5b43b3c8d5
Previously every frame: cleared+redrawed 868 cells for coins, cleared+ redrawed all UI text, emptied+recreated pause layer, and swapped key sprites repeatedly. Now uses dirty flags and cached values: - Coins: only redrawn when coins-dirty? is set (on coin eat/key pickup) - Maze: only redrawn when a door is removed - UI: only redrawn when score or time string actually changes - Key: sprite swap happens exactly once, not every frame - Pause: layer only modified when paused? state transitions Exposes mark-coins-dirty! and mark-maze-dirty! messages so the game ADT can signal changes from the level. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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