~x-ai/grok-latest → B (1:4)

B establishes lasting URL identity rules (strip query/fragment by default, GitHub and YouTube canonicalization), a SystemIngest path, and a working on-demand GitHub resolver with browser coverage—foundational product architecture. A is a solid, tested vote-highlight/polarity UX fix (per-group gradients, center-anchored history sliders), but it is narrower polish on existing vote UI rather than core extensibility.