- Add bulk_delete_books.md for POST /api/books/bulk-delete
- Add bulk_update_books.md for POST /api/books/bulk-update
- Includes tag/contributor normalization details
- Documents dual-field normalization behavior
- Add download_book.md for GET /api/books/:uuid/download
- Public endpoint with auth for non-public libraries
- Documents Content-Type headers for different formats
Completes books operations API section