fix: persist direct chat transcript before Goosed escalation

Prevent portal direct-chat history from being lost when snapshot cache
is invalidated on Goosed submit by writing non-empty messages to DB first,
and stop caching empty Goose placeholder messages in snapshots.

Co-authored-by: Cursor <cursoragent@cursor.com>

conversation-transcript-persist.mjs

@@ -0,0 +1,60 @@
+/**
+ * Persist portal direct-chat transcripts before Goosed escalation wipes snapshot cache.
+ */
+
+import { extractConversationMessageText } from './conversation-memory.mjs';
+
+export function filterNonemptyUserVisibleMessages(messages) {
+  if (!Array.isArray(messages)) return [];
+  return messages.filter((message) => {
+    if (message?.metadata?.userVisible === false) return false;
+    return Boolean(extractConversationMessageText(message));
+  });
+}
+
+export async function loadSnapshotMessages(sessionSnapshotService, sessionId) {
+  if (!sessionSnapshotService?.get || !sessionId) return [];
+  const snapshot = await sessionSnapshotService.get(sessionId).catch(() => null);
+  return Array.isArray(snapshot?.messages) ? snapshot.messages : [];
+}
+
+export async function persistSessionTranscriptMessages({
+  conversationMemoryService,
+  sessionId,
+  userId,
+  messages,
+} = {}) {
+  if (!conversationMemoryService?.saveConversationMessages || !sessionId || !userId) {
+    return { saved: 0, skipped: true };
+  }
+  const persistable = filterNonemptyUserVisibleMessages(messages);
+  if (!persistable.length) return { saved: 0, skipped: true };
+  const saved = await conversationMemoryService.saveConversationMessages(
+    sessionId,
+    userId,
+    persistable,
+  );
+  return { saved: Array.isArray(saved) ? saved.length : persistable.length, skipped: false };
+}
+
+export async function persistSessionTranscriptFromSnapshot({
+  sessionSnapshotService,
+  conversationMemoryService,
+  sessionId,
+  userId,
+  sourceSessionId = null,
+} = {}) {
+  const sourceIds = [...new Set([sourceSessionId, sessionId].filter(Boolean))];
+  let totalSaved = 0;
+  for (const sourceId of sourceIds) {
+    const messages = await loadSnapshotMessages(sessionSnapshotService, sourceId);
+    const result = await persistSessionTranscriptMessages({
+      conversationMemoryService,
+      sessionId,
+      userId,
+      messages,
+    });
+    totalSaved += result.saved;
+  }
+  return { saved: totalSaved };
+}