fix(agentstack-cli): display help on no-args

[JanPokorny]

Summary

Linked Issues

Fixes #1759

Documentation

• No Docs Needed:

If this PR adds new feature or changes existing. Make sure documentation is adjusted accordingly. If the docs is not needed, please explain why.

[gemini-code-assist]

Summary of Changes

Hello @JanPokorny, I'm Gemini Code Assist¹! 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 resolves an issue where the agentstack-cli might not have correctly displayed its help message when executed without any arguments. It achieves this by refactoring the help text into a dedicated constant and implementing a custom callback function that ensures the help message is consistently presented under the appropriate conditions, thereby enhancing the overall user experience for the command-line interface.

Highlights

• Refactored Help Text Handling: The main help message for the agentstack CLI has been extracted from a class method into a global HELP_TEXT constant, simplifying its definition and access.
• Custom Help Display Logic: A new main callback function has been introduced, decorated with @app.callback(invoke_without_command=True), which explicitly checks if no subcommand was invoked or if the --help flag is present. If either condition is true, it displays the HELP_TEXT and exits.
• Removed AliasGroup Dependency: The AliasGroup class and its associated RootHelpGroup are no longer used or imported, streamlining the CLI's internal help mechanism.

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[gemini-code-assist]

Code Review

This pull request fixes an issue where the CLI did not display a help message when run without any arguments. The implementation has been refactored to use a standard typer callback instead of a custom group class, which is a good improvement for maintainability. The fix correctly shows the custom help text when no command is provided or when --help is used. I've pointed out one potential issue regarding shell completion being disabled.