[WIP] Add simple GitHub Actions for Python data science

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Original prompt

Create simple GitHub Actions for Python data science. Use UV package manager for fast installs. Include composite action, PowerShell generators, examples, cross-platform support. Simple YAML only, no complex syntax. Support minimal/standard/research/gpu package levels. No emojis anywhere. Focus on reliability over features. Include testing workflows, caching, error handling. Clean docs with quick start guide.

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