Master grew Google AI Studio and Antigravity as providers, a doctor that
names each provider's own key, and settings that fetch every hosted
model list as the window opens. OpenCode Go is folded into each: its
name joins SERVICES and the doctor's key table, its key row sits beside
Google's, its Fetch button follows the per-provider pattern Google's
uses, and _load_hosted_models fetches its catalog at open when a key is
on file, filling the cleanup and agent boxes alike.