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Refactor README into Supabase/Vercel CLI house style #118

Job	Run time
build + twine check	13s
pre-commit	1m 30s
pip-audit (dependency CVEs)	25s
install.sh real install (macos-latest)	42s
install.sh real install (ubuntu-latest)	1m 15s
lint + typecheck + tests	2m 3s
	6m 8s