Add UV-only CI tests without Python pre-installation #81

Job	Run time
lint / lint	16s
variants / UV-only (no Python) - Python 3.10	25s
variants / UV-only (no Python) - Python 3.14	25s
variants / build (3.14, windows-latest)	4m 2s
variants / build (3.14, ubuntu-latest)	1m 39s
tests / build (3.10, macos-latest)	22s
typecheck / build	18s
variants / build (3.10, windows-latest)	3m 18s
tests / build (3.10, ubuntu-latest)	14s
variants / build (3.10, macos-latest)	1m 26s
variants / build (3.14, macos-latest)	1m 26s
tests / build (3.11, ubuntu-latest)	17s
tests / build (3.12, windows-latest)	58s
tests / build (3.12, ubuntu-latest)	16s
variants / build (3.10, ubuntu-latest)	1m 29s
tests / build (3.11, windows-latest)	52s
tests / build (3.10, windows-latest)	44s
tests / build (3.14, windows-latest)	58s
tests / build (3.12, macos-latest)	30s
tests / build (3.13, windows-latest)	44s
tests / build (3.14, ubuntu-latest)	11s
tests / build (3.11, macos-latest)	18s
tests / build (3.13, macos-latest)	19s
tests / build (3.13, ubuntu-latest)	12s
tests / build (3.14, macos-latest)	27s
Build & verify package	16s
Publish in-dev package to test.pypi.org	13s
Publish released package to pypi.org	-1s
docs	0s
	22m 34s

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