fix(coding): serialize agent server sleep restart

electron/api/coding-composition.ts

@@ -498,6 +498,7 @@ export function createCodingComposition(
       await Promise.allSettled(conversationIds.map((conversationId) => (
         runtime.dispose(conversationId, reason)
       )));
+      if (reason === 'background_sleep' && runtime.hasActiveWork()) return;
       await agentServer.stop();
     },
     async shutdown() {

electron/coding-runtime/pi/agent-server-process.ts

@@ -490,6 +490,7 @@ export class PiAgentServerProcess {
   }
 
   start(): Promise<void> {
+    if (this.stopFlight) return this.stopFlight.then(() => this.start());
     if (this.startFlight) return this.startFlight;
     if (this.child && !this.failure) return Promise.resolve();
     this.startFlight = this.startServer().finally(() => {