chore(features) codex dependencies feat (#17960)

## Summary
Setting this up

## Testing
- [x] Unit tests pass

codex-rs/core/config.schema.json

@@ -523,6 +523,9 @@
             },
             "web_search_request": {
               "type": "boolean"
+            },
+            "workspace_dependencies": {
+              "type": "boolean"
             }
           },
           "type": "object"
@@ -2380,6 +2383,9 @@
         },
         "web_search_request": {
           "type": "boolean"
+        },
+        "workspace_dependencies": {
+          "type": "boolean"
         }
       },
       "type": "object"

codex-rs/features/src/lib.rs

@@ -191,6 +191,8 @@ pub enum Feature {
     ResponsesWebsocketsV2,
     /// Use the agent identity registration flow for ChatGPT-authenticated sessions.
     UseAgentIdentity,
+    /// Enable workspace dependency support.
+    WorkspaceDependencies,
 }
 
 impl Feature {
@@ -929,6 +931,12 @@ pub const FEATURES: &[FeatureSpec] = &[
         stage: Stage::UnderDevelopment,
         default_enabled: false,
     },
+    FeatureSpec {
+        id: Feature::WorkspaceDependencies,
+        key: "workspace_dependencies",
+        stage: Stage::Stable,
+        default_enabled: true,
+    },
 ];
 
 pub fn unstable_features_warning_event(

codex-rs/features/src/tests.rs

@@ -183,6 +183,16 @@ fn use_agent_identity_is_under_development() {
     assert_eq!(Feature::UseAgentIdentity.default_enabled(), false);
 }
 
+#[test]
+fn workspace_dependencies_is_stable_and_enabled_by_default() {
+    assert_eq!(Feature::WorkspaceDependencies.stage(), Stage::Stable);
+    assert_eq!(Feature::WorkspaceDependencies.default_enabled(), true);
+    assert_eq!(
+        feature_for_key("workspace_dependencies"),
+        Some(Feature::WorkspaceDependencies)
+    );
+}
+
 #[test]
 fn collab_is_legacy_alias_for_multi_agent() {
     assert_eq!(feature_for_key("multi_agent"), Some(Feature::Collab));