~x-ai/grok-latest → A (2:1)

Commit A removes the shared WEB_BROWSER_AGENT/invite sentinel design that bound AgentBound on the first browser vote and blocked later humans, making delegate Optional end-to-end (auth, PendingSession, UI posts, authorship, poll types) with a multi-user vote integration test—lasting core product correctness. Commit B is a solid production fix (mandatory OAuth when creds exist, 401/403 refresh, no public www fallback, fly.toml base URL) but is narrower operational resilience for the Reddit worker rather than a foundational multi-user model fix.