Member Junction
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    FeatureStepKind:
        | "select"
        | "impute"
        | "standardize"
        | "onehot"
        | "bin"
        | "embedding"
        | "llm-derived"
        | "flow-agent"
        | "vision-llm"

    The set of step kinds supported by the FeatureAssembly executor. Each maps to a concrete FeatureStep variant below.