fix(pi): keep active runs alive during background sleep

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

@@ -635,21 +635,27 @@ export class PiWorkerPool {
     return this.publicState(await record.rebuildFlight);
   }
 
-  async dispose(conversationId: string): Promise<void> {
+  async dispose(
+    conversationId: string,
+    reason: PiWorkerStopReason,
+    canStop: () => boolean = () => true,
+  ): Promise<boolean> {
     const pendingPrepare = this.prepareFlights.get(conversationId);
     if (pendingPrepare) await pendingPrepare.catch(() => undefined);
     let record = this.workers.get(conversationId);
-    if (!record) return;
+    if (!record) return false;
     if (record.rebuildFlight) {
       record = await record.rebuildFlight.catch(() => record as WorkerRecord);
     }
+    if (!canStop()) return false;
     this.cancelConversationRuns(conversationId, new Error('Conversation worker was disposed'));
     record.unsubscribeEvent();
     record.unsubscribeInvalidation();
     this.cancelGenerationResources(record);
     this.revisions.removeWorker(record.revisionWorkerId);
     if (this.workers.get(conversationId) === record) this.workers.delete(conversationId);
-    await this.ensureStoppedAndReleased(record, 'dispose');
+    await this.ensureStoppedAndReleased(record, reason);
+    return true;
   }
 
   private async performShutdown(): Promise<void> {