fix(macp): fail-closed typed gate states — no placeholder/empty-command passes (#1275 )

RI-N2 / SDLC-D-035. Every GateResult now carries a typed status discriminator (passed|failed|simulated|waiting|capability_failure); passed:true remains true only for really-executed, really-green gates. - ci-pipeline without a CI provider → capability_failure (MACP_NO_CI_PIPELINE), never the placeholder pass - empty-command gate → capability_failure (MACP_NO_COMMAND / MACP_NO_REVIEWER), and runGates no longer silently skips it - manual gate type waits (MACP_AUTHORITY_REQUIRED) — neither pass nor fail - explicit simulation only (simulate option / --simulate): typed simulated results can never make the aggregate passed (RunGatesResult.state) - CLI stubs (tasks list, submit, events tail) exit nonzero with typed MACP_NOT_IMPLEMENTED; macp gate is now wired to runGates with --simulate - legacy __tests__/gate-runner.test.ts consolidated into src/gate-runner.spec.ts (root eslint project service does not cover packages/macp/__tests__)
Merge pull request 'fix(ci): unwire test-start-agent-session.sh, restore its signed exclusion — unblocks every PR on next' (#1270 ) from fix/1269-ci-chain-unblock into next
2026-08-17 16:40:16 -05:00 · 2026-08-17 20:44:59 +00:00 · 2026-08-16 18:03:02 -05:00 · 2026-08-16 17:58:49 -05:00
26 changed files with 1049 additions and 1683 deletions
@@ -115,19 +115,18 @@ gateway-backed agent catalog.

 ### Normative requirements

-| ID           | Requirement                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
-| ------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
-| `FCM-REQ-01` | The roster SHALL be the sole writable desired-state source for local fleet membership, launch policy, and persisted lifecycle target. Generated environment files, systemd enablement, tmux sessions, and heartbeat state SHALL be non-authoritative projections.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
-| `FCM-REQ-02` | The implementation SHALL provide one executable structural contract for YAML/JSON input and one shared semantic validator. Roster load, profile validation, provision, migration, and apply SHALL reuse the existing baseline-plus-`roles.local` profile/persona resolver; a parallel role resolver is forbidden.                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
-| `FCM-REQ-03` | The local fleet CLI SHALL expose documented programmatic validate, show, plan, apply/reconcile, create, inspect, update, delete, start, stop, restart, status, verify, and doctor operations with stable JSON and exit-code behavior. Existing `fleet add/remove` compatibility aliases may remain during the stated deprecation window.                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
-| `FCM-REQ-04` | A fresh create SHALL persist `enabled:true` and `desired_state:stopped` unless an explicit persisted start is requested. The model SHALL distinguish enabled state, persisted desired state, and observed state. Migration, apply, reboot, and rollback SHALL not start an agent that was observed stopped before cutover.                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
-| `FCM-REQ-05` | The launch chain SHALL consume deterministic, digest-stamped generated input only. Optional local overrides SHALL be parsed as strict data, may not shadow authoritative generated keys, and may not contain arbitrary commands, credential values, channels, or unknown `MOSAIC_AGENT_*` keys. Forbidden legacy keys, including `MOSAIC_AGENT_COMMAND`, SHALL be privately quarantined before launch and reported only by key name and content hash.                                                                                                                                                                                                                                                                                                                                       |
-| `FCM-REQ-06` | Mutations and apply SHALL validate before mutation, use an expected generation/lock, write projections atomically, produce a deterministic plan, and emit recovery information on partial failure. Reconciliation SHALL act only on local, enabled, roster-owned projections and SHALL not kill unmanaged tmux sessions by fuzzy name.                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
-| `FCM-REQ-07` | Canonical required classes are `code`, `review`, `validator`, `orchestrator`, `team-leader`, `enhancer`, and `interaction`. `validator` issues an independent final certificate but has no merge authority; `merge-gate` remains sole approve-to-land/merge authority. Team-leader capacity is bounded by an orchestrator-issued lease, and interaction is request/status only. Tess and Ultron are configurable instance/display names, not required machine identities.                                                                                                                                                                                                                                                                                                                   |
-| `FCM-REQ-08` | v1 migration SHALL be field-complete, reversible, and explicit about aliases, unresolved classes, lifecycle inference, generated-file regeneration, local override quarantine, schema-only remote/connector fields, and rollback. Every shipped example, profile, and service preset SHALL be migrated and executable, retained as an explicitly versioned v1 fixture, or retired with a replacement and deprecation note.                                                                                                                                                                                                                                                                                                                                                                  |
-| `FCM-REQ-09` | M1–M5 SHALL remain local tmux/systemd control-plane work. Remote/SSH reconciliation, connector mutation, secret references, arbitrary command/channel overrides, gateway/API convergence, and UI configuration storage are excluded and require a separate PRD/threat model.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
-| `FCM-REQ-10` | Documentation and examples are delivery gates. The M0 checklist at [docs/fleet/FLEET-CONFIG-DOCS-IA-CHECKLIST.md](./fleet/FLEET-CONFIG-DOCS-IA-CHECKLIST.md) and the baseline disposition inventory at [docs/fleet/LEGACY-EXAMPLE-PROFILE-DISPOSITION-INVENTORY.md](./fleet/LEGACY-EXAMPLE-PROFILE-DISPOSITION-INVENTORY.md) SHALL be maintained as acceptance evidence.                                                                                                                                                                                                                                                                                                                                                                                                                    |
-| `FCM-REQ-11` | Fleet provisioning SHALL validate the fleet CLI and distinct runtimes requested by the roster against the exact PATH construction used by the runtime pane, through one shared implementation rather than the operator PATH or a parallel PATH model. Name resolution alone is insufficient: a resolved script's shebang interpreter SHALL also be reachable, and Node SHALL execute a side-effect-free version probe when it is that interpreter. `fleet install` and `install-systemd` SHALL fail before installation effects when a required executable is absent or unreachable. `fleet doctor` SHALL emit the same named checks as non-green evidence. Every runtime failure SHALL name the runtime, all requesting roster rows, the pane PATH searched, and an exact install command. |
+| ID           | Requirement                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
+| ------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| `FCM-REQ-01` | The roster SHALL be the sole writable desired-state source for local fleet membership, launch policy, and persisted lifecycle target. Generated environment files, systemd enablement, tmux sessions, and heartbeat state SHALL be non-authoritative projections.                                                                                                                                                                                                         |
+| `FCM-REQ-02` | The implementation SHALL provide one executable structural contract for YAML/JSON input and one shared semantic validator. Roster load, profile validation, provision, migration, and apply SHALL reuse the existing baseline-plus-`roles.local` profile/persona resolver; a parallel role resolver is forbidden.                                                                                                                                                         |
+| `FCM-REQ-03` | The local fleet CLI SHALL expose documented programmatic validate, show, plan, apply/reconcile, create, inspect, update, delete, start, stop, restart, status, verify, and doctor operations with stable JSON and exit-code behavior. Existing `fleet add/remove` compatibility aliases may remain during the stated deprecation window.                                                                                                                                  |
+| `FCM-REQ-04` | A fresh create SHALL persist `enabled:true` and `desired_state:stopped` unless an explicit persisted start is requested. The model SHALL distinguish enabled state, persisted desired state, and observed state. Migration, apply, reboot, and rollback SHALL not start an agent that was observed stopped before cutover.                                                                                                                                                |
+| `FCM-REQ-05` | The launch chain SHALL consume deterministic, digest-stamped generated input only. Optional local overrides SHALL be parsed as strict data, may not shadow authoritative generated keys, and may not contain arbitrary commands, credential values, channels, or unknown `MOSAIC_AGENT_*` keys. Forbidden legacy keys, including `MOSAIC_AGENT_COMMAND`, SHALL be privately quarantined before launch and reported only by key name and content hash.                     |
+| `FCM-REQ-06` | Mutations and apply SHALL validate before mutation, use an expected generation/lock, write projections atomically, produce a deterministic plan, and emit recovery information on partial failure. Reconciliation SHALL act only on local, enabled, roster-owned projections and SHALL not kill unmanaged tmux sessions by fuzzy name.                                                                                                                                    |
+| `FCM-REQ-07` | Canonical required classes are `code`, `review`, `validator`, `orchestrator`, `team-leader`, `enhancer`, and `interaction`. `validator` issues an independent final certificate but has no merge authority; `merge-gate` remains sole approve-to-land/merge authority. Team-leader capacity is bounded by an orchestrator-issued lease, and interaction is request/status only. Tess and Ultron are configurable instance/display names, not required machine identities. |
+| `FCM-REQ-08` | v1 migration SHALL be field-complete, reversible, and explicit about aliases, unresolved classes, lifecycle inference, generated-file regeneration, local override quarantine, schema-only remote/connector fields, and rollback. Every shipped example, profile, and service preset SHALL be migrated and executable, retained as an explicitly versioned v1 fixture, or retired with a replacement and deprecation note.                                                |
+| `FCM-REQ-09` | M1–M5 SHALL remain local tmux/systemd control-plane work. Remote/SSH reconciliation, connector mutation, secret references, arbitrary command/channel overrides, gateway/API convergence, and UI configuration storage are excluded and require a separate PRD/threat model.                                                                                                                                                                                              |
+| `FCM-REQ-10` | Documentation and examples are delivery gates. The M0 checklist at [docs/fleet/FLEET-CONFIG-DOCS-IA-CHECKLIST.md](./fleet/FLEET-CONFIG-DOCS-IA-CHECKLIST.md) and the baseline disposition inventory at [docs/fleet/LEGACY-EXAMPLE-PROFILE-DISPOSITION-INVENTORY.md](./fleet/LEGACY-EXAMPLE-PROFILE-DISPOSITION-INVENTORY.md) SHALL be maintained as acceptance evidence.                                                                                                  |

 ### Acceptance criteria

@@ -139,7 +138,6 @@ gateway-backed agent catalog.
 6. `AC-FCM-06`: A v1 roster migration previews field-by-field disposition, preserves observed stopped/running state, inventories rather than reconciles remote/schema-only entries, supports a canary and rollback, and classifies every shipped example, profile, and service preset according to the M0 inventory.
 7. `AC-FCM-07`: Required role authority is validated: validator certificate is consumed but does not merge, merge-gate is the sole merge authority, team-leader leases do not change roster/credentials/authority, and interaction/Tess cannot claim orchestration or merge powers.
 8. `AC-FCM-08`: Documentation, examples, migration, troubleshooting, operational recovery, package/update asset drift, schema/example/profile validation, independent code/security review, validator certificate, and terminal-green CI are complete before #758 closes.
-9. `AC-FCM-09`: Red-first isolated tests create (a) a roster whose runtime exists on the operator PATH but is absent from the constructed pane PATH and (b) a greenfield pane where `mosaic` and a runtime resolve as Node-shebang scripts while Node is absent. They prove `fleet install` fails before effects, the launcher creates no doomed session, and `fleet doctor` reports named non-green checks. Diagnostics include the executable or runtime, all requesting rows, searched pane PATH, shebang dependency when present, and exact runtime install command; repeated rows are checked once per distinct runtime/effective pane path. Tests use temporary `--mosaic-home` state and fixture binaries, never host runtime mutation.

 ### M0 implementation gate

@@ -59,28 +59,6 @@ valid allowed local data can move to `.env.local`; invalid legacy input is priva
 Diagnostics expose only rule code, key name, and a SHA-256 content hash. They do not reveal command
 text, credentials, or other values.

-## Pane executable preflight
-
-The fleet install, install-systemd, and doctor commands plus the session launcher use
-**pane-runtime-path.sh** as the single pane-PATH implementation. Install inspects every distinct
-roster runtime and effective MOSAIC_RUNTIME_BIN pair before creating holder identity, tool,
-projection, or unit files. Doctor reports the same checks as JSON.
-
-A resolved command is not automatically executable. The helper reads a script shebang, unwraps the
-common “/usr/bin/env node” and “/usr/bin/env -S node …” forms, then resolves the declared command
-against the pane PATH. When Node is the declared interpreter, the helper runs the side-effect-free
-“node --version” probe. It does not run “mosaic --version”, whose startup update check can write cache
-state. Native binaries have no PATH-resolved shebang dependency and retain their normal executable
-check. Failures name the executable or runtime, requesting roster rows, searched pane PATH,
-dependency, and runtime install command.
-
-Supported runtime install commands are:
-
- **Claude:** curl -fsSL https://claude.ai/install.sh | bash
- **Codex:** npm install -g @openai/codex
- **OpenCode:** npm install -g opencode-ai
- **Pi:** npm install -g @earendil-works/pi-coding-agent
-
 ## Launch and stop behavior

