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Code-gen

CodeGenBuilder refines BuilderSpec with generator and languages so multi-language generators (protoc, openapi-generator, graphql-codegen) carry their target metadata in the type.

The codeGen smart constructor expands a single config record into a fully-typed spec: per-language outputs, read-source / declare-tool / resolve-dependency / run-tool / transform-output / emit-descriptor / materialize-derivation operations.

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