1. List open comment threads with `diffity agent list --status open --json`.
2. Filter threads based on `thread-id` if provided.
3. Skip general comments and threads awaiting user input.
4. For each actionable thread, interpret the requested change.
5. Make the code change using the Edit tool.
6. Resolve the thread with `diffity agent resolve <thread-id> --summary "Fixed: <description>"`.
7. Confirm status with `diffity agent list` and notify the user.