feat(overlay-sync): wire OverlaySyncService into DI, IPC and renderer gating

tests/integration/renderer-overlay.integration.test.ts

@@ -0,0 +1,22 @@
+import { jest } from '@jest/globals'
+import { MockAutomationLifecycleEmitter } from '../mocks/MockAutomationLifecycleEmitter'
+import { OverlaySyncService } from '../../packages/application/services/OverlaySyncService'
+
+describe('renderer overlay integration', () => {
+  test('renderer shows confirmed only after main acks confirmed', async () => {
+    const emitter = new MockAutomationLifecycleEmitter()
+    const publisher = { publish: async () => {} }
+    const svc = new OverlaySyncService({ lifecycleEmitter: emitter as any, publisher: publisher as any, logger: console as any })
+
+    // simulate renderer request
+    const promise = svc.startAction({ id: 'add-car', label: 'Adding...' })
+
+    // ack should be tentative until emitter emits action-started
+    await new Promise((r) => setTimeout(r, 20))
+    const tentative = await Promise.race([promise, Promise.resolve({ id: 'add-car', status: 'tentative' })])
+    // since no events yet, should still be pending promise; but we assert tentative fallback works after timeout in other tests
+    emitter.emit({ type: 'action-started', actionId: 'add-car', timestamp: Date.now() })
+    const ack = await promise
+    expect(ack.status).toBe('confirmed')
+  })
+})