A2A Protocol이 1.0이 되면서 바뀐 것들, 그리고 0.3 구현체를 옮기려면

A2A Protocol v1.0 introduces fundamental architectural changes including multi-protocol bindings (gRPC/HTTP/JSON-RPC), new AgentCard specifications, and restructured message formats that break compatibility with v0.3. This comprehensive redesign requires careful migration planning for existing implementations, which the post facilitates with a detailed 6-step checklist. Early adoption of these changes while the SDK is still in development enables teams to upgrade smoothly upon official release.