openai/gpt-chat-latest → B (4:1)

Side B removes the legacy GitDiscovery projection path and makes the evidence model authoritative by requiring emission metadata fields, deleting fallback lookup code, simplifying epoch/commit pages to use Evidence events only, and returning not-found instead of synthesizing historical views. In contrast, Side A mixes one real behavior fix (avoiding fallback to all items when the sibling pool is too small and passing delegate attribution out-of-band) with lower-impact UI and routing changes such as removing the swap button and renaming `/vote/compare` to `/vote`.