- Add acquire_lock/release_lock to prevent daemon vs manual conflicts
- Check cmd_start/cmd_continue success before updating state to 'notified'
- Set state to 'error' if command fails
- Track actual session_id from session file after cmd_start completes
- Release lock when task completes (success or error)
- Use load_agent_env 'pm-agent' for GITEA_TOKEN
Fixes critical race conditions and failure handling in queue processing