Write a CLAUDE.md that only says what Claude cannot find

/goal CLAUDE.md exists at the repo root, is under 120 lines, and lists the install, test, lint and build commands this repo really uses (read them from package.json, Makefile, pyproject.toml or the CI config, never guess). It also lists up to 5 gotchas you found while reading the code, such as required env vars or a service that must run first. To prove it: run every command listed in CLAUDE.md once and show each command with its exit code; any command that needs a missing service or secret is marked in CLAUDE.md as such instead of failing. Constraints: do not change any file except CLAUDE.md, no style rules a linter already enforces, no secrets or real env values. Or stop after 15 turns and show what is still unproven.