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docs: add Signed commits section to CONTRIBUTING #163

Job	Run time
governance / Check Workflow Staleness	8s
governance / Well-Known (RFC 9116 + RSR)	5s
governance / Licence consistency	7s
governance / Workflow security linter	5s
governance / Security policy checks	6s
governance / Trusted-base reduction policy	9s
governance / Language / package anti-pattern policy	14s
governance / Guix primary / Nix fallback policy	8s
governance / Code quality + docs	6s
governance / Validate Hypatia Baseline	0s
	1m 8s