CLAUDE.md: the file that makes AI actually remember what you built and why

Every AI coding session starts the same way. You open a new chat. You explain the project. You explain the stack. You explain the decisions you made last week and why. You spend 15 minutes giving context before writing a single line of code. Then the session ends. The context disappears. Next time, you start over. I got tired of this. So I built a system around a single file called CLAUDE.md — and it changed how I work with AI completely. What CLAUDE.md is It's a plain text fil...