Equipment test: a kind holds every layer, as on main

Co-Authored-By: Claude Opus 5.5 <[email protected]>

crates/horizon-client/src/game/entity_model_loading_tests.rs

@@ -248,7 +248,7 @@ fn content_mods_equipment_loads_under_its_namespace() {
     let assets = ArmorStandAssets::load(&root.0, None);
     assert_eq!(
         assets.equipment["gems:ruby"]["humanoid_leggings"],
-        ("gems:entity/equipment/humanoid_leggings/ruby".into(), None)
+        vec![("gems:entity/equipment/humanoid_leggings/ruby".into(), None)]
     );
 }