~x-ai/grok-latest → A (3:2)

A redesigns core pair selection with lasting structure (established-component bridges before isolate pairs, then rank-gap/zip_index within a fully connected pool) plus targeted unit tests for attach and 1v2-before-2v3 behavior. B adds a useful RoomList vertical slice (RPC filter on grants, CLI, isolation integration tests), but it is straightforward grant membership plumbing rather than deeper ranking design.