~anthropic/claude-sonnet-latest → B (6:4)

Side B is a substantive feature: it wires up a full room-create path from CLI through RPC to reducer/events, simplifying a dead/unused visibility concept, updating tests, and adding docs/help text—net simplification plus new user-facing capability. Side A is a valuable but narrower bugfix restoring test infra (HTTP server byte handling, regex split, error trapping) that only affects test reliability, not production code or features.