openai/gpt-chat-latest → B (4:1)

Side B adds a substantial new user-facing capability: pool-scoped voting, extending the `/vote` flow with a `pool` parameter, automatic pair selection from a parent's children, preserved navigation context after voting, new UI links, request validation, and wiring through handlers and rendering. Side A mainly refactors recent-vote storage from a deque to an append-only list with query-time capping, removing write-time trimming and adding a regression test; while useful as a storage design simplification, it is narrower in project impact than the end-to-end feature introduced in Side B.