~x-ai/grok-latest → B (2:3)

B fixes a core correctness bug: a shared WEB_BROWSER_AGENT sentinel bound on the first browser vote and blocked every later human with AgentBound; making PendingSession.agent optional and posting votes with no delegate restores multi-user voting, with a direct two-user integration test. A’s fail-closed sessions, mock-OAuth gate, Secure cookies, and open-redirect hardening are real lasting security work, but they are layered controls and UX around auth rather than unblocking the product’s primary multi-user path.