fix: redesign game over screen with properly centered creepy ascii rat

tests/test_gameover.py

@@ -0,0 +1,40 @@
+import sys
+from pyboy import PyBoy
+import cv2
+import numpy as np
+
+def main():
+    pyboy = PyBoy('maze.gb', window='null')
+    # Run for 400 frames to let the game over screen render and boot sequence finish
+    for _ in range(400):
+        pyboy.tick()
+    
+    # Save screenshot
+    img_path = '/tmp/gameover_test.png'
+    pyboy.screen.image.save(img_path)
+    
+    # Draw grid with OpenCV
+    img = cv2.imread(img_path)
+    for x in range(0, 160, 8):
+        cv2.line(img, (x, 0), (x, 144), (0, 255, 0), 1)
+    for y in range(0, 144, 8):
+        cv2.line(img, (0, y), (160, y), (0, 255, 0), 1)
+    cv2.imwrite('/tmp/gameover_grid.png', img)
+    print("Saved grid image to /tmp/gameover_grid.png")
+
+    print("Screen tilemap:")
+    for y in range(18):
+        line = ""
+        for x in range(20):
+            tile_id = pyboy.memory[0x9800 + y * 32 + x]
+            # Default font mapping: Space is 0x20. ASCII maps directly!
+            if 0x20 <= tile_id <= 0x7E:
+                line += chr(tile_id)
+            else:
+                line += "."
+        print(f"{y:02d}: '{line}'")
+
+    pyboy.stop()
+
+if __name__ == '__main__':
+    main()