 The launcher obtains the agent's socket only from the validated generated projection. It creates or
@@ -1,71 +0,0 @@
-# #1256 — Fleet runtime preflight
-
-**Agent:** tiny
-
-**Branch:** `fix/1256-fleet-runtime-preflight` from `origin/next@476db12b92971634b67fd2057b7577ee5894e449`
-
-**Issue:** `mosaicstack/stack#1256` blocker 1
-
-**Adjacent PR:** `#1258` (`fix/1256-fleet-pane-path-node`) owns the bootstrapped-Node candidate and must remain a separate change
-
-**Budget:** 30K-token soft cap; one bounded implementation lane
-
-## Objective
-
-Make fleet provisioning fail before installation effects when the roster names a runtime binary absent from the exact PATH the tmux pane will receive. Make `mosaic fleet doctor` report the same named runtime check. Diagnostics must name the runtime, every requesting roster row, the pane PATH searched, and an exact install command.
-
-For Pi the exact command is:
-
-```text
-npm install -g @earendil-works/pi-coding-agent
-```
-
-## Constraints
-
- TDD: add the failing behavior test and capture RED before implementation.
- Runtime resolution uses the launcher's pane-PATH construction; a second PATH model is forbidden.
- Operator PATH is non-authoritative and must not cause a false pass.
- Tests use an isolated `--mosaic-home`/temporary HOME and never mutate host runtime binaries.
- No install, removal, or binary-resolution changes on sb-it-1-dt.
- PR targets `next` and requires a reviewer other than fred.
- Commit identity is `tiny <[email protected]>`.
- #1258's Node candidate is a dependency/adjacent change, never reimplemented here.
-
-## Planned seam
-
-1. Factor the shell pane-path builder/resolver into one sourceable and executable fleet helper.
-2. Have `start-agent-session.sh` source that helper, preserving one definition of the pane PATH.
-3. Have the TypeScript fleet command invoke the same helper under the unit-equivalent clean launcher environment.
-4. Group roster rows by distinct runtime and effective pane PATH, then report requesting row names.
-5. Run the preflight before `installFleet` performs any write.
-6. Add the named result to roster-v2 `fleet doctor` JSON and set a failing exit when a runtime is absent.
-7. Install/copy the helper alongside `start-agent-session.sh` and update framework manifest/docs as required.
-
-This seam overlaps #1258 only at the location of the existing shell function. Development may use #1258 as a local dependency, but the final PR diff must exclude #1258's separately owned Node change after that PR lands or after an agreed rebase order.
-
-## Acceptance evidence
-
-| Requirement | Evidence |
-|---|---|
-| Missing Pi blocks install before effects | isolated CLI test: nonzero + no installed files/runner effects |
-| Operator PATH cannot create false green | test puts Pi only on operator PATH and omits it from constructed pane PATH |
-| Exact pane PATH reused | launcher and CLI call one shared shell helper; contract test exercises both |
-| Actionable diagnosis | runtime + roster rows + searched PATH + exact install command assertions |
-| Distinct runtimes | repeated rows produce one check with all row names |
-| Doctor reports named check | JSON assertion + nonzero exit for missing runtime |
-| Present runtime passes | isolated pane-path fixture with executable binary |
-| No host mutation | tests use temporary HOME/Mosaic home and fixture binaries only |
-| Baseline safety | focused tests, package typecheck/lint/format, full relevant suite, CI |
-
-## Progress log
-
- 2026-08-16: Dispatch received from fred; issue #1256 and PR #1258 measured.
- 2026-08-16: Fresh clone created under `~/agent-work/tiny-fleet-runtime-preflight`; local Git identity pinned to tiny so retired global `mos-dt-0` identity cannot win.
- 2026-08-16: Design inspection found the pane PATH exists only inside `start-agent-session.sh`; the right seam is a shared shell helper rather than a parallel TypeScript reconstruction.
- 2026-08-16: RED measured on `origin/next@476db12b`: focused `fleet-roster-v2-dispatch.spec.ts` ran 11 tests; the new case failed because install returned success, wrote units for two agents, and emitted no `runtime=pi` diagnosis while Pi existed only on operator PATH.
- 2026-08-16: Factored pane home/PATH/resolution into sourceable and executable `pane-runtime-path.sh`; install invokes it before the first effect, doctor emits the same named checks, and the launcher sources it.
- 2026-08-16: Fred/rhodey review exposed the #1241 name-resolution blind spot: `mosaic` can resolve while its `#!/usr/bin/env node` interpreter cannot. Measurement confirmed every supported current Mosaic package shape is a Node-shebang script, but executing `mosaic --version` is not observational because CLI startup runs the cache-writing/network update checker before Commander handles the flag.
- 2026-08-16: Final executable check reads and unwraps direct and `/usr/bin/env` shebangs (including `env -S`), resolves the declared dependency against pane PATH, and runs only side-effect-free `node --version` when Node is declared. Native binaries do not inherit a permanent Node requirement. Install, doctor, and launcher share this implementation.
- 2026-08-16: Isolated greenfield fixture places resolved Mosaic and Pi Node-shebang scripts in pane-visible npm-global bin while using an empty system suffix; both checks become `unexecutable` with `dependency=node`, and install leaves holder/tools/units absent. No host binary or HOME is changed.
- 2026-08-16: GREEN evidence before #1258 rebase: focused install/doctor/preflight suites pass; `fleet.spec.ts` 209/209; full Vitest 87 files / 1,557 tests; launcher shell suite, typecheck, lint, build, and focused format check pass. Full framework-shell reaches an unrelated host-measurement drift in unchanged `invariant_r_unittest.py` (expected Pi 0.84.1, host resolves 0.84.2); no invariant was changed in this lane.
- 2026-08-16: Merge-order gate remains: `origin/next` is still `476db12b`; #1258 is unmerged at `6dc35e5`. Rebase after it lands, relocate its Node candidate into the helper with explicit provenance, rerun gates, then open the PR to `next` for an independent non-fred review.
@@ -1,253 +0,0 @@
-import { mkdirSync, readFileSync, rmSync } from 'node:fs';
-import { join } from 'node:path';
-import { tmpdir } from 'node:os';
-import { randomUUID } from 'node:crypto';
-import { describe, it, expect, beforeEach, afterEach } from 'vitest';
-import { normalizeGate, countAIFindings, runGate, runGates } from '../src/gate-runner.js';
-
-function makeTmpDir(): string {
-  const dir = join(tmpdir(), `macp-gate-${randomUUID()}`);
-  mkdirSync(dir, { recursive: true });
-  return dir;
-}
-
-describe('normalizeGate', () => {
-  it('normalizes a string to mechanical gate', () => {
-    expect(normalizeGate('echo test')).toEqual({
-      command: 'echo test',
-      type: 'mechanical',
-      fail_on: 'blocker',
-    });
-  });
-
-  it('normalizes an object gate with defaults', () => {
-    expect(normalizeGate({ command: 'lint' })).toEqual({
-      command: 'lint',
-      type: 'mechanical',
-      fail_on: 'blocker',
-    });
-  });
-
-  it('preserves explicit type and fail_on', () => {
-    expect(normalizeGate({ command: 'review', type: 'ai-review', fail_on: 'any' })).toEqual({
-      command: 'review',
-      type: 'ai-review',
-      fail_on: 'any',
-    });
-  });
-
-  it('handles non-string/non-object input', () => {
-    expect(normalizeGate(42)).toEqual({ command: '', type: 'mechanical', fail_on: 'blocker' });
-    expect(normalizeGate(null)).toEqual({ command: '', type: 'mechanical', fail_on: 'blocker' });
-  });
-});
-
-describe('countAIFindings', () => {
-  it('returns zeros for non-object', () => {
-    expect(countAIFindings(null)).toEqual({ blockers: 0, total: 0 });
-    expect(countAIFindings('string')).toEqual({ blockers: 0, total: 0 });
-    expect(countAIFindings([])).toEqual({ blockers: 0, total: 0 });
-  });
-
-  it('counts from stats block', () => {
-    const output = { stats: { blockers: 2, should_fix: 3, suggestions: 1 } };
-    expect(countAIFindings(output)).toEqual({ blockers: 2, total: 6 });
-  });
-
-  it('counts from findings array when stats has no blockers', () => {
-    const output = {
-      stats: { blockers: 0 },
-      findings: [{ severity: 'blocker' }, { severity: 'warning' }, { severity: 'blocker' }],
-    };
-    expect(countAIFindings(output)).toEqual({ blockers: 2, total: 3 });
-  });
-
-  it('uses stats blockers over findings array when stats has blockers', () => {
-    const output = {
-      stats: { blockers: 5 },
-      findings: [{ severity: 'blocker' }, { severity: 'warning' }],
-    };
-    // stats.blockers = 5, total from stats = 5+0+0 = 5, findings not used for total since stats total is non-zero
-    expect(countAIFindings(output)).toEqual({ blockers: 5, total: 5 });
-  });
-
-  it('counts findings length as total when stats has zero total', () => {
-    const output = {
-      findings: [{ severity: 'warning' }, { severity: 'info' }],
-    };
-    expect(countAIFindings(output)).toEqual({ blockers: 0, total: 2 });
-  });
-});
-
-describe('runGate', () => {
-  let tmp: string;
-  let logPath: string;
-
-  beforeEach(() => {
-    tmp = makeTmpDir();
-    logPath = join(tmp, 'gate.log');
-  });
-
-  afterEach(() => {
-    rmSync(tmp, { recursive: true, force: true });
-  });
-
-  it('passes mechanical gate on exit 0', () => {
-    const result = runGate('echo hello', tmp, logPath, 30);
-    expect(result.passed).toBe(true);
-    expect(result.exit_code).toBe(0);
-    expect(result.type).toBe('mechanical');
-    expect(result.output).toContain('hello');
-  });
-
-  it('fails mechanical gate on non-zero exit', () => {
-    const result = runGate('exit 1', tmp, logPath, 30);
-    expect(result.passed).toBe(false);
-    expect(result.exit_code).toBe(1);
-  });
-
-  it('ci-pipeline always passes', () => {
-    const result = runGate({ command: 'anything', type: 'ci-pipeline' }, tmp, logPath, 30);
-    expect(result.passed).toBe(true);
-    expect(result.type).toBe('ci-pipeline');
-    expect(result.output).toBe('CI pipeline gate placeholder');
-  });
-
-  it('empty command passes', () => {
-    const result = runGate({ command: '' }, tmp, logPath, 30);
-    expect(result.passed).toBe(true);
-  });
-
-  it('ai-review gate parses JSON output', () => {
-    const json = JSON.stringify({ stats: { blockers: 0, should_fix: 1 } });
-    const result = runGate({ command: `echo '${json}'`, type: 'ai-review' }, tmp, logPath, 30);
-    expect(result.passed).toBe(true);
-    expect(result.blockers).toBe(0);
-    expect(result.findings).toBe(1);
-  });
-
-  it('ai-review gate fails on blockers', () => {
-    const json = JSON.stringify({ stats: { blockers: 2 } });
-    const result = runGate({ command: `echo '${json}'`, type: 'ai-review' }, tmp, logPath, 30);
-    expect(result.passed).toBe(false);
-    expect(result.blockers).toBe(2);
-  });
-
-  it('ai-review gate with fail_on=any fails on any findings', () => {
-    const json = JSON.stringify({ stats: { blockers: 0, should_fix: 1 } });
-    const result = runGate(
-      { command: `echo '${json}'`, type: 'ai-review', fail_on: 'any' },
-      tmp,
-      logPath,
-      30,
-    );
-    expect(result.passed).toBe(false);
-    expect(result.fail_on).toBe('any');
-  });
-
-  it('ai-review gate fails on invalid JSON output', () => {
-    const result = runGate({ command: 'echo "not json"', type: 'ai-review' }, tmp, logPath, 30);
-    expect(result.passed).toBe(false);
-    expect(result.parse_error).toBeDefined();
-  });
-
-  it('writes to log file', () => {
-    runGate('echo logged', tmp, logPath, 30);
-    const log = readFileSync(logPath, 'utf-8');
-    expect(log).toContain('COMMAND: echo logged');
-    expect(log).toContain('logged');
-    expect(log).toContain('EXIT:');
-  });
-});
-
-describe('runGates', () => {
-  let tmp: string;
-  let logPath: string;
-  let eventsPath: string;
-
-  beforeEach(() => {
-    tmp = makeTmpDir();
-    logPath = join(tmp, 'gates.log');
-    eventsPath = join(tmp, 'events.ndjson');
-  });
-
-  afterEach(() => {
-    rmSync(tmp, { recursive: true, force: true });
-  });
-
-  it('runs multiple gates and returns results', () => {
-    const { allPassed, gateResults } = runGates(
-      ['echo one', 'echo two'],
-      tmp,
-      logPath,
-      30,
-      eventsPath,
-      'task-1',
-    );
-    expect(allPassed).toBe(true);
-    expect(gateResults).toHaveLength(2);
-  });
-
-  it('reports failure when any gate fails', () => {
-    const { allPassed, gateResults } = runGates(
-      ['echo ok', 'exit 1'],
-      tmp,
-      logPath,
-      30,
-      eventsPath,
-      'task-2',
-    );
-    expect(allPassed).toBe(false);
-    expect(gateResults[0]!.passed).toBe(true);
-    expect(gateResults[1]!.passed).toBe(false);
-  });
-
-  it('emits events for each gate', () => {
-    runGates(['echo test'], tmp, logPath, 30, eventsPath, 'task-3');
-    const events = readFileSync(eventsPath, 'utf-8')
-      .trim()
-      .split('\n')
-      .map((l) => JSON.parse(l));
-    expect(events).toHaveLength(2); // started + passed
-    expect(events[0].event_type).toBe('rail.check.started');
-    expect(events[1].event_type).toBe('rail.check.passed');
-  });
-
-  it('skips gates with empty command (non ci-pipeline)', () => {
-    const { gateResults } = runGates(
-      [{ command: '', type: 'mechanical' }, 'echo real'],
-      tmp,
-      logPath,
-      30,
-      eventsPath,
-      'task-4',
-    );
-    expect(gateResults).toHaveLength(1);
-  });
-
-  it('does not skip ci-pipeline even with empty command', () => {
-    const { gateResults } = runGates(
-      [{ command: '', type: 'ci-pipeline' }],
-      tmp,
-      logPath,
-      30,
-      eventsPath,
-      'task-5',
-    );
-    expect(gateResults).toHaveLength(1);
-    expect(gateResults[0]!.passed).toBe(true);
-  });
-
-  it('emits failed event with correct message', () => {
-    runGates(['exit 42'], tmp, logPath, 30, eventsPath, 'task-6');
-    const events = readFileSync(eventsPath, 'utf-8')
-      .trim()
-      .split('\n')
-      .map((l) => JSON.parse(l));
-    const failEvent = events.find(
-      (e: Record<string, unknown>) => e.event_type === 'rail.check.failed',
-    );
-    expect(failEvent).toBeDefined();
-    expect(failEvent.message).toContain('Gate failed (');
-  });
-});
@@ -1,5 +1,8 @@
-import { describe, it, expect } from 'vitest';
+import { describe, it, expect, afterEach, beforeEach, vi } from 'vitest';
 import { Command } from 'commander';
+import fs from 'node:fs';
+import os from 'node:os';
+import path from 'node:path';
 import { registerMacpCommand } from './cli.js';

 describe('registerMacpCommand', () => {
@@ -75,3 +78,162 @@ describe('registerMacpCommand', () => {
    expect(topLevel).toContain('events');
  });
 });
+
+/**
+ * RI-N2 fail-closed CLI behavior: an unimplemented capability is a failure,
+ * never a success. Every stub exits nonzero with a typed message, and the
+ * implemented `macp gate` mirrors the typed gate-runner states.
+ */
+describe('registerMacpCommand fail-closed (RI-N2)', () => {
+  let tmpDir: string;
+
+  function buildProgram(): Command {
+    const program = new Command();
+    program.exitOverride();
+    program.configureOutput({ writeErr: () => {} });
+    registerMacpCommand(program);
+    return program;
+  }
+
+  beforeEach(() => {
+    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'macp-cli-failclosed-'));
+    process.exitCode = 0;
+  });
+
+  afterEach(() => {
+    process.exitCode = 0;
+    fs.rmSync(tmpDir, { recursive: true, force: true });
+  });
+
+  it('macp tasks list exits nonzero (unimplemented capability)', async () => {
+    const program = buildProgram();
+    await program.parseAsync(['macp', 'tasks', 'list'], { from: 'user' });
+    expect(process.exitCode).not.toBe(0);
+  });
+
+  it('macp submit exits nonzero with a typed MACP_NOT_IMPLEMENTED message', async () => {
+    const program = buildProgram();
+    const errSpy = vi.spyOn(console, 'error').mockImplementation(() => {});
+    try {
+      await program.parseAsync(['macp', 'submit', 'spec.json'], { from: 'user' });
+      expect(process.exitCode).not.toBe(0);
+      const errText = errSpy.mock.calls.map((c) => String(c[0])).join('\n');
+      expect(errText).toContain('MACP_NOT_IMPLEMENTED');
+    } finally {
+      errSpy.mockRestore();
+    }
+  });
+
+  it('macp events tail exits nonzero (unimplemented capability)', async () => {
+    const program = buildProgram();
+    await program.parseAsync(['macp', 'events', 'tail'], { from: 'user' });
+    expect(process.exitCode).not.toBe(0);
+  });
+
+  it('macp gate runs a green inline command and exits 0', async () => {
+    const program = buildProgram();
+    await program.parseAsync(
+      [
+        'macp',
+        'gate',
+        'exit 0',
+        '--cwd',
+        tmpDir,
+        '--log',
+        path.join(tmpDir, 'g.log'),
+        '--timeout',
+        '10',
+      ],
+      { from: 'user' },
+    );
+    expect(process.exitCode).toBe(0);
+  });
+
+  it('macp gate exits nonzero on a failing command', async () => {
+    const program = buildProgram();
+    await program.parseAsync(
+      [
+        'macp',
+        'gate',
+        'exit 9',
+        '--cwd',
+        tmpDir,
+        '--log',
+        path.join(tmpDir, 'g.log'),
+        '--timeout',
+        '10',
+      ],
+      { from: 'user' },
+    );
+    expect(process.exitCode).not.toBe(0);
+  });
+
+  it('macp gate with an unimplemented ci-pipeline capability exits nonzero', async () => {
+    const program = buildProgram();
+    const specPath = path.join(tmpDir, 'gates.json');
+    fs.writeFileSync(specPath, JSON.stringify([{ type: 'ci-pipeline' }]));
+    await program.parseAsync(
+      [
+        'macp',
+        'gate',
+        specPath,
+        '--cwd',
+        tmpDir,
+        '--log',
+        path.join(tmpDir, 'g.log'),
+        '--timeout',
+        '10',
+      ],
+      { from: 'user' },
+    );
+    expect(process.exitCode).not.toBe(0);
+  });
+
+  it('macp gate --simulate completes (exit 0) but reports simulated results', async () => {
+    const program = buildProgram();
+    const logSpy = vi.spyOn(console, 'log').mockImplementation(() => {});
+    try {
+      await program.parseAsync(
+        [
+          'macp',
+          'gate',
+          'exit 0',
+          '--simulate',
+          '--cwd',
+          tmpDir,
+          '--log',
+          path.join(tmpDir, 'g.log'),
+          '--timeout',
+          '10',
+        ],
+        { from: 'user' },
+      );
+      // completes only because the caller explicitly asked to simulate
+      expect(process.exitCode).toBe(0);
+      const outText = logSpy.mock.calls.map((c) => String(c[0])).join('\n');
+      expect(outText).toContain('simulated');
+      expect(outText).toContain('SIMULATED');
+    } finally {
+      logSpy.mockRestore();
+    }
+  });
+
+  it('macp gate with an empty spec exits nonzero with a typed error', async () => {
+    const program = buildProgram();
+    await program.parseAsync(
+      [
+        'macp',
+        'gate',
+        '   ',
+        '--cwd',
+        tmpDir,
+        '--log',
+        path.join(tmpDir, 'g.log'),
+        '--timeout',
+        '10',
+      ],
+      { from: 'user' },
+    );
+    expect(process.exitCode).not.toBe(0);
+  });
+});
@@ -1,5 +1,73 @@
+import { existsSync, readFileSync } from 'node:fs';
+
 import type { Command } from 'commander';

+import { runGates } from './gate-runner.js';
+import { MACPCapabilityError, type MacpErrorCode } from './errors.js';
+
+/**
+ * Load gates from a spec: an existing file (JSON gates array, a JSON object
+ * with `quality_gates`, a JSON gate object, or one command per line) or an
+ * inline command string. Fails closed with a typed capability error when the
+ * spec contains no executable gate definition.
+ */
+function loadGateSpec(spec: string): unknown[] {
+  if (existsSync(spec)) {
+    const raw = readFileSync(spec, 'utf-8');
+    try {
+      const parsed = JSON.parse(raw) as unknown;
+      if (Array.isArray(parsed)) {
+        if (parsed.length === 0) {
+          throw new MACPCapabilityError(
+            'MACP_NO_COMMAND',
+            'gate-spec',
+            `gate spec file '${spec}' contains an empty gates array`,
+          );
+        }
+        return parsed;
+      }
+      if (typeof parsed === 'object' && parsed !== null) {
+        const obj = parsed as Record<string, unknown>;
+        if (Array.isArray(obj['quality_gates'])) {
+          return obj['quality_gates'];
+        }
+        return [parsed];
+      }
+      throw new MACPCapabilityError(
+        'MACP_NO_COMMAND',
+        'gate-spec',
+        `gate spec file '${spec}' parsed to ${typeof parsed} — expected a gates array, a task with quality_gates, or a gate object`,
+      );
+    } catch (exc) {
+      if (exc instanceof MACPCapabilityError) throw exc;
+      // Not JSON — treat each non-empty line as a command gate.
+      const lines = raw
+        .split('\n')
+        .map((l) => l.trim())
+        .filter((l) => l.length > 0);
+      if (lines.length > 0) return lines;
+      throw new MACPCapabilityError(
+        'MACP_NO_COMMAND',
+        'gate-spec',
+        `gate spec file '${spec}' contains no gates`,
+      );
+    }
+  }
+  if (spec.trim().length > 0) return [spec];
+  throw new MACPCapabilityError('MACP_NO_COMMAND', 'gate-spec', 'gate spec is empty');
+}
+
+/** Print a typed not-implemented failure and exit nonzero (RI-N2 fail-closed). */
+function notImplemented(subcommand: string, capability: string, hint: string): void {
+  const err = new MACPCapabilityError(
+    'MACP_NOT_IMPLEMENTED',
+    capability,
+    `${subcommand} is not implemented in @mosaicstack/macp yet (${capability} capability absent) — ${hint}`,
+  );
+  console.error(`[macp] ${subcommand}: ${err.message} [${err.code}]`);
+  process.exitCode = 1;
+}
+
 /**
 * Register macp subcommands on an existing Commander program.
 * This avoids cross-package Commander version mismatches by using the
@@ -24,15 +92,14 @@ export function registerMacpCommand(parent: Command): void {
      'Filter by task type (coding|deploy|research|review|documentation|infrastructure)',
    )
    .action((opts: { status?: string; type?: string }) => {
-      // not yet wired — task persistence layer is not present in @mosaicstack/macp
-      console.log('[macp] tasks list: not yet wired — use macp package programmatically');
+      // unimplemented capability — a failure, never a success (RI-N2)
      if (opts.status) {
        console.log(`  status filter: ${opts.status}`);
      }
      if (opts.type) {
        console.log(`  type filter: ${opts.type}`);
      }
-      process.exitCode = 0;
+      notImplemented('tasks list', 'task-persistence', 'use the macp package programmatically');
    });

  // ─── submit ──────────────────────────────────────────────────────────────
@@ -41,12 +108,11 @@ export function registerMacpCommand(parent: Command): void {
    .command('submit <path>')
    .description('Submit a task from a JSON/YAML spec file')
    .action((specPath: string) => {
-      // not yet wired — task submission requires a running MACP server
-      console.log('[macp] submit: not yet wired — use macp package programmatically');
+      // unimplemented capability — a failure, never a success (RI-N2)
      console.log(`  spec path: ${specPath}`);
      console.log('  task id:   (unavailable — no MACP server connected)');
      console.log('  status:    (unavailable — no MACP server connected)');
-      process.exitCode = 0;
+      notImplemented('submit', 'macp-server', 'use the macp package programmatically');
    });

  // ─── gate ────────────────────────────────────────────────────────────────
@@ -58,16 +124,58 @@ export function registerMacpCommand(parent: Command): void {
    .option('--cwd <path>', 'Working directory for gate execution', process.cwd())
    .option('--log <path>', 'Path to write gate log output', '/tmp/macp-gate.log')
    .option('--timeout <seconds>', 'Gate timeout in seconds', '60')
-    .action((spec: string, opts: { failOn: string; cwd: string; log: string; timeout: string }) => {
-      // not yet wired — gate execution requires a task context and event sink
-      console.log('[macp] gate: not yet wired — use macp package programmatically');
-      console.log(`  spec:     ${spec}`);
-      console.log(`  fail-on:  ${opts.failOn}`);
-      console.log(`  cwd:      ${opts.cwd}`);
-      console.log(`  log:      ${opts.log}`);
-      console.log(`  timeout:  ${opts.timeout}s`);
-      process.exitCode = 0;
-    });
+    .option(
+      '--simulate',
+      'Simulate gates instead of executing them; results are typed simulated and never satisfy a check',
+    )
+    .action(
+      (
+        spec: string,
+        opts: { failOn: string; cwd: string; log: string; timeout: string; simulate?: boolean },
+      ) => {
+        let gates: unknown[];
+        try {
+          gates = loadGateSpec(spec);
+        } catch (exc) {
+          if (exc instanceof MACPCapabilityError) {
+            console.error(`[macp] gate: ${exc.message} [${exc.code}]`);
+          } else {
+            console.error(`[macp] gate: ${String(exc)}`);
+          }
+          process.exitCode = 1;
+          return;
+        }
+
+        const timeoutSec = Number.parseInt(opts.timeout, 10) || 60;
+        const eventsPath = `${opts.log}.events.ndjson`;
+        const { state, gateResults } = runGates(
+          gates,
+          opts.cwd,
+          opts.log,
+          timeoutSec,
+          eventsPath,
+          'macp-cli-gate',
+          {
+            simulate: opts.simulate,
+          },
+        );
+
+        for (const r of gateResults) {
+          const label = r.command || r.type;
+          const reason = r.reason ? ` — ${r.reason}` : '';
+          console.log(`[macp] gate ${r.status}: ${label}${reason}`);
+        }
+        if (opts.simulate) {
+          console.log(
+            '[macp] SIMULATED run — every result is typed simulated and can never satisfy a gate, dependency, or release check',
+          );
+        }
+
+        // Simulated runs may complete (exit 0) only because the caller
+        // explicitly passed --simulate; the typed state stays 'simulated'.
+        process.exitCode = state === 'passed' || state === 'simulated' ? 0 : 1;
+      },
+    );

