchestrator',
+  '  - name: enhancer',
+  '    runtime: claude',
+  '    class: enhancer',
+  '  - name: coder0',
+  '    runtime: pi',
+  '    class: implementer',
+  '  # a manually-listed cross-host peer (pre-federation stopgap)',
+  '  - name: coder0-0',
+  '    runtime: claude',
+  '    class: implementer',
+  '    host: 10.1.10.37',
+  '    ssh: jwoltje@10.1.10.37',
+  '',
+].join('\n');
+
+describe('parseRosterAgents', () => {
+  it('parses name + class + optional host/ssh', () => {
+    const peers = parseRosterAgents(ROSTER);
+    expect(peers.map((p) => p.name)).toEqual(['orchestrator', 'enhancer', 'coder0', 'coder0-0']);
+    expect(peers.find((p) => p.name === 'coder0')).toMatchObject({ className: 'implementer' });
+    expect(peers.find((p) => p.name === 'coder0-0')).toMatchObject({
+      className: 'implementer',
+      host: '10.1.10.37',
+      ssh: 'jwoltje@10.1.10.37',
+    });
+    // local agents have no host/ssh
+    expect(peers.find((p) => p.name === 'orchestrator')!.host).toBeUndefined();
+  });
+
+  it('parses an optional per-agent socket', () => {
+    const peers = parseRosterAgents(
+      ['agents:', '  - name: a', '    class: worker', '    socket: mosaic-fleet'].join('\n'),
+    );
+    expect(peers[0]).toMatchObject({ name: 'a', socket: 'mosaic-fleet' });
+  });
+
+  it('stops at the next top-level key', () => {
+    const peers = parseRosterAgents(
+      ['agents:', '  - name: a', '    class: worker', 'defaults:', '  working_directory: ~'].join(
+        '\n',
+      ),
+    );
+    expect(peers.map((p) => p.name)).toEqual(['a']);
+  });
+});
+
+describe('renderPeerReach — same-host vs cross-host', () => {
+  const send = '/home/u/.config/mosaic/tools/tmux/agent-send.sh';
+
+  it('renders the short form for a same-host peer', () => {
+    const peer: CommsPeer = { name: 'enhancer', className: 'enhancer' };
+    expect(renderPeerReach(peer, 'w-jarvis', send)).toBe(`${send} -s enhancer -m "…"`);
+  });
+
+  it('renders the -H form for a cross-host peer using ssh', () => {
+    const peer: CommsPeer = {
+      name: 'coder0-0',
+      className: 'implementer',
+      host: '10.1.10.37',
+      ssh: 'jwoltje@10.1.10.37',
+    };
+    expect(renderPeerReach(peer, 'w-jarvis', send)).toBe(
+      `${send} -H jwoltje@10.1.10.37 -s coder0-0 -m "…"`,
+    );
+  });
+
+  it('falls back to host when a cross-host peer has no ssh', () => {
+    const peer: CommsPeer = { name: 'x', className: 'worker', host: '10.0.0.9' };
+    expect(renderPeerReach(peer, 'w-jarvis', send)).toBe(`${send} -H 10.0.0.9 -s x -m "…"`);
+  });
+
+  it('treats a peer whose host equals the fleet host as same-host', () => {
+    const peer: CommsPeer = { name: 'y', className: 'worker', host: 'w-jarvis' };
+    expect(renderPeerReach(peer, 'w-jarvis', send)).toBe(`${send} -s y -m "…"`);
+  });
+
+  it('emits NO -L for an unset/default socket', () => {
+    const peer: CommsPeer = { name: 'lead', className: 'orchestrator' };
+    expect(renderPeerReach(peer, 'w-jarvis', send)).toBe(`${send} -s lead -m "…"`);
+  });
+
+  it('emits -L <socket> for a named socket', () => {
+    const peer: CommsPeer = { name: 'coder0', className: 'implementer', socket: 'mosaic-fleet' };
+    expect(renderPeerReach(peer, 'w-jarvis', send)).toBe(
+      `${send} -L mosaic-fleet -s coder0 -m "…"`,
+    );
+  });
+
+  it('combines -L (named socket) and -H (cross-host) in order', () => {
+    const peer: CommsPeer = {
+      name: 'coder0-0',
+      className: 'implementer',
+      host: '10.1.10.37',
+      ssh: 'jwoltje@10.1.10.37',
+      socket: 'mosaic-fleet',
+    };
+    expect(renderPeerReach(peer, 'w-jarvis', send)).toBe(
+      `${send} -L mosaic-fleet -H jwoltje@10.1.10.37 -s coder0-0 -m "…"`,
+    );
+  });
+});
+
+describe('buildFleetCommsBlock', () => {
+  const send = '/h/.config/mosaic/tools/tmux/agent-send.sh';
+  const agents = parseRosterAgents(ROSTER);
+
+  it('excludes self, lists peers, flags the orchestrator, and emits both address forms', () => {
+    const block = buildFleetCommsBlock({
+      selfName: 'enhancer',
+      agents,
+      fleetHost: 'w-jarvis',
+      agentSendPath: send,
+    });
+    expect(block).toContain('# Fleet Comms');
+    expect(block).toContain('You are **enhancer**');
+    // criterion 1: agent's own [host:session] identity
+    expect(block).toContain('`[w-jarvis:enhancer]`');
+    // self excluded
