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docs: add Signed commits section to CONTRIBUTING (#126) #185

Job	Run time
governance / Guix primary / Nix fallback policy	7s
governance / Licence consistency	8s
governance / Code quality + docs	8s
governance / Trusted-base reduction policy	5s
governance / Well-Known (RFC 9116 + RSR)	5s
governance / Security policy checks	4s
governance / Workflow security linter	6s
governance / Language / package anti-pattern policy	11s
governance / Check Workflow Staleness	10s
governance / Validate Hypatia Baseline	0s
	1m 4s