feat: add quality-review dispatch hook to intercept agent:stopped events

When an execute-mode agent stops with task_complete and the initiative has
qualityReview=true, the orchestrator now spawns a fresh execute-mode agent
to run /simplify on changed .ts/.tsx/.js files before marking the task
completed. The task transitions through quality_review status as a recursion
guard so the review agent's stop event is handled normally.

- Add apps/server/execution/quality-review.ts with three exported functions:
  computeQualifyingFiles, shouldRunQualityReview, runQualityReview
- Add apps/server/execution/quality-review.test.ts (28 tests)
- Update ExecutionOrchestrator to accept agentManager, replace
  handleAgentStopped with quality-review-aware logic, add getRepoPathForTask
- Update orchestrator.test.ts with 3 quality-review integration tests
- Update container.ts to pass agentManager to ExecutionOrchestrator
- Update docs/dispatch-events.md to reflect new agent:stopped behavior

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/dispatch-events.md

@@ -113,7 +113,7 @@ InitiativeChangesRequestedEvent { initiativeId, phaseId, taskId }
 | Event | Action |
 |-------|--------|
 | `phase:queued` | Dispatch ready phases → dispatch their tasks to idle agents |
-| `agent:stopped` | Auto-complete task (unless user_requested), re-dispatch queued tasks (freed agent slot) |
+| `agent:stopped` | When `task_complete`: check `shouldRunQualityReview()` — if conditions met, spawn quality-review agent and set task to `quality_review`; otherwise auto-complete task. Manual stops (`user_requested`) are skipped. Re-dispatch queued tasks after either path. |
 | `agent:crashed` | Auto-retry crashed task up to `MAX_TASK_RETRIES` (3). Increments `retryCount`, resets status to `pending`, re-queues. Exceeding retries leaves task `in_progress` for manual intervention. |
 | `task:completed` | Merge task branch (if branch exists), check phase completion, dispatch next queued task |