~x-ai/grok-latest → B (2:3)

B delivers lasting platform design: centralized room path encoding (`room_route_segment` / fixed-width short id), route and href call-sites updated consistently, plus durable external URL identity normalization (YouTube shapes, sorted query pairs) with real tests. A is a strong, necessary production bugfix (require OAuth when creds exist, AuthRejected + forced refresh, no www.reddit.com fallback, fly.toml base URL), but it is narrower and confined to the Reddit worker path.