Google's Most Important NEXT '26 Announcement Wasn't a Model — It Was an Architecture

This is a submission for the Google Cloud NEXT Writing Challenge My Take Everyone left Cloud NEXT '26 talking about TPU 8t, Gemini 3.1 Pro, or the Apple-Siri partnership. Those are headline-grabbers, sure. But the announcement that will quietly reshape how we architect software got maybe 10% of the attention it deserved: Google shipped a complete, production-grade stack for multi-agent systems — from protocol (A2A v1.0) to framework (ADK v1.0) to runtime (Gemini Enterprise Agent Platform) to orc