docs: make CLAUDE.md a compatibility shim #123

Job	Run time
Classify Changes	6s
Lint and Format	7s
Type Check (pyright)	12s
Test npx fallback (py3.12, ubuntu-latest)	2m 36s
Test (py3.9, windows-latest)	13m 26s
Test (py3.9, ubuntu-latest)	2m 17s
Test (py3.13, windows-latest)	11m 18s
Type Check (mypy)	13s
Build Package	10s
Test npx fallback (py3.12, windows-latest)	4m 26s
Test (py3.13, ubuntu-latest)	2m 22s
CI Success	3s
	37m 16s

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