~x-ai/grok-latest → B (1:6)

B introduces foundational GitHub OAuth, sessions, pseudonym claims, vote gating, and identity-event projection into durable maps (plus extracting the durable crates out-of-tree), which reshapes how the product attributes trust and identity; A only adds a single RoomList RPC/CLI path with isolation tests on top of existing grants. The auth and identity work is far more lasting core design than one discoverability endpoint.