When rerun_mode=True and rerun_source='original_progress', restrict the
shuffled combo list to hashes present in the original combo_progress.json
before iteration. Lets the backfill rerun replay exactly the combos that
were processed originally, ignoring any LoRAs added since and any combos
that were never run.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>