docs: add tutorials for using early access AI agent features (#17186)

Some content is still being merged, but the structure is still there

Preview: https://coder.com/docs/@ai-features/tutorials/ai-agents

docs/tutorials/ai-agents/coder-dashboard.md

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+> [!NOTE]
+>
+> This functionality is in early access and subject to change. Do not run in
+> production as it is unstable. Instead, deploy these changes into a demo or
+> staging environment.
+>
+> Join our [Discord channel](https://discord.gg/coder) or
+> [contact us](https://coder.com/contact) to get help or share feedback.
+
+## Prerequisites
+
+- A Coder deployment with v2.21 or later
+- A [template configured for AI agents](./create-template.md)
+
+## Overview
+
+Once you have an agent running and reporting activity to Coder, you can view
+status and switch between workspaces from the Coder dashboard.
+
+![Coder Dashboard](../../images/guides/ai-agents/workspaces-list.png)
+
+![Workspace Details](../../images/guides/ai-agents/workspace-details.png)
+
+## Next Steps
+
+- [Supervise Agents in the IDE](./ide-integration.md)
+- [Supervise Agents Programmatically](./headless.md)
+- [Securing Agents](./securing.md)