release: verify_index_release.sh and 0.2.3 changelog

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

tests/test_ci_workflow.py

@@ -4,7 +4,6 @@
 import pathlib
 import re
 
-import pytest
 import yaml
 
 ROOT = pathlib.Path(__file__).resolve().parent.parent
@@ -95,7 +94,6 @@ def test_classifiers_match_matrix():
     assert claimed == expected_versions()
 
 
-@pytest.mark.skipif(not VERIFY_SCRIPT.exists(), reason="added with the release task")
 def test_verify_script_covers_matrix():
     match = re.search(r"^pythons=\(([^)]*)\)", VERIFY_SCRIPT.read_text(), re.M)
     assert match.group(1).split() == expected_versions()