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simulator b244530ee2a6247b5f930830eeca9dd950da0e7e, unmodified; default config, 2000 steps, serial in-process. All supplied hashes verified before simulation; four K checks match to six decimals. No tuning or strategy edits. Each seed loads both factories anew; first callback quotes determine spread via an observing wrapper. Statistics use unrounded edges and sample standard deviation; retail_diff and arb_diff are paired means. Timings cover engine.run only, excluding factory loading. No missing or failed runs."}