Precheck failed; no files were copied.
Summary: rows checked=1, samples checked=1, source objects checked=2, concordance directories checked=1.
Blockers:
- row 2; SAMPLE_ID=HG002; RUN_ID=JEMILMN0P1
  - field=EXTERNAL_SAMPLE_ID: Positive GIAB controls require EXTERNAL_SAMPLE_ID for truth file lookup.
