Clean up proven-junk stray files that accumulate in a repo (Git-Bash heredoc-splitting artifacts, empty scratch dirs) once real work is safely committed, flag (never silently delete) regenerable build caches like target/ or node_modules/, and default every newly created repo to private. Use when the user mentions disk bloat, 'clean up old files', 'useless files', a messy `git status`, or when about to create a new GitHub/git repo.