+    expect(block).not.toMatch(/\|\s*enhancer\s*\|/);
+    // peers present
+    expect(block).toContain('| orchestrator |');
+    expect(block).toContain('point of contact');
+    // same-host peer short form
+    expect(block).toContain(`${send} -s coder0 -m "…"`);
+    // cross-host peer -H form + host annotation
+    expect(block).toContain(`${send} -H jwoltje@10.1.10.37 -s coder0-0 -m "…"`);
+    expect(block).toContain('host `10.1.10.37`');
+    // conventions
+    expect(block).toContain('FLIP the preamble');
+    expect(block).toContain('ACCEPTED');
+  });
+
+  it('returns empty when the agent has no peers', () => {
+    expect(
+      buildFleetCommsBlock({
+        selfName: 'solo',
+        agents: [{ name: 'solo', className: 'orchestrator' }],
+        fleetHost: 'h',
+        agentSendPath: send,
+      }),
+    ).toBe('');
+  });
+});
+
+describe('readFleetCommsBlock — situational (the context a spawned agent gets)', () => {
+  let home: string;
+  beforeEach(() => {
+    home = mkdtempSync(join(tmpdir(), 'mosaic-comms-'));
+    mkdirSync(join(home, 'fleet'), { recursive: true });
+    writeFileSync(join(home, 'fleet', 'roster.yaml'), ROSTER);
+  });
+  afterEach(() => rmSync(home, { recursive: true, force: true }));
+
+  it('builds the cheat-sheet with correct peer addresses for a fleet member', () => {
+    const block = readFleetCommsBlock(home, 'orchestrator', 'w-jarvis');
+    expect(block).toContain('# Fleet Comms');
+    expect(block).toContain('| enhancer |');
+    expect(block).toContain(`${join(home, 'tools', 'tmux', 'agent-send.sh')} -s coder0 -m "…"`);
+    expect(block).toContain('-H jwoltje@10.1.10.37 -s coder0-0');
+    expect(block).not.toMatch(/\|\s*orchestrator\s*\|/); // self excluded
+  });
+
+  it('returns empty when MOSAIC_AGENT_NAME is unset, no roster, or agent not a member', () => {
+    expect(readFleetCommsBlock(home, undefined, 'w-jarvis')).toBe('');
+    expect(readFleetCommsBlock(home, 'stranger', 'w-jarvis')).toBe('');
+    expect(readFleetCommsBlock(mkdtempSync(join(tmpdir(), 'noroster-')), 'orchestrator')).toBe('');
+  });
+});
+
+describe('resolveCommsBlock — `mosaic fleet comms-block <role>` emitter semantics', () => {
+  // The emitter wraps readFleetCommsBlock but must NEVER print an empty string silently:
+  // an unknown role / missing roster has to fail loud (caller maps !ok → stderr + exit 1)
+  // so `mosaic fleet comms-block bogus` is a visible error, not a confusing no-op. The
+  // success path returns the block verbatim for `mosaic fleet comms-block <peer>` previews.
+  let home: string;
+  beforeEach(() => {
+    home = mkdtempSync(join(tmpdir(), 'mosaic-commsblk-'));
+    mkdirSync(join(home, 'fleet'), { recursive: true });
+    writeFileSync(join(home, 'fleet', 'roster.yaml'), ROSTER);
+  });
+  afterEach(() => rmSync(home, { recursive: true, force: true }));
+
+  it('returns ok + the cheat-sheet for a roster member', () => {
+    const res = resolveCommsBlock(home, 'orchestrator', 'w-jarvis');
+    expect(res.ok).toBe(true);
+    expect(res.output).toContain('# Fleet Comms');
+    expect(res.output).toContain('| enhancer |');
+    expect(res.error).toBeUndefined();
+  });
+
+  it('fails loud (not ok + error naming the role) for a non-member — never silently empty', () => {
+    const res = resolveCommsBlock(home, 'stranger', 'w-jarvis');
+    expect(res.ok).toBe(false);
+    expect(res.output).toBe('');
+    expect(res.error).toContain('stranger');
+  });
+
+  it('fails loud when no roster exists at the mosaic home', () => {
+    const noRoster = mkdtempSync(join(tmpdir(), 'mosaic-noroster-'));
+    const res = resolveCommsBlock(noRoster, 'orchestrator', 'w-jarvis');
+    expect(res.ok).toBe(false);
+    expect(res.error).toBeTruthy();
+    rmSync(noRoster, { recursive: true, force: true });
+  });
+
+  it('fails loud for a missing role argument', () => {
+    const res = resolveCommsBlock(home, undefined, 'w-jarvis');
+    expect(res.ok).toBe(false);
+    expect(res.error).toBeTruthy();
+  });
+
+  it('honors a host override so a peer can preview its own cross-host view', () => {
+    // coder0-0 viewing with its own host → its self-identity line uses that host.
+    const res = resolveCommsBlock(home, 'coder0-0', '10.1.10.37');
+    expect(res.ok).toBe(true);
+    expect(res.output).toContain('`[10.1.10.37:coder0-0]`');
+  });
+});

