fix: harden prerender publication boundary

src/entry-client.ts

@@ -1,4 +1,5 @@
 import { createApp } from './app';
+import { validateAndFreezeProductionInputSnapshot } from './content/production-input-snapshot';
 import type { ProductionInputs } from './content/types';
 
 export const readProductionInputsSnapshot = (source: Document): Readonly<ProductionInputs> => {
@@ -16,7 +17,7 @@ export const readProductionInputsSnapshot = (source: Document): Readonly<Product
     throw new Error('The inert portfolio input snapshot is empty.');
   }
 
-  return JSON.parse(serializedInputs) as Readonly<ProductionInputs>;
+  return validateAndFreezeProductionInputSnapshot(JSON.parse(serializedInputs) as unknown);
 };
 
 const appRoot = document.getElementById('app');