~x-ai/grok-latest → A (3:2)

A lands real behavioral fixes: WEB_BROWSER_AGENT moved to out-of-band delegate_opt (correct attribution), sibling pools with <2 items return None instead of falling back to the global item set, and dead “swap sides” UI is removed. B’s display_path href fix is worthwhile and the 45-pair ranking assertion is strong test value, but it is a narrower production change plus test hardening versus A’s multiple correctness fixes.