openai/gpt-chat-latest → A (5:2)

Side A implements a complete, integrated feature: `/vote` gains a `pool` mode, request parsing and validation are extended, next-pair selection is constrained to a pool, UI links are added for voting on children, and the pool context is preserved through post-success navigation. Side B mainly adds deployment/configuration files plus standalone `event_log.rs` and `views.rs` modules that are not wired into the shown application flow, so the demonstrated lasting project impact is smaller.