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hashes verified (BASE, N, RC, CANDIDATE); RC starts with N exactly; CANDIDATE = BASE + (RC minus N prefix). Simulator b244530 unmodified, Python 3.12.3, serial in-process, no sandbox/workers. Run in two serial invocations (703000-703418, 703419-703499) due to a 10-minute command limit; each seed is independent. No seed failed. d = CANDIDATE.total_edge - BASE.total_edge; retail_diff/arb_diff are mean per-seed differences of retail_edge/arb_edge. sum_d/sum_d2 rounded to 6 dp. At spreads 1 and 4 the wrapper never changed the result (d=0 on every seed)."}