Semantic search over the case-law corpus

Vector search (voyage-law-2) over the Nexus indexed case-law corpus. The corpus grows incrementally — coverage by jurisdiction, source, up-to-date counts and date range in GET /api/v1/corpus/coverage (not hardcoded in this description, to keep it from going stale). Current coverage includes judgments and doctrine from courts and regulators in ES, EU, INT, CO, KR and other jurisdictions per the coverage table. Returns top-K results with title, source, excerpt (2,000 chars) and permanent URL. SCOPE: this is a CASE-LAW corpus — rulings by high courts that create doctrine and precedent — NOT an exhaustive database of every judgment handed down in each country; rulings that do not set case law are out of scope by design.