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chore(nix->guix): delete Nix estate-wide (#138) (#183) #284

Job	Run time
governance / Trusted-base reduction policy	7m 18s
governance / Guix primary / Nix fallback policy	7m 18s
governance / Code quality + docs	7m 18s
governance / Security policy checks	7m 18s
governance / Language / package anti-pattern policy	7m 18s
governance / Check Workflow Staleness	7m 18s
governance / Well-Known (RFC 9116 + RSR)	7m 18s
governance / Licence consistency	7m 18s
governance / Workflow security linter	7m 18s
governance / Validate Hypatia Baseline	1s
	1h 5m 43s