SQL injection in user_service.py:88 — request-changes blocker
refuters are blind: neutral claim + raw diff slice only (engine §1)
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Set the gate, then Run refutation.
N same-model Claude refuters reduce variance, not bias — they share blind spots. This optional lane routes one quorum slot to a different model family (Codex/GPT). Flip the precondition gate to see a Claude slot swap to a cross-model slot (substitution, not addition), then run refutation.