Forward the JSON-RPC request id through the dispatcher and handler so methods can access the id. JsonRpc2Dispatcher now passes the id to dispatchMethodAsync, and the JsonRpc2 endpoint lambda accepts the id parameter. Implemented a call for "tools/call" that extracts the tool name via ser.ExtractFrom(id, "params", "name") and invokes a new ResolveToolsCall(string) stub (TODO: implement actual tool logic). This prepares the codepath for tooling invocation based on request params.
Introduce JSON-RPC 2.0 handling and a minimal stdio framing server. Adds ApiEndpoints/JsonRpc2 and JsonRpc2Dispatcher to parse and dispatch JSON-RPC requests, and StdioServer to handle Content-Length framed stdio messages. Adds McpToolsList.json (tools list resource) and wires JsonRpc2 into ResourceServer.
Program.cs: add --stdio-jsonrpc2 mode to run the stdio server, and integrate dispatcher usage (with timeout and TODO placeholders for tools/call). ResourceServer: register JsonRpc2 endpoint, change fallback handling to 404 via ServeResource(), and make several resource helper methods static/public for reuse. Update csproj to include new source files and embed the McpToolsList.json resource.
Contains basic implementation and scaffolding; tool-call handling is left as TODO.
