openai/gpt-chat-latest → A (4:1)

Side A introduces a substantial architectural improvement by separating ranking recomputation from read paths via cached rankings, adding a settlement worker that batches vote persistence and score recomputation, warming the cache at startup, and converting ranking reads to shared locks. It also removes the temporary demo counter feature and associated UI/tests, reducing dead functionality. Side B fixes an important Reddit OAuth reliability issue by requiring OAuth when configured, refreshing tokens on 401/403, and improving error handling, but its impact is confined to one subsystem and is less broadly foundational than the state-management and performance changes in Side A.