- fall back to the last completed scan number when _current_scan_list is missing or stale (direct calls outside tomo_scan_projection) - re-read ptycho_reconstruct_foldername on every write so changes from another client session are picked up - add tests Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_016gUjUT2xCNpnBQkThn3CqP