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docs: add Signed commits section to CONTRIBUTING #164

Job	Run time
governance / Security policy checks	4s
governance / Code quality + docs	9s
governance / Allowlist Preflight	8s
governance / Well-Known (RFC 9116 + RSR)	6s
governance / Check Workflow Staleness	8s
governance / Debt ratchet	9s
governance / Language / package anti-pattern policy	11s
governance / Exemption ratchet	6s
governance / Workflow security linter	17s
governance / Guix packaging policy (Nix retired)	5s
governance / Live Actions policy (credentialed advisory)	5s
governance / Licence consistency	5s
governance / Trusted-base reduction policy	7s
governance / Actions lockfile verify	11s
governance / Validate Hypatia Baseline	5s
	1m 56s