Fact-check or substantiate a claim against the corpus. Given a textual claim, retrieves and CLASSIFIES evidence into supporting / contradicting / neutral groups. Uses HyDE (hypothetical document expansion) — server generates plausible supporting/contradicting text, embeds, retrieves, then ranks by relation to original claim. Returns chunks with selfContained flag (safe-to-cite indicator). Use for fact-verification, controversy mapping, 'is this claim known?' queries. Modes: 'fast' (~3s, symmetric-by-construction grouping) / 'deep' (~10s, independent NLI classification). IMPORTANT: in 'fast' mode the supporting/contradicting counts are approximately balanced BY CONSTRUCTION and do NOT reflect actual literature distribution. Use 'deep' when measuring controversy balance, literature distribution, or any claim of the form 'the field is split N:M on this'.
Connector