Create searchable public documentation for Cursor users:
- cursor/index.mdx: Landing page with installation paths and quick reference
- cursor/gemini-setup.mdx: Step-by-step Gemini free tier setup guide
- cursor/openrouter-setup.mdx: OpenRouter setup with model recommendations
Add Cursor Integration navigation group to docs.json.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>