feat: add finite lifetimes and despawn mechanics for rotten and cursed apples

README.md

@@ -9,8 +9,8 @@
 - **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!
-  - **Cursed Apples:** Invert steering controls (Up ↔ Down, Left ↔ Right) for 40 ticks, requiring quick reflexes and adapted steering.
+  - **Rotten Apples:** Shrink snake length by 1; shrinking below length 2 results in Game Over! Despawn after 80 ticks with a flashing warning animation.
+  - **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.
   - **Bottom Screen:** Smooth 2D hardware sprite rendering using DS Sub-engine OAM.