openai/gpt-chat-latest → B (1:4)

Side B adds a substantial new user-facing capability by introducing a CLI `room create` command, wiring it through the RPC layer, updating the server implementation, simplifying room state from a `HashMap` with unused visibility to a `HashSet`, and updating tests and documentation accordingly. Side A is a small cleanup that removes a redundant zero-ratio guard in `apply_vote` and adjusts a test to reflect existing zero-weight edge handling, which is useful but much narrower in impact.