docs: seed CHANGELOG.md (Keep-a-Changelog format) (#9) #11

Job	Run time
governance / Guix primary / Nix fallback policy	5s
governance / Validate Hypatia baseline	3s
governance / Code quality + docs	9s
governance / Security policy checks	4s
governance / Language / package anti-pattern policy	41s
governance / Trusted-base reduction policy	6s
governance / Well-Known (RFC 9116 + RSR)	3s
governance / Workflow security linter	6s
	1m 17s

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