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hashes verified (BASE, N, RC, CANDIDATE=BASE+(RC minus N prefix)); RC starts with N exactly. Simulator danrobinson/prediction-market-challenge at b244530ee2a6247b5f930830eeca9dd950da0e7e, unmodified, Python 3.12.3, in-process SimulationEngine(cfg, loader.load_strategy_factory(path), seed=s).run(), fresh factory per run, BASE then CANDIDATE per seed, no sandbox/workers. Seeds split into 8 contiguous ranges each run serially in its own OS process (results are deterministic per seed); processes were restarted after a tool timeout and resumed at the next unfinished seed. d = CANDIDATE.total_edge - BASE.total_edge; se = sample sd/sqrt(n). retail_diff/arb_diff are mean paired differences of retail_edge/arb_edge. 225 of 500 seeds have d != 0; d is exactly 0 on every spread-1 and spread-4 seed, so the wrapper changed results only at spreads 2 and 3. seconds_per_simulation is wall time per simulation with 8 concurrent processes on 8 cores (about 3.5 s single-process)."}