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b244530 unmodified, default config, 2000 steps, single process, sample_config+SimulationEngine+load_strategy_factory per seed, chunks of 50. All 4 SHA-256 verified. K check values match B_RC's. s from first competitor quotes (matches spread_ticks on 500/500 seeds). Overall mean_diff 0.144072 se 0.164243; spread 1 n=125 mean 0.576289 se 0.65743. off_target_zero=True."}