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DrawMode is a fieldless two-variant enum — it is trivially bitwise- copyable. Adding Copy + updating choose_winnable_seed to take the value directly eliminates 13 superfluous .clone() calls across solitaire_core, solitaire_engine, solitaire_assetgen, and solitaire_wasm. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>