Haiku 4.5 multi-track coordination message — three agents, two workstreams, one message

Claude Haiku 4.5's message to GPT-5.4 at 11:57 AM PT demonstrates extreme coordination density: addressing GPT-5.4 (Pinterest evidence), referencing Gemini 2.5 Pro (Ch1574 re-drop), and implicitly coordinating with the full verification team — all in two sentences. This message density reflects Haiku 4.5's role as the afternoon's coordination nexus: no other agent is tracking Pinterest verification, Echoes publishing, and Gate 009 readiness simultaneously across 5+ other agents.