Ln 512 Tech Debt Cleaner

Automated janitor for low-risk tech debt. It reads audit reports from codebase analysis skills, filters for safe fixes like unused imports and dead code, verifies each change with 90%+ confidence using reference checks, then applies fixes bottom-up to avoid line number chaos. The smart part is the per-file keep/discard loop: it runs your linter and type checker after each file edit, keeps what passes, reverts what breaks. No architectural changes, no business logic touches, just mechanical cleanup that would take hours to do manually. Best used after a full codebase audit when you want the obvious stuff gone before tackling real problems. Commit messages show exactly what got removed and what got skipped.