Align basemap policy defaults

backend/tests/test_sprint116_operational_gis_map_workflow.py

@@ -6,12 +6,16 @@ REPO_ROOT = Path(__file__).resolve().parents[2]
 
 def test_map_uses_road_basemap_with_attribution_and_env_override() -> None:
     geo_map = (REPO_ROOT / "frontend/src/components/GeoMap.tsx").read_text(encoding="utf-8")
+    env_example = (REPO_ROOT / ".env.example").read_text(encoding="utf-8")
 
     assert "DEFAULT_ROAD_BASEMAP_STYLE" in geo_map
     assert "https://tile.openstreetmap.org/{z}/{x}/{y}.png" in geo_map
     assert "OpenStreetMap contributors" in geo_map
     assert "VITE_MAP_STYLE_URL" in geo_map
     assert "AttributionControl" in geo_map
+    assert "VITE_MAP_STYLE_URL=" in env_example
+    assert "https://demotiles.maplibre.org/style.json" not in env_example
+    assert "managed MapLibre style URL" in env_example
 
 
 def test_map_workspace_can_select_persisted_database_layer_and_run_query() -> None: