Reference to the upstream Feature Pipeline that persisted these features.
Stable id for this step, referenced by downstream steps' Inputs.
OptionalInputsIds of upstream steps that feed this step (DAG edges).
Discriminator selecting the concrete step variant.
OptionalLabelOptional human-readable label for the visual DAG.
llm-derived— features produced by an upstream Feature Pipeline (plan §5.3 / §5.4). LLM-synthesized features are persisted and version-pinned, not recomputed inline, to preserve determinism and avoid train/serve skew (§6.5).