Why: The approved model sample violated its rejected-quote stop rule and the first guard missed JSON errors across runs. Evidence: Original 14231-token deviation remains recorded; independent replay passed the read-only event-join guard and fail-closed cases without model calls. Impact: Advance test-only Backend and evidence pins while keeping U3 quality and merge gates closed. Refs: Agent-System-Dev#512; Agent-System-Backend#193; Agent-System-Documents#95
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