docs: make CLAUDE.md a compatibility shim #121

Job	Run time
Classify Changes	5s
Build Package	8s
Type Check (pyright)	12s
Lint and Format	11s
Type Check (mypy)	13s
Test (py3.9, windows-latest)	10m 16s
Test (py3.13, ubuntu-latest)	2m 17s
Test npx fallback (py3.12, windows-latest)	4m 18s
Test (py3.9, ubuntu-latest)	2m 14s
Test (py3.13, windows-latest)	16m 7s
Test npx fallback (py3.12, ubuntu-latest)	2m 42s
CI Success	3s
	38m 46s

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