feat: add handcrafted 8x8 sprite art and VBlank bioluminescent animation for rotten apples

README.md

@@ -9,7 +9,7 @@
 - **Classic Gameplay with a Twist:**
   - Classic grid-based snake action wrapped on a 32×24 playfield with edge-wrapping.
   - **Normal Apples:** Boost length and score (+10), with flashing animation and pickup sounds.
-  - **Rotten Apples:** Shrink snake length by 1; shrinking below length 2 results in Game Over! Despawn after 80 ticks.
+  - **Rotten Apples:** Shrink snake length by 1; shrinking below length 2 results in Game Over! Rendered with custom 8x8 pixel art featuring bruised amber decaying skin, dark rot cavities, a withered twig stem, and festering green mold spores with 60 FPS bioluminescent respiration. Despawn after 80 ticks.
   - **Cursed Apples:** Invert steering controls (Up ↔ Down, Left ↔ Right) for 40 ticks, requiring quick reflexes and adapted steering. Despawn after 90 ticks if avoided, allowing new curses to spawn later.
 - **Dual-Screen Layout:**
   - **Top Screen:** Real-time scoreboard, status alerts (*"CONTROLS INVERTED!"*), pause overlay, and optional debug stats.