packages/mosaic/src/fleet/comms-onboarding.ts

@@ -0,0 +1,226 @@
+/**
+ * Fleet onboarding-injection (#620).
+ *
+ * Fleet agents are born not knowing how to reach their peers — the root cause of
+ * a spawned agent's failed first send. When an agent boots via `mosaic yolo
+ * <runtime>` (→ composeContract → system prompt), we append a comms cheat-sheet
+ * + peer roster so it can talk to the orchestrator and other agents immediately.
+ *
+ * Cross-host aware: a peer may carry `host`/`ssh` (a deliberate pre-federation
+ * stopgap — manual cross-host listing; federation/W1 auto-discovers later), so a
+ * w-jarvis agent is born knowing the exact `-H` command to reach a dragon-lin
+ * peer. Same-host peers render the short form.
+ *
+ * Standalone (no fleet.ts import) to keep launch.ts's prompt path free of the
+ * heavy fleet command module. The roster is parsed leniently — the cheat-sheet
+ * is best-effort onboarding, never a hard dependency.
+ */
+
+import { existsSync, readFileSync } from 'node:fs';
+import { homedir, hostname } from 'node:os';
+import { join } from 'node:path';
+
+export interface CommsPeer {
+  name: string;
+  /** Roster `class` (orchestrator | enhancer | implementer | worker | …). */
+  className: string;
+  /** Host the peer runs on; absent ⇒ the fleet host (same host). */
+  host?: string;
+  /** SSH target (user@host) for a cross-host peer; renders the `-H` form. */
+  ssh?: string;
+  /** tmux socket the peer's session lives on; absent ⇒ default socket (no `-L`). */
+  socket?: string;
+}
+
+/**
+ * Lenient parse of a fleet `roster.yaml` for agent name/class/host/ssh. Avoids a
+ * dependency on the full fleet roster parser; the format is `- name:` list items
+ * with `class:`/`host:`/`ssh:` siblings under `agents:`.
+ */
+export function parseRosterAgents(yamlText: string): CommsPeer[] {
+  const peers: CommsPeer[] = [];
+  let current: CommsPeer | null = null;
+  let inAgents = false;
+  const scalar = (line: string, key: string): string | null => {
+    const m = line.match(new RegExp(`^\\s*${key}:\\s*["']?([^"'#]+?)["']?\\s*$`));
+    return m ? (m[1] as string).trim() : null;
+  };
+  for (const rawLine of yamlText.split('\n')) {
+    const line = rawLine.replace(/\s+$/, '');
+    if (/^agents:\s*$/.test(line)) {
+      inAgents = true;
+      continue;
+    }
+    if (!inAgents) continue;
+    // A new top-level key (no leading space) ends the agents block.
+    if (/^\S/.test(line)) break;
+
+    const nameMatch = line.match(/^\s*-\s*name:\s*["']?([A-Za-z0-9._-]+)["']?\s*$/);
+    if (nameMatch) {
+      if (current) peers.push(current);
+      current = { name: nameMatch[1] as string, className: 'worker' };
+      continue;
+    }
+    if (!current) continue;
+    const cls = scalar(line, 'class');
+    if (cls) current.className = cls;
+    const host = scalar(line, 'host');
+    if (host) current.host = host;
+    const ssh = scalar(line, 'ssh');
+    if (ssh) current.ssh = ssh;
+    const socket = scalar(line, 'socket');
+    if (socket) current.socket = socket;
+  }
+  if (current) peers.push(current);
+  return peers;
+}
+
+export interface FleetCommsOptions {
+  /** This agent's name (it is excluded from its own peer list). */
+  selfName: string;
+  /** All roster agents (including self; filtered out internally). */
+  agents: CommsPeer[];
+  /** Host the fleet runs on (short hostname) — the same-host baseline. */
+  fleetHost: string;
+  /** Absolute path to agent-send.sh in this install. */
+  agentSendPath: string;
+}
+
+/** Is this peer on a different host than the fleet baseline? */
+function isRemote(peer: CommsPeer, fleetHost: string): boolean {
+  return peer.host !== undefined && peer.host !== fleetHost;
+}
+
+/**
+ * Render the exact agent-send command to reach a peer (session = agent name).
+ * Data-driven per peer: a named `socket` → `-L <socket>`; an unset socket → the
+ * default tmux socket (no `-L`). A cross-host peer adds `-H <ssh|host>`.
+ */
+export function renderPeerReach(peer: CommsPeer, fleetHost: string, agentSendPath: string): string {
+  const parts = [agentSendPath];
+  if (peer.socket) parts.push('-L', peer.socket); // unset ⇒ default socket, no -L
+  if (isRemote(peer, fleetHost)) parts.push('-H', peer.ssh ?? (peer.host as string));
+  parts.push('-s', peer.name, '-m', '"…"');
+  return parts.join(' ');
+}
+
+/**
+ * Build the `# Fleet Comms` onboarding block (pure markdown). Returns '' when
+ * the agent has no peers (a single-agent roster has no one to talk to).
+ */
+export function buildFleetCommsBlock(opts: FleetCommsOptions): string {
+  const peers = opts.agents.filter((a) => a.name !== opts.selfName);
+  if (peers.length === 0) return '';
+
+  const orchestrator = peers.find((p) => p.className === 'orchestrator');
+  const rows = peers
+    .map((p) => {
+      const where = isRemote(p, opts.fleetHost)
+        ? `${p.className} · host \`${p.host}\``
+        : p.className;
+      const role = p.className === 'orchestrator' ? `${where} ← point of contact` : where;
+      return `| ${p.name} | ${role} | \`${renderPeerReach(p, opts.fleetHost, opts.agentSendPath)}\` |`;
+    })
+    .join('\n');
+
+  const orchLine = orchestrator
+    ? `Your point of contact is **${orchestrator.name}** (the orchestrator) — route questions, ` +
+      `status, and decisions there.`
+    : `This fleet has no orchestrator in its roster; coordinate with your peers directly.`;
+
+  return `# Fleet Comms — reach your peers
+
+You are **${opts.selfName}** in this fleet. Your comms identity is \`[${opts.fleetHost}:${opts.selfName}]\` —
+that is the \`<src>\` other agents see and reply to. Reach other agents (durable tmux sessions) with the
+Mosaic comms tool at \`${opts.agentSendPath}\`. The **Reach** column below is the exact command per peer:
+same-host peers use the short form (no \`-H\`); cross-host peers include \`-H <user@host>\`.
+
+## Peers
+
+| Agent | Role | Reach (session = agent name) |
+| ----- | ---- | ---------------------------- |
+${rows}
+
+${orchLine}
+
+## Conventions
+
+- Every message carries a self-identifying preamble \`[<src_host>:<src_session> -> <dst_host>:<dst_session>]\` — \`agent-send.sh\` adds it automatically.
+- **To reply, FLIP the preamble:** address your reply to the sender's \`src\` (their host:session becomes your \`-s\`/\`-H\`).
+- \`agent-send.sh\` (a.k.a. \`agent send --verify\`) confirms the message was **ACCEPTED** at the destination prompt — not merely injected. Prefer it for anything that matters.`;
+}
+
+/**
+ * Read the fleet roster from `mosaicHome` and build the comms block for
+ * `selfName`. Returns '' when there is no roster, the agent is not in it, or
+ * there are no peers — onboarding is best-effort and never throws.
+ */
+export function readFleetCommsBlock(
+  mosaicHome: string,
+  selfName: string | undefined,
+  fleetHost: string = hostname().split('.')[0] || 'localhost',
+): string {
+  if (!selfName) return '';
+  const rosterPath = join(mosaicHome, 'fleet', 'roster.yaml');
+  if (!existsSync(rosterPath)) return '';
+  let text: string;
+  try {
+    text = readFileSync(rosterPath, 'utf-8');
+  } catch {
+    return '';
+  }
+  const agents = parseRosterAgents(text);
+  if (!agents.some((a) => a.name === selfName)) return ''; // not a member of this fleet
+  return buildFleetCommsBlock({
+    selfName,
+    agents,
+    fleetHost,
+    agentSendPath: join(mosaicHome, 'tools', 'tmux', 'agent-send.sh'),
+  });
+}
+
+/** Result of resolving a comms-block emit request — see `mosaic fleet comms-block`. */
+export interface CommsBlockResult {
+  /** True when a cheat-sheet was produced; false maps to stderr + non-zero exit. */
+  ok: boolean;
+  /** The Fleet-Comms cheat-sheet (empty unless ok). */
+  output: string;
+  /** Operator-facing reason when !ok. */
+  error?: string;
+}
+
+/**
+ * Resolve the Fleet-Comms cheat-sheet for an explicit <role>, backing the
+ * `mosaic fleet comms-block <role>` command. Unlike readFleetCommsBlock — which
+ * returns '' on any miss so composeContract can no-op silently during a launch —
+ * this NEVER silently emits empty: an unknown role or missing roster yields
+ * ok:false + an operator-facing reason, so the CLI surfaces it (stderr + exit 1)
+ * rather than printing nothing. That makes it safe to preview any peer's view,
+ * e.g. `mosaic fleet comms-block coder0-0`.
+ */
+export function resolveCommsBlock(
+  mosaicHome: string,
+  role: string | undefined,
+  fleetHost?: string,
+): CommsBlockResult {
+  if (!role) {
+    return { ok: false, output: '', error: 'comms-block requires a <role> argument' };
+  }
+  const block = fleetHost
+    ? readFleetCommsBlock(mosaicHome, role, fleetHost)
+    : readFleetCommsBlock(mosaicHome, role);
+  if (!block) {
+    const rosterPath = join(mosaicHome, 'fleet', 'roster.yaml');
+    return {
+      ok: false,
+      output: '',
+      error: existsSync(rosterPath)
+        ? `role "${role}" is not a member of the fleet roster at ${rosterPath}`
+        : `no fleet roster at ${rosterPath}`,
+    };
+  }
+  return { ok: true, output: block };
+}
+
+/** Default mosaic home (mirrors launch.ts), for callers that don't pass one. */
+export const DEFAULT_MOSAIC_HOME_FOR_COMMS = join(homedir(), '.config', 'mosaic');

