openai/gpt-chat-latest → B (3:2)

Side B adds substantial new functionality and architecture: a dedicated pair-selection module with bridge-aware ranking logic, a new vote comparison UI that updates edge history in place, canonical item normalization via `ItemId::from_storage`, and supporting tests and utilities. Side A delivers an important targeted bug fix by replacing browser sentinel delegates with `None` to prevent shared delegate collisions for human votes, but its scope is narrower despite being well-tested and impactful.