Engine, felt, controls, sounds, card skins, and dev popups; SSE events in the realtime hook, nav and command palette entries, stats migration, and the six blackjack test suites.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
