RAILIANCE-WP-0016: finish unattended hybrid Option A backups

Core in-cluster CronJobs with cnpg-option-a-backup image + NetworkPolicy;
R01 activity-core schedule enabled; status healthy; evidence recorded.

manifests/cnpg-option-a-netpol.yaml

@@ -0,0 +1,72 @@
+# Allow Option A backup Jobs to reach kube-api, DNS, and HTTPS offsite (Nextcloud).
+# databases/ has default-deny; CNPG cluster pods already have kube-api egress by label.
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: allow-egress-cnpg-option-a-backup
+  namespace: databases
+  labels:
+    app.kubernetes.io/part-of: railiance-apps
+    railiance.apps/backup-lane: option-a
+spec:
+  podSelector:
+    matchLabels:
+      railiance.apps/backup-lane: option-a
+  policyTypes:
+    - Egress
+  egress:
+    # kube-api (in-cluster service + node port forms)
+    - ports:
+        - port: 443
+          protocol: TCP
+        - port: 6443
+          protocol: TCP
+    # DNS
+    - ports:
+        - port: 53
+          protocol: UDP
+        - port: 53
+          protocol: TCP
+    # Nextcloud WebDAV HTTPS (and general HTTPS for future mirrors)
+    - ports:
+        - port: 443
+          protocol: TCP
+      to:
+        - namespaceSelector: {}
+          # allow all namespaces + external via empty podSelector not possible;
+          # for external CIDR use 0.0.0.0/0
+        - ipBlock:
+            cidr: 0.0.0.0/0
+---
+# Some CNI stacks need separate CIDR-only rules for kube-api ClusterIP
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: allow-egress-cnpg-option-a-backup-kubeapi-cidr
+  namespace: databases
+  labels:
+    app.kubernetes.io/part-of: railiance-apps
+    railiance.apps/backup-lane: option-a
+spec:
+  podSelector:
+    matchLabels:
+      railiance.apps/backup-lane: option-a
+  policyTypes:
+    - Egress
+  egress:
+    - to:
+        - ipBlock:
+            cidr: 10.43.0.0/16
+      ports:
+        - port: 443
+          protocol: TCP
+        - port: 6443
+          protocol: TCP
+    - to:
+        - ipBlock:
+            cidr: 10.42.0.0/16
+      ports:
+        - port: 443
+          protocol: TCP
+        - port: 6443
+          protocol: TCP