packages/mosaic/src/fleet/connectors/matrix.spec.ts

@@ -0,0 +1,184 @@
+import { describe, it, expect, beforeEach } from 'vitest';
+import {
+  MatrixConnector,
+  buildMessageBody,
+  parseSyncResponse,
+  registerMatrixConnector,
+  type FetchLike,
+} from './matrix.js';
+import { createConnector, _resetConnectorRegistry } from './registry.js';
+import type { MatrixConnectorConfig } from './types.js';
+
+const CONFIG: MatrixConnectorConfig = {
+  homeserverUrl: 'https://matrix.internal/',
+  userId: '@mos:internal',
+  roomId: '!room:internal',
+};
+
+/** A fetch mock that returns queued responses and records calls. */
+function mockFetch(responses: Array<{ ok?: boolean; status?: number; body?: unknown }>): {
+  fetchImpl: FetchLike;
+  calls: Array<{ url: string; method?: string; body?: string }>;
+} {
+  const calls: Array<{ url: string; method?: string; body?: string }> = [];
+  let i = 0;
+  const fetchImpl: FetchLike = async (url, init) => {
+    calls.push({ url, method: init?.method, body: init?.body });
+    const r = responses[Math.min(i, responses.length - 1)] ?? {};
+    i += 1;
+    return {
+      ok: r.ok ?? true,
+      status: r.status ?? 200,
+      json: async () => r.body ?? {},
+      text: async () => JSON.stringify(r.body ?? {}),
+    };
+  };
+  return { fetchImpl, calls };
+}
+
+describe('buildMessageBody', () => {
+  it('builds an m.text event', () => {
+    expect(buildMessageBody({ text: 'hi' })).toEqual({ msgtype: 'm.text', body: 'hi' });
+  });
+  it('adds an m.thread relation when threadId is set', () => {
+    expect(buildMessageBody({ text: 'hi', threadId: '$evt' })).toEqual({
+      msgtype: 'm.text',
+      body: 'hi',
+      'm.relates_to': { rel_type: 'm.thread', event_id: '$evt' },
+    });
+  });
+});
+
+describe('parseSyncResponse', () => {
+  it('extracts operator messages and skips the orchestrator’s own echoes', () => {
+    const data = {
+      next_batch: 's2',
+      rooms: {
+        join: {
+          '!room:internal': {
+            timeline: {
+              events: [
+                {
+                  type: 'm.room.message',
+                  sender: '@jason:internal',
+                  origin_server_ts: 1_700_000_000_000,
+                  content: { body: 'status?' },
+                },
+                {
+                  type: 'm.room.message',
+                  sender: '@mos:internal', // self — skipped
+                  origin_server_ts: 1_700_000_001_000,
+                  content: { body: 'working on it' },
+                },
+                { type: 'm.reaction', sender: '@jason:internal', content: {} }, // non-message
+              ],
+            },
+          },
+        },
+      },
+    };
+    const msgs = parseSyncResponse(data, '!room:internal', '@mos:internal');
+    expect(msgs).toHaveLength(1);
+    expect(msgs[0]).toMatchObject({ text: 'status?', sender: '@jason:internal' });
+    expect(msgs[0]!.ts).toBe(new Date(1_700_000_000_000).toISOString());
+  });
+
+  it('carries threadId through thread-relments', () => {
+    const data = {
+      rooms: {
+        join: {
+          '!room:internal': {
+            timeline: {
+              events: [
+                {
+                  type: 'm.room.message',
+                  sender: '@jason:internal',
+                  origin_server_ts: 1,
+                  content: {
+                    body: 'in thread',
+                    'm.relates_to': { rel_type: 'm.thread', event_id: '$root' },
+                  },
+                },
+              ],
+            },
+          },
+        },
+      },
+    };
+    expect(parseSyncResponse(data, '!room:internal', '@mos:internal')[0]!.threadId).toBe('$root');
+  });
+
+  it('returns [] for an empty/foreign sync', () => {
+    expect(parseSyncResponse({}, '!room:internal', '@mos:internal')).toEqual([]);
+  });
+});
+
+describe('MatrixConnector', () => {
+  it('throws without an access token', () => {
+    expect(() => new MatrixConnector(CONFIG, { accessToken: '' })).toThrow(/access token/i);
+  });
+
+  it('send PUTs an m.text event and returns the event id', async () => {
+    const { fetchImpl, calls } = mockFetch([{ body: { event_id: '$abc' } }]);
+    const c = new MatrixConnector(CONFIG, { accessToken: 'tok', fetchImpl });
+    const res = await c.send({ text: 'pong' }, 1234);
+    expect(res).toEqual({ delivered: true, messageId: '$abc' });
+    expect(calls[0]!.method).toBe('PUT');
+    expect(calls[0]!.url).toContain(
+      '/_matrix/client/v3/rooms/!room%3Ainternal/send/m.room.message/mosaic-1234-1',
+    );
+    expect(JSON.parse(calls[0]!.body!)).toEqual({ msgtype: 'm.text', body: 'pong' });
+  });
+
+  it('send reports not-delivered on a non-2xx', async () => {
+    const { fetchImpl } = mockFetch([{ ok: false, status: 403 }]);
+    const c = new MatrixConnector(CONFIG, { accessToken: 'tok', fetchImpl });
+    const res = await c.send({ text: 'x' });
+    expect(res.delivered).toBe(false);
+    expect(res.error).toContain('403');
+  });
+
+  it('health reports reachable + authenticated when whoami matches', async () => {
+    const { fetchImpl } = mockFetch([
+      { body: { versions: ['v1.11'] } }, // /versions
+      { body: { user_id: '@mos:internal' } }, // /whoami
+    ]);
+    const c = new MatrixConnector(CONFIG, { accessToken: 'tok', fetchImpl });
+    const h = await c.health();
+    expect(h.reachable).toBe(true);
+    expect(h.authenticated).toBe(true);
+  });
+
+  it('health flags auth mismatch', async () => {
+    const { fetchImpl } = mockFetch([
+      { body: {} },
+      { body: { user_id: '@someone-else:internal' } },
+    ]);
+    const c = new MatrixConnector(CONFIG, { accessToken: 'tok', fetchImpl });
+    const h = await c.health();
+    expect(h.reachable).toBe(true);
+    expect(h.authenticated).toBe(false);
+  });
+
+  it('health reports unreachable when /versions fails', async () => {
+    const { fetchImpl } = mockFetch([{ ok: false, status: 502 }]);
+    const c = new MatrixConnector(CONFIG, { accessToken: 'tok', fetchImpl });
+    const h = await c.health();
+    expect(h.reachable).toBe(false);
+  });
+});
+
+describe('registerMatrixConnector', () => {
+  beforeEach(() => _resetConnectorRegistry());
+
+  it('registers a matrix factory createConnector can build', () => {
+    registerMatrixConnector({ MATRIX_ACCESS_TOKEN: 'tok' } as NodeJS.ProcessEnv);
+    const c = createConnector({ kind: 'matrix', matrix: CONFIG });
+    expect(c.kind).toBe('matrix');
+  });
+
+  it('the factory rejects config missing the matrix block', () => {
+    registerMatrixConnector({ MATRIX_ACCESS_TOKEN: 'tok' } as NodeJS.ProcessEnv);
+    expect(() => createConnector({ kind: 'matrix' })).toThrow(/missing the .matrix. block/i);
+  });
+});

