The DR test script used set -euo pipefail, so a failing SSH
shutdown command caused the script to exit before qm stop.
On 2026-04-20 this left VM 109 running for 2.5 days and
triggered an OOM cascade when pvemini HA-failed over to
pveelite.
Adds EXIT trap that force-stops VM 109 regardless of exit
path, and makes the Step 7 SSH shutdown tolerant of failure.
Incident details: proxmox/cluster/incidents/2026-04-20-cluster-outage.md
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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