feat: bounded-search-is-decidable — EchoSearch decidability bridge #471

Job	Run time
governance / Well-Known (RFC 9116 + RSR)	3s
governance / Language / package anti-pattern policy	7s
governance / Licence consistency	5s
governance / Guix primary / Nix fallback policy	4s
governance / Code quality + docs	9s
governance / Validate Hypatia baseline	3s
governance / Trusted-base reduction policy	7s
governance / Workflow security linter	4s
governance / Security policy checks	5s
	47s

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