packages/mosaic/src/fleet/connectors/matrix.ts

@@ -0,0 +1,246 @@
+/**
+ * Matrix connector (F4 Phase 2) — speaks the Matrix client-server API directly
+ * over HTTPS so it is homeserver-agnostic (Conduit default, Synapse alt). No
+ * SDK: a small injectable fetch keeps it dependency-light and unit-testable.
+ *
+ * The access token is supplied by the caller (from the environment —
+ * MATRIX_ACCESS_TOKEN — per the gateway secret pattern), never the roster.
+ */
+
+import {
+  type OrchestratorConnector,
+  type OutboundMessage,
+  type InboundMessage,
+  type SendResult,
+  type ConnectorHealth,
+  type MatrixConnectorConfig,
+  type Unsubscribe,
+} from './types.js';
+import { registerConnector } from './registry.js';
+
+/** Minimal fetch surface — avoids a lib.dom dependency and is trivial to mock. */
+export interface FetchLike {
+  (
+    url: string,
+    init?: { method?: string; headers?: Record<string, string>; body?: string },
+  ): Promise<{
+    ok: boolean;
+    status: number;
+    json: () => Promise<unknown>;
+    text: () => Promise<string>;
+  }>;
+}
+
+export interface MatrixConnectorOptions {
+  accessToken: string;
+  /** Injectable fetch (defaults to global fetch). */
+  fetchImpl?: FetchLike;
+  /** Long-poll timeout for /sync, ms. */
+  syncTimeoutMs?: number;
+}
+
+/** Build the `m.room.message` event content, threading when a threadId is set. */
+export function buildMessageBody(message: OutboundMessage): Record<string, unknown> {
+  const content: Record<string, unknown> = {
+    msgtype: 'm.text',
+    body: message.text,
+  };
+  if (message.threadId) {
+    content['m.relates_to'] = { rel_type: 'm.thread', event_id: message.threadId };
+  }
+  return content;
+}
+
+/** Shape of the bits of a /sync response we consume. */
+interface SyncResponse {
+  next_batch?: string;
+  rooms?: {
+    join?: Record<
+      string,
+      {
+        timeline?: {
+          events?: Array<{
+            type?: string;
+            sender?: string;
+            origin_server_ts?: number;
+            content?: {
+              body?: string;
+              ['m.relates_to']?: { rel_type?: string; event_id?: string };
+            };
+          }>;
+        };
+      }
+    >;
+  };
+}
+
+/**
+ * Extract inbound operator messages from a /sync response for one room,
+ * skipping the orchestrator's own echoes. Pure — the testable core of receive.
+ */
+export function parseSyncResponse(
+  data: unknown,
+  roomId: string,
+  selfUserId: string,
+): InboundMessage[] {
+  const sync = data as SyncResponse;
+  const events = sync.rooms?.join?.[roomId]?.timeline?.events ?? [];
+  const out: InboundMessage[] = [];
+  for (const ev of events) {
+    if (ev.type !== 'm.room.message') continue;
+    if (!ev.sender || ev.sender === selfUserId) continue; // skip our own messages
+    const body = ev.content?.body;
+    if (typeof body !== 'string') continue;
+    const rel = ev.content?.['m.relates_to'];
+    out.push({
+      text: body,
+      sender: ev.sender,
+      ts: new Date(ev.origin_server_ts ?? 0).toISOString(),
+      ...(rel?.rel_type === 'm.thread' && rel.event_id ? { threadId: rel.event_id } : {}),
+    });
+  }
+  return out;
+}
+
+export class MatrixConnector implements OrchestratorConnector {
+  readonly kind = 'matrix' as const;
+  private readonly fetchImpl: FetchLike;
+  private readonly token: string;
+  private readonly syncTimeoutMs: number;
+  private txnCounter = 0;
+  private stopped = false;
+
+  constructor(
+    private readonly config: MatrixConnectorConfig,
+    opts: MatrixConnectorOptions,
+  ) {
+    this.token = opts.accessToken;
+    this.fetchImpl = opts.fetchImpl ?? (globalThis.fetch as unknown as FetchLike);
+    this.syncTimeoutMs = opts.syncTimeoutMs ?? 30_000;
+    if (!this.token) {
+      throw new Error('MatrixConnector requires an access token (set MATRIX_ACCESS_TOKEN).');
+    }
+  }
+
+  private url(path: string): string {
+    return `${this.config.homeserverUrl.replace(/\/$/, '')}${path}`;
+  }
+
+  private authHeaders(): Record<string, string> {
+    return { Authorization: `Bearer ${this.token}`, 'Content-Type': 'application/json' };
+  }
+
+  /** Monotonic, unique-per-instance transaction id for idempotent sends. */
+  private nextTxnId(nowMs: number): string {
+    this.txnCounter += 1;
+    return `mosaic-${nowMs}-${this.txnCounter}`;
+  }
+
+  async send(message: OutboundMessage, nowMs = Date.now()): Promise<SendResult> {
+    const txnId = this.nextTxnId(nowMs);
+    const path = `/_matrix/client/v3/rooms/${encodeURIComponent(
+      this.config.roomId,
+    )}/send/m.room.message/${encodeURIComponent(txnId)}`;
+    try {
+      const res = await this.fetchImpl(this.url(path), {
+        method: 'PUT',
+        headers: this.authHeaders(),
+        body: JSON.stringify(buildMessageBody(message)),
+      });
+      if (!res.ok) {
+        return { delivered: false, error: `Matrix send failed: HTTP ${res.status}` };
+      }
+      const json = (await res.json()) as { event_id?: string };
+      return { delivered: true, ...(json.event_id ? { messageId: json.event_id } : {}) };
+    } catch (err) {
+      return { delivered: false, error: err instanceof Error ? err.message : String(err) };
+    }
+  }
+
+  subscribe(handler: (message: InboundMessage) => void): Unsubscribe {
+    this.stopped = false;
+    let since: string | undefined;
+    const loop = async (): Promise<void> => {
+      while (!this.stopped) {
+        try {
+          const q = new URLSearchParams({ timeout: String(this.syncTimeoutMs) });
+          if (since) q.set('since', since);
+          const res = await this.fetchImpl(this.url(`/_matrix/client/v3/sync?${q.toString()}`), {
+            method: 'GET',
+            headers: this.authHeaders(),
+          });
+          if (!res.ok) {
+            await this.backoff();
+            continue;
+          }
+          const data = await res.json();
+          since = (data as SyncResponse).next_batch ?? since;
+          for (const msg of parseSyncResponse(data, this.config.roomId, this.config.userId)) {
+            handler(msg);
+          }
+        } catch {
+          await this.backoff();
+        }
+      }
+    };
+    void loop();
+    return () => {
+      this.stopped = true;
+    };
+  }
+
+  private backoff(): Promise<void> {
+    return new Promise((resolve) => setTimeout(resolve, 2_000));
+  }
+
+  async health(): Promise<ConnectorHealth> {
+    try {
+      const versions = await this.fetchImpl(this.url('/_matrix/client/versions'), {
+        method: 'GET',
+      });
+      if (!versions.ok) {
+        return {
+          reachable: false,
+          authenticated: false,
+          detail: `versions HTTP ${versions.status}`,
+        };
+      }
+      const who = await this.fetchImpl(this.url('/_matrix/client/v3/account/whoami'), {
+        method: 'GET',
+        headers: this.authHeaders(),
+      });
+      if (!who.ok) {
+        return { reachable: true, authenticated: false, detail: `whoami HTTP ${who.status}` };
+      }
+      const json = (await who.json()) as { user_id?: string };
+      const authenticated = json.user_id === this.config.userId;
+      return {
+        reachable: true,
+        authenticated,
+        lastSeen: new Date().toISOString(),
+        ...(authenticated
+          ? {}
+          : { detail: `whoami user ${json.user_id} != ${this.config.userId}` }),
+      };
+    } catch (err) {
+      return {
+        reachable: false,
+        authenticated: false,
+        detail: err instanceof Error ? err.message : String(err),
+      };
+    }
+  }
+}
+
+/**
+ * Register the Matrix connector factory. The token is read from the environment
+ * (MATRIX_ACCESS_TOKEN) at build time, never the roster.
+ */
+export function registerMatrixConnector(env: NodeJS.ProcessEnv = process.env): void {
+  registerConnector('matrix', (config) => {
+    if (!config.matrix) {
+      throw new Error('Matrix connector config missing the `matrix` block (homeserver/user/room).');
+    }
+    return new MatrixConnector(config.matrix, { accessToken: env['MATRIX_ACCESS_TOKEN'] ?? '' });
+  });
+}

