fix: preserve exploration tool history and cap context budget

tests/conftest.py

@@ -46,6 +46,25 @@ def mock_driver():
     return MockDeviceDriver(device_id="fixture-mock-device", width=1080, height=2400)
 
 
+@pytest.fixture(autouse=True)
+def no_host_data_engine_ipc(monkeypatch, tmp_path, request):
+    """Unit-test events must not reach a user's running desktop queue.
+
+    The reconnect path also reads a port file, so overriding the inherited
+    environment port alone does not isolate tests. IPC tests can explicitly
+    override these discovery functions with their own endpoints or mocks.
+    """
+    if any(
+        request.node.get_closest_marker(name)
+        for name in ("android", "integration", "e2e", "manual")
+    ):
+        return
+    monkeypatch.setattr("artemis.data_engine.engine.read_ipc_port", lambda: None)
+    monkeypatch.setattr(
+        "artemis.data_engine.engine.get_ipc_port_file", lambda: tmp_path / "no-host-ipc"
+    )
+
+
 @pytest.fixture(autouse=True)
 def isolated_plugin_registry(monkeypatch, tmp_path, request):
     """Unit tests never load or mutate the user's installed plugins and credentials."""