openai/gpt-chat-latest → A (3:2)

Side A fixes multiple production behaviors: it correctly passes delegate attribution out-of-band instead of embedding it in DSL text, prevents an incorrect fallback to all items when a sibling pool has fewer than two candidates by returning no next pair, and simplifies the public interface by renaming `/vote/compare` to `/vote` while removing the unnecessary swap button. Side B improves URL generation to use display paths and substantially strengthens browser test coverage with a full 45-pair ranking verification, but much of its patch is test code rather than changes to runtime behavior.