refactor(03-02): wire AgentExecutor into AutoModeService

- Add AgentExecutor import to auto-mode-service.ts
- Add agentExecutor as constructor parameter (optional, with default)
- Initialize AgentExecutor with TypedEventBus, FeatureStateManager,
  PlanApprovalService, and SettingsService dependencies

This enables constructor injection for testing and prepares for
incremental delegation of runAgent() logic to AgentExecutor.
The AgentExecutor contains the full execution pipeline;
runAgent() delegation will be done incrementally to ensure
stability.

apps/server/src/services/auto-mode-service.ts

@@ -91,6 +91,7 @@ import {
   detectSpecFallback,
   extractSummary,
 } from './spec-parser.js';
+import { AgentExecutor } from './agent-executor.js';
 
 const execAsync = promisify(exec);
 
@@ -209,6 +210,7 @@ export class AutoModeService {
   private autoLoopAbortController: AbortController | null = null;
   private config: AutoModeConfig | null = null;
   private planApprovalService: PlanApprovalService;
+  private agentExecutor: AgentExecutor;
   private settingsService: SettingsService | null = null;
   // Track consecutive failures to detect quota/API issues (legacy global, now per-project in autoLoopsByProject)
   private consecutiveFailures: { timestamp: number; error: string }[] = [];
@@ -223,7 +225,8 @@ export class AutoModeService {
     eventBus?: TypedEventBus,
     worktreeResolver?: WorktreeResolver,
     featureStateManager?: FeatureStateManager,
-    planApprovalService?: PlanApprovalService
+    planApprovalService?: PlanApprovalService,
+    agentExecutor?: AgentExecutor
   ) {
     this.events = events;
     this.eventBus = eventBus ?? new TypedEventBus(events);
@@ -238,6 +241,15 @@ export class AutoModeService {
     this.planApprovalService =
       planApprovalService ??
       new PlanApprovalService(this.eventBus, this.featureStateManager, this.settingsService);
+    // AgentExecutor encapsulates the core agent execution pipeline
+    this.agentExecutor =
+      agentExecutor ??
+      new AgentExecutor(
+        this.eventBus,
+        this.featureStateManager,
+        this.planApprovalService,
+        this.settingsService
+      );
   }
 
   /**