fix: test missing timeout_ms field, unused title warning

crates/common/src/protocol.rs

@@ -154,6 +154,7 @@ mod tests {
         let msg = ServerMessage::ExecRequest {
             request_id: Uuid::nil(),
             command: "echo hello".into(),
+            timeout_ms: None,
         };
         let json = serde_json::to_string(&msg).unwrap();
         assert!(json.contains("exec_request"));