Checkpoint peering identity and opt-in discovery

scraper/lib/metadata-merge.js

@@ -2,6 +2,7 @@
 
 const IMPORTED_FIELDS = ['title', 'altTitles', 'authors', 'status', 'year', 'tags', 'description'];
 const same = (a, b) => JSON.stringify(a) === JSON.stringify(b);
+const { normalizeWorkIdentity, sameWorkIdentity } = require('./work-identity');
 
 // The effective fields remain at the top of manga.json. A snapshot of the last
 // imported values lets later imports refresh unchanged fields without replacing
@@ -25,6 +26,12 @@ function mergeImportedMetadata(prior, imported, fallbackTitle) {
     throw new Error(`AniList identity conflict: existing ${oldId}, imported ${newId}; review the manga match`);
   }
   if (imported['x-anilist']) result['x-anilist'] = { ...(prior['x-anilist'] || {}), ...imported['x-anilist'] };
+  const oldWorkIdentity = normalizeWorkIdentity(prior['x-work-identity']);
+  const newWorkIdentity = normalizeWorkIdentity(imported['x-work-identity']);
+  if (oldWorkIdentity && newWorkIdentity && !sameWorkIdentity(oldWorkIdentity, newWorkIdentity)) {
+    throw new Error(`MangaCircus work identity conflict: existing ${oldWorkIdentity.kind} identity differs from imported ${newWorkIdentity.kind} identity`);
+  }
+  if (newWorkIdentity) result['x-work-identity'] = newWorkIdentity;
   const snapshot = { ...previous };
   for (const field of IMPORTED_FIELDS) if (Object.hasOwn(imported, field)) snapshot[field] = imported[field];
   if (Object.keys(snapshot).length) result['x-metadata'] = { ...(prior['x-metadata'] || {}), imported: snapshot };