The test called handle.join() without first calling handle.close(), causing the spawned session task to park forever waiting for cmd_rx.recv() to return None. Since join() borrows &self, cmd_tx stays alive, and the task never exits. Add close() call before join() to send a Close command and unblock the task. Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>