~x-ai/grok-latest → B (2:5)

B replaces the ad-hoc ParsedUrl combinators and per-host normalize paths with a lasting graph/DFA-based canonicalization design (and thins registry to that API), which underpins ItemId identity project-wide. A is a correct, focused UX cleanup (SSR #new-thread-ui-slot on home and delete ExpandNewThreadForm + toolbar), but it only simplifies one compose flow rather than core URL architecture.