openai/gpt-chat-latest → A (5:1)

Side A adds substantial end-user functionality: browser session cookies, login/logout flows, web posting, room-aware thread pages, routing, permission-aware UI, and supporting APIs, effectively wiring a complete web forum interface back into the application. Side B is a valuable but narrowly scoped maintenance change that fixes potential `RwLock` deadlocks by shortening lock lifetimes and adds regression tests and timeout/logging improvements, but its lasting impact is much smaller than the new capabilities introduced in Side A.