feat: add Orchestrator Loop — phased plan execution with team agents

Adds a new autonomous loop that accepts high-level goals, generates
phased execution plans via AI, and executes them step-by-step with
verification gates between phases.

Core components:
- OrchestratorLoop: state machine (idle→planning→approval→executing→verifying→completed)
- OrchestratorPlanner: plan generation via PlanOrchestrator, Kahn's algorithm phase grouping
- OrchestratorVerifier: phase verification (strict/moderate/lenient modes)
- Prompt templates for phase execution, team delegation, verification, replanning

API (10 endpoints):
- POST start/approve/reject/pause/resume/stop
- GET status/plan
- POST phase/:id/skip, phase/:id/retry

Frontend: orchestrator-panel.js with SSE-driven state, phase progress, task tracking

Tests: 22 tests (18 route + 4 unit), all passing. Typecheck/lint/format clean.

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

test/mocks/mock-route-context.ts

@@ -113,6 +113,10 @@ export function createMockRouteContext(options?: { sessionId?: string }) {
     qrAuthFailures: null,
     // https already declared above in ConfigPort (shared property)
 
+    // -- OrchestratorPort --
+    orchestratorLoop: null,
+    initOrchestratorLoop: vi.fn(),
+
     // Convenience accessors (not part of any port interface)
     _session: session,
     _sessionId: sessionId,