Ports tests/test_popularity_score.py from the Lotto sibling project
(same purpose: pin down known overplayed combinations scoring lower
than spread ones), adapted for 5 main numbers and adds coverage for
the Euro-number determinism bug fixed in 0285a1c (tips #1-3 used to
always return the identical pair). Also documents beautifulsoup4 as
a required dependency in the README, which was missing despite
update_from_eurojackpot_zahlen_eu.py needing it.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
