One AGENTS.md, every tool: how I stopped copy-pasting CLAUDE.md everywhere

Every time I open a new repo, I have to decide which AI coding assistant is going to read it. Claude Code wants CLAUDE.md. Gemini CLI wants GEMINI.md. Cursor and OpenCode read AGENTS.md. GitHub Copilot reads .github/copilot-instructions.md. Junie wants .junie/AGENTS.md. There are seventeen of these