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(m-plus-b per task label); CANDIDATE=BASE+WRAPPER (wrapper = RC text with N prefix removed), both hashes verified against the brief before running. Simulator run serially in-process (workers=1, sandbox=False) per orderbook_pm_challenge.runner.sample_config/SimulationEngine API at commit b244530ee2a6247b5f930830eeca9dd950da0e7e. d = CANDIDATE.total_edge - BASE.total_edge per seed; retail_diff/arb_diff are mean per-seed differences of SimulationResult.retail_edge and .arb_edge. All 500 seeds in 706000-706499 completed with no exceptions."}