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docs: add repository discovery topics (#572) #1278

Job	Run time
governance / Well-Known (RFC 9116 + RSR)	5s
governance / Allowlist Preflight	43s
governance / Code quality + docs	8s
governance / Language / package anti-pattern policy	7s
governance / Check Workflow Staleness	7s
governance / Licence consistency	8s
governance / Security policy checks	7s
governance / Workflow security linter	6s
governance / Live Actions policy (credentialed advisory)	4s
governance / Guix packaging policy (Nix retired)	6s
governance / Actions lockfile verify	6s
governance / Trusted-base reduction policy	8s
governance / Exemption ratchet	0s
governance / Debt ratchet	0s
governance / Validate Hypatia Baseline	31s
	2m 26s