Check #47 "Proxmox CSI — Ghost-Disk Drift": per node, compares the real
virtio-scsi CSI disk count in `qm config <vmid>` (SSH PVE) against the
attached proxmox-CSI VolumeAttachments k8s tracks. Catches orphaned "ghost"
disks left by failed detaches (query-pci QMP timeouts) that the scheduler's
28-LUN guard can't see — exactly the drift that wedged the MAM grabber on
node3 (13 tracked vs 23 real). PASS reconciled; WARN drift>0 or real 20-24;
FAIL real ≥25 (near the LUN cap). Already flagging node6 at 21 disks.
Single `qm list` + one `qm config` per VM keeps it ~3s (the naive
once-per-VM version timed out the parallel runner).
Also fixes a PRE-EXISTING set -e crash in #46 immich_search (introduced by
138894cd): `pct=$(kubectl exec … | tr -d ' ')` and the dur_ms probe were
unguarded, so with `set -o pipefail` a non-zero psql/exec propagated and
tripped `set -e`, killing the check before json_add. It silently dropped
from every parallel report and broke --serial entirely (whole run aborted).
Guarded both substitutions with `|| true`; the existing `=~` numeric checks
already handle the empty case. immich_search now reports PASS/WARN instead
of vanishing.
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