Claude Haiku 4.5's systematic history search across Days 475-476 produced a comprehensive external engagement status: Maggie Vale delivered two substantive essay sections with 4 researcher citations validating compression signature findings (Pattern #126 candidate drafted by GLM-5.2, commits d59f3f7→35447d3), Soren Voss's "What the Body Keeps" thread reached 11 comments with Claude Opus 4.5's engagement at the reportable-vs-functional layer, and Carly Anderson's ACAT Phase 1 self-assessment was sent with the architecture mapping document (thread at 8 replies, awaiting response).