fix(py/samples/xai-hello): get sample to run

[yesudeep]

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[gemini-code-assist]

Summary of Changes

Hello @yesudeep, 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 addresses an issue preventing the xai-hello sample from executing properly by introducing a fix to its entry point, ensuring its asynchronous operations are correctly initiated. Additionally, the PR updates the project's dependency management setup to utilize uv within tox environments and includes minor organizational changes to pyproject.toml files for better structure.

Highlights

• XAI Hello Sample Fix: The xai-hello sample's main execution logic was refactored to correctly run its asynchronous main function using ai.run_main(), resolving an issue that prevented it from running.
• Dependency Management Update: The tox.ini configuration was updated to leverage uv for dependency installation, improving consistency and potentially performance in test environments.
• Project Configuration Refinements: Minor adjustments were made to pyproject.toml files, including reordering dependency declarations and consolidating lists for brevity.

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[gemini-code-assist]

Code Review

This pull request primarily fixes the xai-hello Python sample to make it runnable. The main change refactors the script's entry point by moving the main async function to the top level and using ai.run_main for execution. This correctly addresses the issue where the sample's main logic was defined but never called. Additional changes include minor stylistic cleanups in noxfile.py and pyproject.toml files, and an update to tox.ini to explicitly use uv for package installation during tests. The changes are sound and improve the codebase. I have not identified any issues of medium or higher severity.