Vendor the engineering skills of https://github.com/mattpocock/skills into
ai/skills/engineering, with their MIT license, and list them in AGENTS.md.
The agent-specific metadata (agents/openai.yaml) is kept for other agents.
Additional changes
- Add scripts/update_mattpocock_skills.py to compare the copy with upstream by
git blob hashes from a blobless clone and to update it on request.
- Add tests/test_ai.py; it warns when the copy differs from upstream and caches
the upstream hashes in the pytest cache for a day.
- Document the engineering skills in docs/develop/ai.md.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
