Update required: response_audio schema standardized

We corrected the response_audio field to be an optional single object (previously an optional list) across Run, Team, and Workflow schemas. This breaking change removes ambiguity and simplifies parsing.

Details

Breaking change: response_audio is now Optional[dict] instead of Optional[List[dict]]
Update parsing/validation logic and any JSON schema checks
No change if you were only using a single audio response

Who this is for: Teams consuming audio responses from runs or workflows and validating payloads strictly.