AGENTS.md had no Setup, Testing, or Commit/PR sections even though the
repo has verifiable, non-obvious conventions for all three: pre-commit
hooks span three stages with no default_install_hook_types set (a plain
`pre-commit install` silently skips commit-msg/pre-push), tests/run-tests.sh
runs the full suite, and conventional-pre-commit enforces Conventional
Commits. Agents working in this repo had no way to discover these without
reading the pre-commit config and scripts directly.
