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Adds HudPlugin with a persistent top-left overlay that shows score, move count, and elapsed time during every game. A mode badge highlights DAILY, CHALLENGE, ZEN, or TIME ATTACK when the game is not in Classic mode. HUD updates whenever GameStateResource changes (moves and per-second time ticks) without a separate polling system. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>