feat(stdlib): ESC-03 — Dict/Map keyed container (stdlib/dict.affine) #196

Job	Run time
governance / Language / package anti-pattern policy	4s
governance / Workflow security linter	6s
governance / Guix primary / Nix fallback policy	6s
governance / Well-Known (RFC 9116 + RSR)	7s
governance / Security policy checks	4s
governance / Code quality + docs	11s
	38s

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