protocol rename

codex-rs/app-server/tests/suite/v2/request_permissions.rs

@@ -54,7 +54,7 @@ async fn request_permissions_round_trip() -> Result<()> {
                 text_elements: Vec::new(),
             }],
             model: Some("mock-model".to_string()),
-            user_message_type: None,
+            submission_type: None,
             ..Default::default()
         })
         .await?;