openai/gpt-chat-latest → A (4:1)

Side A fixes a production reliability issue by requiring OAuth when credentials exist, preventing fallback to blocked public Reddit endpoints, adding token refresh/retry on 401/403, improving error propagation, and covering the behavior with a test. Side B adds a useful UI feature for copying garden rankings as markdown with routing, rendering, and tests, but it is an incremental convenience feature rather than a foundational correctness and availability improvement.