/ask frequently returns no result

### Describe the bug

Running the /ask command often fails to return any response. The command appears to execute but no output/result is produced, with no error message shonw.

### Affected version

1.0.75

### Steps to reproduce the behavior

1. Start a Copilot CLI session
2. Run /ask
3. Observe: no result is returned (not always)

### Expected behavior

/ask should reliably return an answer to the given question.

### Additional context

_No response_

Start a Copilot CLI session and repeatedly run the /ask command using the reported version, 1.0.75, to reproduce the intermittent missing response. Trace the /ask command's response handling and capture cases where it completes without output or an error. Done means /ask reliably returns an answer for the question, with a regression test covering the no-result case.

Written by the indexing model from the issue text.