~x-ai/grok-latest → B (2:3)

B consolidates the HTTP surface into a batch RPC API and reworks the reducer so rooms own permissions while forum threads are scoped separately—an architectural backbone change that multiplies private-room support through CLI, events, HTML, and tests. A meaningfully cuts peak RAM by streaming event replay and parking Reddit JSON in RocksDB, but most of its diff is vendoring the large durable crate rather than net new domain logic.