fix: correct detection of wrapper shim on Windows/venv #53

Job	Run time
Lint and Format	10s
Type Check	12s
Test npx fallback (py3.12, windows-latest)	3m 2s
Build Package	12s
Test (py3.13, ubuntu-latest)	1m 34s
Test npx fallback (py3.12, ubuntu-latest)	1m 31s
Test (py3.9, windows-latest)	8m 47s
Test (py3.9, ubuntu-latest)	1m 34s
Test (py3.13, windows-latest)	9m 24s
CI Success	3s
	26m 29s

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