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Cover four previously untested rule branches: - Moving a face-down card in a multi-card lift → RuleViolation - Moving two cards to foundation → RuleViolation - Requesting more cards than the pile holds → RuleViolation - Valid 3-card sequence tableau→tableau → succeeds and updates move_count Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>