core: quarantine titan-08 runtime storage stalls

infrastructure/core/node-maintenance.yaml

@@ -3,6 +3,21 @@
 # Existing workloads and storage DaemonSets are not drained by these resources.
 apiVersion: v1
 kind: Node
+metadata:
+  name: titan-08
+  labels:
+    hardware: rpi5
+    node-role.kubernetes.io/worker: "true"
+    longhorn-host: "true"
+  annotations:
+    kustomize.toolkit.fluxcd.io/ssa: Merge
+    kustomize.toolkit.fluxcd.io/prune: disabled
+    atlas.bstein.dev/maintenance-reason: "Runtime USB disk reaches sustained saturation during image builds; repair media and verify loaded I/O before uncordoning."
+spec:
+  unschedulable: true
+---
+apiVersion: v1
+kind: Node
 metadata:
   name: titan-14
   labels: