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500 seeds ran once per strategy, 1000 simulations, no failures. CPython 3.11.11 standalone on aarch64 (host had no Python); simulator tree unmodified at b244530. d is exactly 0 for every seed at spreads 1, 2, 4 (candidate code is guarded to s==3), so overall d comes only from 127 spread-3 seeds. Frozen code, measurement only; no promotion decision is made here."}