openai/gpt-chat-latest → B (4:1)

Side B adds substantive user-facing functionality: it introduces pairwise vote counts in the garden UI with a tested helper (`edge_vote_count_for_pair`), changes the pin HUD to perform an unpin action via `POST /ui`, updates styling, and adds browser and unit tests covering the new behavior. Side A mainly corrects thread post indexing semantics by replacing a fallback with `expect`, always rendering the post link, updating documentation, and extending integration tests, which is valuable but much narrower in scope and lasting impact.