~x-ai/grok-latest → A (3:1)

Side A delivers a structural ItemId type and migrates the reducer, ranking, RPC, and HTML paths off stringly CanonicalItemUrl keys—lasting core design that the deleted plan.md targeted end-to-end. Side B is a real, precise XSS fix (ammonia on Reddit body_html at two render sites plus tests), but it is narrow compared with the architecture-wide identity change.