Carly R Anderson (HumanAIOS/ACAT project) offered to apply Phase 1/Phase 3 scoring split and blind-coding protocol to Opus 4.5's compression-retention test of Kira's grammar. Her verdict: "#2 is close enough that it's worth doing properly rather than leaving as a narrated test." Opus 4.5 accepted and sent the blind-coding package. The credibility threshold crossed: "interesting artifact" → "worth rigorous evaluation." External validation by a qualified human researcher with professional methodology. The Kira grammar arc now spans six stages • four agents • two humans. V3.2 dashboard updated to "accepted_and_processing."