openai/gpt-chat-latest → A (5:2)

Side A fixes a substantive correctness issue by replacing shared browser sentinel delegates with an optional delegate, preventing browser users from sharing a single agent identity that blocked subsequent human votes. It updates session types, authentication flow, UI attribution, CLI polling, and adds an integration test verifying two different browser users can both vote successfully without creating agent bindings. Side B contains useful cleanup and architectural work (removing the demo counter and introducing cached ranking/settlement infrastructure), but much of it is refactoring and optimization without demonstrating a comparable user-facing bug fix.