~x-ai/grok-latest → B (2:1)

B fixes lasting correctness: agent attribution via out-of-band delegate_opt instead of embedding WEB_BROWSER_AGENT in the DSL body, and stops silently expanding the compare pool to all items when siblings < 2. A’s per-group rank gradients, center-anchored slider polarity, and history/HUD alignment (with tests) are real UX fixes, but B’s protocol and pair-selection behavior outweigh A’s presentation-layer work and B’s route-rename noise.