feat(companion): add hasPendingWork runtime observability

src/companion/runtimeClient.ts

@@ -310,6 +310,10 @@ export class CompanionRuntimeClient {
     return this.pendingEventWaits.size;
   }
 
+  get hasPendingWork(): boolean {
+    return this.pendingRequestCount > 0 || this.pendingEventWaitCount > 0;
+  }
+
   async connect(): Promise<void> {
     if (this.connected) {
       return;