  // ─── events ──────────────────────────────────────────────────────────────

@@ -79,14 +187,16 @@ export function registerMacpCommand(parent: Command): void {
    .option('--file <path>', 'Path to the MACP events NDJSON file')
    .option('--follow', 'Follow the file for new events (like tail -f)')
    .action((opts: { file?: string; follow?: boolean }) => {
-      // not yet wired — event streaming requires a live event source
-      console.log('[macp] events tail: not yet wired — use macp package programmatically');
+      // unimplemented capability — a failure, never a success (RI-N2)
      if (opts.file) {
        console.log(`  file:   ${opts.file}`);
      }
      if (opts.follow) {
        console.log('  mode:   follow');
      }
-      process.exitCode = 0;
+      notImplemented('events tail', 'event-source', 'use the macp package programmatically');
    });
 }
+
+// Re-export so CLI consumers can surface typed capability codes.
+export type { MacpErrorCode };
@@ -0,0 +1,35 @@
+/** Typed error code from the closed MACP_ERROR_CODES set. */
+export type MacpErrorCode = (typeof MACP_ERROR_CODES)[number];
+/**
+ * Typed fail-closed capability errors (RI-N2, SDLC-D-035).
+ *
+ * MACP must fail closed when a required capability (executor, reviewer,
+ * command, CI provider, human authority) is absent. These typed codes mirror
+ * the Forge failure vocabulary (FORGE_NO_*) so both packages speak the same
+ * language: an unimplemented capability is a failure, never a stub success.
+ */
+
+/** Closed set of typed MACP capability error codes. */
+export const MACP_ERROR_CODES = [
+  'MACP_NOT_IMPLEMENTED',
+  'MACP_NO_COMMAND',
+  'MACP_NO_REVIEWER',
+  'MACP_NO_CI_PIPELINE',
+  'MACP_NO_PROVIDER',
+  'MACP_AUTHORITY_REQUIRED',
+] as const;
+
+/** Raised when a required capability is missing and execution must fail closed. */
+export class MACPCapabilityError extends Error {
+  /** Typed error code from the closed MACP_ERROR_CODES set. */
+  readonly code: MacpErrorCode;
+  /** The missing capability, e.g. `ci-provider`, `task-persistence`, `command`. */
+  readonly capability: string;
+
+  constructor(code: MacpErrorCode, capability: string, message: string) {
+    super(message);
+    this.name = 'MACPCapabilityError';
+    this.code = code;
+    this.capability = capability;
+  }
+}
@@ -0,0 +1,429 @@
+import fs from 'node:fs';
+import os from 'node:os';
+import path from 'node:path';
+import { afterEach, beforeEach, describe, expect, it } from 'vitest';
+
+import { countAIFindings, normalizeGate, runGate, runGates } from './gate-runner.js';
+
+function makeTmpDir(): string {
+  return fs.mkdtempSync(path.join(os.tmpdir(), 'macp-gate-'));
+}
+
+describe('normalizeGate', () => {
+  it('normalizes a string to mechanical gate', () => {
+    expect(normalizeGate('echo test')).toEqual({
+      command: 'echo test',
+      type: 'mechanical',
+      fail_on: 'blocker',
+    });
+  });
+
+  it('normalizes an object gate with defaults', () => {
+    expect(normalizeGate({ command: 'lint' })).toEqual({
+      command: 'lint',
+      type: 'mechanical',
+      fail_on: 'blocker',
+    });
+  });
+
+  it('preserves explicit type and fail_on', () => {
+    expect(normalizeGate({ command: 'review', type: 'ai-review', fail_on: 'any' })).toEqual({
+      command: 'review',
+      type: 'ai-review',
+      fail_on: 'any',
+    });
+  });
+
+  it('handles non-string/non-object input', () => {
+    expect(normalizeGate(42)).toEqual({ command: '', type: 'mechanical', fail_on: 'blocker' });
+    expect(normalizeGate(null)).toEqual({ command: '', type: 'mechanical', fail_on: 'blocker' });
+  });
+});
+
+describe('countAIFindings', () => {
+  it('returns zeros for non-object', () => {
+    expect(countAIFindings(null)).toEqual({ blockers: 0, total: 0 });
+    expect(countAIFindings('string')).toEqual({ blockers: 0, total: 0 });
+    expect(countAIFindings([])).toEqual({ blockers: 0, total: 0 });
+  });
+
+  it('counts from stats block', () => {
+    const output = { stats: { blockers: 2, should_fix: 3, suggestions: 1 } };
+    expect(countAIFindings(output)).toEqual({ blockers: 2, total: 6 });
+  });
+
+  it('counts from findings array when stats has no blockers', () => {
+    const output = {
+      stats: { blockers: 0 },
+      findings: [{ severity: 'blocker' }, { severity: 'warning' }, { severity: 'blocker' }],
+    };
+    expect(countAIFindings(output)).toEqual({ blockers: 2, total: 3 });
+  });
+
+  it('uses stats blockers over findings array when stats has blockers', () => {
+    const output = {
+      stats: { blockers: 5 },
+      findings: [{ severity: 'blocker' }, { severity: 'warning' }],
+    };
+    // stats.blockers = 5, total from stats = 5+0+0 = 5, findings not used for total since stats total is non-zero
+    expect(countAIFindings(output)).toEqual({ blockers: 5, total: 5 });
+  });
+
+  it('counts findings length as total when stats has zero total', () => {
+    const output = {
+      findings: [{ severity: 'warning' }, { severity: 'info' }],
+    };
+    expect(countAIFindings(output)).toEqual({ blockers: 0, total: 2 });
+  });
+});
+
+describe('runGate', () => {
+  let tmp: string;
+  let logPath: string;
+
+  beforeEach(() => {
+    tmp = makeTmpDir();
+    logPath = path.join(tmp, 'gate.log');
+  });
+
+  afterEach(() => {
+    fs.rmSync(tmp, { recursive: true, force: true });
+  });
+
+  it('passes mechanical gate on exit 0', () => {
+    const result = runGate('echo hello', tmp, logPath, 30);
+    expect(result.passed).toBe(true);
+    expect(result.exit_code).toBe(0);
+    expect(result.type).toBe('mechanical');
+    expect(result.output).toContain('hello');
+  });
+
+  it('fails mechanical gate on non-zero exit', () => {
+    const result = runGate('exit 1', tmp, logPath, 30);
+    expect(result.passed).toBe(false);
+    expect(result.exit_code).toBe(1);
+  });
+
+  it('ci-pipeline fails closed without a CI provider (no placeholder pass)', () => {
+    const result = runGate({ command: 'anything', type: 'ci-pipeline' }, tmp, logPath, 30);
+    expect(result.passed).toBe(false);
+    expect(result.status).toBe('capability_failure');
+    expect(result.capability_code).toBe('MACP_NO_CI_PIPELINE');
+    expect(result.type).toBe('ci-pipeline');
+    expect(result.output).not.toBe('CI pipeline gate placeholder');
+  });
+
+  it('empty command is a typed capability failure, never a pass', () => {
+    const result = runGate({ command: '' }, tmp, logPath, 30);
+    expect(result.passed).toBe(false);
+    expect(result.status).toBe('capability_failure');
+    expect(result.capability_code).toBe('MACP_NO_COMMAND');
+  });
+
+  it('ai-review gate parses JSON output', () => {
+    const json = JSON.stringify({ stats: { blockers: 0, should_fix: 1 } });
+    const result = runGate({ command: `echo '${json}'`, type: 'ai-review' }, tmp, logPath, 30);
+    expect(result.passed).toBe(true);
+    expect(result.blockers).toBe(0);
+    expect(result.findings).toBe(1);
+  });
+
+  it('ai-review gate fails on blockers', () => {
+    const json = JSON.stringify({ stats: { blockers: 2 } });
+    const result = runGate({ command: `echo '${json}'`, type: 'ai-review' }, tmp, logPath, 30);
+    expect(result.passed).toBe(false);
+    expect(result.blockers).toBe(2);
+  });
+
+  it('ai-review gate with fail_on=any fails on any findings', () => {
+    const json = JSON.stringify({ stats: { blockers: 0, should_fix: 1 } });
+    const result = runGate(
+      { command: `echo '${json}'`, type: 'ai-review', fail_on: 'any' },
+      tmp,
+      logPath,
+      30,
+    );
+    expect(result.passed).toBe(false);
+    expect(result.fail_on).toBe('any');
+  });
+
+  it('ai-review gate fails on invalid JSON output', () => {
+    const result = runGate({ command: 'echo "not json"', type: 'ai-review' }, tmp, logPath, 30);
+    expect(result.passed).toBe(false);
+    expect(result.parse_error).toBeDefined();
+  });
+
+  it('writes to log file', () => {
+    runGate('echo logged', tmp, logPath, 30);
+    const log = fs.readFileSync(logPath, 'utf-8');
+    expect(log).toContain('COMMAND: echo logged');
+    expect(log).toContain('logged');
+    expect(log).toContain('EXIT:');
+  });
+});
+
+describe('runGates', () => {
+  let tmp: string;
+  let logPath: string;
+  let eventsPath: string;
+
+  beforeEach(() => {
+    tmp = makeTmpDir();
+    logPath = path.join(tmp, 'gates.log');
+    eventsPath = path.join(tmp, 'events.ndjson');
+  });
+
+  afterEach(() => {
+    fs.rmSync(tmp, { recursive: true, force: true });
+  });
+
+  it('runs multiple gates and returns results', () => {
+    const { allPassed, gateResults } = runGates(
+      ['echo one', 'echo two'],
+      tmp,
+      logPath,
+      30,
+      eventsPath,
+      'task-1',
+    );
+    expect(allPassed).toBe(true);
+    expect(gateResults).toHaveLength(2);
+  });
+
+  it('reports failure when any gate fails', () => {
+    const { allPassed, gateResults } = runGates(
+      ['echo ok', 'exit 1'],
+      tmp,
+      logPath,
+      30,
+      eventsPath,
+      'task-2',
+    );
+    expect(allPassed).toBe(false);
+    expect(gateResults[0]!.passed).toBe(true);
+    expect(gateResults[1]!.passed).toBe(false);
+  });
+
+  it('emits events for each gate', () => {
+    runGates(['echo test'], tmp, logPath, 30, eventsPath, 'task-3');
+    const events = fs
+      .readFileSync(eventsPath, 'utf-8')
+      .trim()
+      .split('\n')
+      .map((l) => JSON.parse(l));
+    expect(events).toHaveLength(2); // started + passed
+    expect(events[0].event_type).toBe('rail.check.started');
+    expect(events[1].event_type).toBe('rail.check.passed');
+  });
+
+  it('does not silently skip gates with empty command — they become capability failures', () => {
+    const { gateResults, allPassed, state } = runGates(
+      [{ command: '', type: 'mechanical' }, 'echo real'],
+      tmp,
+      logPath,
+      30,
+      eventsPath,
+      'task-4',
+    );
+    expect(gateResults).toHaveLength(2);
+    expect(gateResults[0]!.status).toBe('capability_failure');
+    expect(gateResults[1]!.status).toBe('passed');
+    expect(allPassed).toBe(false);
+    expect(state).toBe('capability_failure');
+  });
+
+  it('does not skip ci-pipeline even with empty command — typed capability failure', () => {
+    const { gateResults, allPassed, state } = runGates(
+      [{ command: '', type: 'ci-pipeline' }],
+      tmp,
+      logPath,
+      30,
+      eventsPath,
+      'task-5',
+    );
+    expect(gateResults).toHaveLength(1);
+    expect(gateResults[0]!.passed).toBe(false);
+    expect(gateResults[0]!.status).toBe('capability_failure');
+    expect(allPassed).toBe(false);
+    expect(state).toBe('capability_failure');
+  });
+
+  it('emits failed event with correct message', () => {
+    runGates(['exit 42'], tmp, logPath, 30, eventsPath, 'task-6');
+    const events = fs
+      .readFileSync(eventsPath, 'utf-8')
+      .trim()
+      .split('\n')
+      .map((l) => JSON.parse(l));
+    const failEvent = events.find(
+      (e: Record<string, unknown>) => e.event_type === 'rail.check.failed',
+    );
+    expect(failEvent).toBeDefined();
+    expect(failEvent.message).toContain('Gate failed (');
+  });
+});
+
+/**
+ * RI-N2 / SDLC-D-035 fail-closed controls for the MACP gate runner.
+ *
+ * Invariant under test: `passed: true` occurs ONLY when a gate really executed
+ * and really exited green (`status === 'passed'`). Absent capabilities,
+ * manual sign-offs, and simulated runs are typed distinctly and can never
+ * make the aggregate `passed`.
+ */
+describe('gate-runner fail-closed (RI-N2)', () => {
+  let tmpDir: string;
+  let logPath: string;
+  let eventsPath: string;
+
+  beforeEach(() => {
+    tmpDir = makeTmpDir();
+    logPath = path.join(tmpDir, 'gate.log');
+    eventsPath = path.join(tmpDir, 'events.ndjson');
+  });
+
+  afterEach(() => {
+    fs.rmSync(tmpDir, { recursive: true, force: true });
+  });
+
+  function run(gates: unknown[], options?: { simulate?: boolean }) {
+    return runGates(gates, tmpDir, logPath, 10, eventsPath, 'spec-task', options);
+  }
+
+  // ─── positive controls ───────────────────────────────────────────────────
+
+  it('a really-executed green command gate still passes', () => {
+    const result = run([{ command: 'exit 0', type: 'mechanical' }]);
+    expect(result.gateResults[0]!.status).toBe('passed');
+    expect(result.gateResults[0]!.passed).toBe(true);
+    expect(result.allPassed).toBe(true);
+    expect(result.state).toBe('passed');
+  });
+
+  it('explicit simulate completes and types every result simulated', () => {
+    const result = run([{ command: 'exit 0', type: 'mechanical' }, 'echo hello'], {
+      simulate: true,
+    });
+    expect(result.gateResults).toHaveLength(2);
+    for (const gate of result.gateResults) {
+      expect(gate.status).toBe('simulated');
+      expect(gate.passed).toBe(false);
+    }
+    expect(result.state).toBe('simulated');
+  });
+
+  it('a really-executed red command gate fails with typed status failed', () => {
+    const result = run([{ command: 'exit 3', type: 'mechanical' }]);
+    expect(result.gateResults[0]!.status).toBe('failed');
+    expect(result.gateResults[0]!.passed).toBe(false);
+    expect(result.allPassed).toBe(false);
+    expect(result.state).toBe('failed');
+  });
+
+  // ─── negative controls — each asserts typed status AND aggregate not passed ──
+
+  it('an empty-command gate is a capability_failure, not skipped and not passed', () => {
+    const result = run([{ command: '', type: 'mechanical' }]);
+    // runGates must not silently skip it — it produces a typed result
+    expect(result.gateResults).toHaveLength(1);
+    const gate = result.gateResults[0]!;
+    expect(gate.status).toBe('capability_failure');
+    expect(gate.capability_code).toBe('MACP_NO_COMMAND');
+    expect(gate.passed).toBe(false);
+    // aggregate is not passed
+    expect(result.allPassed).toBe(false);
+    expect(result.state).toBe('capability_failure');
+    expect(result.state).not.toBe('passed');
+  });
+
+  it('a commandless ai-review gate is a typed MACP_NO_REVIEWER capability_failure', () => {
+    const result = run([{ command: '', type: 'ai-review' }]);
+    expect(result.gateResults[0]!.status).toBe('capability_failure');
+    expect(result.gateResults[0]!.capability_code).toBe('MACP_NO_REVIEWER');
+    expect(result.allPassed).toBe(false);
+    expect(result.state).not.toBe('passed');
+  });
+
+  it('a ci-pipeline gate without a provider implementation is a capability_failure, never a placeholder pass', () => {
+    const result = run([{ command: '', type: 'ci-pipeline' }]);
+    const gate = result.gateResults[0]!;
+    expect(gate.status).toBe('capability_failure');
+    expect(gate.capability_code).toBe('MACP_NO_CI_PIPELINE');
+    expect(gate.passed).toBe(false);
+    // the old false-success placeholder must be gone
+    expect(gate.output).not.toBe('CI pipeline gate placeholder');
+    expect(result.allPassed).toBe(false);
+    expect(result.state).not.toBe('passed');
+  });
+
+  it('a ci-pipeline gate fails closed even alongside an otherwise green run', () => {
+    const result = run(['exit 0', { type: 'ci-pipeline', command: 'fake-ci' }]);
+    expect(result.gateResults[1]!.status).toBe('capability_failure');
+    expect(result.gateResults[0]!.status).toBe('passed');
+    expect(result.allPassed).toBe(false);
+    expect(result.state).toBe('capability_failure');
+  });
+
+  it('a manual gate with no automation enters typed waiting — neither pass nor fail', () => {
+    const result = run([{ type: 'manual' }]);
+    const gate = result.gateResults[0]!;
+    expect(gate.status).toBe('waiting');
+    expect(gate.passed).toBe(false);
+    expect(gate.exit_code).toBe(0);
+    // aggregate is not passed while any gate is waiting
+    expect(result.allPassed).toBe(false);
+    expect(result.state).toBe('waiting');
+    expect(result.state).not.toBe('passed');
+  });
+
+  it('a simulated result can never make the aggregate passed', () => {
+    const result = run(['exit 0', 'exit 0'], { simulate: true });
+    expect(result.gateResults.every((g) => g.status === 'simulated')).toBe(true);
+    expect(result.allPassed).toBe(false);
+    expect(result.state).toBe('simulated');
+    expect(result.state).not.toBe('passed');
+  });
+
+  it('waiting dominates an otherwise green aggregate', () => {
+    const result = run(['exit 0', { type: 'manual' }]);
+    expect(result.allPassed).toBe(false);
+    expect(result.state).toBe('waiting');
+  });
+});
+
+describe('runGate fail-closed (RI-N2)', () => {
+  let tmpDir: string;
+  let logPath: string;
+
+  beforeEach(() => {
+    tmpDir = makeTmpDir();
+    logPath = path.join(tmpDir, 'gate.log');
+  });
+
+  afterEach(() => {
+    fs.rmSync(tmpDir, { recursive: true, force: true });
+  });
+
+  it('simulate: true returns a typed simulated result without executing', () => {
+    const result = runGate('this-command-does-not-exist-xyz', tmpDir, logPath, 10, {
+      simulate: true,
+    });
+    expect(result.status).toBe('simulated');
+    expect(result.passed).toBe(false);
+    expect(result.exit_code).toBe(0);
+  });
+
+  it('normal mode executes for real and types a green gate passed', () => {
+    const result = runGate('echo ok', tmpDir, logPath, 10);
+    expect(result.status).toBe('passed');
+    expect(result.passed).toBe(true);
+    expect(result.output).toContain('ok');
+  });
+
+  it('a bare string gate normalizes to mechanical and executes', () => {
+    const result = runGate('exit 7', tmpDir, logPath, 10);
+    expect(result.type).toBe('mechanical');
+    expect(result.status).toBe('failed');
+    expect(result.passed).toBe(false);
+  });
+});
@@ -4,7 +4,20 @@ import { dirname } from 'node:path';

 import { emitEvent } from './event-emitter.js';
 import { nowISO } from './event-emitter.js';
-import type { GateResult } from './types.js';
+import type { GateResult, GateStatus, RunGatesResult } from './types.js';
+
+/** Typed reason stamped on every simulated gate result. */
+export const SIMULATED_GATE_REASON =
+  'simulated execution (explicit simulate opt-in): gate was not evaluated by a real implementation';
+
+/** Options for gate execution (RI-N2 fail-closed / explicit simulation). */
+export interface RunGateOptions {
+  /**
+   * Explicit caller opt-in to simulation. Simulated gates are NOT executed;
+   * every result is typed `simulated` and never satisfies anything.
+   */
+  simulate?: boolean;
+}

 export interface NormalizedGate {
  command: string;
@@ -103,36 +116,91 @@ export function countAIFindings(parsedOutput: unknown): { blockers: number; tota
  return { blockers, total };
 }

