Generate OG image with actual game board state
- Install tenuki library for Go board logic
- Fetch moves from PDS and replay them using tenuki
- Render actual stone positions on the SVG board
- Add radial gradients for realistic stone appearance
- Show last move indicator (circle marker)
- Support star points (hoshi) for all board sizes
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>