fix pi052 runtime and training safety

tests/policies/pi052/test_pi052_import.py

@@ -0,0 +1,27 @@
+# Copyright 2026 The HuggingFace Inc. team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import subprocess
+import sys
+
+
+def test_pi052_config_import_does_not_load_model_or_dataset_processor():
+    code = """
+import sys
+from lerobot.policies import PI052Config
+assert PI052Config.__name__ == "PI052Config"
+assert "lerobot.policies.pi052.modeling_pi052" not in sys.modules
+assert "lerobot.policies.pi052.processor_pi052" not in sys.modules
+"""
+    subprocess.run([sys.executable, "-c", code], check=True)