Revert "🐛 Fix "Cannot assign to read only property toString" error in plugins runtime"

This reverts commit f796f7ccb9.

plugins/libs/plugins-runtime/src/lib/load-plugin.spec.ts

@@ -22,7 +22,6 @@ vi.mock('./create-plugin', () => ({
 vi.mock('./ses.js', () => ({
   ses: {
     harden: vi.fn().mockImplementation((obj) => obj),
-    hardenIntrinsics: vi.fn(),
   },
 }));
 

plugins/libs/plugins-runtime/src/lib/load-plugin.ts

@@ -52,16 +52,6 @@ export const loadPlugin = async function (
 
     closeAllPlugins();
 
-    // hardenIntrinsics must be called BEFORE harden() to ensure that
-    // override taming (enablePropertyOverrides) converts prototype
-    // properties like Function.prototype.toString into accessor pairs.
-    // Without this, harden() would freeze Function.prototype with plain
-    // data properties, making them non-configurable, which causes
-    // enablePropertyOverrides to silently skip them when hardenIntrinsics
-    // runs later — resulting in "Cannot assign to read only property
-    // 'toString'" errors.
-    ses.hardenIntrinsics();
-
     const plugin = await createPlugin(
       ses.harden(context) as Context,
       manifest,