Harden AI Docker runtime imports

backend/tests/test_docker_runtime_config.py

@@ -27,6 +27,9 @@ def test_backend_dockerfile_installs_approved_gis_runtime_stack() -> None:
     assert "libgeos-dev" in dockerfile
     assert "libproj-dev" in dockerfile
     assert "proj-bin" in dockerfile
+    assert "libxcb1" in dockerfile
+    assert "libgl1" in dockerfile
+    assert "libglib2.0-0" in dockerfile
 
 
 def test_backend_pyproject_exposes_gis_optional_dependency_group() -> None:
@@ -47,6 +50,9 @@ def test_all_in_one_dockerfile_can_opt_into_ai_dependencies_without_base_install
     assert 'extras=".[gis,ai]"' in dockerfile
     assert "python scripts/gis_import_smoke.py" in dockerfile
     assert "yolo_preflight.py" in dockerfile
+    assert "libxcb1" in dockerfile
+    assert "libgl1" in dockerfile
+    assert "libglib2.0-0" in dockerfile
 
 
 def test_compose_does_not_require_missing_root_env_file() -> None: