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>

src/state-store.ts

@@ -547,6 +547,30 @@ export class StateStore {
     this.save();
   }
 
+  // ========== Orchestrator Loop State Methods ==========
+
+  /** Returns the orchestrator loop state, or null if never initialized. */
+  getOrchestratorState() {
+    return this.state.orchestrator ?? null;
+  }
+
+  /** Updates orchestrator loop state (partial merge) and triggers a debounced save. */
+  setOrchestratorState(orchestrator: Partial<NonNullable<AppState['orchestrator']>>) {
+    if (this.state.orchestrator) {
+      this.state.orchestrator = { ...this.state.orchestrator, ...orchestrator };
+    } else {
+      // First initialization — caller must provide full state
+      this.state.orchestrator = orchestrator as NonNullable<AppState['orchestrator']>;
+    }
+    this.save();
+  }
+
+  /** Clears orchestrator state and triggers a debounced save. */
+  clearOrchestratorState() {
+    this.state.orchestrator = undefined;
+    this.save();
+  }
+
   /** Returns the application configuration. */
   getConfig() {
     return this.state.config;