+function simulatedResult(gateEntry: NormalizedGate): GateResult {
+  return {
+    command: gateEntry.command,
+    exit_code: 0,
+    type: gateEntry.type,
+    output: SIMULATED_GATE_REASON,
+    timed_out: false,
+    passed: false,
+    status: 'simulated',
+    reason: SIMULATED_GATE_REASON,
+  };
+}
+
+function capabilityFailureResult(
+  gateEntry: NormalizedGate,
+  code: GateResult['capability_code'],
+  reason: string,
+): GateResult {
+  return {
+    command: gateEntry.command,
+    exit_code: 1,
+    type: gateEntry.type,
+    output: '',
+    timed_out: false,
+    passed: false,
+    status: 'capability_failure',
+    capability_code: code,
+    reason,
+  };
+}
+
+function waitingResult(gateEntry: NormalizedGate, reason: string): GateResult {
+  return {
+    command: gateEntry.command,
+    exit_code: 0,
+    type: gateEntry.type,
+    output: '',
+    timed_out: false,
+    passed: false,
+    status: 'waiting',
+    capability_code: 'MACP_AUTHORITY_REQUIRED',
+    reason,
+  };
+}
+
 export function runGate(
  gate: unknown,
  cwd: string,
  logPath: string,
  timeoutSec: number,
+  options: RunGateOptions = {},
 ): GateResult {
  const gateEntry = normalizeGate(gate);
  const gateType = gateEntry.type;
  const command = gateEntry.command;

+  // Explicit simulation only: never executes, typed simulated, never satisfying.
+  if (options.simulate) {
+    return simulatedResult(gateEntry);
+  }
+
+  // Fail closed: no CI provider implementation exists in @mosaicstack/macp,
+  // so a ci-pipeline gate is an absent capability — never a placeholder pass.
  if (gateType === 'ci-pipeline') {
-    return {
-      command,
-      exit_code: 0,
-      type: gateType,
-      output: 'CI pipeline gate placeholder',
-      timed_out: false,
-      passed: true,
-    };
+    return capabilityFailureResult(
+      gateEntry,
+      'MACP_NO_CI_PIPELINE',
+      `ci-pipeline gate '${gateEntry.command || gateType}' has no CI provider implementation wired — refusing placeholder pass`,
+    );
  }

  if (!command) {
-    return {
-      command: '',
-      exit_code: 0,
-      type: gateType,
-      output: '',
-      timed_out: false,
-      passed: true,
-    };
+    // A manual gate with no automation waits for human sign-off: not pass, not fail.
+    if (gateType === 'manual') {
+      return waitingResult(
+        gateEntry,
+        `manual gate has no automation — waiting for human sign-off (type: ${gateType})`,
+      );
+    }
+    // Any other commandless gate is an absent capability — never a vacuous pass.
+    return capabilityFailureResult(
+      gateEntry,
+      gateType === 'ai-review' ? 'MACP_NO_REVIEWER' : 'MACP_NO_COMMAND',
+      `gate of type '${gateType}' has no command to execute — refusing empty-command pass`,
+    );
  }

  const { exitCode, output, timedOut } = runShell(command, cwd, logPath, timeoutSec);
@@ -143,10 +211,12 @@ export function runGate(
    output,
    timed_out: timedOut,
    passed: false,
+    status: 'failed',
  };

  if (gateType !== 'ai-review') {
    result.passed = exitCode === 0;
+    result.status = result.passed ? 'passed' : 'failed';
    return result;
  }

@@ -170,6 +240,7 @@ export function runGate(
  } else {
    result.passed = exitCode === 0 && blockers === 0 && !timedOut && parseError === undefined;
  }
+  result.status = result.passed ? 'passed' : 'failed';

  result.fail_on = failOn;
  result.blockers = blockers;
@@ -191,16 +262,19 @@ export function runGates(
  timeoutSec: number,
  eventsPath: string,
  taskId: string,
-): { allPassed: boolean; gateResults: GateResult[] } {
-  let allPassed = true;
+  options: RunGateOptions = {},
+): RunGatesResult {
  const gateResults: GateResult[] = [];
+  let hasCapabilityFailure = false;
+  let hasSimulated = false;
+  let hasFailed = false;
+  let hasWaiting = false;

  for (const gate of gates) {
    const gateEntry = normalizeGate(gate);
    const gateCmd = gateEntry.command;
-    if (!gateCmd && gateEntry.type !== 'ci-pipeline') continue;
-
    const label = gateCmd || gateEntry.type;
+    // NOTE: no silent skip — every gate produces a typed result (RI-N2).
    emitEvent(
      eventsPath,
      'rail.check.started',
@@ -209,10 +283,10 @@ export function runGates(
      'quality-gate',
      `Running gate: ${label}`,
    );
-    const result = runGate(gate, cwd, logPath, timeoutSec);
+    const result = runGate(gate, cwd, logPath, timeoutSec, options);
    gateResults.push(result);

-    if (result.passed) {
+    if (result.status === 'passed') {
      emitEvent(
        eventsPath,
        'rail.check.passed',
@@ -224,7 +298,46 @@ export function runGates(
      continue;
    }

-    allPassed = false;
+    if (result.status === 'waiting') {
+      hasWaiting = true;
+      emitEvent(
+        eventsPath,
+        'rail.check.waiting',
+        taskId,
+        'gated',
+        'quality-gate',
+        `Gate waiting: ${label} — ${result.reason ?? 'manual gate awaits sign-off'}`,
+      );
+      continue;
+    }
+
+    if (result.status === 'simulated') {
+      hasSimulated = true;
+      emitEvent(
+        eventsPath,
+        'rail.check.simulated',
+        taskId,
+        'gated',
+        'quality-gate',
+        `Gate simulated (non-satisfying): ${label}`,
+      );
+      continue;
+    }
+
+    if (result.status === 'capability_failure') {
+      hasCapabilityFailure = true;
+      emitEvent(
+        eventsPath,
+        'rail.check.failed',
+        taskId,
+        'gated',
+        'quality-gate',
+        `Gate capability failure (${result.capability_code ?? 'MACP_NO_PROVIDER'}): ${label} — ${result.reason ?? 'required capability is absent'}`,
+      );
+      continue;
+    }
+
+    hasFailed = true;
    let message: string;
    if (result.timed_out) {
      message = `Gate timed out after ${timeoutSec}s: ${label}`;
@@ -236,5 +349,15 @@ export function runGates(
    emitEvent(eventsPath, 'rail.check.failed', taskId, 'gated', 'quality-gate', message);
  }

-  return { allPassed, gateResults };
+  const state: GateStatus = hasCapabilityFailure
+    ? 'capability_failure'
+    : hasSimulated
+      ? 'simulated'
+      : hasFailed
+        ? 'failed'
+        : hasWaiting
+          ? 'waiting'
+          : 'passed';
+
+  return { allPassed: state === 'passed', gateResults, state };
 }
@@ -6,11 +6,13 @@ export type {
  DependsOnPolicy,
  GateType,
  GateFailOn,
+  GateStatus,
  GateEntry,
  Task,
  EventType,
  MACPEvent,
  GateResult,
+  RunGatesResult,
  TaskResult,
  ProviderMeta,
  ProviderRegistry,
@@ -18,6 +20,11 @@ export type {

 export { CredentialError } from './types.js';

+// Typed fail-closed capability errors (RI-N2, SDLC-D-035)
+export { MACP_ERROR_CODES, MACPCapabilityError } from './errors.js';
+
+export type { MacpErrorCode } from './errors.js';
+
 // Credential resolver
 export {
  DEFAULT_CREDENTIALS_DIR,
@@ -35,9 +42,16 @@ export {
 export type { ResolveCredentialsOptions } from './credential-resolver.js';

 // Gate runner
-export { normalizeGate, runShell, countAIFindings, runGate, runGates } from './gate-runner.js';
+export {
+  normalizeGate,
+  runShell,
+  countAIFindings,
+  runGate,
+  runGates,
+  SIMULATED_GATE_REASON,
+} from './gate-runner.js';

-export type { NormalizedGate } from './gate-runner.js';
+export type { NormalizedGate, RunGateOptions } from './gate-runner.js';

 // Risk-floor (agent reflection loop — diff review classifier)
 export { evaluateRiskFloor, DEFAULT_RISK_THRESHOLD } from './risk-floor.js';
@@ -1,3 +1,5 @@
+import type { MacpErrorCode } from './errors.js';
+
 /** Task status values. */
 export type TaskStatus = 'pending' | 'running' | 'gated' | 'completed' | 'failed' | 'escalated';

@@ -17,7 +19,17 @@ export type DispatchMode = 'yolo' | 'acp' | 'exec';
 export type DependsOnPolicy = 'all' | 'any' | 'all_terminal';

 /** Quality gate type. */
-export type GateType = 'mechanical' | 'ai-review' | 'ci-pipeline';
+export type GateType = 'mechanical' | 'ai-review' | 'ci-pipeline' | 'manual';
+
+/**
+ * Typed execution state of a gate — closed set (RI-N2, SDLC-D-035).
+ *
+ * Only `passed` means "really executed and green". `simulated` is produced
+ * exclusively under an explicit simulate opt-in and never satisfies anything.
+ * `capability_failure` means a required executor/provider/command was absent.
+ * `waiting` means a manual gate awaits human sign-off (neither pass nor fail).
+ */
+export type GateStatus = 'passed' | 'failed' | 'simulated' | 'waiting' | 'capability_failure';

 /** Gate fail_on mode. */
 export type GateFailOn = 'blocker' | 'any';
@@ -67,7 +79,9 @@ export type EventType =
  | 'task.retry.scheduled'
  | 'rail.check.started'
  | 'rail.check.passed'
-  | 'rail.check.failed';
+  | 'rail.check.failed'
+  | 'rail.check.waiting'
+  | 'rail.check.simulated';

 /** Structured event record. */
 export interface MACPEvent {
@@ -88,7 +102,14 @@ export interface GateResult {
  type: string;
  output: string;
  timed_out: boolean;
+  /** Back-compat boolean view — true ONLY when `status === 'passed'`. */
  passed: boolean;
+  /** Typed discriminator — the authoritative gate outcome (RI-N2). */
+  status: GateStatus;
+  /** Typed capability error code, set when `status === 'capability_failure'`. */
+  capability_code?: MacpErrorCode;
+  /** Why a non-executed state (simulated/waiting/capability_failure) was reached. */
+  reason?: string;
  fail_on?: string;
  blockers?: number;
  findings?: number;
@@ -96,6 +117,22 @@ export interface GateResult {
  parse_error?: string;
 }

+/**
+ * Aggregate outcome of `runGates` (RI-N2).
+ *
+ * `state` is the typed aggregate: it is `passed` only when every gate really
+ * executed green. A `simulated` result makes the aggregate `simulated` (never
+ * `passed`); a `waiting` manual gate keeps the aggregate `waiting`; a missing
+ * capability makes it `capability_failure`. `allPassed` is exactly
+ * `state === 'passed'`, so a simulated or waiting result can never satisfy a
+ * dependency, acceptance criterion, gate, merge, or release check.
+ */
+export interface RunGatesResult {
+  allPassed: boolean;
+  gateResults: GateResult[];
+  state: GateStatus;
+}
+
 /** Result from a completed task. */
 export interface TaskResult {
  task_id: string;
@@ -51,12 +51,8 @@ See `docs/fleet/reference/generated-env-boundary.md` for the full contract.
 ## Manual canary sequence

