{"key":"ma-fresh-1","idea":"Measure-only: MA (C) vs B_RC (K) on fresh seeds 920000..920499, paired, per competitor spread; spread-1 difference is 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sim b244530, default config, 2000 steps, single process, sample_config+SimulationEngine+load_strategy_factory per seed, chunks of 50. All 4 SHA-256 checks passed; K check values match B_RC. s from initial competitor quotes equals config spread_ticks on 500/500 seeds. Winner per spread = sign of mean_diff; with n~125 per spread only |mean|>2se is meaningful (t_by_spread). Spread 4: d==0 exactly on all seeds (identical code path). off_target_zero=false per brief. Spread 1 favours MA (t=1.94, under 2se); 2 and 3 favour B_RC (t~-4). No tuning, no code changes."}