docs(readme): note echo types + decidability in the mechanised-proofs… #57

Job	Run time
governance / Language / package anti-pattern policy	8s
governance / Well-Known (RFC 9116 + RSR)	4s
governance / Validate Hypatia baseline	6s
governance / Code quality + docs	22s
governance / Guix primary / Nix fallback policy	3s
governance / Trusted-base reduction policy	7s
governance / Security policy checks	5s
governance / Workflow security linter	4s
governance / Licence consistency	9s
	1m 8s

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