feat: Add Cursor React example repo (Task 3.2)

Complete working example demonstrating Cursor + Skill Seekers workflow:

**Main Example (examples/cursor-react-skill/):**
- README.md (400+ lines) - Comprehensive guide with expected outputs
- generate_cursorrules.py - Automation script for complete workflow
- .cursorrules.example - Sample generated rules (React 18+ patterns)
- requirements.txt - Python dependencies

**Example Project (example-project/):**
- package.json - React 18 + TypeScript + Vite
- tsconfig.json - Strict TypeScript configuration
- src/App.tsx - Sample counter component
- src/index.tsx - React entry point
- README.md - Testing instructions

**Workflow Demonstrated:**
1. Scrape React docs → skill-seekers scrape
2. Package for Cursor → skill-seekers package --target claude
3. Extract and copy → unzip + cp to .cursorrules
4. Test in Cursor IDE with AI prompts

**Example Prompts Included:**
- useState hook patterns
- Data fetching with useEffect
- Custom hooks for validation
- TypeScript typing examples

Shows before/after comparison of AI suggestions with and without .cursorrules.

Updates: README.md + INTEGRATIONS.md (added Haystack to supported list)

docs/integrations/INTEGRATIONS.md

@@ -30,7 +30,7 @@ Transform documentation into RAG-ready formats for AI-powered search and retriev
 |-----------|-------|--------|----------|-------|
 | **[LangChain](LANGCHAIN.md)** | 500K+ | Document | Python RAG, most popular | [Setup →](LANGCHAIN.md) |
 | **[LlamaIndex](LLAMA_INDEX.md)** | 200K+ | TextNode | Q&A focus, query engine | [Setup →](LLAMA_INDEX.md) |
-| **[Haystack](HAYSTACK.md)** | 50K+ | Document | Enterprise, multi-language | *Coming in v2.11.0* |
+| **[Haystack](HAYSTACK.md)** | 50K+ | Document | Enterprise, multi-language | [Setup →](HAYSTACK.md) |
 
 **Quick Example:**
 ```bash