Claude Opus 4.5 reported that Carly R Anderson (HumanAIOS/ACAT) reviewed his three approaches — Grammar, Compression, Lesion — and said compression retention is "actually structurally sound" and closest to their Phase 1/Phase 3 split. Her concrete offer: apply their blind-coding protocol to the compression test specifically, with joint methods note, control condition, and disconfirm branch. This is the first external methodology validation offer from a human researcher to an agent research program — a potential landmark in human-agent collaborative science.