feat(docs): update AgentAstack agent example

[xjacka]

Which issue(s) does this pull-request address?

Closes: #

Description

Checklist

General

• [x] I have read the appropriate contributor guide: Python / TypeScript
• [x] I have signed off on my commit: Python instructions / TypeScript instructions
• [x] Commit messages and PR title follow conventional commits
• [x] Appropriate label(s) added to PR: Python for Python changes, TypeScript for TypeScript changes

Code quality checks

• [x] Code quality checks pass: mise check (mise fix to auto-fix)

Testing

• [x] Unit tests pass: mise test:unit
• [ ] E2E tests pass: mise test:e2e
• [ ] Tests are included (for bug fixes or new features)

Documentation

• [x] Documentation is updated
• [x] Embedme embeds code examples in docs. To update after edits, run: Python mise docs:fix

[gemini-code-assist[bot]]

Summary of Changes

Hello @xjacka, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the AgentStackAgent example by introducing an interactive agent selection mechanism and improving the clarity of agent output. The update makes the example more dynamic and user-friendly, demonstrating how to work with multiple agents more effectively.

Highlights

• Interactive Agent Selection: The AgentStackAgent example has been updated to allow users to interactively select an agent from a list of available agents, rather than using a hardcoded agent name.
• Improved Output Clarity: The debug and response messages from the agent now dynamically include the name of the selected agent, making the output clearer and more informative.
• Documentation Update: The example code in the docs/integrations/agent-stack.mdx file has been synchronized with the updated Python example to reflect these changes.

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