fix: tolerate damaged contribution files

tests/test_repository.py

@@ -95,6 +95,19 @@ def test_repository_accepts_local_date_input_and_rejects_invalid_dates(tmp_path)
         repository.create_member(first_name="Invalid", last_name="Date", birth_date="31.02.2000")
 
 
+def test_repository_reports_empty_contributions_file(tmp_path) -> None:
+    repository = MemberRepository(tmp_path)
+    repository.initialize()
+    member = repository.create_member(first_name="Empty", last_name="Contributions")
+    path = repository.members_root / member.member_id / "contributions.json"
+    path.write_text("", encoding="utf-8")
+
+    with pytest.raises(RepositoryError, match="contributions.json konnte nicht gelesen"):
+        repository.get_contributions(member.member_id)
+
+    assert any("contributions.json" in error for error in repository.validate())
+
+
 def test_member_path_rejects_traversal(tmp_path) -> None:
     repository = MemberRepository(tmp_path)
     repository.initialize()

tests/test_rules.py

@@ -106,3 +106,23 @@ def test_failed_run_does_not_advance_persisted_run_id(tmp_path) -> None:
 
     assert (repository.root / "hausmeister.json").read_bytes() == state_before
     assert not (repository.root / ".hausmeister.lock").exists()
+
+
+def test_broken_contributions_file_creates_task_without_overwriting_file(tmp_path) -> None:
+    repository = MemberRepository(tmp_path)
+    repository.initialize()
+    member = repository.create_member(first_name="Broken", last_name="Contributions", birth_date="1990-01-01")
+    member.status = "active"
+    member.accepted_at = "2026-01-01"
+    member.membership_started_at = "2026-01-01"
+    repository.save_member(member)
+    path = repository.members_root / member.member_id / "contributions.json"
+    path.write_bytes(b"")
+
+    findings = Housekeeper(repository).run(today=date(2026, 6, 21))
+
+    assert path.read_bytes() == b""
+    assert [finding.code for finding in findings] == ["invalid_contributions_file"]
+    state = json.loads((repository.root / "hausmeister.json").read_text(encoding="utf-8"))
+    task = next(item for item in state["items"] if item["code"] == "invalid_contributions_file")
+    assert task["status"] == "open"