Add conversation package registry

mindspace-conversation-package-registry.mjs

@@ -0,0 +1,39 @@
+function registryError(message, code) {
+  return Object.assign(new Error(message), { code });
+}
+
+function requireMethod(target, methodName, code) {
+  if (!target || typeof target[methodName] !== 'function') {
+    throw registryError(`MindSpace conversation package registry requires ${methodName}`, code);
+  }
+}
+
+export function createConversationPackageRegistry({ store, service } = {}) {
+  requireMethod(store, 'upsertPackage', 'missing_conversation_package_store');
+  requireMethod(store, 'upsertArtifact', 'missing_conversation_package_store');
+  requireMethod(store, 'getPackageBySession', 'missing_conversation_package_store');
+  requireMethod(store, 'listArtifacts', 'missing_conversation_package_store');
+  requireMethod(service, 'putConversationManifest', 'missing_mindspace_service');
+
+  return {
+    async ensurePackage(input) {
+      return store.upsertPackage(input);
+    },
+
+    async recordArtifact(input) {
+      return store.upsertArtifact(input);
+    },
+
+    async writeManifestForSession({ userId, sessionId }) {
+      const packageRecord = await store.getPackageBySession(userId, sessionId);
+      if (!packageRecord) return null;
+      const artifacts = await store.listArtifacts(packageRecord.id);
+      return service.putConversationManifest({ packageRecord, artifacts });
+    },
+  };
+}
+
+export const conversationPackageRegistryInternals = {
+  registryError,
+  requireMethod,
+};