Module cleanup 

Manual temp file cleanup command.

Responsibilities:

• Provide on-demand cleanup of ralph temporary files.
• Support dry-run mode for safe preview of cleanup actions.
• Support force mode for immediate cleanup regardless of age.

Not handled here:

• Automatic cleanup (see main.rs startup cleanup and fsutil cleanup triggers).
• Tutorial sandbox cleanup (–keep-sandbox is intentional persistence).

Invariants/assumptions:

• Cleanup is best-effort and logs warnings on individual file errors.
• Dry-run lists what would be deleted without making changes.

Functions

run

Run the cleanup command.