Implemented the full clean rewrite for Gitea

tests/test_state.py

@@ -0,0 +1,28 @@
+from __future__ import annotations
+
+from pathlib import Path
+
+import pytest
+
+from blackout_notifier.state import StateError, StateRepository, empty_state
+
+
+def test_state_round_trip_is_deterministic(tmp_path: Path) -> None:
+    repository = StateRepository(tmp_path / "nested" / "outages.json")
+
+    repository.save(empty_state())
+    first = repository.path.read_text(encoding="utf-8")
+    repository.save(repository.load())
+
+    assert repository.load() == empty_state()
+    assert repository.path.read_text(encoding="utf-8") == first
+
+
+def test_corrupt_state_fails_closed(tmp_path: Path) -> None:
+    path = tmp_path / "outages.json"
+    path.write_text("not json", encoding="utf-8")
+
+    with pytest.raises(StateError, match="Cannot read state"):
+        StateRepository(path).load()
+
+    assert path.read_text(encoding="utf-8") == "not json"