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/headless.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 manage
+it programmatically via the MCP server, Coder CLI, and/or REST API.
+
+## MCP Server
+
+Power users can configure [Claude Desktop](https://claude.ai/download), Cursor,
+or other tools with MCP support to interact with Coder in order to:
+
+- List workspaces
+- Create/start/stop workspaces
+- Run commands on workspaces
+- Check in on agent activity
+
+In this model, an [IDE Agent](./agents.md#in-ide-agents) could interact with a
+remote Coder workspace, or Coder can be used in a remote pipeline or a larger
+workflow.
+
+The Coder CLI has options to automatically configure MCP servers for you. On
+your local machine, run the following command:
+
+```sh
+coder mcp claude-desktop # Configure Claude Desktop to interact with Coder
+coder mcp cursor # Configure Cursor to interact with Coder
+```
+
+## Coder CLI
+
+Workspaces can be created, started, and stopped via the Coder CLI. See the
+[CLI docs](../../reference/cli/) for more information.
+
+## REST API
+
+The Coder REST API can be used to manage workspaces and agents. See the
+[API docs](../../reference/api/) for more information.
+
+## Next Steps
+
+- [Securing Agents](./securing.md)