fix(mcp): address SDK migration review

Co-Authored-By: OpenAI Codex (GPT-5) <noreply@openai.com>

operation/operation_test.go

@@ -2,6 +2,22 @@ package operation
 
 import "testing"
 
+func TestNewHTTPServerConfig(t *testing.T) {
+	server := newHTTPServer(":12345", newMCPServer("test"))
+	if server.Addr != ":12345" {
+		t.Errorf("Addr = %q, want %q", server.Addr, ":12345")
+	}
+	if server.Handler == nil {
+		t.Error("Handler is nil")
+	}
+	if server.ReadHeaderTimeout != httpReadHeaderTimeout {
+		t.Errorf("ReadHeaderTimeout = %v, want %v", server.ReadHeaderTimeout, httpReadHeaderTimeout)
+	}
+	if server.WriteTimeout != 0 {
+		t.Errorf("WriteTimeout = %v, want zero for SSE", server.WriteTimeout)
+	}
+}
+
 func TestParseAuthToken(t *testing.T) {
 	tests := []struct {
 		name      string