Add session scoped runs and cancellation

tests/test_gui_server.py

@@ -104,6 +104,14 @@ class GuiServerTests(unittest.TestCase):
             _, state = _build_client(Path(d))
             self.assertIs(state.run_lock_for('alice'), state.run_lock_for('alice'))
             self.assertIsNot(state.run_lock_for('alice'), state.run_lock_for('bob'))
+            self.assertIs(
+                state.run_lock_for('alice', 's1'),
+                state.run_lock_for('alice', 's1'),
+            )
+            self.assertIsNot(
+                state.run_lock_for('alice', 's1'),
+                state.run_lock_for('alice', 's2'),
+            )
 
     def test_state_update_rejects_missing_cwd(self) -> None:
         with tempfile.TemporaryDirectory() as d:
@@ -166,7 +174,7 @@ class GuiServerTests(unittest.TestCase):
         with tempfile.TemporaryDirectory() as d:
             root = Path(d)
             client, state = _build_client(root)
-            agent = state.agent_for('alice')
+            agent = state.agent_for('alice', 'pending-1')
 
             def fake_run(
                 prompt: str,
@@ -209,6 +217,27 @@ class GuiServerTests(unittest.TestCase):
             self.assertEqual(response.status_code, 200)
             self.assertEqual(response.json()['session_id'], 'pending-1')
 
+    def test_cancel_run_marks_latest_session_cancelled(self) -> None:
+        with tempfile.TemporaryDirectory() as d:
+            client, state = _build_client(Path(d))
+            record = state.run_manager.start('alice', 'thread-1')
+            self.assertFalse(record.cancel_event.is_set())
+
+            response = client.post(
+                '/api/runs/cancel',
+                json={'account_id': 'alice', 'session_id': 'thread-1'},
+            )
+
+            self.assertEqual(response.status_code, 200)
+            self.assertTrue(response.json()['cancelled'])
+            self.assertTrue(record.cancel_event.is_set())
+            latest = client.get(
+                '/api/runs/latest',
+                params={'account_id': 'alice', 'session_id': 'thread-1'},
+            )
+            self.assertEqual(latest.status_code, 200)
+            self.assertEqual(latest.json()['status'], 'cancelled')
+
     def test_chat_uses_account_scoped_model_config(self) -> None:
         with tempfile.TemporaryDirectory() as d:
             client, _ = _build_client(Path(d))