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docs: add Signed commits section to CONTRIBUTING #124

Job	Run time
governance / Guix packaging policy (Nix retired)	8s
governance / Actions lockfile verify	22s
governance / Live Actions policy (credentialed advisory)	19s
governance / Check Workflow Staleness	8s
governance / Well-Known (RFC 9116 + RSR)	4s
governance / Security policy checks	8s
governance / Allowlist Preflight	29s
governance / Code quality + docs	14s
governance / Licence consistency	7s
governance / Exemption ratchet	7s
governance / Trusted-base reduction policy	21s
governance / Workflow security linter	32s
governance / Language / package anti-pattern policy	19s
governance / Debt ratchet	10s
governance / Validate Hypatia Baseline	10s
	3m 38s