Write AGENTS.md

Give coding agents the facts they cannot infer from the tree: commands that work, conventions that differ from defaults, and boundaries with the alternative to use. Find existing files first, ignoring .gitignore:

fd -HI -E node_modules -E .git \
  '^(AGENTS|CLAUDE|CLAUDE\.local)\.md$|^AGENTS\.override\.md$'

Also check .claude/rules/, and edit what you find in place.

Rules