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MA minus frozen N; both UTF-8 code hashes verified before execution and after measurement. Unmodified simulator commit b244530ee2a6247b5f930830eeca9dd950da0e7e; default ChallengeConfig and ParameterVariance; 2000 steps. All 500 pairs ran serially in one Python process, in ten chunks of 50, without sandbox or workers; fresh strategy per simulation. Only assigned seeds and four prescribed comparator check seeds were simulated. Spread comes from initial rival quotes. Statistics use unrounded edges; per_seed and worst_seeds d rounded to 6 decimals. Retail and arb differences are paired means. Timing is mean wall seconds per measurement simulation, excluding checks, startup, and persistence. No tuning or promotion decision; this is one block of the finalist measurement."}