Update to new agent schema (#35578)

Release Notes:

- N/A

---------

Co-authored-by: Agus Zubiaga <agus@zed.dev>

crates/agent_servers/src/agent_servers.rs

@@ -1,14 +1,12 @@
+mod acp;
 mod claude;
-mod codex;
 mod gemini;
-mod mcp_server;
 mod settings;
 
 #[cfg(test)]
 mod e2e_tests;
 
 pub use claude::*;
-pub use codex::*;
 pub use gemini::*;
 pub use settings::*;
 
@@ -38,7 +36,6 @@ pub trait AgentServer: Send {
 
     fn connect(
         &self,
-        // these will go away when old_acp is fully removed
         root_dir: &Path,
         project: &Entity<Project>,
         cx: &mut App,