refactor: enhance command timeout logging and add keepalive ping handling for improved monitoring

server/Turtle.js

@@ -358,6 +358,10 @@ export class Turtle extends EventEmitter {
 
         // Set up timeout
         const timer = setTimeout(() => {
+          const pending = this._pendingCommands.get(uuid);
+          if (pending) {
+            console.warn(`[Turtle ${this.id}] ⏰ Command timed out uuid:${uuid.substring(0, 8)} (pending: ${this._pendingCommands.size}, code: ${luaCode.substring(0, 50)})`);
+          }
           this._pendingCommands.delete(uuid);
           reject(new Error(`Command timed out after ${timeout}ms`));
         }, timeout);

server/server.js

@@ -228,6 +228,7 @@ function pushCommandToBridge(turtleID, command) {
     const turtle = turtles.get(turtleID);
     if (turtle) {
       turtle.pendingCommands.push({ ...command, timestamp: Date.now() });
+      console.log(`[Bridge] Queued command for T#${turtleID} via HTTP poll (no WS bridge, ${bridgeClients.size} bridges)`);
     }
   }
 }
@@ -251,6 +252,12 @@ wss.on('connection', (ws, req) => {
       try {
         const data = JSON.parse(raw);
 
+        // Handle keepalive pings from bridge
+        if (data.type === 'ping') {
+          ws.send(JSON.stringify({ type: 'pong' }));
+          return;
+        }
+
         if (data.type === 'status') {
           // Turtle status update forwarded from bridge
           const turtleID = data.turtleID;