docs: point groove CLI install hint at hyperpolymath/groove-protocol #170

Job	Run time
governance / Licence consistency	6s
governance / Trusted-base reduction policy	10s
governance / Guix primary / Nix fallback policy	4s
governance / Validate Hypatia baseline	5s
governance / Workflow security linter	8s
governance / Security policy checks	5s
governance / Code quality + docs	27s
governance / Language / package anti-pattern policy	8s
governance / Well-Known (RFC 9116 + RSR)	4s
	1m 17s

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