added ruff code reivew

src/orisys/hhd/domain.py

@@ -56,7 +56,9 @@ def build_masked_factor(lap):
                 options=dict(SymmetricMode=True),
             )
             return lu.solve, numpy.float32
-        except Exception:
+        except Exception:  # noqa: S112 - try the next pivoting strategy
+            # Probe: try the next pivoting strategy; the float64 fallback below is
+            # returned if every candidate fails, so this failure is not lost.
             continue
     # Last resort: the original pivoting LU on the float64 matrix.
     return sparse_linalg.factorized(lap_csc), numpy.float64
@@ -82,20 +84,20 @@ class MaskedDomain:
     """Reduced Laplacian system on active mask pixels (2D only)."""
 
     __slots__ = (
-        "shape",
-        "mask",
-        "index_map",
-        "factor",
-        "factor_dtype",
-        "lap",
-        "num_active",
-        "pinned",
-        "active_coords",
-        "active_linear_indices",
         "_rhs_buffer",
         "_rhs_pair_buffer",
         "_scatter_buffer",
         "_scatter_pair_buffer",
+        "active_coords",
+        "active_linear_indices",
+        "factor",
+        "factor_dtype",
+        "index_map",
+        "lap",
+        "mask",
+        "num_active",
+        "pinned",
+        "shape",
     )
 
     def __init__(