feat(google): support agentic video processing in the Interactions API

[aayush-kapoor]

Background

Gemini interactions API now has the capability to agentically understand videos: https://aistudio.google.com/docs/video-understanding#agentic-video-understanding

we previously only supported static understanding. but now agentic is also available

Summary

• video file parts now accept processing: agentic along with static - which are translated into the Gemini Interactions request format
• gemini’s processing_call and processing_result steps are exposed as observable custom parts and preserved across stateless multi-turn requests

End-to-End Verification

verified by running the example http://localhost:3000/chat/google-interactions-agentic-video with a multiturn convo

Checklist

• All commits are signed (PRs with unsigned commits cannot be merged)
• Tests have been added / updated (for bug fixes / features)
• Documentation has been added / updated (for bug fixes / features)
• A patch changeset for relevant packages has been added (for bug fixes / features - run pnpm changeset in the project root)
• I have reviewed this pull request (self-review)

[github-actions]

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Package	Version
ai	7.0.91 github npm
@ai-sdk/amazon-bedrock	5.0.73 github npm
@ai-sdk/angular	3.0.91 github npm
@ai-sdk/anthropic	4.0.49 github npm
@ai-sdk/anthropic-aws	2.0.41 github npm
@ai-sdk/azure	4.0.60 github npm
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