feat(fleet): F4 Phase 1 — orchestrator chat connector abstraction + Matrix design (#616)

From the north-star (#613) orchestrator-chat-connector decision: make the
orchestrator's chat channel a pluggable, user-chosen connector (tmux | discord
| matrix peers) and add Matrix (local homeserver) — starting with the small
uniform abstraction so connectors drop in without touching fleet core.

Phase 1 (this PR — design + scaffold):
- src/fleet/connectors/types.ts: OrchestratorConnector interface (send /
  subscribe / health per the Lead's spec) + message/config types; thread-aware
  via optional threadId so Matrix threads + the future first-party Mosaic
  Discord plugin fit without an interface change. 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 (gateway pattern), never the roster.
- docs/fleet/f4-matrix-connector.md: interface, config, Matrix client-server API
  mapping, Conduit-default local homeserver, phasing, back-compat.

Self-contained connectors/ module — NO fleet.ts changes, so independent of the
in-flight stacked fleet-config PR (#615).

Verified: 7 connector tests green; tsc/eslint/prettier/sanitize clean; schema
valid JSON.

Refs #616, #613

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

docs/TASKS.md

@@ -54,3 +54,11 @@ Active workstream is **W1 — Federation v1**. Workers should:
 ## P6 — Docs, compliance matrix, alpha tag (#606) — feat/p6-docs-compliance-alpha
 
 - Status: in-repo deliverables done (CONTRIBUTING.md + harness×gate compliance matrix + check-resident-budget.sh + CI wiring + ALPHA-DOD.md). Remaining: alpha tag v0.0.39-alpha (Lead, post-merge). aiguide reconcile merged (#8). Detail: scratchpads/p6-docs-compliance-alpha.md.
+
+## F3-m3 — mosaic update re-seeds framework + relaunches agents (#609) — feat/f3-m3-update-reseed
+
+- Status: implemented + tested. Closes R13: `mosaic update` now re-seeds the framework (data-safe MOSAIC_SYNC_ONLY) after the CLI install so shipped launcher/runtime changes activate; `--relaunch` restarts rostered agents; `--no-reseed` opts out. Detail: scratchpads/f3-m3-update-reseed.md.
+
+## F4 — Orchestrator chat connector + Matrix (#616) — feat/f4-matrix-connector
+
+- Status: Phase 1 done (abstraction + scaffold). Connector interface (send/subscribe/health) + registry + roster connector schema + design doc; tmux default/back-compat; matrix/discord factories are Phase 2. 7 tests green; no fleet.ts changes (independent of #615). Detail: scratchpads/f4-matrix-connector.md.

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/scratchpads/f3-m3-update-reseed.md

@@ -0,0 +1,29 @@
+# F3-m3 — `mosaic update` re-seeds framework + relaunches agents (R13)
+
+- **Issue:** #609 · **Branch:** `feat/f3-m3-update-reseed`
+
+## Gap (found in 0.0.39 production validation)
+
+`mosaic update` installs the new npm CLI but never re-seeds `~/.config/mosaic/` from the package's
+bundled `framework/`. So the shipped custom Pi harness (agent-name export + native HB, 0.0.39) stays
+DORMANT until a re-seed — operators get the new CLI on a stale framework.
+
+## Implementation
+
+- `update-checker.ts`: `resolveBundledFrameworkRoot()`, `buildReseedCommand()` (install.sh in
+  `MOSAIC_SYNC_ONLY=1 MOSAIC_INSTALL_MODE=keep` — the P4 data-safe reconcile), `runFrameworkReseed()`,
+  `readRosterAgentNames()`, `buildRelaunchCommands()` (systemctl --user restart per agent).
+- `cli.ts` `update`: after a successful CLI install that includes `@mosaicstack/mosaic`, re-seed the
+  framework (default-on; `--no-reseed` to skip). Then either `--relaunch` (restart rostered agents) or
+  print clear guidance to run `mosaic update --relaunch` / `mosaic fleet restart`.
+
+## Flow
+
+`update CLI → re-seed framework (data-safe) → relaunch agents (opt-in)` — closes R13, activates the
+native harness for every operator.
+
+## Verification
+
+- 6 new unit tests (reseed command/env, relaunch commands, roster parse, missing-installer guard).
+- 19 runtime + 26 launch tests still green; tsc/eslint/prettier clean.
+- Data-safety of the sync is already proven (P4 5-fixture matrix + live dragon-lin validation).

docs/scratchpads/f4-matrix-connector.md

@@ -0,0 +1,19 @@
+# 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.

