## New Skill

**Skill name**: `hig-`

### Description
What HIG topics does this skill cover?

### Checklist
- [ ] `name` matches directory name
- [ ] `name` starts with `hig-` prefix
- [ ] `version` field present (e.g., `1.0.0`)
- [ ] `description` is 1-1024 chars with trigger phrases
- [ ] `description` includes "when the user says" natural language triggers
- [ ] `description` cross-references related skills
- [ ] `SKILL.md` is under 500 lines
- [ ] `SKILL.md` includes all required sections:
  - [ ] Persona
  - [ ] Before Providing Guidance (project context check)
  - [ ] When to Use This Skill
  - [ ] Key Principles
  - [ ] Reference Index
  - [ ] Output Format
  - [ ] Task-Specific Questions
  - [ ] Related Skills
- [ ] Reference files are in `references/` directory
- [ ] All reference index links resolve to existing files
- [ ] VERSIONS.md updated with new skill entry
- [ ] README.md skill table updated
- [ ] marketplace.json skills list updated