- Implement full game logic, scoring, and UI scenes for Cribbage and Canasta
- Add heuristic AI opponents with 5 skill levels and reaction delays for both games
- Cribbage: race-to-121 track, pegging, crib scoring, and cut mechanics
- Canasta: 108-card shoe, partnership melding, canastas, frozen/blocked piles, and go-out rules
- Include headless verification scripts (fixture + self-play tests) for both games
- Register new games in server registry and update scene routing
- Add tutorial markdown files and update game icon assets
