fix: close PI-140 cutover gaps

Back up unknown legacy Agents, reconnect settled Conversation observation, remove remaining active repository residue, and restore the bundled Python verifier import.

src/lib/agent-session-sync.ts

@@ -6,6 +6,7 @@ import {
   useUserProfileStore,
 } from '@/stores/user-profile';
 import type { RawMessage } from '@/types/chat';
+import type { ConversationSnapshot } from '@/types/coding-conversation';
 import type {
   AgentSessionData,
   AgentSessionMessage,
@@ -338,14 +339,7 @@ async function flushUpload(key: string): Promise<void> {
   }
 }
 
-/** Queue a completed local session snapshot without blocking the chat turn. */
-export function queueAgentSessionSync(
-  projectId: string,
-  sessionId: string,
-  messages: readonly RawMessage[],
-): void {
-  const data = buildAgentSessionData(projectId, sessionId, messages);
-  if (!data) return;
+function queueAgentSessionData(data: AgentSessionData): void {
   const userId = getCurrentAccountKey();
   if (!userId) return;
 
@@ -356,6 +350,44 @@ export function queueAgentSessionSync(
   scheduleUpload(key, SESSION_UPLOAD_DEBOUNCE_MS);
 }
 
+/** Queue a completed local session snapshot without blocking the chat turn. */
+export function queueAgentSessionSync(
+  projectId: string,
+  sessionId: string,
+  messages: readonly RawMessage[],
+): void {
+  const data = buildAgentSessionData(projectId, sessionId, messages);
+  if (!data) return;
+  queueAgentSessionData(data);
+}
+
+/** Queue the final product Conversation snapshot after a completed prompt turn. */
+export function queueCodingConversationSessionSync(snapshot: ConversationSnapshot): void {
+  const messages: RawMessage[] = snapshot.nodes.flatMap((node) => {
+    if (node.kind !== 'message') return [];
+    return [{
+      id: node.id,
+      role: node.role,
+      content: node.blocks.flatMap((block) => (
+        block.kind === 'text' ? [{ type: 'text', text: block.text }] : []
+      )),
+      isError: node.status === 'error' || node.status === 'aborted',
+    } satisfies RawMessage];
+  });
+  const settledAt = snapshot.run.settledAt;
+  const updatedAt = typeof settledAt === 'number' && Number.isFinite(settledAt)
+    ? new Date(settledAt).toISOString()
+    : new Date().toISOString();
+  const data = buildAgentSessionData(
+    snapshot.conversation.projectId,
+    snapshot.conversation.id,
+    messages,
+    updatedAt,
+  );
+  if (!data?.messages.some((message) => message.role === 'assistant')) return;
+  queueAgentSessionData(data);
+}
+
 /** Flush persisted session snapshots after login or profile bootstrap. */
 export async function flushPendingAgentSessionSync(): Promise<void> {
   hydratePendingUploads();