find_best_match was using extractOne (which maximises its scorer) with
Levenshtein distance (lower = better), so it returned the worst match
instead of the best. Switch to extract+min to correctly minimise distance.
Fixes 6 failing tests in test_text_correction.py.
CI: run pytest under `coverage run` so coverage.xml has data to report;
drop deprecated use-only-tar-bz2 flag from setup-miniconda steps.
Co-Authored-By: Claude Sonnet 4.6 <[email protected]>
