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Annotate each derived fact with (rule_id, min_height) inside the fixpoint and reconstruct one shortest proof on demand at ::why time by backward-chaining against the live session. Every body step is covered: Scan/Join add premises, filters and column extensions replay through the same per-row helpers the dataflow uses, negated atoms render as absent-leaves, and aggregates are leaves. --provenance now gives Engine a live lazy session that follows fact deltas; adding a rule rebuilds it. The eager ProofEdge strategy lives on the dd-provenance branch for comparison. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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