Unset CELERY_WORKER_CONCURRENCY makes oz-celery and nrc-celery fork one
process per CPU — 22 each on the lab node, ~225 MB apiece — and Talos'
OOM controller was killing the runner mid-verify-stack. Same lever as the
uWSGI caps (#144/#145/#147); objecten-celery already defaults to 1.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>