Add managed storage operational probes

tests/test_operational_checks.py

@@ -0,0 +1,42 @@
+from __future__ import annotations
+
+from unittest.mock import patch
+
+from govoplan_files.backend.operational_checks import managed_storage_roundtrip_check
+from govoplan_files.backend.storage.backends import LocalFilesystemStorageBackend
+
+
+def test_managed_storage_roundtrip_removes_probe(tmp_path) -> None:
+    backend = LocalFilesystemStorageBackend(tmp_path)
+
+    with patch(
+        "govoplan_files.backend.operational_checks.get_storage_backend",
+        return_value=backend,
+    ):
+        result = managed_storage_roundtrip_check()
+
+    assert result.state == "ok"
+    assert result.metrics["backend"] == "local"
+    assert list(tmp_path.rglob("*.bin")) == []
+
+
+def test_managed_storage_roundtrip_fails_closed() -> None:
+    class BrokenBackend:
+        name = "broken"
+
+        def put_bytes(self, *_args, **_kwargs):
+            raise OSError("private provider detail")
+
+        def delete(self, *_args, **_kwargs):
+            return None
+
+    with patch(
+        "govoplan_files.backend.operational_checks.get_storage_backend",
+        return_value=BrokenBackend(),
+    ):
+        result = managed_storage_roundtrip_check()
+
+    assert result.state == "error"
+    assert result.readiness_critical is True
+    assert "private provider detail" not in result.detail
+