Provenance. §1 = reviewed unit (candidate gold, Watson-grounded; inter-annotator agreement is an LLM-panel proxy for human IAA). §§2–3 = candidate (proxy IAA, not human-calibrated). §§4–73 = machine-assisted, unreviewed heuristic exploration. Interpretive layers are valid-but-heuristic rule-sets — coverage ≠ accuracy, not a digital edition. Editorial statement · Error budget