# Doc Review: Pre-existing Fixes

## Review Summary

All documentation and code comments are accurate.

## Checklist
- [x] `upgrade.sh` comments and error messages are clear
- [x] `_infer_state_from_artifacts` docstring unchanged (function has no docstring — relies on code clarity)
- [x] `cmd_validate_folder` error message for corrupted state is clear and actionable
- [x] No stale references to removed behavior (no || true, no `.git/hooks` assumption)
- [x] Tests are well-documented with descriptive names
- [x] IMPLEMENTATION.md accurately describes all changes