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

@@ -113,6 +113,35 @@
           }
         }
       }
+    },
+    "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/src/cli.ts

@@ -26,6 +26,10 @@ import {
   checkForAllUpdates,
   formatAllPackagesTable,
   getInstallAllCommand,
+  runFrameworkReseed,
+  readRosterAgentNames,
+  buildRelaunchCommands,
+  FRAMEWORK_RESEED_PACKAGE,
 } from './runtime/update-checker.js';
 import { runWizard } from './wizard.js';
 import { ClackPrompter } from './prompter/clack-prompter.js';
@@ -404,7 +408,12 @@ program
   .command('update')
   .description('Check for and install Mosaic CLI updates')
   .option('--check', 'Check only, do not install')
-  .action(async (opts: { check?: boolean }) => {
+  .option(
+    '--no-reseed',
+    'Skip re-seeding framework files into ~/.config/mosaic after the CLI update',
+  )
+  .option('--relaunch', 'Restart durable fleet agents so the new launcher/runtime takes effect')
+  .action(async (opts: { check?: boolean; reseed?: boolean; relaunch?: boolean }) => {
     // checkForAllUpdates imported statically above
     const { execSync } = await import('node:child_process');
 
@@ -442,6 +451,51 @@ program
       console.error('\nUpdate failed. Try manually: bash tools/install.sh');
       process.exit(1);
     }
+
+    // F3-m3 / R13: the CLI is updated, but the framework files in
+    // ~/.config/mosaic/ are still the previous version. Re-seed them from the
+    // freshly-installed package so shipped launcher/runtime changes ACTIVATE.
+    // Only when the framework-bearing package itself updated.
+    const mosaicUpdated = outdated.some(
+      (r: { package: string }) => r.package === FRAMEWORK_RESEED_PACKAGE,
+    );
+    if (mosaicUpdated && opts.reseed !== false) {
+      console.log(
+        '\nRe-seeding framework files into ~/.config/mosaic (data-safe; keeps your edits)…',
+      );
+      const reseed = runFrameworkReseed();
+      if (reseed.ok) {
+        console.log('✔ Framework re-seeded.');
+        const agents = readRosterAgentNames();
+        if (agents.length > 0) {
+          if (opts.relaunch) {
+            console.log(
+              `\nRelaunching ${agents.length} fleet agent(s) to pick up the new runtime…`,
+            );
+            for (const restart of buildRelaunchCommands(agents)) {
+              try {
+                execSync(restart.join(' '), { stdio: 'inherit', timeout: 30_000 });
+              } catch {
+                console.error(`  ⚠ failed to restart agent — run: ${restart.join(' ')}`);
+              }
+            }
+            console.log('✔ Agents relaunched.');
+          } else {
+            console.log(
+              `\nℹ ${agents.length} fleet agent(s) are still running the previous runtime. ` +
+                'Restart them to activate the update:\n    mosaic update --relaunch   ' +
+                '(or: mosaic fleet restart <agent>)',
+            );
+          }
+        }
+      } else {
+        console.error(
+          `\n⚠ Framework re-seed skipped: ${reseed.reason ?? 'unknown'}.\n` +
+            '  Activate manually: bash "$(npm root -g)/@mosaicstack/mosaic/framework/install.sh" ' +
+            '(MOSAIC_SYNC_ONLY=1 MOSAIC_INSTALL_MODE=keep)',
+        );
+      }
+    }
   });
 
