A tiny test-first loop you can run before every Claude Code patch: goal → failing test → smallest patch → verify.
5 refactor constraints that keep AI refactors safe, plus a “file lock” prompt snippet you can paste into Claude Code.
A repo onboarding worksheet (entry points, commands, danger zones) plus ready-to-paste rules for Claude Code.
A terminal-side checklist card plus a copy-paste prompt that forces a file list before code changes.