Completes the ADR-0018 cutover. The stack is emptied to a tombstone so
CI destroys nginx, the NFS content volume, the ingress, the per-site
gdrive-sync CronJob and the namespace; serving + sync are owned by
stacks/valia-sites since the cutover commits. Catalog + runbook updated
to the migrated state (incl. the one-time 42.9→21.4MB video compression
Viktor approved).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
21c6e7112e