resign

/resign

1. Call mcp__sideboard__resign.
2. If the response contains error: "No active game.", tell the user there's no active game. Stop.
3. Otherwise, render:

```
{board_render}
```

Then on subsequent lines:

• **Chesster:** _{chesster_msg}_
• A blank line.
• **Game saved.** {stats summary as W:N L:N D:N}
• The PGN inside a fenced block, no language tag.