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

tests/mocks/MockAutomationLifecycleEmitter.ts

@@ -0,0 +1,21 @@
+export class MockAutomationLifecycleEmitter {
+  private callbacks: Set<(event: any) => Promise<void> | void> = new Set()
+
+  onLifecycle(cb: (event: any) => Promise<void> | void): void {
+    this.callbacks.add(cb)
+  }
+
+  offLifecycle(cb: (event: any) => Promise<void> | void): void {
+    this.callbacks.delete(cb)
+  }
+
+  async emit(event: any): Promise<void> {
+    for (const cb of Array.from(this.callbacks)) {
+      try {
+        await cb(event)
+      } catch {
+        // ignore subscriber errors in tests
+      }
+    }
+  }
+}