docs: update documentation files and fix linting issues

tests/physics/test_radiative.py

@@ -21,20 +21,24 @@ class TestRadiativeEndpointHandling:
         result = rc(W_near_end)
 
         assert not np.isnan(result[0]), "Resummed correction must be finite at endpoint"
-        assert not np.isinf(result[0]), "Resummed correction must not diverge at endpoint"
+        assert not np.isinf(
+            result[0]
+        ), "Resummed correction must not diverge at endpoint"
 
     @pytest.mark.physics
     def test_standard_mode_diverges(self):
         """Without resummation, δᵣ → −∞ as W → W₀ (logarithmic divergence)."""
         rc = RadiativeCorrection(W0=5.0, use_endpoint_resummation=False)
 
-        W_far = np.array([4.9])   # ΔW = 0.1
+        W_far = np.array([4.9])  # ΔW = 0.1
         W_close = np.array([4.99])  # ΔW = 0.01
 
         val_far = rc(W_far)[0]
         val_close = rc(W_close)[0]
 
-        assert val_close < val_far, "Standard mode must show divergent behavior near endpoint"
+        assert (
+            val_close < val_far
+        ), "Standard mode must show divergent behavior near endpoint"
 
 
 class TestRadiativeEnergyDependence:
@@ -51,7 +55,9 @@ class TestRadiativeEnergyDependence:
         r_mid = rc(mid_W)[0]
         r_near = rc(near_end_W)[0]
 
-        assert r_near <= r_mid, f"Correction factor should decrease near endpoint: {r_mid} → {r_near}"
+        assert (
+            r_near <= r_mid
+        ), f"Correction factor should decrease near endpoint: {r_mid} → {r_near}"
 
 
 class TestRadiativeResummationSwitch:
@@ -73,8 +79,12 @@ class TestRadiativeResummationSwitch:
         r_standard = rc_standard(W_near)[0]
 
         assert not np.isnan(r_resummed), "Resummed mode must be finite"
-        assert not np.isnan(r_standard), "Standard mode must be finite (mask protects endpoint)"
-        assert r_resummed > r_standard, f"Near endpoint: resummed={r_resummed} > standard={r_standard}"
+        assert not np.isnan(
+            r_standard
+        ), "Standard mode must be finite (mask protects endpoint)"
+        assert (
+            r_resummed > r_standard
+        ), f"Near endpoint: resummed={r_resummed} > standard={r_standard}"
 
     @pytest.mark.physics
     def test_resummation_only_near_endpoint(self):
@@ -87,9 +97,9 @@ class TestRadiativeResummationSwitch:
         r_resummed_far = rc_resummed(W_far)[0]
         r_standard_far = rc_standard(W_far)[0]
 
-        assert np.isclose(r_resummed_far, r_standard_far, rtol=1e-10), (
-            f"Far from endpoint: resummed={r_resummed_far}, standard={r_standard_far}"
-        )
+        assert np.isclose(
+            r_resummed_far, r_standard_far, rtol=1e-10
+        ), f"Far from endpoint: resummed={r_resummed_far}, standard={r_standard_far}"
 
         # Very near endpoint (delta_W < delta_cut): resummed is finite and larger
         W_near = np.array([4.9995])
@@ -121,7 +131,9 @@ class TestRadiativeZDependence:
 
         W_test = np.linspace(1.5, 4.5, 10)
         diff = np.abs(rc_z50(W_test) - rc_z1(W_test))
-        assert np.max(diff) > 1e-4, f"Z=1 and Z=50 should differ: max diff = {np.max(diff)}"
+        assert (
+            np.max(diff) > 1e-4
+        ), f"Z=1 and Z=50 should differ: max diff = {np.max(diff)}"
 
     @pytest.mark.physics
     def test_z_correction_magnitude_reasonable(self):
@@ -129,7 +141,9 @@ class TestRadiativeZDependence:
         rc = RadiativeCorrection(W0=5.0, Z=92, use_endpoint_resummation=True)
         W_test = np.array([3.0])
         result = rc(W_test)
-        assert 0.9 < result[0] < 3.0, f"Z=92 correction should be reasonable: {result[0]}"
+        assert (
+            0.9 < result[0] < 3.0
+        ), f"Z=92 correction should be reasonable: {result[0]}"
 
 
 class TestRadiativeAParameter:
@@ -138,8 +152,12 @@ class TestRadiativeAParameter:
     @pytest.mark.physics
     def test_a_affects_nuclear_model_correction(self):
         """A parameter affects the nuclear-structure-dependent part of O(Z*alpha^2)."""
-        rc_a100 = RadiativeCorrection(W0=5.0, Z=50, A=100, use_endpoint_resummation=True)
-        rc_a140 = RadiativeCorrection(W0=5.0, Z=50, A=140, use_endpoint_resummation=True)
+        rc_a100 = RadiativeCorrection(
+            W0=5.0, Z=50, A=100, use_endpoint_resummation=True
+        )
+        rc_a140 = RadiativeCorrection(
+            W0=5.0, Z=50, A=140, use_endpoint_resummation=True
+        )
 
         W_test = np.array([3.0])
         assert rc_a100(W_test)[0] != rc_a140(W_test)[0], (