~x-ai/grok-latest → B (1:5)

B replaces the hand-rolled URL combinator stack (engine.rs + per-host normalize_* in registry) with a semantic graph/DFA design that becomes the lasting ItemId canonicalization core, including hierarchy/breadcrumbs. A only shrinks tests.edn to one auto ns-pattern suite—useful maintenance hygiene, but far smaller and less foundational than the URL rewrite.