- Add is_file, is_dir, is_git functions for type validation
- Add is_compress function to detect compressed file extensions
- Implement pure Go wget with parallel segmented downloads (>1MB files)
- Add git_clone_subfolder with ZIP fallback for GitHub repos
- Add helper utilities: ZIP extraction, directory/file copying
- Add SkipWorkspace option to skip output dirs in empty-target mode
- Fix workflow preference loading order for --module-url flag
- Add 20+ comprehensive tests for all new functions