openai/gpt-chat-latest → B (1:4)

Side B adds substantive user-facing functionality and supporting infrastructure: it replaces the pin HUD permalink with an unpin POST action, displays pairwise vote counts in the garden UI via a new `edge_vote_count_for_pair` helper, updates CSS/JS, and adds both unit and browser tests to verify the behavior. Side A is a small cleanup that removes a redundant zero-ratio guard in `apply_vote` and adjusts tests to reflect existing parser and edge-handling behavior, which is useful but much narrower in lasting impact.