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.

tests/unit/coding-conversations-store.test.tsx

@@ -138,6 +138,75 @@ function ids() {
 }
 
 describe('coding Conversation store', () => {
+  it('queues observation sync only for a live completed ordinary prompt', () => {
+    const queueSettledSessionSync = vi.fn();
+    const store = createCodingConversationStore({
+      getSnapshot: vi.fn(),
+      openEvents: vi.fn(),
+      submitPrompt: vi.fn(),
+      queueSettledSessionSync,
+      createId: ids(),
+    });
+    const running = {
+      ...snapshot('conversation-a', 1, 3),
+      run: { status: 'running', runId: 'run-a', mode: 'prompt' } as const,
+    };
+    store.getState().applySnapshotEvent(snapshotEvent(running));
+
+    expect(queueSettledSessionSync).not.toHaveBeenCalled();
+    store.getState().applyPatchBatchEvent(patchEvent('conversation-a', 4, {
+      op: 'run.state',
+      run: {
+        status: 'idle',
+        runId: 'run-a',
+        settledAt: 1_004,
+        terminalReason: 'completed',
+      },
+    }));
+
+    expect(queueSettledSessionSync).toHaveBeenCalledTimes(1);
+    expect(queueSettledSessionSync).toHaveBeenCalledWith(expect.objectContaining({
+      conversation: expect.objectContaining({ id: 'conversation-a', projectId: 'project-a' }),
+      run: expect.objectContaining({ status: 'idle', terminalReason: 'completed' }),
+      cursor: expect.objectContaining({ seq: 4 }),
+    }));
+  });
+
+  it('does not queue observation sync for hydration or a follow-up settlement', () => {
+    const queueSettledSessionSync = vi.fn();
+    const store = createCodingConversationStore({
+      getSnapshot: vi.fn(),
+      openEvents: vi.fn(),
+      submitPrompt: vi.fn(),
+      queueSettledSessionSync,
+      createId: ids(),
+    });
+    store.getState().applySnapshotEvent(snapshotEvent({
+      ...snapshot('conversation-a', 1, 3),
+      run: {
+        status: 'idle',
+        runId: 'hydrated-run',
+        settledAt: 1_003,
+        terminalReason: 'completed',
+      },
+    }));
+    store.getState().applySnapshotEvent(snapshotEvent({
+      ...snapshot('conversation-b', 1, 3),
+      run: { status: 'running', runId: 'run-b', mode: 'follow-up' },
+    }));
+    store.getState().applyPatchBatchEvent(patchEvent('conversation-b', 4, {
+      op: 'run.state',
+      run: {
+        status: 'idle',
+        runId: 'run-b',
+        settledAt: 1_004,
+        terminalReason: 'completed',
+      },
+    }));
+
+    expect(queueSettledSessionSync).not.toHaveBeenCalled();
+  });
+
   it('isolates interleaved snapshot and patch state for two Conversations', async () => {
     const source = new FakeEventSource();
     const getSnapshot = vi.fn(async (conversationId: string) => snapshot(conversationId));