openai/gpt-chat-latest → A (4:1)

Side A fixes a concrete correctness bug by replacing shared browser sentinel delegates with `None` for web sessions, preventing erroneous `AgentBound` collisions so multiple human users can vote independently. It updates the pending-session model, HTML attribution, CLI polling, and adds an end-to-end integration test verifying two different browser users can vote without creating delegate bindings, whereas Side B is primarily a broad refactor of identity/canonicalization and API conventions with comparatively less direct functional impact.