Resolves an intellibrix IntellibrixProvider from a
"<vendor>:<model>" string (e.g. "anthropic:claude-sonnet-5"), backed by
whichever @ai-sdk/* vendor adapter is installed. Throws an actionable
error naming the missing package if the vendor's adapter isn't installed.
Resolves an intellibrix IntellibrixProvider from a
"<vendor>:<model>"string (e.g."anthropic:claude-sonnet-5"), backed by whichever@ai-sdk/*vendor adapter is installed. Throws an actionable error naming the missing package if the vendor's adapter isn't installed.