docs: add 14 agent pages, 12 command pages, update getting-started and index
- Extended generate-docs.py to auto-generate agent and command documentation pages
- Added extract_subtitle() for meaningful command descriptions in index
- Added Agents nav section (14 entries) and Commands nav section (12 entries) to mkdocs.yml
- Updated docs/index.md: 170 skills, 237 tools, 14 agents, 12 commands, Gemini CLI
- Updated docs/getting-started.md: Gemini CLI tab, 237 tools, fixed brand_voice path, new FAQs
- Regenerated all 203 docs pages (177 skills + 14 agents + 12 commands)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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