Bump ruff line-length to 120 and reformat

Rejoins lines that only wrapped because they exceeded the old 88-char
limit; ruff check and the full test suite (725 passed) are unaffected.

tests/test_loader.py

@@ -315,9 +315,7 @@ def test_build_index_maps_from_files_ordering_independent_of_file_order(tmp_path
 
 def test_build_index_maps_from_files_numeric_sort_for_nuclear_codes(tmp_path):
     path = tmp_path / "a.parquet"
-    pd.DataFrame({"pdg": [22, 1000060120, 11], "material": ["X", "X", "X"]}).to_parquet(
-        path
-    )
+    pd.DataFrame({"pdg": [22, 1000060120, 11], "material": ["X", "X", "X"]}).to_parquet(path)
 
     pdg_map, _ = build_index_maps_from_files([path])
     assert list(pdg_map.keys()) == [11, 22, 1000060120]
@@ -398,9 +396,7 @@ def test_load_event_ids_applies_offset(tmp_path):
     path = tmp_path / "a.parquet"
     pd.DataFrame({"event_id": [0, 1, 2]}).to_parquet(path)
     offset = event_id_offset(1)
-    np.testing.assert_array_equal(
-        load_event_ids(path, offset=offset), [offset, offset + 1, offset + 2]
-    )
+    np.testing.assert_array_equal(load_event_ids(path, offset=offset), [offset, offset + 1, offset + 2])
 
 
 def test_load_event_ids_raises_when_event_id_reaches_stride(tmp_path):