Rank 4 and the genre/mechanic filters ran a correlated subplan per game
(13 s at 10 000 games). Now: one set-based word coverage, filters as one hashed
IN set, 'like all' patterns, similarity only for hits. Adds pgTAP cases found
by mutation testing (paging by relevance, alt title choice, duplicate words,
mechanic duplicates) and a Deno case for mark characters.
Refs #3
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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