New skills/index.md with full MkDocs Material capabilities:
- Hero section with gradient title and stats grid
- Mermaid architecture diagram showing skill package pattern
- 9 domain cards with skill counts and browse buttons
- Tabbed skills-by-category with expandable tables (173 skills)
- Pie chart showing Python tools distribution across domains
- 4-step "How Skills Work" explainer
- Multi-platform Quick Install tabs
- for-the-badge style shields.io badges in README.md
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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