Leavers now flip a left flag on the very next snapshot, the felt announces who left, and a game left with a single seated player resolves at once with a bell notification instead of waiting out the hand timer.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
