fix: Math/JSON/全局对象原型链挂 Object.prototype

crates/oxide_kernel/tests/builtin_world_tests.rs

@@ -69,6 +69,21 @@ fn test_protos_have_null_proto() {
     assert!(w.symbol_proto.proto().is_object());
 }
 
+#[test]
+fn test_math_json_proto_links_to_object_proto() {
+    let w = make_world();
+    let obj_proto_ptr = w.object_proto.as_ptr() as *mut JsObject;
+    // Math/JSON 命名空间对象的 proto 槽应指向 Object.prototype 本体。
+    assert!(
+        std::ptr::eq(w.math_object.proto().as_js_object_ptr(), obj_proto_ptr),
+        "Math namespace object should inherit Object.prototype"
+    );
+    assert!(
+        std::ptr::eq(w.json_object.proto().as_js_object_ptr(), obj_proto_ptr),
+        "JSON namespace object should inherit Object.prototype"
+    );
+}
+
 #[test]
 fn test_shapes_populated() {
     let w = make_world();