[koic]

This release brings the server's JSON-RPC framing and capability advertisement, and the HTTP client's handling of an initialize answered over SSE, in line with the MCP specification. Several answers change on the wire, as fixes of incorrect conformance under the exceptions described in VERSIONING.md: a request whose id is null is refused with -32600 instead of being run, and a request method sent without an id is not run; an error response whose request id cannot be read carries no id member instead of "id": null; a stateless Streamable HTTP server no longer advertises listChanged or subscribe in initialize, since it cannot deliver those notifications, so clients refresh their lists on their own there; and the HTTP client returns from initialize as soon as its result arrives and raises RequestHandlerError on a 4xx or 5xx answer with an SSE body instead of returning the error event. Senders of null ids and code that read such error events have to change; nothing else needs migration. A stdio server also survives a frame it cannot strip, parse or answer.

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed