feat(codegen): #234 S4 — retire hardcoded async_primitives (ADR-016 complete) #206

Job	Run time
governance / Language / package anti-pattern policy	7s
governance / Security policy checks	6s
governance / Well-Known (RFC 9116 + RSR)	7s
governance / Code quality + docs	10s
governance / Guix primary / Nix fallback policy	5s
governance / Workflow security linter	4s
	39s

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