[fix] stagehand.agent isn't using the correct model defaults

[bennycortese]

So when I ran stagehand.agent out of the box, I kept getting the model set to gpt-4.1-mini by default. This seems to be because the Vercel AI SDK is used as the default for logging, and the model isn't ever getting set to openai/gpt-4.1-mini. This should fix both issues and hopefully fix default model configs for all providers

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🦋 Changeset detected

Latest commit: e6f6d86221e93dc3d0a314598f7d391ac4878069

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@browserbasehq/stagehand	Minor
@browserbasehq/stagehand-evals	Patch

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[stefanbinoj]

IMO it's hardcoded (for some reason) here