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)

examples/cursor-react-skill/example-project/package.json

@@ -0,0 +1,21 @@
+{
+  "name": "cursor-react-example",
+  "version": "1.0.0",
+  "description": "Example React project with Cursor AI rules",
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc && vite build",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "react": "^18.2.0",
+    "react-dom": "^18.2.0"
+  },
+  "devDependencies": {
+    "@types/react": "^18.2.0",
+    "@types/react-dom": "^18.2.0",
+    "@vitejs/plugin-react": "^4.0.0",
+    "typescript": "^5.0.0",
+    "vite": "^4.3.0"
+  }
+}