Rank game (rank engine route)

Not a separate app. Adam's filter -> score -> rank grammar (bead howard-offering-aac5.2.4, 2026-09-11): rank is ONE engine and ranking games is one of its routes; rank-game.ukacq.com is a planned discoverability host for that route. Nothing serves it yet. The rank engine answers today at rank.ukacq.com (an alias on the fsrs row).