 // ─── wizard ─────────────────────────────────────────────────────────────

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

@@ -0,0 +1,85 @@
+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 {
+  buildReseedCommand,
+  buildRelaunchCommands,
+  readRosterAgentNames,
+  runFrameworkReseed,
+} from './update-checker.js';
+
+/**
+ * F3-m3 / R13: `mosaic update` re-seeds the framework + (opt-in) relaunches
+ * durable agents so shipped launcher/runtime changes activate. These cover the
+ * pure builders + the missing-installer guard (the exec path is integration).
+ */
+
+describe('buildReseedCommand', () => {
+  it('invokes the package install.sh in data-safe sync-only keep mode', () => {
+    const out = buildReseedCommand('/pkg/framework', '/home/u/.config/mosaic');
+    expect(out.installer).toBe('/pkg/framework/install.sh');
+    expect(out.command).toBe('bash /pkg/framework/install.sh');
+    expect(out.env).toEqual({
+      MOSAIC_SYNC_ONLY: '1',
+      MOSAIC_INSTALL_MODE: 'keep',
+      MOSAIC_HOME: '/home/u/.config/mosaic',
+    });
+  });
+});
+
+describe('buildRelaunchCommands', () => {
+  it('builds a systemctl --user restart per agent unit', () => {
+    expect(buildRelaunchCommands(['orchestrator', 'coder0'])).toEqual([
+      ['systemctl', '--user', 'restart', 'mosaic-agent@orchestrator.service'],
+      ['systemctl', '--user', 'restart', 'mosaic-agent@coder0.service'],
+    ]);
+  });
+
+  it('is empty for an empty roster', () => {
+    expect(buildRelaunchCommands([])).toEqual([]);
+  });
+});
+
+describe('readRosterAgentNames', () => {
+  let home: string;
+
+  beforeEach(() => {
+    home = mkdtempSync(join(tmpdir(), 'mosaic-roster-'));
+  });
+  afterEach(() => {
+    rmSync(home, { recursive: true, force: true });
+  });
+
+  it('returns [] when no roster exists', () => {
+    expect(readRosterAgentNames(home)).toEqual([]);
+  });
+
+  it('extracts agent names from roster.yaml', () => {
+    mkdirSync(join(home, 'fleet'), { recursive: true });
+    writeFileSync(
+      join(home, 'fleet', 'roster.yaml'),
+      [
+        'version: 1',
+        'agents:',
+        '  - name: orchestrator',
+        '    runtime: pi',
+        '  - name: coder0',
+        '    runtime: claude',
+        '  - name: "reviewer-1"',
+        '    runtime: codex',
+      ].join('\n') + '\n',
+    );
+    expect(readRosterAgentNames(home)).toEqual(['orchestrator', 'coder0', 'reviewer-1']);
+  });
+});
+
+describe('runFrameworkReseed', () => {
+  it('reports not-ok (not throw) when the installer is absent', () => {
+    const missing = mkdtempSync(join(tmpdir(), 'mosaic-noinstaller-'));
+    const res = runFrameworkReseed(missing, join(missing, 'home'));
+    expect(res.ok).toBe(false);
+    expect(res.reason).toContain('installer not found');
+    rmSync(missing, { recursive: true, force: true });
+  });
+});

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

@@ -16,7 +16,8 @@
 import { execSync } from 'node:child_process';
 import { existsSync, mkdirSync, readFileSync, writeFileSync } from 'node:fs';
 import { homedir } from 'node:os';
-import { join } from 'node:path';
+import { dirname, join, resolve } from 'node:path';
+import { fileURLToPath } from 'node:url';
 
 // ─── Types ──────────────────────────────────────────────────────────────────
 
@@ -453,6 +454,98 @@ export function getInstallAllCommand(outdated: PackageUpdateResult[]): string {
   return `npm i -g ${pkgs.join(' ')}`;
 }
 
