Fixed all six power-up behaviours this session. Speed boost and double points were already working. The main rework was on shield, freeze, and slow.

Shield now stays active until a ghost physically touches the player, when that happens, the ghost turns scared/blue instead of the player dying, and the shield remains active for future hits on a 15-second timer. Freeze keeps ghosts in their normal colour but completely stops their movement for 3 seconds - they’re still killable while frozen. Slow keeps ghosts at their normal appearance but skips movement every other frame, effectively halving their speed for 5 seconds.

Also implemented proper ghost spawn behavior. Ghosts now spawn at the center of the maze (on or near the ghost house tiles) and release one by one first ghost after 2 seconds, then one every 3 seconds. While waiting to release they bob up and down inside the house. After death, the release sequence resets so ghosts trickle out again rather than all rushing at once.

Pac-Man now spawns at a random open tile at least a third of the maze width away from the centre, so every life and every game starts from a different position.

Maze connectivity fix was attempted this session but not completed - some maps still have corridors that can trap the player. Carrying this into the next session