## Summary
- Swap prettier for oxfmt in devDependencies for faster formatting
- Rename scripts: prettier -> fmt, prettier:check -> fmt:check
- Update lint-staged to use oxfmt
- Update CLAUDE.md and skill docs to reference npm run fmt

## Test plan
- [x] Run npm run fmt to verify formatting works
- [x] Run npm run fmt:check to verify check mode works
- [x] Verify lint-staged runs oxfmt on commit

#skip-bugbot

<!-- This is an auto-generated description by cubic. -->
---
## Summary by cubic
Replaced Prettier with oxfmt for faster formatting. Updated to oxfmt
0.26.0, added a project config, renamed scripts to fmt and fmt:check,
and refreshed docs; oxfmt’s new rules applied compact formatting across
many files.

- **Migration**
  - Use npm run fmt and npm run fmt:check in local workflows and CI.
  - lint-staged now formats with oxfmt on commit.
  - Requires Node 20.19+ or 22.12+.

<sup>Written for commit a9e3812b02849f8d6357913113fca68ca8b4fcbc.
Summary will update on new commits.</sup>

<!-- End of auto-generated description by cubic. -->

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Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>