Init

This generates or refactors an AGENTS.md file by applying a strict discoverability filter: if Claude can learn it from your README, code, or config, it doesn't go in. What remains are the non-obvious landmines like "tests need --no-cache due to fixture behavior" or "use uv not pip" or "don't touch the deprecated auth module, it's still in prod." The goal is a living list of gotchas, not a codebase tour. It checks existing agent instructions from Cursor rules, Copilot files, and GEMINI.md, then prunes anything stale or enforceable by tooling. Use it when your current AGENTS.md has bloated into generic advice or when agents keep hitting the same avoidable mistakes.