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danrobinson/prediction-market-challenge at b244530ee2a6247b5f930830eeca9dd950da0e7e, unmodified, Python 3.12.3, serial in-process, no sandbox/workers. Per seed: cfg=runner.sample_config(ChallengeConfig(), ParameterVariance(), seed=s); SimulationEngine(cfg, loader.load_strategy_factory(path), seed=s).run() for T then CANDIDATE, factory reloaded per run. d = CANDIDATE.total_edge - T.total_edge. Both hashes verified. Seeds with nonzero d by spread: {\"1\": 0, \"2\": 0, \"3\": 0, \"4\": 0}. se = sample sd/sqrt(n). All 500 paired d are exactly 0.0 (bit-identical total_edge). Reason, from the code: ON['premium'] is read in only one place in T (line 409, inside `if self.s == 4:` in qask: `if 4 not in ON['premium'] and P['pL'] <= phat <= 0.95: b *= 1.4`), so adding 1 to premium cannot affect any spread; this flip is a structural no-op, not a measured null effect."}