- fix KeyError in compute_coverage (generate_readme, generate_site)
- fix comma-separated MD5 handling in generate_pack check_inside_zip
- fix _verify_file_hash to handle multi-MD5 for large files
- fix external downloads not tracked in seen_destinations/file_status
- fix tar path traversal in _is_safe_tar_member (refresh_data_dirs)
- fix predictable tmp path in download.py
- fix _sanitize_path to filter "." components
- remove blanket data_dir suppression in find_undeclared_files
- remove blanket data_dir suppression in cross_reference
- add status_counts to verify_platform return value
- add md5_composite cache for repeated ZIP hashing