Resolve executor MCP stdio programs

Co-authored-by: Codex <noreply@openai.com>

Author: aibrahim-oai

codex-rs/rmcp-client/src/stdio_transport_runtime.rs

@@ -292,11 +292,12 @@ async fn create_executor_stdio_transport(
     } = params;
     let program_name = program.to_string_lossy().into_owned();
     let envs = create_env_for_mcp_server(env, &env_vars);
+    let resolved_program = program_resolver::resolve(program, &envs).map_err(io::Error::other)?;
     // The executor protocol carries argv/env as UTF-8 strings. Local stdio can
     // accept arbitrary OsString values because it calls the OS directly; remote
     // stdio must reject non-Unicode command, argument, or environment data
     // before sending an executor request.
-    let argv = executor_stdio_argv(&program, &args).map_err(io::Error::other)?;
+    let argv = executor_stdio_argv(&resolved_program, &args).map_err(io::Error::other)?;
     let env = executor_stdio_env(envs).map_err(io::Error::other)?;
     let process_id = next_process_id();
     // Start the MCP server process on the executor with raw pipes. `tty=false`