Refactor `SKILL.md` to adhere to claude-code skills docs and
eliminate content duplication with the supporting file.
Deats,
- fix `allowed-tools` from YAML list to comma-separated string
per frontmatter spec.
* https://code.claude.com/docs/en/skills#frontmatter-reference
- drop ~220 lines of inlined style-guide content that duplicated
`style-guide-reference.md`; replace with compact "Quick
Reference" section + markdown link to the full guide.
- fix supporting file ref from backtick-code to proper markdown
link syntax: `[style-guide-reference.md](./...)`.
- inline the file-writing instructions (timestamp + hash filename
format) directly, replacing the now-broken `CLAUDE.md` ref.
Also,
- add missing "commit msg" footer variant to
`style-guide-reference.md` (previously only showed "patch").
- move `.claude/CLAUDE.md` -> `style-guide-reference.md` as
proper skill supporting file.
(this patch was generated in some part by [`claude-code`][claude-code-gh])
[claude-code-gh]: https://github.com/anthropics/claude-code
Gud Boi