The CLAUDE.md Setup — Give Your Project a Persistent Memory

A five-section template for writing a project's CLAUDE.md file so Claude Code (and Cursor via .cursorrules) knows your stack, conventions, landmines, and definition of done on every new session. Replaces the 15-minute re-briefing you keep doing at the start of every chat — one-time setup that compounds every session afterward and scales across teammates if you share the repo.