openai/gpt-chat-latest → A (4:1)

Side A fixes a concrete correctness issue by replacing shared browser sentinel delegates with `None` for web sessions, updating pending-session types to `Option<String>`, and adjusting attribution logic so browser users no longer collide on a shared delegate. It also adds an integration test proving two different browser users can both vote successfully without creating `AgentBound` entries, whereas Side B is a broader feature addition (manual Reddit fetching, persisted entity imports, dotenv support) whose value is less directly tied to fixing an existing correctness problem.