Istio 1.31 Adds Agentgateway Waypoints and Moves Release Artifacts off Google Cloud

If your clusters still pull Istio from gcr.io/istio-release or registry.istio.io, you have a calendar problem. Those are going away as the project moves off Google Cloud to AWS, with a December 2026 deadline and a deliberate “scream test” on October 13, 15:00-18:00 UTC. Images live on Docker Hub now. Also in 1.31: an istio-agentgateway-waypoint GatewayClass that proxies Model Context Protocol, not just HTTP.