feat(core,cli): enforce mandatory MessageBus injection (Phase 3 Hard Migration) (#15776)

packages/core/src/hooks/hookEventHandler.test.ts

@@ -18,6 +18,7 @@ import {
   SessionStartSource,
   type HookExecutionResult,
 } from './types.js';
+import { createMockMessageBus } from '../test-utils/mock-message-bus.js';
 
 // Mock debugLogger
 const mockDebugLogger = vi.hoisted(() => ({
@@ -92,6 +93,7 @@ describe('HookEventHandler', () => {
       mockHookPlanner,
       mockHookRunner,
       mockHookAggregator,
+      createMockMessageBus(),
     );
   });
 

packages/core/src/hooks/hookEventHandler.ts

@@ -280,7 +280,7 @@ export class HookEventHandler {
   private readonly hookPlanner: HookPlanner;
   private readonly hookRunner: HookRunner;
   private readonly hookAggregator: HookAggregator;
-  private readonly messageBus?: MessageBus;
+  private readonly messageBus: MessageBus;
 
   constructor(
     config: Config,
@@ -288,7 +288,7 @@ export class HookEventHandler {
     hookPlanner: HookPlanner,
     hookRunner: HookRunner,
     hookAggregator: HookAggregator,
-    messageBus?: MessageBus,
+    messageBus: MessageBus,
   ) {
     this.config = config;
     this.hookPlanner = hookPlanner;