chore(features) codex dependencies feat (#17960)

## Summary
Setting this up

## Testing
- [x] Unit tests pass

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));