Train against merged national roof instances

backend/tests/test_training_loop_supervisor.py

@@ -29,3 +29,14 @@ def test_process_detection_requires_exact_marker(monkeypatch) -> None:
     monkeypatch.setattr(MODULE.subprocess, "run", lambda *args, **kwargs: Result())
     assert MODULE.process_active("geointel", "run_belgium_building_training_loop.py")
     assert not MODULE.process_active("geointel", "other_loop.py")
+
+
+def test_write_state_creates_output_directory_atomically(tmp_path: Path) -> None:
+    state_path = tmp_path / "new-run" / "supervisor-state.json"
+
+    MODULE.write_state(state_path, {"schema_version": 1, "status": "monitoring"})
+
+    written = json.loads(state_path.read_text(encoding="utf-8"))
+    assert written["status"] == "monitoring"
+    assert written["updated_at"]
+    assert not state_path.with_suffix(".json.tmp").exists()