feat(ollama): enable prune, guarded by Prune=false on the models PVC

Last app without prune; now consistent with the rest of the cluster.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

argocd/application-ollama.yaml

@@ -14,6 +14,7 @@ spec:
     targetRevision: HEAD
   syncPolicy:
     automated:
+      prune: true
       selfHeal: true
     syncOptions:
     - CreateNamespace=true

ollama/ollama.yaml

@@ -8,6 +8,9 @@ metadata:
 apiVersion: v1
 kind: PersistentVolumeClaim
 metadata:
+  annotations:
+    # Never let ArgoCD prune this PVC: it holds the downloaded models (20Gi).
+    argocd.argoproj.io/sync-options: Prune=false
   name: ollama-models
   namespace: ollama
 spec: