The pagination guard broke on seen >= maxPerRepo, so a cap of 0 stopped
before the first page and rendered empty productive-time,
productive-weekday and most-commit-language cards. That inverted the
meaning 0 carries for top-repos, where it already means unlimited.
Treat a cap of 0 or less as no cap. Verified against a real repo: a cap
of 100 still stops at 100, while 500 and 0 both walk the full 382-commit
history.
