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docs: add Signed commits section to CONTRIBUTING (#75) #109

Job	Run time
governance / Check Workflow Staleness	14s
governance / Code quality + docs	17s
governance / Workflow security linter	9s
governance / Language / package anti-pattern policy	25s
governance / Well-Known (RFC 9116 + RSR)	22s
governance / Licence consistency	12s
governance / Trusted-base reduction policy	17s
governance / Guix primary / Nix fallback policy	19s
governance / Security policy checks	18s
governance / Validate Hypatia Baseline	0s
	2m 33s