a0388cf4e1
- DuckDB persistence: gnomad_constraint table with CREATE OR REPLACE (idempotent) - CLI evidence command: usher-pipeline evidence gnomad with checkpoint-restart - Provenance tracking: records processing steps, saves sidecar JSON - Query helpers: query_constrained_genes validates GCON-03 interpretation - 12 integration tests: end-to-end pipeline, checkpoint, provenance, CLI - Phase 2 complete: Evidence layer pattern established for future sources - Duration: 4 min, 2 tasks, 5 files, 70 tests passing Phase 2 (Prototype Evidence Layer) complete.