Grok Build adds model visibility, worktree control

This is practical trust infrastructure for an increasingly autonomous coding agent. It makes Grok Build easier to debug, audit, and use safely in parallel workflows.

• –Served-model visibility improves reproducibility, cost tracking, and performance evaluation
• –Worktree creation gives developers a safer boundary for experimental or multi-agent changes
• –Explicit Git isolation reduces the risk of agents contaminating the primary checkout
• –The update improves day-to-day control more than raw coding capability
• –Smart Auto remains an abstraction, but exposing the routed model makes that abstraction less opaque