docs(echidnabot): document standalone↔fleet two-purpose split (refs h… #210

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

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