+// ─── Post-update framework re-seed + agent relaunch (F3-m3 / R13) ─────────────
+//
+// `mosaic update` installs the new npm CLI but, on its own, leaves the framework
+// files in ~/.config/mosaic/ stale — so shipped launcher/runtime changes (e.g.
+// the agent-name export + native heartbeat) never ACTIVATE until a re-seed.
+// These helpers run the package's own install.sh in sync-only mode (the P4
+// data-safe reconcile: framework-owned overwrite + backup-once; SOUL/USER/
+// *.local/credentials preserved) and, opt-in, relaunch durable agents.
+
+/** Resolve the framework/ directory bundled in the installed package. */
+export function resolveBundledFrameworkRoot(): string {
+  // dist/runtime/update-checker.js → ../../framework (package files: dist + framework)
+  return resolve(dirname(fileURLToPath(import.meta.url)), '..', '..', 'framework');
+}
+
+export const FRAMEWORK_RESEED_PACKAGE = PKG;
+
+/**
+ * Build the framework re-seed invocation: the package's install.sh in
+ * sync-only mode (file phase only — no environment-touching post-install),
+ * keep mode (never overwrite user files). Returned as data so it is unit
+ * testable; `runFrameworkReseed` executes it.
+ */
+export function buildReseedCommand(
+  frameworkRoot: string,
+  mosaicHome: string,
+): { installer: string; command: string; env: Record<string, string> } {
+  const installer = join(frameworkRoot, 'install.sh');
+  return {
+    installer,
+    command: `bash ${installer}`,
+    env: {
+      MOSAIC_SYNC_ONLY: '1',
+      MOSAIC_INSTALL_MODE: 'keep',
+      MOSAIC_HOME: mosaicHome,
+    },
+  };
+}
+
+/**
+ * Re-seed the framework from the freshly-installed package. Returns a result
+ * describing what happened (so callers can message + decide on relaunch).
+ * Best-effort: a missing installer or a non-zero exit is reported, not thrown.
+ */
+export function runFrameworkReseed(
+  frameworkRoot = resolveBundledFrameworkRoot(),
+  mosaicHome = join(homedir(), '.config', 'mosaic'),
+): { ok: boolean; reason?: string } {
+  const { installer, command, env } = buildReseedCommand(frameworkRoot, mosaicHome);
+  if (!existsSync(installer)) {
+    return { ok: false, reason: `installer not found: ${installer}` };
+  }
+  try {
+    execSync(command, { stdio: 'inherit', env: { ...process.env, ...env }, timeout: 120_000 });
+    return { ok: true };
+  } catch (err) {
+    return { ok: false, reason: err instanceof Error ? err.message : String(err) };
+  }
+}
+
+/**
+ * Best-effort parse of the fleet roster for agent names (used to relaunch
+ * durable agents after a re-seed). Returns [] when no roster exists.
+ */
+export function readRosterAgentNames(mosaicHome = join(homedir(), '.config', 'mosaic')): string[] {
+  const rosterPath = join(mosaicHome, 'fleet', 'roster.yaml');
+  if (!existsSync(rosterPath)) return [];
+  let text: string;
+  try {
+    text = readFileSync(rosterPath, 'utf-8');
+  } catch {
+    return [];
+  }
+  // Roster agents are listed as `- name: <id>` entries under `agents:`.
+  const names: string[] = [];
+  for (const line of text.split('\n')) {
+    const m = line.match(/^\s*-?\s*name:\s*["']?([A-Za-z0-9._-]+)["']?\s*$/);
+    if (m && m[1]) names.push(m[1]);
+  }
+  return names;
+}
+
+/** Build the per-agent systemd relaunch commands (drain+relaunch via restart). */
+export function buildRelaunchCommands(agentNames: string[]): string[][] {
+  return agentNames.map((name) => [
+    'systemctl',
+    '--user',
+    'restart',
+    `mosaic-agent@${name}.service`,
+  ]);
+}
+
 /**
  * Format a table showing all packages with their current/latest versions.
  */