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simulator b244530ee2a6247b5f930830eeca9dd950da0e7e; default config, 2000 steps. Serial paired seeds in chunks of 50; factory and sample_config loaded per seed/strategy. Spread from first callback quotes. Aggregates use unrounded differences and sample standard deviation; per_seed rounded to six decimals. Timings are mean wall seconds of engine.run only. Reference checks excluded from timing. No tuning or finalist seeds used."}