mcp 07-2026 conformance harness tracker

[filintod]

adding conformance tests to track gaps for modern mcp implementation. It includes a v2 version of everything server as currently everything server is still on previous/current version

stacked on top of #2417 (that closes some gaps for stateless)

pdf print of status.html:

agentgateway MCP conformance 07:07.pdf

---

Current gaps are related to MRTR. Pending safely removing unstrip in our code strip_unsupported_client_capabilities to handle capabilities. from the code:

// Until server-to-client request routing is implemented, do not advertise
// capabilities that require the proxy to route upstream requests back to
// the downstream client and route the client's JSON-RPC response upstream.