 Use the roster and the supported installer; do not pre-create the agent environment directory or
-edit a generated projection. Before it writes any holder identity, tool, projection, or unit file,
-`mosaic fleet install` validates the fleet CLI and every distinct roster runtime through the exact
-pane PATH. The shared helper also unwraps `/usr/bin/env` shebangs, so a resolved Node script with no
-pane-visible Node fails before effects. `mosaic fleet doctor` reports the same named executable
-checks without mutation. After that preflight, install places the units and helpers and writes private
-roster-derived projections before any service starts.
+edit a generated projection. `mosaic fleet install` validates the roster, installs the units and
+helpers, and writes private roster-derived projections before any service is started.

 ```bash
 # Create a site-owned canary roster. Inspect an existing roster before using --force.
@@ -1,199 +0,0 @@
-#!/usr/bin/env bash
-# Canonical fleet-pane PATH construction and executable reachability checks.
-#
-# This file is both sourceable by start-agent-session.sh and executable by the
-# fleet CLI preflight. Keep the pane PATH in one implementation: provisioning
-# checks and the eventual pane must answer the same question.
-
-mosaic_fleet_pane_home() {
-  local mosaic_home="$1"
-  local fallback_home="$2"
-  case "$mosaic_home" in
-    */.config/mosaic) printf '%s' "${mosaic_home%/.config/mosaic}" ;;
-    *) printf '%s' "$fallback_home" ;;
-  esac
-}
-
-mosaic_fleet_build_runtime_bin_prefix() {
-  local pane_home="$1"
-  local runtime_bin="${2:-}"
-  local candidates=()
-  if [ -n "$runtime_bin" ]; then candidates+=("$runtime_bin"); fi
-  if command -v npm >/dev/null 2>&1; then
-    local npm_prefix
-    npm_prefix=$(npm config get prefix 2>/dev/null) || true
-    if [ -n "$npm_prefix" ]; then candidates+=("${npm_prefix}/bin"); fi
-  fi
-  candidates+=("$pane_home/.npm-global/bin" "$pane_home/.local/bin")
-
-  local prefix="" dir
-  for dir in "${candidates[@]}"; do
-    [ -d "$dir" ] || continue
-    case ":${prefix}:" in *":${dir}:"*) ;; *) prefix="${prefix:+$prefix:}$dir" ;; esac
-  done
-  printf '%s' "$prefix"
-}
-
-mosaic_fleet_build_pane_path() {
-  local pane_home="$1"
-  local runtime_bin="${2:-}"
-  local system_path="${3:-/usr/local/bin:/usr/bin:/bin}"
-  local prefix
-  prefix=$(mosaic_fleet_build_runtime_bin_prefix "$pane_home" "$runtime_bin")
-  printf '%s' "${prefix:+${prefix}:}${system_path}"
-}
-
-mosaic_fleet_resolve_in_pane_path() {
-  local pane_path="$1"
-  local binary="$2"
-  PATH="$pane_path" command -v -- "$binary" 2>/dev/null
-}
-
-# Sets executable evidence in MOSAIC_FLEET_EXECUTABLE_* and returns nonzero when
-# a resolved script's shebang interpreter cannot run in the pane. Native/ELF
-# binaries have no PATH-resolved interpreter dependency and pass the executable
-# bit check. Node receives an additional side-effect-free `node --version`
-# execution check; invoking `mosaic --version` itself is intentionally avoided
-# because Mosaic performs a cache-writing/network update check at CLI startup.
-mosaic_fleet_check_resolved_executable() {
-  local pane_path="$1"
-  local resolved="$2"
-  MOSAIC_FLEET_EXECUTABLE_DEPENDENCY=""
-  MOSAIC_FLEET_EXECUTABLE_PROBE=""
-  MOSAIC_FLEET_EXECUTABLE_EXIT=""
-  MOSAIC_FLEET_EXECUTABLE_OUTPUT=""
-
-  [ -x "$resolved" ] || {
-    MOSAIC_FLEET_EXECUTABLE_OUTPUT="resolved path is not executable"
-    return 70
-  }
-
-  local magic=""
-  IFS= read -r -n 2 magic < "$resolved" || true
-  [ "$magic" = '#!' ] || return 0
-
-  local shebang
-  IFS= read -r shebang < "$resolved" || true
-  shebang=${shebang%$'\r'}
-  shebang=${shebang#\#!}
-  local parts=()
-  read -r -a parts <<< "$shebang"
-  local interpreter="${parts[0]:-}"
-  [[ "$interpreter" = /* ]] && [ -x "$interpreter" ] || {
-    MOSAIC_FLEET_EXECUTABLE_DEPENDENCY="$interpreter"
-    MOSAIC_FLEET_EXECUTABLE_OUTPUT="shebang interpreter is absent or not executable"
-    return 70
-  }
-
-  local dependency="$interpreter"
-  local dependency_path="$interpreter"
-  if [ "${interpreter##*/}" = env ]; then
-    local index=1
-    if [ "${parts[$index]:-}" = -S ]; then index=$((index + 1)); fi
-    dependency="${parts[$index]:-}"
-    if [ -z "$dependency" ] || [[ "$dependency" = -* ]]; then
-      MOSAIC_FLEET_EXECUTABLE_DEPENDENCY="$dependency"
-      MOSAIC_FLEET_EXECUTABLE_OUTPUT="unsupported env shebang"
-      return 70
-    fi
-  fi
-
-  MOSAIC_FLEET_EXECUTABLE_DEPENDENCY="$dependency"
-  if [ "${dependency##*/}" = node ]; then
-    MOSAIC_FLEET_EXECUTABLE_PROBE="node --version"
-  fi
-  if [ "${interpreter##*/}" = env ]; then
-    if ! dependency_path=$(mosaic_fleet_resolve_in_pane_path "$pane_path" "$dependency"); then
-      MOSAIC_FLEET_EXECUTABLE_OUTPUT="shebang command is not on the pane PATH"
-      return 70
-    fi
-  fi
-
-  if [ "${dependency##*/}" = node ]; then
-    if MOSAIC_FLEET_EXECUTABLE_OUTPUT=$(PATH="$pane_path" "$dependency_path" --version 2>&1); then
-      MOSAIC_FLEET_EXECUTABLE_EXIT=0
-    else
-      MOSAIC_FLEET_EXECUTABLE_EXIT=$?
-      return 70
-    fi
-  fi
-  return 0
-}
-
-mosaic_fleet_runtime_path_main() {
-  local mosaic_home=""
-  local runtime_bin=""
-  local system_path="/usr/local/bin:/usr/bin:/bin"
-  local binary=""
-  local check_executable=0
-
-  while [ "$#" -gt 0 ]; do
-    case "$1" in
-      --mosaic-home)
-        [ "$#" -ge 2 ] || return 64
-        mosaic_home="$2"
-        shift 2
-        ;;
-      --runtime-bin)
-        [ "$#" -ge 2 ] || return 64
-        runtime_bin="$2"
-        shift 2
-        ;;
-      --binary)
-        [ "$#" -ge 2 ] || return 64
-        binary="$2"
-        shift 2
-        ;;
-      --check-executable)
-        check_executable=1
-        shift
-        ;;
-      # Test seam for measuring a greenfield host with no system Node. The
-      # launcher and production CLI omit it and retain the fixed system suffix.
-      --system-path)
-        [ "$#" -ge 2 ] || return 64
-        system_path="$2"
-        shift 2
-        ;;
-      *) return 64 ;;
-    esac
-  done
-
-  [ -n "$mosaic_home" ] && [ -n "$binary" ] || return 64
-  local pane_home pane_path resolved
-  pane_home=$(mosaic_fleet_pane_home "$mosaic_home" "${HOME:-}")
-  # npm config is HOME-sensitive. Pin it to the derived pane home before asking
-  # for its prefix so an operator's unrelated npmrc cannot influence preflight.
-  HOME=$pane_home
-  export HOME
-  pane_path=$(mosaic_fleet_build_pane_path "$pane_home" "$runtime_bin" "$system_path")
-  if ! resolved=$(mosaic_fleet_resolve_in_pane_path "$pane_path" "$binary"); then
-    printf 'pane_path\0%s\0status\0missing\0binary_path\0\0dependency\0\0probe_command\0\0probe_exit\0\0probe_output\0\0' \
-      "$pane_path"
-    return 69
-  fi
-
-  if [ "$check_executable" -eq 1 ]; then
-    if mosaic_fleet_check_resolved_executable "$pane_path" "$resolved"; then
-      printf 'pane_path\0%s\0status\0present\0binary_path\0%s\0dependency\0%s\0probe_command\0%s\0probe_exit\0%s\0probe_output\0%s\0' \
-        "$pane_path" "$resolved" "$MOSAIC_FLEET_EXECUTABLE_DEPENDENCY" \
-        "$MOSAIC_FLEET_EXECUTABLE_PROBE" "$MOSAIC_FLEET_EXECUTABLE_EXIT" \
-        "$MOSAIC_FLEET_EXECUTABLE_OUTPUT"
-      return 0
-    fi
-    printf 'pane_path\0%s\0status\0unexecutable\0binary_path\0%s\0dependency\0%s\0probe_command\0%s\0probe_exit\0%s\0probe_output\0%s\0' \
-      "$pane_path" "$resolved" "$MOSAIC_FLEET_EXECUTABLE_DEPENDENCY" \
-      "$MOSAIC_FLEET_EXECUTABLE_PROBE" "$MOSAIC_FLEET_EXECUTABLE_EXIT" \
-      "$MOSAIC_FLEET_EXECUTABLE_OUTPUT"
-    return 70
-  fi
-
-  printf 'pane_path\0%s\0status\0present\0binary_path\0%s\0dependency\0\0probe_command\0\0probe_exit\0\0probe_output\0\0' \
-    "$pane_path" "$resolved"
-  return 0
-}
-
-if [[ "${BASH_SOURCE[0]}" == "$0" ]]; then
-  set -euo pipefail
-  mosaic_fleet_runtime_path_main "$@"
-fi
@@ -258,22 +258,46 @@ if _tmux has-session -t "=${AGENT_NAME}:0.0" 2>/dev/null; then
 fi

 # Systemd passes HOME as %h, and the installed service fixes MOSAIC_HOME under
-# that home. The provisioning preflight executes this same helper under the
-# unit's clean launcher environment, so operator PATH cannot produce a false
-# green result for a binary the pane will never see.
-SCRIPT_DIR=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)
-# shellcheck source=pane-runtime-path.sh
-. "$SCRIPT_DIR/pane-runtime-path.sh"
-PANE_HOME=$(mosaic_fleet_pane_home "$MOSAIC_HOME" "$HOME")
-PANE_PATH=$(mosaic_fleet_build_pane_path "$PANE_HOME" "$MOSAIC_RUNTIME_BIN")
+# that home. Derive the pane home from the canonical path when available so an
+# inherited pane/session HOME cannot become runtime authority.
+PANE_HOME=$HOME
+case "$MOSAIC_HOME" in
+  */.config/mosaic) PANE_HOME=${MOSAIC_HOME%/.config/mosaic} ;;
+esac

-# #1241/#1256. The pane runs `mosaic yolo <runtime>` under PANE_PATH with a
-# cleared environment. Resolve both names and validate any shebang interpreter
-# here, before an effect, where the failure remains attributable. Name
-# resolution alone is insufficient: an `#!/usr/bin/env node` script resolves
-# even when the pane cannot execute it because Node is absent.
+_build_runtime_bin_prefix() {
+  local candidates=()
+  if [ -n "$MOSAIC_RUNTIME_BIN" ]; then candidates+=("$MOSAIC_RUNTIME_BIN"); fi
+  if command -v npm >/dev/null 2>&1; then
+    local npm_prefix
+    npm_prefix=$(npm config get prefix 2>/dev/null) || true
+    if [ -n "$npm_prefix" ]; then candidates+=("${npm_prefix}/bin"); fi
+  fi
+  candidates+=("$PANE_HOME/.npm-global/bin" "$PANE_HOME/.local/bin")
+
+  local prefix="" dir
+  for dir in "${candidates[@]}"; do
+    [ -d "$dir" ] || continue
+    case ":${prefix}:" in *":${dir}:"*) ;; *) prefix="${prefix:+$prefix:}$dir" ;; esac
+  done
+  printf '%s' "$prefix"
+}
+
+MOSAIC_RUNTIME_BIN_PREFIX=$(_build_runtime_bin_prefix)
+PANE_PATH=${MOSAIC_RUNTIME_BIN_PREFIX:+${MOSAIC_RUNTIME_BIN_PREFIX}:}/usr/local/bin:/usr/bin:/bin
+
+# #1241. The pane runs `mosaic yolo <runtime>` under PANE_PATH with a cleared
+# environment. A binary missing from *that* path is a pane that dies in under a
+# second, inside a session nobody is attached to, with its diagnostic scrolled
+# into a pane tmux then destroys. Resolve both here, before any effect, where
+# the failure is still attributable to the thing that caused it.
+#
+# `mosaic yolo <runtime>` runs checkRuntime(runtime) and the binary it looks for
+# is named exactly like the runtime, so resolving the runtime name is the same
+# question the pane will ask a moment later — asked while an operator can still
+# see the answer.
 _resolve_in_pane_path() {
-  mosaic_fleet_resolve_in_pane_path "$PANE_PATH" "$1"
+  PATH="$PANE_PATH" command -v -- "$1" 2>/dev/null
 }

 # Exit 69 (EX_UNAVAILABLE): the seat cannot be provided. Distinguished from the
@@ -288,15 +312,8 @@ fail_launch() {
 }

 for required_binary in mosaic "$MOSAIC_AGENT_RUNTIME"; do
-  resolved_binary=$(_resolve_in_pane_path "$required_binary") ||
+  _resolve_in_pane_path "$required_binary" >/dev/null ||
    fail_launch missing-binary "'${required_binary}' is not on the pane PATH (${PANE_PATH})"
-  if mosaic_fleet_check_resolved_executable "$PANE_PATH" "$resolved_binary"; then
-    continue
-  else
-    executable_exit=$?
-  fi
-  fail_launch unexecutable-binary \
-    "'${required_binary}' resolves to '${resolved_binary}' but dependency '${MOSAIC_FLEET_EXECUTABLE_DEPENDENCY:-unknown}' is not executable on the pane PATH (${PANE_PATH}); check_exit=${executable_exit} detail=${MOSAIC_FLEET_EXECUTABLE_OUTPUT:-unavailable}"
 done

 _ensure_claude_workdir_trusted() {
@@ -484,27 +484,6 @@ assert_missing_pane_binary_rejected() {
 assert_missing_pane_binary_rejected mosaic
 assert_missing_pane_binary_rejected pi

-# #1256. Name resolution is not executable reachability. A script can resolve
-# while its /usr/bin/env shebang command is absent from PANE_PATH; reject that
-# before tmux creates the doomed session.
-: > "$TMUX_CALLS"
-HOME_UNEXECUTABLE="$ROOT/unexecutable-shebang"
-write_generated "$HOME_UNEXECUTABLE" "coder-unexecutable"
-rm -f "$HOME_UNEXECUTABLE/.npm-global/bin/mosaic"
-printf '#!/usr/bin/env mosaic-test-absent-interpreter\n' > \
-  "$HOME_UNEXECUTABLE/.npm-global/bin/mosaic"
-chmod +x "$HOME_UNEXECUTABLE/.npm-global/bin/mosaic"
-if output=$(MOSAIC_TEST_PANE_PID=$$ run_start "$HOME_UNEXECUTABLE" coder-unexecutable 2>&1); then
-  fail "launcher accepted a resolved mosaic script with an absent shebang command"
-fi
-echo "$output" | grep -qF 'code=unexecutable-binary' || \
-  fail "unexecutable shebang diagnostic missing: $output"
-echo "$output" | grep -qF 'mosaic-test-absent-interpreter' || \
-  fail "unexecutable shebang diagnostic did not name the missing dependency"
-if tr '\0' '\n' < "$TMUX_CALLS" | grep -qF new-session; then
-  fail "launcher created a session after its shebang dependency check failed"
-fi
-
 # #1241. tmux destroys a session when its pane command exits, so no pane PID a
 # second after new-session means the runtime died on startup. This used to be a
 # WARNING about the heartbeat sidecar followed by exit 0 — three layers above it
@@ -39,3 +39,20 @@ packages/mosaic/framework/tools/tmux/test-send-message-verdict.sh | requires rea
 # recorded judgement. These lines ARE that judgement, signed.)
 packages/mosaic/framework/tools/orchestrator/smoke-test.sh | behavior smoke checks for coord continue/run workflows, run manually by orchestrator seats; unmeasured in CI; #1017 burndown
 packages/mosaic/framework/tools/wake/validate-973/microtest-wake-assert.sh | #973 instrument self-test, run as a precondition of the validate-973 evidence procedure rather than as a standing CI suite; #1017 burndown candidate
+
+# --- tools/fleet: precondition is unsatisfiable in the CI image (#1271) ---
+# Signed by fred (sb-it-1-dt, 2026-08-16) at origin/next 476db12.
+# This suite asserts the launcher's behaviour when `mosaic` and `pi` are MISSING.
+# It shims fakes into $FAKE_BIN, but the constructed PANE_PATH always ends in the
+# real system path, so on a host that installs those binaries the missing-binary
+# cases cannot be measured at all. The suite's own guard (line 103) says so and
+# fails rather than reporting a pass it cannot back. That guard is correct.
+# The error was wiring the suite into CI: #1017 (c56483eb) enumerated it and
+# dropped this exclusion, and the CI image provides `pi` in the system path, so
+# it has failed on every pipeline since. Measured 2026-08-16 across pipelines
+# 2444 (#1256), 2438 (#1240) and 2441 (#1017-quality): exactly one FAIL line in
+# each full log, identical, this assertion; control `zzz-not-present-zzz` -> 0.
+# Burn-down and the full measurement are tracked in #1271; unwired by PR #1270.
+# Because test:framework-shell is one && chain and this sat at position 44 of 48,
+# the four suites after it had not run at all since the merge.
+packages/mosaic/framework/tools/fleet/test-start-agent-session.sh | precondition unsatisfiable in the CI image: asserts missing-binary behaviour, but PANE_PATH always ends in the system path and the image provides `pi` there; guard at line 103 fails by design rather than passing unmeasured. Burn down by controlling the tail of PANE_PATH inside the test. NOT by removing `pi` from the image: the CI image installs @earendil-works/[email protected] deliberately (measured in pipeline 2444's test-step log), and other suites depend on that pin. Burn-down tracked in #1271
@@ -25,7 +25,7 @@
    "lint": "eslint src",
    "typecheck": "tsc --noEmit",
    "test": "vitest run --passWithNoTests && pnpm run test:framework-shell",
-    "test:framework-shell": "bash framework/tools/quality/scripts/check-test-enumeration.sh && bash framework/tools/quality/scripts/test-check-test-enumeration.sh && python3 src/lease-broker/daemon_deadline_unittest.py && python3 src/lease-broker/normative_fragments_unittest.py && python3 src/lease-broker/promotion_binding_unittest.py && python3 src/lease-broker/promotion_trigger_unittest.py && python3 src/lease-broker/receipt_challenge_unittest.py && python3 src/lease-broker/context_recovery_unittest.py && python3 src/lease-broker/recovery_runtime_unittest.py && python3 src/lease-broker/recovery_b1_adversarial_unittest.py && python3 src/lease-broker/receipt_observer_client_unittest.py && python3 src/lease-broker/invariant_r_unittest.py && python3 src/lease-broker/framework_skill_portability_unittest.py && python3 src/mutator-gate/runtime_tools_unittest.py && python3 src/mutator-gate/runtime_launch_guard_unittest.py && python3 src/mutator-gate/version_coupling_unittest.py && python3 framework/tools/lease-broker/check-runtime-launches.py --root ../.. && bash framework/tools/codex/test-pr-diff-context.sh && bash framework/tools/qa/test-deps-preflight.sh && bash framework/tools/git/test-pr-review-gitea-comment.sh && bash framework/tools/git/test-pr-review-repo-host-override.sh && bash framework/tools/git/test-ci-queue-wait-branch-absent.sh && bash framework/tools/git/test-ci-queue-wait-tristate.sh && bash framework/tools/git/test-ci-queue-wait-github-checks.sh && bash framework/tools/git/test-pr-merge-queue-branch.sh && bash framework/tools/git/test-pr-merge-head-pin.sh && bash framework/tools/git/test-pr-merge-message-field.sh && bash framework/tools/git/test-git-credential-mosaic.sh && bash framework/tools/git/test-gitea-token-identity.sh && bash framework/tools/woodpecker/test-terminal-green-contract.sh && bash framework/tools/_scripts/test-install-ordering-guard.sh && bash framework/tools/_scripts/test-mosaic-init-rce.sh && bash framework/tools/tmux/agent-send.test.sh && bash framework/tools/wake/test-wake-store-ack.sh && bash framework/tools/wake/test-wake-store-enqueue-race.sh && bash framework/tools/wake/test-wake-digest-hmac.sh && bash framework/tools/wake/test-wake-digest-quarantine.sh && bash framework/tools/wake/test-wake-detector.sh && bash framework/tools/wake/test-wake-fn-oracle.sh && bash framework/tools/wake/test-wake-reconcile.sh && bash framework/tools/wake/test-wake-beacon.sh && bash framework/tools/wake/test-wake-preimage.sh && bash framework/tools/wake/test-wake-install.sh && bash framework/tools/fleet/test-start-agent-session.sh && bash framework/tools/glpi/test-list-http-status.sh && bash framework/tools/orchestrator/test-board-roll.sh && bash framework/tools/woodpecker/test-ci-wait-exit-matrix.sh && bash framework/tools/_scripts/test-fleet-transport-check.sh"
