8 GET endpoints under /api/v1 for health, personas, cases, vector search,
juror context, and hybrid search. Includes QueryService composing SubgraphQuery
+ VectorIndex + GraphDB, Pydantic response models, error handlers, and
`serve` CLI mode via uvicorn. 20 new tests, 190 total, zero regressions.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>