feat(echo-abstraction-barrier): Track B + comparators + Lane 1 close-out updates #176

Job	Run time
governance / Guix primary / Nix fallback policy	38s
governance / Validate Hypatia baseline	30s
governance / Security policy checks	30s
governance / Code quality + docs	30s
governance / Language / package anti-pattern policy	34s
governance / Workflow security linter	43s
governance / Well-Known (RFC 9116 + RSR)	34s
	3m 59s

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