+    "test:framework-shell": "bash framework/tools/quality/scripts/check-test-enumeration.sh && bash framework/tools/quality/scripts/test-check-test-enumeration.sh && python3 src/lease-broker/daemon_deadline_unittest.py && python3 src/lease-broker/normative_fragments_unittest.py && python3 src/lease-broker/promotion_binding_unittest.py && python3 src/lease-broker/promotion_trigger_unittest.py && python3 src/lease-broker/receipt_challenge_unittest.py && python3 src/lease-broker/context_recovery_unittest.py && python3 src/lease-broker/recovery_runtime_unittest.py && python3 src/lease-broker/recovery_b1_adversarial_unittest.py && python3 src/lease-broker/receipt_observer_client_unittest.py && python3 src/lease-broker/invariant_r_unittest.py && python3 src/lease-broker/framework_skill_portability_unittest.py && python3 src/mutator-gate/runtime_tools_unittest.py && python3 src/mutator-gate/runtime_launch_guard_unittest.py && python3 src/mutator-gate/version_coupling_unittest.py && python3 framework/tools/lease-broker/check-runtime-launches.py --root ../.. && bash framework/tools/codex/test-pr-diff-context.sh && bash framework/tools/qa/test-deps-preflight.sh && bash framework/tools/git/test-pr-review-gitea-comment.sh && bash framework/tools/git/test-pr-review-repo-host-override.sh && bash framework/tools/git/test-ci-queue-wait-branch-absent.sh && bash framework/tools/git/test-ci-queue-wait-tristate.sh && bash framework/tools/git/test-ci-queue-wait-github-checks.sh && bash framework/tools/git/test-pr-merge-queue-branch.sh && bash framework/tools/git/test-pr-merge-head-pin.sh && bash framework/tools/git/test-pr-merge-message-field.sh && bash framework/tools/git/test-git-credential-mosaic.sh && bash framework/tools/git/test-gitea-token-identity.sh && bash framework/tools/woodpecker/test-terminal-green-contract.sh && bash framework/tools/_scripts/test-install-ordering-guard.sh && bash framework/tools/_scripts/test-mosaic-init-rce.sh && bash framework/tools/tmux/agent-send.test.sh && bash framework/tools/wake/test-wake-store-ack.sh && bash framework/tools/wake/test-wake-store-enqueue-race.sh && bash framework/tools/wake/test-wake-digest-hmac.sh && bash framework/tools/wake/test-wake-digest-quarantine.sh && bash framework/tools/wake/test-wake-detector.sh && bash framework/tools/wake/test-wake-fn-oracle.sh && bash framework/tools/wake/test-wake-reconcile.sh && bash framework/tools/wake/test-wake-beacon.sh && bash framework/tools/wake/test-wake-preimage.sh && bash framework/tools/wake/test-wake-install.sh && bash framework/tools/glpi/test-list-http-status.sh && bash framework/tools/orchestrator/test-board-roll.sh && bash framework/tools/woodpecker/test-ci-wait-exit-matrix.sh && bash framework/tools/_scripts/test-fleet-transport-check.sh"
  },
  "dependencies": {
    "@mosaicstack/brain": "workspace:*",
@@ -1,13 +1,9 @@
 import { chmod, mkdir, mkdtemp, rm, writeFile } from 'node:fs/promises';
 import { tmpdir } from 'node:os';
-import { join, resolve } from 'node:path';
+import { join } from 'node:path';
 import { Command } from 'commander';
 import { afterEach, describe, expect, it, vi } from 'vitest';
 import { type FleetReconcileDeps } from '../fleet/fleet-reconciler.js';
-import {
-  type FleetRuntimeProbeResult,
-  type FleetRuntimeProbeRunner,
-} from '../fleet/fleet-runtime-preflight.js';
 import { registerFleetCommand, type CommandResult, type FleetCommandDeps } from './fleet.js';

 const roster = `
@@ -69,15 +65,12 @@ function program(
  mosaicHome: string,
  runner: FleetCommandDeps['runner'],
  reconcileOverrides: Partial<FleetReconcileDeps> = {},
-  runtimeProbeRunner: FleetRuntimeProbeRunner = runtimeProbe('present'),
 ): Command {
  const result = new Command();
  result.exitOverride();
  registerFleetCommand(result, {
    mosaicHome,
    runner,
-    frameworkRoot: resolve(process.cwd(), 'framework'),
-    runtimeProbeRunner,
    reconcileDeps: {
      homeDirectory: '/home/mosaic',
      readHolderIdentity: async () => '11111111-1111-4111-8111-111111111111',
@@ -90,24 +83,6 @@ function program(
  return result;
 }

-function runtimeProbe(status: 'present' | 'missing'): FleetRuntimeProbeRunner {
-  return async (_command, args): Promise<FleetRuntimeProbeResult> => {
-    const binaryFlag = args.indexOf('--binary');
-    const binary = binaryFlag >= 0 ? args[binaryFlag + 1] : undefined;
-    const effectiveStatus = binary === 'mosaic' ? 'present' : status;
-    return {
-      stdout:
-        `pane_path\u0000/fixture/runtime-bin:/usr/bin:/bin\u0000status\u0000${effectiveStatus}\u0000` +
-        `binary_path\u0000${effectiveStatus === 'present' ? `/fixture/runtime-bin/${binary ?? 'unknown'}` : ''}\u0000` +
-        `dependency\u0000${effectiveStatus === 'present' ? 'node' : ''}\u0000` +
-        `probe_command\u0000${effectiveStatus === 'present' ? 'node --version' : ''}\u0000` +
-        `probe_exit\u0000${effectiveStatus === 'present' ? '0' : ''}\u0000probe_output\u0000\u0000`,
-      stderr: '',
-      exitCode: effectiveStatus === 'present' ? 0 : 69,
-    };
-  };
-}
-
 function capture(): string[] {
  const lines: string[] = [];
  vi.spyOn(console, 'log').mockImplementation((value: string): void => {
@@ -177,64 +152,13 @@ describe('mosaic fleet reconciler commands', (): void => {

    expect(lines.map((line: string): unknown => JSON.parse(line))).toMatchObject([
      { applied: false, lifecycle: 'not-applied' },
-      {
-        applied: false,
-        lifecycle: 'not-applied',
-        checks: {
-          fleetCliExecutable: [
-            {
-              check: 'fleet-cli-executable',
-              status: 'ok',
-              requestedBy: ['coder0'],
-              dependency: 'node',
-              probeCommand: 'node --version',
-            },
-          ],
-          fleetRuntimeAvailability: [
-            {
-              check: 'fleet-runtime-available',
-              runtime: 'pi',
-              status: 'ok',
-              requestedBy: ['coder0'],
-            },
-          ],
-        },
-      },
+      { applied: false, lifecycle: 'not-applied' },
    ]);
    expect(
      calls.every((call: string[]): boolean => call[0] !== 'systemctl' || call[2] === 'show'),
    ).toBe(true);
  });

-  it('reports a missing roster runtime as a named non-green doctor check', async (): Promise<void> => {
-    const home = await fleetHome();
-    const lines = capture();
-
-    await program(home, ownedRunner([]), {}, runtimeProbe('missing')).parseAsync([
-      'node',
-      'mosaic',
-      'fleet',
-      'doctor',
-    ]);
-
-    expect(JSON.parse(lines.pop() ?? '')).toMatchObject({
-      applied: false,
-      checks: {
-        fleetRuntimeAvailability: [
-          {
-            check: 'fleet-runtime-available',
-            runtime: 'pi',
-            status: 'missing',
-            requestedBy: ['coder0'],
-            panePath: '/fixture/runtime-bin:/usr/bin:/bin',
-            installCommand: 'npm install -g @earendil-works/pi-coding-agent',
-          },
-        ],
-      },
-    });
-    expect(process.exitCode).toBe(1);
-  });
-
  it.each(['start', 'stop', 'restart'] as const)(
    'uses exact roster-owned systemd targeting for %s',
    async (operation: 'start' | 'stop' | 'restart'): Promise<void> => {
@@ -8,18 +8,10 @@ import {
  type FleetReconcileCommand,
  type FleetReconcileDeps,
 } from '../fleet/fleet-reconciler.js';
-import {
-  inspectFleetRuntimeAvailability,
-  type FleetRuntimeInspection,
-  type FleetRuntimePreflightCheck,
-  type FleetRuntimeProbeRunner,
-} from '../fleet/fleet-runtime-preflight.js';
 import { parseRosterV2 } from '../fleet/roster-v2.js';

 export interface FleetReconcilerCommandDeps {
  readonly runner: CommandRunner;
-  readonly runtimeProbeRunner?: FleetRuntimeProbeRunner;
-  readonly frameworkRoot?: string;
  readonly mosaicHome?: string;
  readonly reconcileDeps?: Omit<FleetReconcileDeps, 'runner' | 'mosaicHome'>;
 }
@@ -79,10 +71,6 @@ export async function executeReconcilerCommand(
  const mosaicHome = resolveMosaicHome(fleetCommand, deps);
  const rosterPath = resolveRosterPath(fleetCommand, mosaicHome);
  const roster = parseRosterV2(await readFile(rosterPath, 'utf8'), 'yaml');
-  const runtimeInspection =
-    operation === 'doctor'
-      ? await inspectRuntimeAvailability(roster.agents, mosaicHome, deps)
-      : undefined;
  const mutating = operation === 'apply' || operation === 'reconcile' || isLifecycle(operation);
  const expectedGeneration = mutating
    ? parseExpectedGeneration(opts.expectedGeneration)
@@ -102,31 +90,8 @@ export async function executeReconcilerCommand(
      ...(deps.reconcileDeps ?? {}),
    },
  });
-  printJson(operation === 'doctor' ? { ...result, checks: runtimeInspection } : result);
-  const executableFailure =
-    runtimeInspection !== undefined &&
-    [...runtimeInspection.fleetCliExecutable, ...runtimeInspection.fleetRuntimeAvailability].some(
-      (check: FleetRuntimePreflightCheck): boolean => check.status !== 'ok',
-    );
-  process.exitCode =
-    result.recovery === undefined && result.cleanup === undefined && !executableFailure ? 0 : 1;
-}
-
-async function inspectRuntimeAvailability(
-  agents: readonly { readonly name: string; readonly runtime: string }[],
-  mosaicHome: string,
-  deps: FleetReconcilerCommandDeps,
-): Promise<FleetRuntimeInspection> {
-  if (deps.frameworkRoot === undefined || deps.runtimeProbeRunner === undefined) {
-    throw new Error('Fleet doctor runtime preflight dependencies are unavailable.');
-  }
-  return inspectFleetRuntimeAvailability({
-    mosaicHome,
-    agentEnvDir: join(mosaicHome, 'fleet', 'agents'),
-    helperPath: join(deps.frameworkRoot, 'tools', 'fleet', 'pane-runtime-path.sh'),
-    agents,
-    runner: deps.runtimeProbeRunner,
-  });
+  printJson(result);
+  process.exitCode = result.recovery === undefined && result.cleanup === undefined ? 0 : 1;
 }

 function isLifecycle(operation: FleetReconcileCommand): boolean {
@@ -4,7 +4,6 @@ import { tmpdir } from 'node:os';
 import { join, resolve } from 'node:path';
 import { Command } from 'commander';
 import { afterEach, describe, expect, it, vi } from 'vitest';
-import type { FleetRuntimeProbeRunner } from '../fleet/fleet-runtime-preflight.js';
 import { registerFleetCommand, type CommandResult, type CommandRunner } from './fleet.js';

 /**
@@ -70,7 +69,6 @@ agents:
 let tempHome: string | undefined;
 const savedHome = process.env.HOME;
 const savedMosaicHome = process.env.MOSAIC_HOME;
-const savedPath = process.env.PATH;

 afterEach(async (): Promise<void> => {
  vi.restoreAllMocks();
@@ -79,8 +77,6 @@ afterEach(async (): Promise<void> => {
  else process.env.HOME = savedHome;
  if (savedMosaicHome === undefined) delete process.env.MOSAIC_HOME;
  else process.env.MOSAIC_HOME = savedMosaicHome;
-  if (savedPath === undefined) delete process.env.PATH;
-  else process.env.PATH = savedPath;
  if (tempHome) await rm(tempHome, { recursive: true, force: true });
  tempHome = undefined;
 });
@@ -89,7 +85,7 @@ afterEach(async (): Promise<void> => {
 * A HOME with a roster-v2 fleet and nothing else — the greenfield shape, before
 * anything has been installed, applied or started.
 */
-async function v2Home(options: { withPaneRuntime?: boolean } = {}): Promise<string> {
+async function v2Home(): Promise<string> {
  tempHome = await mkdtemp(join(tmpdir(), 'mosaic-fleet-v2-dispatch-'));
  process.env.HOME = tempHome;
  delete process.env.MOSAIC_HOME;
@@ -101,12 +97,6 @@ async function v2Home(options: { withPaneRuntime?: boolean } = {}): Promise<stri
  await writeFile(join(mosaicHome, 'fleet', 'roles', 'code.md'), '`class: code`\n\n# code\n', {
    mode: 0o600,
  });
-  const runtimeDir = join(tempHome, '.npm-global', 'bin');
-  await mkdir(runtimeDir, { recursive: true });
-  await writeFile(join(runtimeDir, 'mosaic'), '#!/bin/sh\nexit 0\n', { mode: 0o755 });
-  if (options.withPaneRuntime !== false) {
-    await writeFile(join(runtimeDir, 'pi'), '#!/bin/sh\nexit 0\n', { mode: 0o755 });
-  }
  return mosaicHome;
 }

@@ -123,17 +113,10 @@ const greenfieldRunner: CommandRunner = async (command): Promise<CommandResult>
  return { stdout: '', stderr: '', exitCode: 1 };
 };

-function program(
-  runner: CommandRunner = greenfieldRunner,
-  runtimeProbeRunner?: FleetRuntimeProbeRunner,
-): Command {
+function program(runner: CommandRunner = greenfieldRunner): Command {
  const result = new Command();
  result.exitOverride();
-  registerFleetCommand(result, {
-    runner,
-    frameworkRoot: resolve(process.cwd(), 'framework'),
-    ...(runtimeProbeRunner === undefined ? {} : { runtimeProbeRunner }),
-  });
+  registerFleetCommand(result, { runner, frameworkRoot: resolve(process.cwd(), 'framework') });
  return result;
 }

@@ -183,93 +166,6 @@ describe('mosaic fleet ps — roster v2', (): void => {
 });

 describe('mosaic fleet install — roster v2', (): void => {
-  it('rejects a roster runtime missing from the pane PATH before installing any files', async (): Promise<void> => {
-    const mosaicHome = await v2Home({ withPaneRuntime: false });
-    const operatorBin = join(tempHome!, 'operator-bin');
-    await mkdir(operatorBin, { recursive: true });
-    await writeFile(join(operatorBin, 'pi'), '#!/bin/sh\nexit 0\n', { mode: 0o755 });
-    process.env.PATH = `${operatorBin}:${savedPath ?? '/usr/bin:/bin'}`;
-
-    let message = '';
-    try {
-      await program().parseAsync([
-        'node',
-        'mosaic',
-        'fleet',
-        '--mosaic-home',
-        mosaicHome,
-        'install',
-        '--no-enable',
-      ]);
-    } catch (error: unknown) {
-      message = error instanceof Error ? error.message : String(error);
-    }
-
-    expect(message).toContain('runtime=pi');
-    expect(message).toContain('requested_by=coder0,coder1');
-    expect(message).toContain('pane_path=');
-    expect(message).toContain('npm install -g @earendil-works/pi-coding-agent');
-    expect(message).not.toContain(operatorBin);
-    expect(
-      await exists(join(tempHome!, '.config', 'systemd', 'user', '[email protected]')),
-    ).toBe(false);
-    expect(await exists(join(mosaicHome, 'fleet', 'holder.id'))).toBe(false);
-    expect(await exists(join(mosaicHome, 'tools'))).toBe(false);
-  });
-
-  it('rejects resolved Node-shebang commands when Node is absent from the pane PATH', async (): Promise<void> => {
-    const mosaicHome = await v2Home();
-    const runtimeDir = join(tempHome!, '.npm-global', 'bin');
-    const nodeScript = '#!/usr/bin/env node\nconsole.log("should-not-run");\n';
-    await writeFile(join(runtimeDir, 'mosaic'), nodeScript, { mode: 0o755 });
-    await writeFile(join(runtimeDir, 'pi'), nodeScript, { mode: 0o755 });
-    await writeFile(join(tempHome!, '.npmrc'), `prefix=${join(tempHome!, 'absent-prefix')}\n`);
-    const isolatedSystemPath = join(tempHome!, 'system-bin');
-    await mkdir(isolatedSystemPath, { recursive: true });
-    const isolatedProbeRunner: FleetRuntimeProbeRunner = async (
-      command,
-      args,
-    ): Promise<CommandResult> =>
-      new Promise((settle) => {
-        const child = execFile(
-          command,
-          [...args, '--system-path', isolatedSystemPath],
-          { encoding: 'utf8' },
-          (error, stdout, stderr) => {
-            settle({
-              stdout,
-              stderr,
-              exitCode: child.exitCode ?? (error === null ? 0 : 1),
-            });
-          },
-        );
-      });
-
-    let message = '';
-    try {
-      await program(greenfieldRunner, isolatedProbeRunner).parseAsync([
-        'node',
-        'mosaic',
-        'fleet',
-        '--mosaic-home',
-        mosaicHome,
-        'install',
-        '--no-enable',
-      ]);
-    } catch (error: unknown) {
-      message = error instanceof Error ? error.message : String(error);
-    }
-
-    expect(message).toContain('check=fleet-cli-executable');
-    expect(message).toContain('binary=mosaic');
-    expect(message).toContain('dependency=node');
-    expect(message).toContain('check=fleet-runtime-available');
-    expect(message).toContain('runtime=pi');
-    expect(message).not.toContain('/usr/bin');
-    expect(await exists(join(mosaicHome, 'fleet', 'holder.id'))).toBe(false);
-    expect(await exists(join(mosaicHome, 'tools'))).toBe(false);
-  });
-
  it('places the tool files and unit templates', async (): Promise<void> => {
    const mosaicHome = await v2Home();
    capture();
@@ -287,11 +183,9 @@ describe('mosaic fleet install — roster v2', (): void => {
    ]) {
      expect(await exists(join(systemdUserDir, unit))).toBe(true);
    }
-    for (const tool of ['start-agent-session.sh', 'pane-runtime-path.sh']) {
-      const toolPath = join(mosaicHome, 'tools', 'fleet', tool);
-      expect(await exists(toolPath)).toBe(true);
-      expect((await stat(toolPath)).mode & 0o777).toBe(0o755);
-    }
+    const launcher = join(mosaicHome, 'tools', 'fleet', 'start-agent-session.sh');
+    expect(await exists(launcher)).toBe(true);
+    expect((await stat(launcher)).mode & 0o777).toBe(0o755);
  });

  it('writes NO generated env — that file belongs to the reconciler (#791)', async (): Promise<void> => {
@@ -1277,10 +1277,6 @@ describe('fleet command construction', () => {
    const home = await tempDir();
    process.env.HOME = home;
    delete process.env.MOSAIC_HOME;
-    const runtimeDir = join(home, '.npm-global', 'bin');
-    await mkdir(runtimeDir, { recursive: true });
-    await writeFile(join(runtimeDir, 'pi'), '#!/bin/sh\nexit 0\n', { mode: 0o755 });
-    await writeFile(join(runtimeDir, 'mosaic'), '#!/bin/sh\nexit 0\n', { mode: 0o755 });
    const mosaicHome = join(home, '.config', 'mosaic');
    const program = new Command();
    program.exitOverride();
@@ -1319,10 +1315,6 @@ describe('fleet command construction', () => {
    const originalHome = process.env.HOME;
    const home = await tempDir();
    process.env.HOME = home;
-    const runtimeDir = join(home, '.npm-global', 'bin');
-    await mkdir(runtimeDir, { recursive: true });
-    await writeFile(join(runtimeDir, 'pi'), '#!/bin/sh\nexit 0\n', { mode: 0o755 });
-    await writeFile(join(runtimeDir, 'mosaic'), '#!/bin/sh\nexit 0\n', { mode: 0o755 });
    const mosaicHome = join(home, '.config', 'mosaic');
    const agentEnvDir = join(mosaicHome, 'fleet', 'agents');
    const fleetDir = join(mosaicHome, 'fleet');
@@ -60,12 +60,6 @@ import {
  writeAgentEnvironmentProjection,
  writeManagedFleetRoster,
 } from '../fleet/generated-env-boundary.js';
-import {
-  assertFleetRuntimeAvailability,
-  FleetRuntimePreflightError,
-  inspectFleetRuntimeAvailability,
-  type FleetRuntimeProbeRunner,
-} from '../fleet/fleet-runtime-preflight.js';
 import { registerFleetBacklogCommand } from './fleet-backlog.js';
 import { registerFleetPersonaCommand } from './fleet-personas.js';
 import { registerFleetProfileCommand } from './fleet-profiles.js';
@@ -95,8 +89,6 @@ export type SleepFn = (ms: number) => Promise<void>;

 export interface FleetCommandDeps {
  runner?: CommandRunner;
-  /** Executes the pane-PATH helper under a clean launcher environment. */
-  runtimeProbeRunner?: FleetRuntimeProbeRunner;
  /** Injectable interactive runner for commands needing inherited TTY (e.g., `tmux attach`). */
