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_particles.py

@@ -49,9 +49,7 @@ def test_ground_state_nucleus_resolved_via_particle_package():
     """He-4 (Z=2, A=4) is a common nuclide in `particle`'s ground-state table."""
     mass, charge = particle_mass_charge(1000020040)
     assert charge == pytest.approx(2.0)
-    assert mass == pytest.approx(
-        4 * 931.494, rel=0.05
-    )  # near A*amu, binding-energy-corrected
+    assert mass == pytest.approx(4 * 931.494, rel=0.05)  # near A*amu, binding-energy-corrected
 
 
 def test_nuclear_isomer_falls_back_to_z_a_decode():
@@ -174,9 +172,7 @@ def test_decode_topn_class_other_drop_returns_zero_sentinel():
 def test_decode_topn_class_other_sample_stays_within_members():
     topn_map, n_classes = _topn_fixture()
     rng = np.random.default_rng(0)
-    out = decode_topn_class(
-        np.full(50, 3), topn_map, n_classes, other_policy="sample", rng=rng
-    )
+    out = decode_topn_class(np.full(50, 3), topn_map, n_classes, other_policy="sample", rng=rng)
     assert set(out.tolist()) <= {2212, 2112}