Mirrors test_compare_test_results.py: covers human_kb formatting,
load_sizes (date-keyed and flat), compare() including threshold
boundaries on both growth and shrinkage, format_report, and an
end-to-end main() check that the comment file is only written when
something significant is reported.
Wired into code-quality.yml alongside the existing compare_test_results
unit tests.
Sylvestre Ledru
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