~x-ai/grok-latest → B (2:5)

B replaces the ad-hoc ParsedUrl combinator stack (engine.rs + per-host normalize_* in registry) with a lasting semantic-graph design for ItemId canonicalization and breadcrumbs—core production identity logic—while A only repairs test doubles (regex split on '=', getRequestBody, 302 length, nil token/state) and Playwright helpers so E2E auth runs again. Test mock fixes are real and necessary, but they do not outlast B’s redesign of the URL rules subsystem.