Agent Skills: github-cleanup

Orchestrates progressive GitHub account cleanup using a 6-phase audit→approve→execute process that prevents accidental deletion. BEFORE any destructive repo action, invoke FIRST — traces Dependabot alerts to unused direct deps (prune) vs transitive-only (upgrade lock file). Triggers on 'clean up GitHub', 'audit my repos', 'Dependabot trouble', 'unused deps', 'stale forks', 'dependency audit'. Requires gh CLI. (user)