~x-ai/grok-latest → B (1:9)

B fixes a real multi-user bug by removing shared browser sentinel agents (WEB_BROWSER_AGENT/INVITE_BROWSER_AGENT), making PendingSession.agent optional, and stopping UI votes/posts from binding a delegate—backed by integration tests for two humans voting successfully. A only trims forum compose markup (toggle, labels, JSON error targets) and rewords placeholders, a cosmetic UI churn with little lasting design impact.