feat: validate real-bench seat orchestration and self-repair

tests/unit/test_native_can_integration.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import os
 import unittest
 from pathlib import Path
 from unittest.mock import patch
@@ -162,6 +163,17 @@ class NativeCanIntegrationTests(unittest.TestCase):
         self.assertEqual(info["data"]["bitrate"], 2_000_000)
         self.assertEqual(info["data"]["sample_point_percent"], 80)
 
+    def test_enabling_seat_hardware_does_not_implicitly_enable_vehicle_can(self) -> None:
+        with patch.dict(
+            os.environ,
+            {"COGNITIVE_AGENT_HARDWARE_EXECUTION_ENABLED": "true"},
+            clear=False,
+        ):
+            os.environ.pop("COGNITIVE_AGENT_VEHICLE_CAN_ENABLED", None)
+            settings = VehicleCanSettings.from_env(Path(REPOSITORY_ROOT))
+
+        self.assertFalse(settings.enabled)
+
 
 if __name__ == "__main__":
     unittest.main()