Chat SDK adds native Slack agent support

Short summary

Vercel's Chat SDK now ships a native Slack adapter supporting full agent messaging: suggested prompts, rotating status messages, token-by-token streaming, and built-in feedback buttons. The adapter handles Slack's per-message threading by using Chat SDK transcripts for conversation history. GovSlack and non-streaming workspaces get an automatic post-and-edit fallback.

• •Chat SDK adds .Slack adapter for native Slack agent experiences
• •Supports streaming replies, suggested prompts, and feedback buttons
• •Falls back to post-and-edit for workspaces without streaming support

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