Document preferred deployment for Slack agent

[mintlify]

Summary

• Added a new "Choose a deployment" section to the Slack agent docs explaining how multi-deployment organizations can select which deployment the agent works with
• Documents the deployment picker dropdown, the option to set a preferred default, and the 24-hour cooldown before the prompt reappears

What shipped

The Slack agent now supports configurable preferred deployments. When an organization has multiple deployments, users are prompted to choose one via a dropdown in Slack. They can optionally save their choice as a default for future requests.

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Note

Low Risk
Low risk documentation-only change that adds guidance for multi-deployment Slack users; no product logic is modified.

Overview
Adds a new “Choose a deployment” section to agent/slack.mdx documenting how the Slack agent prompts multi-deployment orgs to pick a deployment, optionally save it as a personal default, and how the 24-hour re-prompt behavior works.

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