docs: add Signed commits section to CONTRIBUTING #394

Job	Run time
governance / Check Workflow Staleness	6s
governance / Debt ratchet	10s
governance / Guix packaging policy (Nix retired)	8s
governance / Well-Known (RFC 9116 + RSR)	4s
governance / Live Actions policy (credentialed advisory)	4s
governance / Security policy checks	7s
governance / Code quality + docs	9s
governance / Allowlist Preflight	6s
governance / Language / package anti-pattern policy	10s
governance / Actions lockfile verify	6s
governance / Licence consistency	5s
governance / Exemption ratchet	9s
governance / Trusted-base reduction policy	6s
governance / Workflow security linter	8s
governance / Validate Hypatia Baseline	4s
	1m 42s

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