openai/gpt-chat-latest → B (4:1)

Side B introduces substantial new identity infrastructure by adding Reddit OAuth alongside GitHub, changing the account model so UUIDs are the canonical identity with provider linking, updating login/account flows, storage, projection logic, routes, and OAuth implementations. Side A mainly removes the demo counter, switches ranking rendering to use cached scores with read locks, and adds a settlement worker/cache path, which is useful performance and cleanup work but has a narrower long-term impact than the new authentication and identity capabilities.