docs: update documentation files and fix linting issues

tests/quality/test_api_fermi.py

@@ -26,19 +26,24 @@ class TestFermiAPI:
         ff = FermiFunction(Z=20, A=40)
         assert "FermiFunction" in repr(ff)
 
+
 class TestFermiProperties:
     """Shared property tests for FermiFunction."""
 
     @pytest.mark.property
-    @pytest.mark.parametrize("W", [
-        [1.5],
-        [1.1, 2.0, 3.0],
-        np.linspace(1.01, 5.0, 20),
-    ])
+    @pytest.mark.parametrize(
+        "W",
+        [
+            [1.5],
+            [1.1, 2.0, 3.0],
+            np.linspace(1.01, 5.0, 20),
+        ],
+    )
     def test_positive(self, W):
         """F₀ must be positive everywhere — it's a probability enhancement factor."""
         ff = FermiFunction(Z=92, A=238)  # Uranium — extreme case
         from tests.common.test_property_tests import _test_positive_values
+
         _test_positive_values(ff, W, component_name="FermiFunction")
 
     @pytest.mark.quality
@@ -48,17 +53,22 @@ class TestFermiProperties:
         ff = FermiFunction(Z=20, A=40)
         W = np.linspace(1.1, 3.0, n)
         from tests.common.test_property_tests import _test_output_shape_preserved
+
         _test_output_shape_preserved(ff, W, component_name="FermiFunction")
 
     @pytest.mark.quality
-    @pytest.mark.parametrize("W", [
-        np.linspace(1.01, 6.0, 50),
-        np.linspace(1.001, 10.0, 100),
-    ])
+    @pytest.mark.parametrize(
+        "W",
+        [
+            np.linspace(1.01, 6.0, 50),
+            np.linspace(1.001, 10.0, 100),
+        ],
+    )
     def test_no_nan(self, W):
         """For very heavy nuclei, the loggamma implementation must not overflow."""
         ff = FermiFunction(Z=92, A=238)
         from tests.common.test_property_tests import _test_no_nan_across_range
+
         _test_no_nan_across_range(ff, W, component_name="FermiFunction")
 
     @pytest.mark.quality