~x-ai/grok-latest → B (3:1)

B’s commit changes the product’s core model (room vs thread/tag, ScopeId::Room, grants keyed by room) and replaces many REST handlers with a single batched RPC surface wired through CLI, reducer, events, and tests—foundational multi-room architecture. A adds a high-quality, well-tested URL DFA/graph module, but it is a focused subsystem rather than a platform-wide lasting redesign; much of B’s size is necessary consolidation, not mere churn.