- Extract git_cmd and git_cmd_list for reusable git command execution
- Add yank helper for consistent clipboard copying with notifications
- Enhance get_git_info to include abs_path and file_dir
- Add get_blame_info to retrieve detailed blame information with file hash
- Implement copy_commit_url for copying direct commit URLs
- Convert keymaps to use function references
New: <Leader>gC copies GitHub commit URL with file hash fragment