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

Apps/MystifyDemo/main/Source/Application.cpp

@@ -0,0 +1,36 @@
+#include "Application.h"
+#include "MystifyDemo.h"
+#include "PixelBuffer.h"
+#include "esp_log.h"
+
+#include <Tactility/kernel/Kernel.h>
+
+constexpr auto TAG = "Application";
+constexpr int MYSTIFY_FRAME_DELAY_MS = 50;  // ~20 FPS for smooth animation
+
+static bool isTouched(TouchDriver* touch) {
+    uint16_t x, y, strength;
+    uint8_t pointCount = 0;
+    return touch->getTouchedPoints(&x, &y, &strength, &pointCount, 1);
+}
+
+void runApplication(DisplayDriver* display, TouchDriver* touch) {
+    // Run the Mystify screensaver demo
+    MystifyDemo mystify;
+    if (!mystify.init(display)) {
+        ESP_LOGE(TAG, "Failed to initialize MystifyDemo");
+        return;
+    }
+
+    ESP_LOGI(TAG, "Starting Mystify demo - touch to exit");
+
+    do {
+        mystify.update();
+
+        // Frame rate limiter - ~20 FPS for smooth animation
+        tt::kernel::delayTicks(tt::kernel::millisToTicks(MYSTIFY_FRAME_DELAY_MS));
+    } while (!isTouched(touch));
+
+    ESP_LOGI(TAG, "Mystify demo ended");
+}
+