fix: add WebSocket ping keepalive in worker (30s interval)

src/worker_runner.rs

@@ -102,6 +102,19 @@ async fn connect_and_run(server_url: &str, worker_name: &str, llm_config: &crate
     let svc_mgr = ServiceManager::new(9100);
     let ws_tx = Arc::new(tokio::sync::Mutex::new(ws_tx));
 
+    // Ping task to keep connection alive
+    let ping_tx = ws_tx.clone();
+    tokio::spawn(async move {
+        let mut interval = tokio::time::interval(std::time::Duration::from_secs(30));
+        loop {
+            interval.tick().await;
+            let mut tx = ping_tx.lock().await;
+            if tx.send(Message::Ping(vec![].into())).await.is_err() {
+                break;
+            }
+        }
+    });
+
     // Channel for forwarding comments to the running workflow
     let comment_tx: Arc<tokio::sync::Mutex<Option<mpsc::Sender<AgentEvent>>>> =
         Arc::new(tokio::sync::Mutex::new(None));
@@ -111,6 +124,7 @@ async fn connect_and_run(server_url: &str, worker_name: &str, llm_config: &crate
         let text = match msg? {
             Message::Text(t) => t,
             Message::Close(_) => break,
+            Message::Pong(_) => continue,
             _ => continue,
         };