fix: enforce approved media publication closure

src/content/schemas.ts

@@ -297,11 +297,21 @@ export const parseProductionInputSnapshot = (input: unknown): ProductionInputs =
       technology.assetId === undefined ? [] : [technology.assetId])),
     ...(content.metadata.socialPreviewAssetId === undefined ? [] : [content.metadata.socialPreviewAssetId]),
   ];
+  const seenReferences = new Set<string>();
   for (const assetId of referencedAssetIds) {
+    if (seenReferences.has(assetId)) {
+      throw new Error(`Duplicate public asset reference: ${assetId}`);
+    }
+    seenReferences.add(assetId);
     if (!manifestIds.has(assetId)) {
       throw new Error(`Unmanifested asset reference: ${assetId}`);
     }
   }
+  for (const assetId of manifestIds) {
+    if (!seenReferences.has(assetId)) {
+      throw new Error(`Unreferenced manifest asset: ${assetId}`);
+    }
+  }
   return { content, manifest, site } as ProductionInputs;
 };