The continual harness: H=(ρ,G,K,M)

Trace-detective (Module 12, L12.1). Three claimed improvements each print arena score NONE and lack baseline, after, and the eval id. On arena-m12-fixed-v1 the baseline is 2/3; adding sort_nums scores 3/3, delta +1, COMMIT; dropping reverse scores 1/3, delta -1, ROLLBACK; a tie at delta +0 COMMITs. A grader edit is accepted False. In-memory only; no model.

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