  interactiveRunner?: InteractiveRunner;
  /**
@@ -1437,10 +1429,6 @@ export function isSendAccepted(capturedOutput: string): SendVerifyResult {

 export function registerFleetCommand(program: Command, deps: FleetCommandDeps = {}): Command {
  const runner = deps.runner ?? runCommand;
-  const runtimeProbeRunner: FleetRuntimeProbeRunner =
-    deps.runtimeProbeRunner ??
-    (async (command: string, args: readonly string[]): Promise<CommandResult> =>
-      runCommand(command, [...args]));
  const sleepFn = deps.sleepFn ?? defaultSleep;
  const paths = resolveFleetPaths(deps.mosaicHome);
  const frameworkRoot = deps.frameworkRoot ?? resolveFrameworkRoot();
@@ -1539,7 +1527,7 @@ export function registerFleetCommand(program: Command, deps: FleetCommandDeps =
    .description('Install local fleet tools and user systemd units')
    .option('--no-enable', 'Skip enabling units for boot-survival')
    .action(async (opts: { enable?: boolean }) => {
-      await installFleet(cmd, frameworkRoot, runtimeProbeRunner);
+      await installFleet(cmd, frameworkRoot);
      // Unit enablement needs agent names only, so it reads either version.
      const roster = await loadRosterReadModel(cmd);
      await enableFleetUnits(runner, roster, opts);
@@ -1550,7 +1538,7 @@ export function registerFleetCommand(program: Command, deps: FleetCommandDeps =
    .description('Install local fleet tools and user systemd units')
    .option('--no-enable', 'Skip enabling units for boot-survival')
    .action(async (opts: { enable?: boolean }) => {
-      await installFleet(cmd, frameworkRoot, runtimeProbeRunner);
+      await installFleet(cmd, frameworkRoot);
      // Unit enablement needs agent names only, so it reads either version.
      const roster = await loadRosterReadModel(cmd);
      await enableFleetUnits(runner, roster, opts);
@@ -2096,8 +2084,6 @@ export function registerFleetCommand(program: Command, deps: FleetCommandDeps =
  });
  registerFleetReconcilerCommands(cmd, {
    runner,
-    runtimeProbeRunner,
-    frameworkRoot,
    mosaicHome: deps.mosaicHome,
    reconcileDeps: deps.reconcileDeps,
  });
@@ -2363,68 +2349,18 @@ export function registerFleetAgentCommands(
    });
 }

-async function installFleet(
-  cmd: Command,
-  frameworkRoot: string,
-  runtimeProbeRunner: FleetRuntimeProbeRunner,
-): Promise<void> {
+async function installFleet(cmd: Command, frameworkRoot: string): Promise<void> {
  const activePaths = resolveFleetPaths(cmd.opts<{ mosaicHome: string }>().mosaicHome);
  assertDefaultMosaicHomeForSystemd(activePaths.mosaicHome);
-  // Read and preflight before the first mkdir/copy/chmod/write. A successful
-  // install must mean every roster runtime is executable in the eventual pane,
-  // not merely visible to the operator who invoked this command.
+  // Read model first: every file this function places is roster-independent, and
+  // the v1 parser would reject a v2 roster before any of them were written.
  const roster = await loadRosterReadModel(cmd);
-  const v1Roster = roster.version === 1 ? await loadRosterForCommand(cmd) : undefined;
-  const preflightV1Projections =
-    v1Roster === undefined
-      ? []
-      : await Promise.all(
-          v1Roster.agents.map((agent: FleetAgent) =>
-            prepareAgentEnvironmentProjection({
-              mosaicHome: activePaths.mosaicHome,
-              agentEnvDir: activePaths.agentEnvDir,
-              agentName: agent.name,
-              generated: generateAgentEnvValues(v1Roster, agent),
-            }),
-          ),
-        );
-  const preflightAgents =
-    v1Roster === undefined
-      ? roster.agents
-      : v1Roster.agents.map((agent: FleetAgent, index: number) => {
-          const prepared = preflightV1Projections[index];
-          if (prepared === undefined) {
-            throw new Error(`Missing prepared environment projection for ${agent.name}.`);
-          }
-          const local = parseAgentEnvironment(prepared.local, 'local');
-          return {
-            name: agent.name,
-            runtime: agent.runtime,
-            runtimeBin: local['MOSAIC_RUNTIME_BIN'] ?? '',
-          };
-        });
-  const runtimeInspection = await inspectFleetRuntimeAvailability({
-    mosaicHome: activePaths.mosaicHome,
-    agentEnvDir: activePaths.agentEnvDir,
-    helperPath: join(frameworkRoot, 'tools', 'fleet', 'pane-runtime-path.sh'),
-    agents: preflightAgents,
-    runner: runtimeProbeRunner,
-  });
-  try {
-    assertFleetRuntimeAvailability(runtimeInspection);
-  } catch (error: unknown) {
-    if (error instanceof FleetRuntimePreflightError) {
-      cmd.error(error.message, { code: 'fleet.runtime-preflight', exitCode: 1 });
-    }
-    throw error;
-  }
  await ensureFleetHolderIdentity(activePaths.mosaicHome);
  await mkdir(activePaths.fleetToolsDir, { recursive: true });
  await mkdir(activePaths.tmuxToolsDir, { recursive: true });
  await mkdir(activePaths.systemdUserDir, { recursive: true });

  const startAgentSessionPath = join(activePaths.fleetToolsDir, 'start-agent-session.sh');
-  const paneRuntimePath = join(activePaths.fleetToolsDir, 'pane-runtime-path.sh');
  const startInteractionServicePath = join(
    activePaths.fleetToolsDir,
    'start-interaction-service.sh',
@@ -2438,7 +2374,6 @@ async function installFleet(
  const agentSendPath = join(activePaths.tmuxToolsDir, 'agent-send.sh');
  const executableToolPaths = [
    startAgentSessionPath,
-    paneRuntimePath,
    startInteractionServicePath,
    startTmuxHolderPath,
    printInteractionPolicyPath,
@@ -2449,7 +2384,6 @@ async function installFleet(
    join(frameworkRoot, 'tools', 'fleet', 'start-agent-session.sh'),
    startAgentSessionPath,
  );
-  await copyFile(join(frameworkRoot, 'tools', 'fleet', 'pane-runtime-path.sh'), paneRuntimePath);
  await copyFile(
    join(frameworkRoot, 'tools', 'fleet', 'start-interaction-service.sh'),
    startInteractionServicePath,
@@ -2493,9 +2427,7 @@ async function installFleet(
    return;
  }

-  if (v1Roster === undefined) {
-    throw new Error('Roster version changed while installing fleet files.');
-  }
+  const v1Roster = await loadRosterForCommand(cmd);
  for (const agent of v1Roster.agents) {
    await writeAgentEnvironmentProjection({
      mosaicHome: activePaths.mosaicHome,
@@ -1,328 +0,0 @@
-import { spawn } from 'node:child_process';
-import { chmod, mkdir, mkdtemp, rm, writeFile } from 'node:fs/promises';
-import { tmpdir } from 'node:os';
-import { join, resolve } from 'node:path';
-import { afterEach, describe, expect, it } from 'vitest';
-import {
-  inspectFleetRuntimeAvailability,
-  type FleetRuntimeProbeResult,
-  type FleetRuntimeProbeRunner,
-} from './fleet-runtime-preflight.js';
-
-const helperPath = resolve(process.cwd(), 'framework', 'tools', 'fleet', 'pane-runtime-path.sh');
-let cleanup: string | undefined;
-
-afterEach(async (): Promise<void> => {
-  if (cleanup !== undefined) await rm(cleanup, { recursive: true, force: true });
-  cleanup = undefined;
-});
-
-interface FleetFixture {
-  readonly root: string;
-  readonly mosaicHome: string;
-  readonly agentEnvDir: string;
-  readonly runtimeDir: string;
-}
-
-async function fleetHome(): Promise<FleetFixture> {
-  const root = await mkdtemp(join(tmpdir(), 'mosaic-fleet-runtime-preflight-'));
-  cleanup = root;
-  const mosaicHome = join(root, '.config', 'mosaic');
-  const agentEnvDir = join(mosaicHome, 'fleet', 'agents');
-  const runtimeDir = join(root, '.npm-global', 'bin');
-  await mkdir(agentEnvDir, { recursive: true, mode: 0o700 });
-  await mkdir(runtimeDir, { recursive: true });
-  for (const directory of [mosaicHome, join(mosaicHome, 'fleet'), agentEnvDir]) {
-    await chmod(directory, 0o700);
-  }
-  await writeExecutable(runtimeDir, 'mosaic', '#!/bin/sh\nexit 0\n');
-  return { root, mosaicHome, agentEnvDir, runtimeDir };
-}
-
-async function writeExecutable(directory: string, name: string, content: string): Promise<void> {
-  await mkdir(directory, { recursive: true });
-  await writeFile(join(directory, name), content, { mode: 0o755 });
-}
-
-const processRunner: FleetRuntimeProbeRunner = async (
-  command: string,
-  args: readonly string[],
-): Promise<FleetRuntimeProbeResult> =>
-  new Promise((settle) => {
-    const child = spawn(command, [...args], { stdio: ['ignore', 'pipe', 'pipe'] });
-    let stdout = '';
-    let stderr = '';
-    child.stdout.setEncoding('utf8');
-    child.stderr.setEncoding('utf8');
-    child.stdout.on('data', (chunk: string): void => {
-      stdout += chunk;
-    });
-    child.stderr.on('data', (chunk: string): void => {
-      stderr += chunk;
-    });
-    child.on('error', (error: Error): void => {
-      settle({ stdout, stderr: `${stderr}${error.message}`, exitCode: 127 });
-    });
-    child.on('close', (code: number | null): void => {
-      settle({ stdout, stderr, exitCode: code ?? 1 });
-    });
-  });
-
-describe('fleet runtime preflight', (): void => {
-  it('executes one distinct pane runtime and aggregates every requesting roster row', async (): Promise<void> => {
-    const fixture = await fleetHome();
-    await writeExecutable(fixture.runtimeDir, 'pi', '#!/bin/sh\nexit 0\n');
-    let probes = 0;
-
-    const inspection = await inspectFleetRuntimeAvailability({
-      mosaicHome: fixture.mosaicHome,
-      agentEnvDir: fixture.agentEnvDir,
-      helperPath,
-      agents: [
-        { name: 'coder1', runtime: 'pi' },
-        { name: 'coder0', runtime: 'pi' },
-      ],
-      runner: async (command, args): Promise<FleetRuntimeProbeResult> => {
-        probes += 1;
-        return processRunner(command, args);
-      },
-    });
-
-    expect(probes).toBe(2);
-    expect(inspection.fleetCliExecutable).toEqual([
-      expect.objectContaining({
-        check: 'fleet-cli-executable',
-        status: 'ok',
-        requestedBy: ['coder0', 'coder1'],
-        binaryPath: join(fixture.runtimeDir, 'mosaic'),
-        dependency: '/bin/sh',
-      }),
-    ]);
-    expect(inspection.fleetRuntimeAvailability).toEqual([
-      expect.objectContaining({
-        check: 'fleet-runtime-available',
-        runtime: 'pi',
-        status: 'ok',
-        requestedBy: ['coder0', 'coder1'],
-        binaryPath: join(fixture.runtimeDir, 'pi'),
-        dependency: '/bin/sh',
-        installCommand: 'npm install -g @earendil-works/pi-coding-agent',
-      }),
-    ]);
-    expect(inspection.fleetRuntimeAvailability[0]?.panePath).toContain(fixture.runtimeDir);
-  });
-
-  it('returns an actionable non-green check when the pane PATH lacks the runtime', async (): Promise<void> => {
-    const fixture = await fleetHome();
-
-    const inspection = await inspectFleetRuntimeAvailability({
-      mosaicHome: fixture.mosaicHome,
-      agentEnvDir: fixture.agentEnvDir,
-      helperPath,
-      agents: [{ name: 'coder0', runtime: 'pi' }],
-      runner: processRunner,
-    });
-
-    expect(inspection.fleetCliExecutable[0]?.status).toBe('ok');
-    expect(inspection.fleetRuntimeAvailability).toEqual([
-      expect.objectContaining({
-        check: 'fleet-runtime-available',
-        runtime: 'pi',
-        status: 'missing',
-        requestedBy: ['coder0'],
-        installCommand: 'npm install -g @earendil-works/pi-coding-agent',
-      }),
-    ]);
-    expect(inspection.fleetRuntimeAvailability[0]?.panePath).not.toContain(
-      process.env['PATH'] ?? 'operator-path-absent',
-    );
-  });
-
-  it('executes the side-effect-free Node version probe for Node-shebang commands', async (): Promise<void> => {
-    const fixture = await fleetHome();
-    const nodeScript = '#!/usr/bin/env node\nconsole.log("should-not-run");\n';
-    await writeExecutable(fixture.runtimeDir, 'mosaic', nodeScript);
-    await writeExecutable(fixture.runtimeDir, 'pi', nodeScript);
-    await writeExecutable(
-      fixture.runtimeDir,
-      'node',
-      '#!/bin/sh\n[ "$1" = --version ] || exit 9\nprintf "v-fixture-node\\n"\n',
-    );
-
-    const inspection = await inspectFleetRuntimeAvailability({
-      mosaicHome: fixture.mosaicHome,
-      agentEnvDir: fixture.agentEnvDir,
-      helperPath,
-      agents: [{ name: 'coder0', runtime: 'pi' }],
-      runner: processRunner,
-    });
-
-    for (const check of [
-      ...inspection.fleetCliExecutable,
-      ...inspection.fleetRuntimeAvailability,
-    ]) {
-      expect(check).toMatchObject({
-        status: 'ok',
-        dependency: 'node',
-        probeCommand: 'node --version',
-        probeExit: 0,
-        probeOutput: 'v-fixture-node',
-      });
-    }
-  });
-
-  it('reddens when resolved Node-shebang commands cannot execute without pane Node', async (): Promise<void> => {
-    const fixture = await fleetHome();
-    const isolatedSystemPath = join(fixture.root, 'system-bin');
-    await mkdir(isolatedSystemPath, { recursive: true });
-    await writeFile(
-      join(fixture.root, '.npmrc'),
-      `prefix=${join(fixture.root, 'absent-prefix')}\n`,
-    );
-    const nodeScript = '#!/usr/bin/env node\nconsole.log("should-not-run");\n';
-    await writeExecutable(fixture.runtimeDir, 'mosaic', nodeScript);
-    await writeExecutable(fixture.runtimeDir, 'pi', nodeScript);
-
-    const inspection = await inspectFleetRuntimeAvailability({
-      mosaicHome: fixture.mosaicHome,
-      agentEnvDir: fixture.agentEnvDir,
-      helperPath,
-      agents: [{ name: 'coder0', runtime: 'pi' }],
-      runner: processRunner,
-      systemPath: isolatedSystemPath,
-    });
-
-    expect(inspection.fleetCliExecutable).toEqual([
-      expect.objectContaining({
-        check: 'fleet-cli-executable',
-        status: 'unexecutable',
-        binaryPath: join(fixture.runtimeDir, 'mosaic'),
-        dependency: 'node',
-        probeCommand: 'node --version',
-      }),
-    ]);
-    expect(inspection.fleetRuntimeAvailability).toEqual([
-      expect.objectContaining({
-        check: 'fleet-runtime-available',
-        runtime: 'pi',
-        status: 'unexecutable',
-        binaryPath: join(fixture.runtimeDir, 'pi'),
-        dependency: 'node',
-        probeCommand: 'node --version',
-      }),
-    ]);
-    expect(inspection.fleetCliExecutable[0]?.probeOutput).toBe(
-      'shebang command is not on the pane PATH',
-    );
-    expect(inspection.fleetCliExecutable[0]?.panePath).not.toContain('/usr/bin');
-  });
-
-  it('keeps distinct effective local runtime-bin paths as distinct checks', async (): Promise<void> => {
-    const fixture = await fleetHome();
-    const firstBin = join(fixture.root, 'first-bin');
-    const secondBin = join(fixture.root, 'second-bin');
-    for (const override of [
-      { agent: 'coder0', runtimeBin: firstBin },
-      { agent: 'coder1', runtimeBin: secondBin },
-    ]) {
-      await writeExecutable(override.runtimeBin, 'pi', '#!/bin/sh\nexit 0\n');
-      await writeFile(
-        join(fixture.agentEnvDir, `${override.agent}.env.local`),
-        `MOSAIC_RUNTIME_BIN=${override.runtimeBin}\n`,
-        { mode: 0o600 },
-      );
-    }
-
-    const inspection = await inspectFleetRuntimeAvailability({
-      mosaicHome: fixture.mosaicHome,
-      agentEnvDir: fixture.agentEnvDir,
-      helperPath,
-      agents: [
-        { name: 'coder0', runtime: 'pi' },
-        { name: 'coder1', runtime: 'pi' },
-      ],
-      runner: processRunner,
-    });
-
-    expect(inspection.fleetCliExecutable).toHaveLength(2);
-    expect(inspection.fleetRuntimeAvailability).toHaveLength(2);
-    expect(inspection.fleetRuntimeAvailability.map((check) => check.requestedBy)).toEqual([
-      ['coder0'],
-      ['coder1'],
-    ]);
-    expect(inspection.fleetRuntimeAvailability.map((check) => check.binaryPath)).toEqual([
-      join(firstBin, 'pi'),
-      join(secondBin, 'pi'),
-    ]);
-  });
-
-  it('reports each distinct roster runtime with its exact install command', async (): Promise<void> => {
-    const fixture = await fleetHome();
-    let probes = 0;
-
-    const inspection = await inspectFleetRuntimeAvailability({
-      mosaicHome: fixture.mosaicHome,
-      agentEnvDir: fixture.agentEnvDir,
-      helperPath,
-      agents: [
-        { name: 'pi-seat', runtime: 'pi' },
-        { name: 'claude-seat', runtime: 'claude' },
-        { name: 'codex-seat', runtime: 'codex' },
-        { name: 'opencode-seat', runtime: 'opencode' },
-      ],
-      runner: async (): Promise<FleetRuntimeProbeResult> => {
-        probes += 1;
-        return {
-          stdout:
-            'pane_path\u0000/fixture/bin:/usr/bin:/bin\u0000status\u0000missing\u0000' +
-            'binary_path\u0000\u0000probe_exit\u0000\u0000probe_output\u0000\u0000',
-          stderr: '',
-          exitCode: 69,
-        };
-      },
-    });
-
-    expect(probes).toBe(5);
-    expect(
-      inspection.fleetRuntimeAvailability.map((check) => ({
-        runtime: check.runtime,
-        installCommand: check.installCommand,
-      })),
-    ).toEqual([
-      {
-        runtime: 'claude',
-        installCommand: 'curl -fsSL https://claude.ai/install.sh | bash',
-      },
-      {
-        runtime: 'codex',
-        installCommand: 'npm install -g @openai/codex',
-      },
-      {
-        runtime: 'opencode',
-        installCommand: 'npm install -g opencode-ai',
-      },
-      {
-        runtime: 'pi',
-        installCommand: 'npm install -g @earendil-works/pi-coding-agent',
-      },
-    ]);
-  });
-
-  it('fails closed when the shared helper returns malformed evidence', async (): Promise<void> => {
-    const fixture = await fleetHome();
-
-    await expect(
-      inspectFleetRuntimeAvailability({
-        mosaicHome: fixture.mosaicHome,
-        agentEnvDir: fixture.agentEnvDir,
-        helperPath,
-        agents: [{ name: 'coder0', runtime: 'pi' }],
-        runner: async (): Promise<FleetRuntimeProbeResult> => ({
-          stdout: 'not-a-field-protocol',
-          stderr: '',
-          exitCode: 0,
-        }),
-      }),
-    ).rejects.toThrow('malformed field output');
-  });
-});
@@ -1,362 +0,0 @@
-import { homedir } from 'node:os';
-import { getInstallInstructions } from '../runtime/detector.js';
-import type { RuntimeName } from '../types.js';
-import { compareCodePoints } from './deterministic-order.js';
-import {
-  GENERATED_AGENT_ENV_SUPPORTED_RUNTIMES,
-  readAgentLocalEnvironment,
-} from './generated-env-boundary.js';
-
-const RUNTIME_SET = new Set<string>(GENERATED_AGENT_ENV_SUPPORTED_RUNTIMES);
-
-export interface FleetRuntimeRequestedAgent {
-  readonly name: string;
-  readonly runtime: string;
-  /** Planned effective local override, when provisioning has already prepared it. */
-  readonly runtimeBin?: string;
-}
-
-export interface FleetRuntimeProbeResult {
-  readonly stdout: string;
-  readonly stderr: string;
-  readonly exitCode: number;
-}
-
-export type FleetRuntimeProbeRunner = (
