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/tsconfig.json

@@ -0,0 +1,25 @@
+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "useDefineForClassFields": true,
+    "lib": ["ES2020", "DOM", "DOM.Iterable"],
+    "module": "ESNext",
+    "skipLibCheck": true,
+
+    /* Bundler mode */
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "noEmit": true,
+    "jsx": "react-jsx",
+
+    /* Linting */
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noFallthroughCasesInSwitch": true
+  },
+  "include": ["src"],
+  "references": [{ "path": "./tsconfig.node.json" }]
+}