Refactor SKILL.md from 282 to 102 lines by removing duplicated
reference content (Core Guidelines, Quick Reference, Review Checklist,
Philosophy) and replacing it with an imperative operating guide:
Operating Rules, Task Workflow with shared Topic Router, and a compact
correctness-only checklist.
Migrate the "only adopt Liquid Glass when explicitly requested"
guardrail into references/liquid-glass.md so it is preserved in the
reference file.
Add agents/openai.yaml for Codex/OpenAI-compatible tooling and a
corresponding install option in the README.
Antoine van der Lee