Add k9-ecosystem aggregator hub (staged for extraction) #113

Job	Run time
governance / Guix primary / Nix fallback policy	6s
governance / Workflow security linter	8s
governance / Well-Known (RFC 9116 + RSR)	7s
governance / Language / package anti-pattern policy	10s
governance / Trusted-base reduction policy	13s
governance / Security policy checks	7s
governance / Code quality + docs	23s
governance / Licence consistency	8s
governance / Validate Hypatia baseline	7s
	1m 29s

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