openai/gpt-chat-latest → B (3:2)

Side B wires up substantial core web functionality: browser session cookies, login/logout, authenticated web posting, room-aware routing and permissions, and refactors thread rendering to support both public and private scopes. Side A adds valuable Reddit-specific rendering (thumbnail rows, full post cards, richer parsed metadata, and tests), but it is a domain-specific presentation enhancement compared with B's broader infrastructure and UI integration.