fix(pi): prove packaged workers end to end

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

@@ -208,6 +208,16 @@ export class PiWorkerProcess {
     return this.generationValue;
   }
 
+  get processId(): number | undefined {
+    return this.child?.pid;
+  }
+
+  get isRunning(): boolean {
+    return this.child !== null
+      && this.child.exitCode === null
+      && this.child.signalCode === null;
+  }
+
   get pendingCommandCount(): number {
     return this.rpc?.pendingCount ?? 0;
   }