Switch CLI to clai

[samuelcolvin]

Thanks to @apockill kindly donating us the clai PyPI package name, we now have a much shorter name for a CLI, which will allow users to do:

uvx clai

TODO:

• check the clai PyPI package is configured for auto-release
• update docs

[hyperlint-ai]

PR Change Summary

Updated the command line interface to use the new clai package, enhancing usability and installation options.

• Introduced the clai command for a more concise CLI experience
• Added usage instructions for the new clai package
• Included help documentation for command line options and special prompts

Added Files

• clai/README.md

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[github-actions]

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