packages/mosaic/src/fleet/connectors/registry.spec.ts

@@ -0,0 +1,85 @@
+import { describe, it, expect, beforeEach } from 'vitest';
+import {
+  KNOWN_CONNECTOR_KINDS,
+  isKnownConnectorKind,
+  resolveConnectorKind,
+  registerConnector,
+  hasConnector,
+  createConnector,
+  ConnectorNotImplementedError,
+  _resetConnectorRegistry,
+} from './registry.js';
+import type { ConnectorConfig, OrchestratorConnector } from './types.js';
+
+function fakeConnector(kind: 'tmux' | 'discord' | 'matrix'): OrchestratorConnector {
+  return {
+    kind,
+    send: async () => ({ delivered: true, messageId: 'x' }),
+    subscribe: () => () => {},
+    health: async () => ({ reachable: true, authenticated: true }),
+  };
+}
+
+describe('connector registry (F4 Phase 1)', () => {
+  beforeEach(() => {
+    _resetConnectorRegistry();
+  });
+
+  it('knows the three peer connector kinds', () => {
+    expect(KNOWN_CONNECTOR_KINDS).toEqual(['tmux', 'discord', 'matrix']);
+  });
+
+  it('isKnownConnectorKind guards correctly', () => {
+    expect(isKnownConnectorKind('matrix')).toBe(true);
+    expect(isKnownConnectorKind('irc')).toBe(false);
+    expect(isKnownConnectorKind(42)).toBe(false);
+  });
+
+  it('resolveConnectorKind defaults to tmux when config is absent (back-compat)', () => {
+    expect(resolveConnectorKind(undefined)).toBe('tmux');
+    expect(resolveConnectorKind({ kind: 'matrix' })).toBe('matrix');
+  });
+
+  it('createConnector throws ConnectorNotImplementedError for an unregistered kind', () => {
+    const cfg: ConnectorConfig = { kind: 'matrix' };
+    expect(() => createConnector(cfg)).toThrow(ConnectorNotImplementedError);
+    expect(() => createConnector(cfg)).toThrow(/not implemented yet/i);
+  });
+
+  it('createConnector with no config resolves the default kind (tmux) and reports it unimplemented in Phase 1', () => {
+    try {
+      createConnector();
+      throw new Error('expected throw');
+    } catch (err) {
+      expect(err).toBeInstanceOf(ConnectorNotImplementedError);
+      expect((err as ConnectorNotImplementedError).kind).toBe('tmux');
+    }
+  });
+
+  it('register → has → create resolves a registered factory', () => {
+    expect(hasConnector('matrix')).toBe(false);
+    registerConnector('matrix', (cfg) => fakeConnector(cfg.kind));
+    expect(hasConnector('matrix')).toBe(true);
+
+    const connector = createConnector({ kind: 'matrix' });
+    expect(connector.kind).toBe('matrix');
+  });
+
+  it('passes the config through to the factory', () => {
+    let received: ConnectorConfig | null = null;
+    registerConnector('matrix', (cfg) => {
+      received = cfg;
+      return fakeConnector(cfg.kind);
+    });
+    const cfg: ConnectorConfig = {
+      kind: 'matrix',
+      matrix: {
+        homeserverUrl: 'https://matrix.internal',
+        userId: '@mos:internal',
+        roomId: '!room:internal',
+      },
+    };
+    createConnector(cfg);
+    expect(received).toEqual(cfg);
+  });
+});

