## Summary

Brief description of what this PR does.

## Type of Change

- [ ] New agent
- [ ] New skill
- [ ] New hook or rule
- [ ] Bug fix
- [ ] Documentation improvement
- [ ] Other:

## Changes

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## Checklist

- [ ] I've tested this in a Claude Code session
- [ ] New agents include the Collaboration Protocol section
- [ ] New skills use the subdirectory format (`.claude/skills/<name>/SKILL.md`)
- [ ] Reference docs are updated (agent-roster, skills-reference, hooks-reference, rules-reference)
- [ ] Hooks use `grep -E` (POSIX) and fail gracefully without jq/python
- [ ] No hardcoded paths or platform-specific assumptions
