feat: add automated Vercel AI registry sync with OpenAI

Add hourly GitHub Action that syncs tools from Vercel's AI SDK registry:

Features:
- Fetches Vercel AI registry from their GitHub
- Uses OpenAI GPT-4 to intelligently convert tool metadata
- Handles multi-export packages (multiple tools per npm package)
- Automatically commits new tools to manual-tools.ts
- Sends Discord notifications with detailed stats
- Extensive logging at every step

Files added:
- sync-vercel-registry.ts - Main sync script with AI conversion
- .github/workflows/sync-vercel-registry.yml - Hourly GitHub Action
- docs/vercel-registry-sync.md - Complete documentation

Requires OPENAI_API_KEY secret in GitHub repository settings.

package.json

@@ -34,6 +34,7 @@
     "dependency-cruiser": "^17.3.1",
     "knip": "^5.70.2",
     "lefthook": "^1.10.1",
+    "openai": "^6.9.1",
     "tsx": "^4.21.0",
     "turbo": "^2.6.1",
     "type-coverage": "^2.29.7",