packages/mosaic/src/fleet/connectors/registry.ts

@@ -0,0 +1,76 @@
+/**
+ * Connector registry (F4 Phase 1).
+ *
+ * A tiny extensible registry so connector implementations (Phase 2: tmux,
+ * Discord, Matrix) register a factory by kind and fleet core resolves one from
+ * roster config without branching on kind. Phase 1 ships the registry + the
+ * config→kind resolution; the connector factories land in Phase 2.
+ */
+
+import {
+  type ConnectorConfig,
+  type ConnectorKind,
+  type OrchestratorConnector,
+  DEFAULT_CONNECTOR_KIND,
+} from './types.js';
+
+/** The set of connector kinds the framework recognizes. */
+export const KNOWN_CONNECTOR_KINDS: readonly ConnectorKind[] = ['tmux', 'discord', 'matrix'];
+
+/** Type guard: is `value` a known connector kind? */
+export function isKnownConnectorKind(value: unknown): value is ConnectorKind {
+  return typeof value === 'string' && (KNOWN_CONNECTOR_KINDS as readonly string[]).includes(value);
+}
+
+/**
+ * Resolve the connector kind from roster config. Absent config ⇒ the default
+ * (tmux) so existing rosters keep working unchanged (back-compat).
+ */
+export function resolveConnectorKind(config?: ConnectorConfig): ConnectorKind {
+  return config?.kind ?? DEFAULT_CONNECTOR_KIND;
+}
+
+/** A factory builds a live connector from its validated config. */
+export type ConnectorFactory = (config: ConnectorConfig) => OrchestratorConnector;
+
+/** Thrown when no factory is registered for a requested kind. */
+export class ConnectorNotImplementedError extends Error {
+  constructor(public readonly kind: ConnectorKind) {
+    super(
+      `Connector "${kind}" is not implemented yet. ` +
+        `Register a factory via registerConnector('${kind}', …) (F4 Phase 2).`,
+    );
+    this.name = 'ConnectorNotImplementedError';
+  }
+}
+
+const registry = new Map<ConnectorKind, ConnectorFactory>();
+
+/** Register a connector factory for a kind (idempotent — last registration wins). */
+export function registerConnector(kind: ConnectorKind, factory: ConnectorFactory): void {
+  registry.set(kind, factory);
+}
+
+/** True when a factory is registered for `kind`. */
+export function hasConnector(kind: ConnectorKind): boolean {
+  return registry.has(kind);
+}
+
+/**
+ * Build a connector from roster config. Throws `ConnectorNotImplementedError`
+ * when no factory is registered for the resolved kind (the Phase-1 default for
+ * every kind until Phase 2 registers them).
+ */
+export function createConnector(config?: ConnectorConfig): OrchestratorConnector {
+  const kind = resolveConnectorKind(config);
+  const factory = registry.get(kind);
+  if (!factory) {
+    throw new ConnectorNotImplementedError(kind);
+  }
+  return factory(config ?? { kind });
+}
+
+/** Test/runtime helper: drop all registrations. */
+export function _resetConnectorRegistry(): void {
+  registry.clear();
+}

packages/mosaic/src/fleet/connectors/types.ts

@@ -0,0 +1,111 @@
+/**
+ * Orchestrator chat connectors (F4).
+ *
+ * A connector mediates the chat channel between the fleet **orchestrator** and
+ * its human operator. Connectors are PEERS — tmux (default), Discord, Matrix,
+ * and future first-party plugins — selected per fleet, never hardwired. Fleet
+ * core depends only on the small uniform interface below, so a new connector
+ * drops in without touching the fleet.
+ *
+ * The interface is deliberately minimal: send (orchestrator → human),
+ * subscribe (human → orchestrator), health (reachable/authed liveness). Thread
+ * support is optional metadata (`threadId`) so thread-capable connectors
+ * (Matrix rooms/threads, the future Mosaic Discord plugin) fit without an
+ * interface change.
+ */
+
+/** The connector kinds shipped/known to the framework. */
+export type ConnectorKind = 'tmux' | 'discord' | 'matrix';
+
+/** A message the orchestrator sends out to the human operator. */
+export interface OutboundMessage {
+  /** Message body (markdown where the connector supports it). */
+  text: string;
+  /** Optional thread/topic id for thread-capable connectors. */
+  threadId?: string;
+  /** Optional attachment references (paths or URLs); connector-dependent. */
+  attachments?: string[];
+}
+
+/** A message received from the human operator. */
+export interface InboundMessage {
+  /** Message body. */
+  text: string;
+  /** Thread/topic id if the connector carries one. */
+  threadId?: string;
+  /** Opaque sender identifier (connector-scoped). */
+  sender: string;
+  /** ISO-8601 timestamp the connector assigns/observes. */
+  ts: string;
+}
+
+/** Result of a send — the "ack" half of ack/health. */
+export interface SendResult {
+  /** True when the connector accepted/delivered the message. */
+  delivered: boolean;
+  /** Connector-assigned message id when available. */
+  messageId?: string;
+  /** Reason when `delivered` is false. */
+  error?: string;
+}
+
+/** Liveness of a connector — the "health" half of ack/health. */
+export interface ConnectorHealth {
+  /** The transport endpoint is reachable. */
+  reachable: boolean;
+  /** Credentials are valid / the connector is authenticated. */
+  authenticated: boolean;
+  /** ISO-8601 of the last successful interaction, if any. */
+  lastSeen?: string;
+  /** Human-readable detail (e.g. failure reason). */
+  detail?: string;
+}
+
+/** Unsubscribe handle returned by `subscribe`. */
+export type Unsubscribe = () => void;
+
+/**
+ * The uniform contract every orchestrator chat connector implements. Small by
+ * design — send / subscribe / health — so connectors are interchangeable and
+ * fleet core never branches on connector kind.
+ */
+export interface OrchestratorConnector {
+  /** Which kind of connector this is. */
+  readonly kind: ConnectorKind;
+  /** Send a message from the orchestrator to the operator. */
+  send(message: OutboundMessage): Promise<SendResult>;
+  /** Subscribe to inbound operator messages; returns an unsubscribe handle. */
+  subscribe(handler: (message: InboundMessage) => void): Unsubscribe;
+  /** Report connector liveness (reachable + authenticated). */
+  health(): Promise<ConnectorHealth>;
+}
+
+/**
+ * Connector configuration carried by the roster (the `connector` block).
+ * Secrets (access tokens, bot tokens) are NEVER stored here — they come from
+ * the environment (the gateway env-config pattern). Absent config ⇒ tmux.
+ */
+export interface ConnectorConfig {
+  kind: ConnectorKind;
+  /** Matrix connector settings (homeserver + room); token via env. */
+  matrix?: MatrixConnectorConfig;
+  /** Discord connector settings (channel); token via env. */
+  discord?: DiscordConnectorConfig;
+}
+
+export interface MatrixConnectorConfig {
+  /** Local homeserver base URL, e.g. https://matrix.example.internal */
+  homeserverUrl: string;
+  /** Full Matrix user id of the orchestrator, e.g. @mos:example.internal */
+  userId: string;
+  /** Room id/alias the orchestrator converses in. */
+  roomId: string;
+}
+
+export interface DiscordConnectorConfig {
+  /** Channel id the orchestrator converses in. */
+  channelId: string;
+}
+
+/** The default connector when a roster declares none (back-compat). */
+export const DEFAULT_CONNECTOR_KIND: ConnectorKind = 'tmux';

