improvements while playing with the CLI

[samuelcolvin]

Please test before merging as this code doesn't have unit tests.

[hyperlint-ai]

PR Change Summary

Enhanced the CLI documentation with new usage instructions and improved clarity.

• Updated the command example for starting the interactive session.
• Added instructions for using the CLI with uvx.

Modified Files

• docs/cli.md

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[github-actions]

Docs Preview

commit:	965950f
Preview URL:	https://7b8a449d-pydantic-ai-previews.pydantic.workers.dev

[Kludex]

I've added a test.

All good here. It works. Autocompletion also works.