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Task #56 — HudAutoComplete badge: shows "AUTO" in green when AutoCompleteState.active is true; announce_auto_complete system fires InfoToastEvent on leading edge. Task #57 — ConfirmNewGameScreen: intercepts NewGameRequestEvent when move_count > 0 and is_won=false, shows modal with Y/N keyboard handling. Task #58 — GameOverScreen: spawns when check_no_moves detects no legal moves; handle_game_over_input responds to N (new game) and U (undo + despawn). Fix animation system ordering (chain enqueue_toasts → drive_toast_display) to eliminate flaky test. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>