test(pi): hold packaged rpc confirmation past timeout

electron/coding-runtime/pi/worker-pool.ts

@@ -38,6 +38,7 @@ export interface PiConversationWorker {
   subscribeInvalidation(listener: (error: PiProcessError) => void): () => void;
   stop(reason: PiWorkerStopReason): Promise<PiWorkerStopResult>;
   injectFailureForProof?(failure: PiWorkerProofFailure): Promise<void>;
+  delayNextResponseForProof?(commandType: string, delayMs: number): void;
 }
 
 export interface PiWorkerSessionBinding {
@@ -677,6 +678,21 @@ export class PiWorkerPool {
     return true;
   }
 
+  delayNextTopLevelConfirmationForProof(
+    conversationId: string,
+    commandType: string,
+    delayMs: number,
+  ): void {
+    const record = this.workers.get(conversationId);
+    if (!record || record.state === 'crashed') {
+      throw new Error('Conversation worker is not available for proof response delay');
+    }
+    if (!record.worker.delayNextResponseForProof) {
+      throw new Error('Conversation worker does not support proof response delay');
+    }
+    record.worker.delayNextResponseForProof(commandType, delayMs);
+  }
+
   private async performShutdown(): Promise<void> {
     this.shuttingDown = true;
     this.shutdownController.abort();