~x-ai/grok-latest → A (2:1)

A changes the core sorter language: votes become explanation-first (`{reason}` then comparison) with a real parser split (block-prefixed votes vs path-then-body items), docs, UI payloads, and fixtures updated to match—lasting product/DSL design. B is valuable infra (collapse `/r/{short}/{slug}` to one segment via `room_route_segment`, plus YouTube/query URL normalization) but is mostly routing/identity cleanup rather than a domain-model shift.