openai/gpt-chat-latest → B (4:1)

Side B adds a substantive end-user capability by introducing a CLI `room create` command wired through the existing RPC, updates documentation, and simplifies the room model by removing the unused visibility field and replacing the room registry with a `HashSet` of room IDs. Side A is a focused UI cleanup that server-renders the collapsed new-thread slot on the home page and removes the now-redundant `ExpandNewThreadForm` action, but its impact is primarily eliminating duplicate UI flow rather than adding or restructuring core functionality.