Keep image_detail_original as a removed feature flag (#17803)

codex-rs/features/src/lib.rs

@@ -178,6 +178,9 @@ pub enum Feature {
     RealtimeConversation,
     /// Connect app-server to the ChatGPT remote control service.
     RemoteControl,
+    /// Removed compatibility flag retained as a no-op so old wrappers can
+    /// still pass `--enable image_detail_original`.
+    ImageDetailOriginal,
     /// Removed compatibility flag. The TUI now always uses the app-server implementation.
     TuiAppServer,
     /// Prevent idle system sleep while a turn is actively running.
@@ -874,6 +877,12 @@ pub const FEATURES: &[FeatureSpec] = &[
         stage: Stage::UnderDevelopment,
         default_enabled: false,
     },
+    FeatureSpec {
+        id: Feature::ImageDetailOriginal,
+        key: "image_detail_original",
+        stage: Stage::Removed,
+        default_enabled: false,
+    },
     FeatureSpec {
         id: Feature::TuiAppServer,
         key: "tui_app_server",