* Split assistant message into separate v1 and v2 pages
- Revert create-assistant-message.mdx to v1 content with updated
OpenAPI path and note pointing users to the v2 page
- Add create-assistant-message-v2.mdx for the v2 endpoint with
AI SDK v5 integration example
- Add v2 page to docs.json navigation (Assistant group)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
* add v2 endpoint to discovery openAPI schema
* update v1 openapi frontmatter
* update v2 page
* add version info to v1
* remove duplicative callout
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Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>