-  command: string,
-  args: readonly string[],
-) => Promise<FleetRuntimeProbeResult>;
-
-export interface FleetRuntimePreflightOptions {
-  readonly mosaicHome: string;
-  readonly agentEnvDir: string;
-  readonly helperPath: string;
-  readonly agents: readonly FleetRuntimeRequestedAgent[];
-  readonly runner: FleetRuntimeProbeRunner;
-  /** Test-only system suffix; production and the launcher use the helper default. */
-  readonly systemPath?: string;
-}
-
-export type FleetExecutableStatus = 'ok' | 'missing' | 'unexecutable';
-
-interface FleetExecutableEvidence {
-  readonly status: FleetExecutableStatus;
-  readonly panePath: string;
-  readonly binaryPath?: string;
-  readonly dependency?: string;
-  readonly probeCommand?: string;
-  readonly probeExit?: number;
-  readonly probeOutput?: string;
-}
-
-export interface FleetCliExecutableCheck extends FleetExecutableEvidence {
-  readonly check: 'fleet-cli-executable';
-  readonly binary: 'mosaic';
-  readonly requestedBy: readonly string[];
-}
-
-export interface FleetRuntimeCheck extends FleetExecutableEvidence {
-  readonly check: 'fleet-runtime-available';
-  readonly runtime: RuntimeName;
-  readonly requestedBy: readonly string[];
-  readonly installCommand: string;
-}
-
-export type FleetRuntimePreflightCheck = FleetCliExecutableCheck | FleetRuntimeCheck;
-
-export interface FleetRuntimeInspection {
-  readonly fleetCliExecutable: readonly FleetCliExecutableCheck[];
-  readonly fleetRuntimeAvailability: readonly FleetRuntimeCheck[];
-}
-
-interface EffectiveAgent {
-  readonly name: string;
-  readonly runtime: RuntimeName;
-  readonly runtimeBin: string;
-}
-
-interface PaneProbeGroup {
-  readonly runtimeBin: string;
-  readonly requestedBy: string[];
-}
-
-interface RuntimeProbeGroup extends PaneProbeGroup {
-  readonly runtime: RuntimeName;
-}
-
-interface BinaryProbeRequest {
-  readonly binary: string;
-  readonly runtimeBin: string;
-}
-
-export class FleetRuntimePreflightError extends Error {
-  readonly checks: readonly FleetRuntimePreflightCheck[];
-
-  constructor(checks: readonly FleetRuntimePreflightCheck[]) {
-    super(formatFleetRuntimePreflightError(checks));
-    this.name = FleetRuntimePreflightError.name;
-    this.checks = checks;
-  }
-}
-
-export class FleetRuntimeProbeError extends Error {
-  constructor(message: string) {
-    super(message);
-    this.name = FleetRuntimeProbeError.name;
-  }
-}
-
-/**
- * Proves the fleet CLI and every distinct runtime/effective-bin pair resolve
- * with an executable shebang interpreter through the eventual pane PATH. The
- * helper runs under the unit's clean launcher environment, so operator PATH can
- * neither create a false green nor provide a hidden interpreter.
- */
-export async function inspectFleetRuntimeAvailability(
-  options: FleetRuntimePreflightOptions,
-): Promise<FleetRuntimeInspection> {
-  const agents = await resolveEffectiveAgents(options);
-  const paneGroups = groupPaneRequests(agents);
-  const runtimeGroups = groupRuntimeRequests(agents);
-
-  const fleetCliExecutable: FleetCliExecutableCheck[] = [];
-  for (const group of paneGroups) {
-    const evidence = await probeBinary(options, {
-      binary: 'mosaic',
-      runtimeBin: group.runtimeBin,
-    });
-    fleetCliExecutable.push({
-      check: 'fleet-cli-executable',
-      binary: 'mosaic',
-      requestedBy: sortedRequestedBy(group.requestedBy),
-      ...evidence,
-    });
-  }
-
-  const fleetRuntimeAvailability: FleetRuntimeCheck[] = [];
-  for (const group of runtimeGroups) {
-    const evidence = await probeBinary(options, {
-      binary: group.runtime,
-      runtimeBin: group.runtimeBin,
-    });
-    fleetRuntimeAvailability.push({
-      check: 'fleet-runtime-available',
-      runtime: group.runtime,
-      requestedBy: sortedRequestedBy(group.requestedBy),
-      installCommand: getInstallInstructions(group.runtime),
-      ...evidence,
-    });
-  }
-
-  return Object.freeze({
-    fleetCliExecutable: Object.freeze(fleetCliExecutable),
-    fleetRuntimeAvailability: Object.freeze(fleetRuntimeAvailability),
-  });
-}
-
-export function assertFleetRuntimeAvailability(inspection: FleetRuntimeInspection): void {
-  const checks: FleetRuntimePreflightCheck[] = [
-    ...inspection.fleetCliExecutable,
-    ...inspection.fleetRuntimeAvailability,
-  ];
-  const failures = checks.filter(
-    (check: FleetRuntimePreflightCheck): boolean => check.status !== 'ok',
-  );
-  if (failures.length > 0) throw new FleetRuntimePreflightError(failures);
-}
-
-export function formatFleetRuntimePreflightError(
-  checks: readonly FleetRuntimePreflightCheck[],
-): string {
-  const lines = ['Fleet runtime preflight failed:'];
-  for (const check of checks) {
-    const dependency = check.dependency === undefined ? '' : ` dependency=${check.dependency}`;
-    const probe = check.probeCommand === undefined ? '' : ` dependency_probe=${check.probeCommand}`;
-    const execution =
-      check.status === 'unexecutable'
-        ? ` probe_exit=${check.probeExit?.toString() ?? 'not-run'} ` +
-          `probe_output=${JSON.stringify(check.probeOutput ?? '')}`
-        : '';
-    if (check.check === 'fleet-cli-executable') {
-      lines.push(
-        `check=${check.check} binary=${check.binary} ` +
-          `requested_by=${check.requestedBy.join(',')} pane_path=${check.panePath}` +
-          `${dependency}${probe}${execution} ` +
-          'action=repair the Mosaic installation until its pane dependencies resolve',
-      );
-      continue;
-    }
-    lines.push(
-      `check=${check.check} runtime=${check.runtime} ` +
-        `requested_by=${check.requestedBy.join(',')} pane_path=${check.panePath}` +
-        `${dependency}${probe}${execution} install_command=${check.installCommand}`,
-    );
-  }
-  return lines.join('\n');
-}
-
-async function resolveEffectiveAgents(
-  options: FleetRuntimePreflightOptions,
-): Promise<readonly EffectiveAgent[]> {
-  const agents: EffectiveAgent[] = [];
-  for (const agent of options.agents) {
-    if (!isRuntimeName(agent.runtime)) {
-      throw new FleetRuntimeProbeError(`Unsupported fleet runtime: ${agent.runtime}`);
-    }
-    const runtimeBin =
-      agent.runtimeBin ??
-      (
-        await readAgentLocalEnvironment({
-          mosaicHome: options.mosaicHome,
-          agentEnvDir: options.agentEnvDir,
-          agentName: agent.name,
-        })
-      )['MOSAIC_RUNTIME_BIN'] ??
-      '';
-    agents.push({ name: agent.name, runtime: agent.runtime, runtimeBin });
-  }
-  return agents;
-}
-
-function groupPaneRequests(agents: readonly EffectiveAgent[]): readonly PaneProbeGroup[] {
-  const groups = new Map<string, PaneProbeGroup>();
-  for (const agent of agents) {
-    const current = groups.get(agent.runtimeBin);
-    if (current === undefined) {
-      groups.set(agent.runtimeBin, { runtimeBin: agent.runtimeBin, requestedBy: [agent.name] });
-    } else {
-      current.requestedBy.push(agent.name);
-    }
-  }
-  return [...groups.values()].sort((left, right): number =>
-    compareCodePoints(left.runtimeBin, right.runtimeBin),
-  );
-}
-
-function groupRuntimeRequests(agents: readonly EffectiveAgent[]): readonly RuntimeProbeGroup[] {
-  const groups = new Map<string, RuntimeProbeGroup>();
-  for (const agent of agents) {
-    const key = JSON.stringify([agent.runtime, agent.runtimeBin]);
-    const current = groups.get(key);
-    if (current === undefined) {
-      groups.set(key, {
-        runtime: agent.runtime,
-        runtimeBin: agent.runtimeBin,
-        requestedBy: [agent.name],
-      });
-    } else {
-      current.requestedBy.push(agent.name);
-    }
-  }
-  return [...groups.values()].sort((left, right): number =>
-    compareCodePoints(
-      `${left.runtime}\u0000${left.runtimeBin}`,
-      `${right.runtime}\u0000${right.runtimeBin}`,
-    ),
-  );
-}
-
-async function probeBinary(
-  options: FleetRuntimePreflightOptions,
-  probe: BinaryProbeRequest,
-): Promise<FleetExecutableEvidence> {
-  const args = [
-    '-i',
-    `HOME=${process.env['HOME'] ?? homedir()}`,
-    'PATH=/usr/bin:/bin',
-    `MOSAIC_HOME=${options.mosaicHome}`,
-    '/bin/bash',
-    '--noprofile',
-    '--norc',
-    options.helperPath,
-    '--mosaic-home',
-    options.mosaicHome,
-    '--binary',
-    probe.binary,
-    '--check-executable',
-  ];
-  if (probe.runtimeBin !== '') args.push('--runtime-bin', probe.runtimeBin);
-  if (options.systemPath !== undefined) args.push('--system-path', options.systemPath);
-
-  const result = await options.runner('/usr/bin/env', args);
-  const fields = parseNulFields(result.stdout);
-  const panePath = requiredField(fields, 'pane_path');
-  const status = requiredField(fields, 'status');
-  if (result.exitCode === 0 && status === 'present') {
-    return executableEvidence('ok', panePath, fields);
-  }
-  if (result.exitCode === 69 && status === 'missing') {
-    return { status: 'missing', panePath };
-  }
-  if (result.exitCode === 70 && status === 'unexecutable') {
-    return executableEvidence('unexecutable', panePath, fields);
-  }
-  throw new FleetRuntimeProbeError(
-    `Fleet executable probe failed: binary=${probe.binary} exit=${result.exitCode.toString()} ` +
-      `stderr=${JSON.stringify(result.stderr.trim())}`,
-  );
-}
-
-function executableEvidence(
-  status: 'ok' | 'unexecutable',
-  panePath: string,
-  fields: ReadonlyMap<string, string>,
-): FleetExecutableEvidence {
-  const dependency = requiredField(fields, 'dependency');
-  const probeCommand = requiredField(fields, 'probe_command');
-  const probeExit = requiredField(fields, 'probe_exit');
-  const probeOutput = requiredField(fields, 'probe_output');
-  return {
-    status,
-    panePath,
-    binaryPath: requiredField(fields, 'binary_path'),
-    ...(dependency === '' ? {} : { dependency }),
-    ...(probeCommand === '' ? {} : { probeCommand }),
-    ...(probeExit === '' ? {} : { probeExit: parseProbeExit(probeExit) }),
-    ...(probeOutput === '' ? {} : { probeOutput }),
-  };
-}
-
-function sortedRequestedBy(requestedBy: readonly string[]): readonly string[] {
-  return Object.freeze(
-    [...requestedBy].sort((left: string, right: string): number => compareCodePoints(left, right)),
-  );
-}
-
-function parseNulFields(source: string): ReadonlyMap<string, string> {
-  const parts = source.split('\u0000');
-  if (parts.at(-1) === '') parts.pop();
-  if (parts.length % 2 !== 0) {
-    throw new FleetRuntimeProbeError('Fleet runtime probe returned malformed field output.');
-  }
-  const fields = new Map<string, string>();
-  for (let index = 0; index < parts.length; index += 2) {
-    const key = parts[index];
-    const value = parts[index + 1];
-    if (key === undefined || value === undefined || key === '' || fields.has(key)) {
-      throw new FleetRuntimeProbeError('Fleet runtime probe returned malformed field output.');
-    }
-    fields.set(key, value);
-  }
-  return fields;
-}
-
-function requiredField(fields: ReadonlyMap<string, string>, key: string): string {
-  const value = fields.get(key);
-  if (value === undefined) {
-    throw new FleetRuntimeProbeError(`Fleet runtime probe omitted ${key}.`);
-  }
-  return value;
-}
-
-function parseProbeExit(value: string): number {
-  const exitCode = Number(value);
-  if (!Number.isSafeInteger(exitCode) || exitCode < 0) {
-    throw new FleetRuntimeProbeError('Fleet runtime probe returned an invalid execution status.');
-  }
-  return exitCode;
-}
-
-function isRuntimeName(value: string): value is RuntimeName {
-  return RUNTIME_SET.has(value);
-}
@@ -25,12 +25,6 @@ export interface AgentGeneratedProjectionDeletionOptions {
  readonly agentName: string;
 }

-export interface AgentLocalEnvironmentReadOptions {
-  readonly mosaicHome: string;
-  readonly agentEnvDir: string;
-  readonly agentName: string;
-}
-
 export interface AgentEnvironmentProjectionResult {
  readonly generatedPath: string;
  readonly localPath: string;
@@ -151,23 +145,6 @@ export function parseAgentEnvironment(
  return Object.freeze(values);
 }

-/**
- * Reads one agent's optional local overrides through the same path, file-type,
- * permission, key, and value boundary used by projection/launch handling.
- */
-export async function readAgentLocalEnvironment(
-  options: AgentLocalEnvironmentReadOptions,
-): Promise<Readonly<Record<string, string>>> {
-  if (!AGENT_NAME.test(options.agentName)) {
-    throw new AgentEnvBoundaryError('unsafe-agent-name', 'MOSAIC_AGENT_NAME', options.agentName);
-  }
-  await validatePrivateProjectionDirectory(options.mosaicHome, options.agentEnvDir);
-  const source = await readOptionalPrivateFile(
-    join(options.agentEnvDir, `${options.agentName}.env.local`),
-  );
-  return source === undefined ? Object.freeze({}) : parseAgentEnvironment(source, 'local');
-}
-
 /** Renders the roster-derived generated projection in a stable, complete key order. */
 export function renderGeneratedAgentEnvironment(values: Readonly<Record<string, string>>): string {
  const normalized = normalizeGeneratedValues(values);
@@ -19,7 +19,7 @@ const RUNTIME_DEFS: Record<
    label: 'Claude Code',
    command: 'claude',
    versionFlag: '--version',
-    installHint: 'curl -fsSL https://claude.ai/install.sh | bash',
+    installHint: 'npm install -g @anthropic-ai/claude-code',
  },
  codex: {
    label: 'Codex',
@@ -31,13 +31,13 @@ const RUNTIME_DEFS: Record<
    label: 'OpenCode',
    command: 'opencode',
    versionFlag: 'version',
-    installHint: 'npm install -g opencode-ai',
+    installHint: 'See https://opencode.ai for install instructions',
  },
  pi: {
    label: 'Pi',
    command: 'pi',
    versionFlag: '--version',
-    installHint: 'npm install -g @earendil-works/pi-coding-agent',
+    installHint: 'curl -fsSL https://pi.dev/install.sh | sh',
  },
 };
Author	SHA1	Message	Date
fargo	2097379e25	fix(macp): fail-closed typed gate states — no placeholder/empty-command passes (#1275 ) ci/woodpecker/pr/ci Pipeline was successful Details RI-N2 / SDLC-D-035. Every GateResult now carries a typed status discriminator (passed\|failed\|simulated\|waiting\|capability_failure); passed:true remains true only for really-executed, really-green gates. - ci-pipeline without a CI provider → capability_failure (MACP_NO_CI_PIPELINE), never the placeholder pass - empty-command gate → capability_failure (MACP_NO_COMMAND / MACP_NO_REVIEWER), and runGates no longer silently skips it - manual gate type waits (MACP_AUTHORITY_REQUIRED) — neither pass nor fail - explicit simulation only (simulate option / --simulate): typed simulated results can never make the aggregate passed (RunGatesResult.state) - CLI stubs (tasks list, submit, events tail) exit nonzero with typed MACP_NOT_IMPLEMENTED; macp gate is now wired to runGates with --simulate - legacy __tests__/gate-runner.test.ts consolidated into src/gate-runner.spec.ts (root eslint project service does not cover packages/macp/__tests__)	2026-08-17 16:40:16 -05:00
jason.woltje	8199261caa	Merge pull request 'fix(ci): unwire test-start-agent-session.sh, restore its signed exclusion — unblocks every PR on next' (#1270 ) from fix/1269-ci-chain-unblock into next ci/woodpecker/push/publish Pipeline failed Details Reviewed-on: #1270	2026-08-17 20:44:59 +00:00
fred	57a2f2b40e	docs(ci): point the exclusion at tracking issue #1271 , not the closed first filing ci/woodpecker/pr/ci Pipeline was successful Details The first PR for this change was filed under the retired mos-dt-0 principal (pr-create.sh has no --login flag and find_tea_login_for_host returns the first host match) and was closed and refiled as #1270. That left in-tree references pointing at a closed duplicate PR rather than at the burn-down issue, which is the wrong target for them anyway: the open design question belongs on #1271.	2026-08-16 18:03:02 -05:00
fred	93c1de51e1	fix(ci): unwire test-start-agent-session.sh, restore its signed exclusion (#1269 ) ci/woodpecker/pr/ci Pipeline was canceled Details The `test` step has failed on every `next` pipeline since #1017 on exactly one assertion, and it is the same one on unrelated PRs: FAIL: host provides 'pi' in the system path; missing-binary cases are not measurable here (framework/tools/fleet/test-start-agent-session.sh:103) Measured 2026-08-16 across pipelines 2444 (#1256), 2438 (#1240) and 2441 (#1017-quality): exactly one FAIL line in each full log, identical, this line. Control `zzz-not-present-zzz` -> 0 on all three. Cause. #1241 (`5c35a250`) added the guard: the suite shims fake mosaic/pi/npm into $FAKE_BIN, but the constructed PANE_PATH always ends in the real system path, so on a host that installs those binaries the missing-binary cases cannot be measured and a green run would mean nothing. The guard says so instead of passing. Its own pipeline 2430 was green only because the suite was CI-excluded at the time, so the guard had never run in CI. #1017 (`c56483eb`) then enumerated it and dropped the exclusion. The CI image installs @earendil-works/[email protected].1 on purpose, so the precondition is unsatisfiable there. Both commits are mine. The guard is correct and is not being softened. A check that cannot measure its property and reports success is the failure mode this repo has been cataloguing all week; the error was wiring the suite into an image that violates its precondition, so the wiring is what gets reverted. Second effect, which is the reason this cost a day rather than an hour: test:framework-shell is one && chain and this sat at position 44 of 48, so glpi/test-list-http-status.sh, orchestrator/test-board-roll.sh, woodpecker/test-ci-wait-exit-matrix.sh and _scripts/test-fleet-transport-check.sh have not run at all since the merge. The pipeline reported one failure, never "one failure plus four unrun". All four are green when run directly on sb-it-1-dt, so the mask hid nothing broken -- but that is a local result on one host, not a CI-image result. Verification, with controls: - enumeration guard OK (population 52, enumerated 36, signed-excluded 16). - control A, exclusion line removed while unwired -> FAIL UNENUMERATED. - control B, exclusion line kept while rewired -> FAIL CONTRADICTORY EXCLUSION. The gate discriminates in both directions, so its OK is load-bearing. - the four formerly-masked suites: rc=0 each, run directly. - the full chain cannot be run to completion on sb-it-1-dt: it stops earlier, at the lease-broker Invariant R test, because this host carries the quarantined operator-global pi 0.84.2 against a measured 0.84.1. That is host-specific and out of scope here -- CI pins 0.84.1, and the single FAIL line in those three pipelines proves positions 1-43 passed there. Burn-down is to control the tail of PANE_PATH inside the test, not to remove pi from the image. Recorded in the exclusion reason and in #1269.	2026-08-16 17:58:49 -05:00