fix: use full npx path for Windows compatibility #43

Job	Run time
Test npx fallback (py3.12, windows-latest)	3m 29s
Type Check	10s
Test (py3.13, windows-latest)	10m 25s
Build Package	10s
Lint and Format	7s
Test (py3.9, ubuntu-latest)	1m 55s
Test npx fallback (py3.12, ubuntu-latest)	1m 54s
Test (py3.9, windows-latest)	10m 46s
Test (py3.13, ubuntu-latest)	1m 48s
CI Success	4s
	30m 48s

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