DX: define developer environment with `uv` #477

Job	Run time
pytest / Determine job matrix	8s
style / Determine skipped pre-commit hooks	5s
doc / nb / Execute and build documentation	1m 8s
doc / linkcheck / Check external links	26s
style / Run local pre-commit hooks	46s
pytest / Run unit tests (pwa_pages, 3.12, ubuntu-24.04)	37s
style / Push changes	1s
doc / Upload to GitHub Pages	1s
	3m 12s

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