packages/mosaic/src/runtime/update-checker.reseed.spec.ts

@@ -7,7 +7,9 @@ import {
   buildRelaunchCommands,
   readRosterAgentNames,
   runFrameworkReseed,
+  refreshActiveFleetUnits,
 } from './update-checker.js';
+import { existsSync, readFileSync } from 'node:fs';
 
 /**
  * F3-m3 / R13: `mosaic update` re-seeds the framework + (opt-in) relaunches
@@ -83,3 +85,41 @@ describe('runFrameworkReseed', () => {
     rmSync(missing, { recursive: true, force: true });
   });
 });
+
+describe('refreshActiveFleetUnits', () => {
+  let root: string;
+  let mosaicHome: string;
+  let configHome: string;
+
+  beforeEach(() => {
+    root = mkdtempSync(join(tmpdir(), 'mosaic-units-'));
+    mosaicHome = join(root, 'mosaic');
+    configHome = join(root, 'config');
+    mkdirSync(join(mosaicHome, 'systemd', 'user'), { recursive: true });
+    mkdirSync(join(configHome, 'systemd', 'user'), { recursive: true });
+    // Freshly re-seeded units (new content).
+    writeFileSync(join(mosaicHome, 'systemd', 'user', 'mosaic-agent@.service'), 'NEW\n');
+    writeFileSync(join(mosaicHome, 'systemd', 'user', 'mosaic-tmux-holder.service'), 'NEW\n');
+  });
+  afterEach(() => rmSync(root, { recursive: true, force: true }));
+
+  it('refreshes active units when a fleet is already installed', () => {
+    // Active dir already carries mosaic units (stale) → fleet is installed.
+    writeFileSync(join(configHome, 'systemd', 'user', 'mosaic-agent@.service'), 'OLD\n');
+    const res = refreshActiveFleetUnits(mosaicHome, {
+      XDG_CONFIG_HOME: configHome,
+    } as NodeJS.ProcessEnv);
+    expect(res.refreshed).toContain('mosaic-agent@.service');
+    expect(
+      readFileSync(join(configHome, 'systemd', 'user', 'mosaic-agent@.service'), 'utf-8'),
+    ).toBe('NEW\n');
+  });
+
+  it('is a no-op when no fleet is installed (active dir has no mosaic units)', () => {
+    const res = refreshActiveFleetUnits(mosaicHome, {
+      XDG_CONFIG_HOME: configHome,
+    } as NodeJS.ProcessEnv);
+    expect(res.refreshed).toEqual([]);
+    expect(existsSync(join(configHome, 'systemd', 'user', 'mosaic-agent@.service'))).toBe(false);
+  });
+});

packages/mosaic/src/runtime/update-checker.ts

@@ -14,7 +14,14 @@
  */
 
 import { execSync } from 'node:child_process';
-import { existsSync, mkdirSync, readFileSync, writeFileSync } from 'node:fs';
+import {
+  existsSync,
+  mkdirSync,
+  readFileSync,
+  writeFileSync,
+  readdirSync,
+  copyFileSync,
+} from 'node:fs';
 import { homedir } from 'node:os';
 import { dirname, join, resolve } from 'node:path';
 import { fileURLToPath } from 'node:url';
@@ -536,6 +543,47 @@ export function readRosterAgentNames(mosaicHome = join(homedir(), '.config', 'mo
   return names;
 }
 
+/**
+ * Refresh the ACTIVE systemd user units from the freshly re-seeded copies.
+ *
+ * The re-seed updates `~/.config/mosaic/systemd/user/*.service`, but the units
+ * systemd actually runs live at `~/.config/systemd/user/`. Without this copy,
+ * shipped unit fixes (e.g. the socket-env change) never take effect after
+ * `mosaic update` until `mosaic fleet install` is re-run. Best-effort + scoped:
+ * only refreshes when a fleet is already installed (the active dir already
+ * carries `mosaic-*` units), so non-fleet hosts are untouched.
+ */
+export function refreshActiveFleetUnits(
+  mosaicHome = join(homedir(), '.config', 'mosaic'),
+  env: NodeJS.ProcessEnv = process.env,
+): { refreshed: string[]; ok: boolean; reason?: string } {
+  const src = join(mosaicHome, 'systemd', 'user');
+  const configHome = env['XDG_CONFIG_HOME'] ?? join(homedir(), '.config');
+  const dest = join(configHome, 'systemd', 'user');
+  if (!existsSync(src)) return { refreshed: [], ok: true };
+  // Only refresh when a fleet is already installed (active dir has mosaic units).
+  const fleetInstalled =
+    existsSync(dest) &&
+    readdirSync(dest).some((f) => f.startsWith('mosaic-') && f.endsWith('.service'));
+  if (!fleetInstalled) return { refreshed: [], ok: true };
+  const units = readdirSync(src).filter((f) => f.startsWith('mosaic-') && f.endsWith('.service'));
+  const refreshed: string[] = [];
+  for (const unit of units) {
+    try {
+      copyFileSync(join(src, unit), join(dest, unit));
+      refreshed.push(unit);
+    } catch {
+      // best-effort per unit
+    }
+  }
+  try {
+    execSync('systemctl --user daemon-reload', { stdio: 'ignore', timeout: 15_000 });
+  } catch {
+    // non-systemd host or no session bus — non-fatal
+  }
+  return { refreshed, ok: true };
+}
+
 /** Build the per-agent systemd relaunch commands (drain+relaunch via restart). */
 export function buildRelaunchCommands(agentNames: string[]): string[][] {
   return agentNames.map((name) => [