docs(claude): add documentation standards reference

- Add docs/ folder location to quick references
- Reference socket-registry for full documentation standards

Author: jdalton

CLAUDE.md

@@ -20,6 +20,7 @@ All shared standards (git, testing, code style, cross-platform, CI) defined in s
 **Quick references**:
 - Commits: [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/) `<type>(<scope>): <description>` - NO AI attribution
 - Scripts: Prefer `pnpm run foo --flag` over `foo:bar` scripts
+- Docs: Use `docs/` folder, lowercase-with-hyphens.md filenames, pithy writing with visuals
 
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