~x-ai/grok-latest → A (3:1)

Side A introduces a real composable URL canonicalization subsystem (url_rules engine + registry), migrates ItemId to full https URLs, and rewires parent/breadcrumb/storage paths across the core model—foundational identity design with lasting project impact. Side B fixes one broken /- index query and upgrades GitHub import presentation (structured cards, resolvers/ move, CSS), which is valuable product work but narrower and partly UI/reorg relative to A’s identity layer.