Preserve curated Memory notes on re-upload
Re-uploading a file keeps the work you already did to organize the note.
Improvements
- Keep titles, source attribution, tags, links, and capture dates on re-upload.
Fixes
- Reject a concurrent overwrite when a newer edit already exists.
- Keep local artifact paths out of Library captures. Deliberately captured short source text is still supported.
- Resolve automatic note links only to existing notes in the allowed vault.