fix: use full npx path for Windows compatibility #45

Job	Run time
Test npx fallback (py3.12, windows-latest)	2m 43s
Build Package	10s
Type Check	11s
Lint and Format	10s
Test (py3.9, ubuntu-latest)	1m 44s
Test (py3.13, ubuntu-latest)	1m 43s
Test (py3.13, windows-latest)	10m 33s
Test npx fallback (py3.12, ubuntu-latest)	1m 40s
Test (py3.9, windows-latest)	10m 43s
CI Success	3s
	29m 40s

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