MCP SDK Conversion

[cpjet64]

So I got fed up with codex not working natively on windows 11 without wsl and i put some time into fixing the PATH/PATHEX issues and at the same time wanted to improve the MCP capability so I did a full conversion to the official Rust MCP SDK for both the client and server implementations. Little did I know I did not read the note about not taking community input anymore for things other than bugs/security.

Does anyone on the codex team want to take a look at the work to see if you're interested or am I just going to keep running my own higher performance version of codex?