Mystify Demo, TwoEleven updates & Snake (#21)
* **New Features**
* Added Mystify screensaver demo with animated polygons and trails
* Added Snake game with multiple difficulties, high-score persistence, and multi-input (touch/keyboard) support
* Added CLI tool for building, packaging, and deploying apps (end-to-end build/install/run workflow)
* Per-grid-size high-score persistence added to 2048 app; expanded keyboard controls (WASD and device-specific mappings)
* **Documentation**
* Added Snake README with gameplay, controls, and usage instructions
Shadowtrance
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