RAILIANCE-WP-0012/0013/0014: Core Hub S5 release, CNPG observability, and follow-up workplans

Deliver the inbox-suggestion implementation from WP-0012: Core Hub Helm chart
and Makefile targets, CNPG backup status tooling, and updated backup handoff
docs. Archive the finished WP-0012 workplan and register ready follow-ups
WP-0013 (CNPG backup wiring + restore drill) and WP-0014 (Core Hub Helm
cutover and vergabe-teilnahme image refresh).

charts/core-hub/templates/ingress.yaml

@@ -0,0 +1,28 @@
+{{- if .Values.ingress.enabled }}
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: core-hub
+  labels: {{- include "corehub.labels" . | nindent 4 }}
+  annotations:
+    {{- toYaml .Values.ingress.annotations | nindent 4 }}
+spec:
+  ingressClassName: {{ .Values.ingress.className }}
+  {{- if .Values.ingress.tls }}
+  tls:
+    - hosts:
+        - {{ .Values.ingress.host }}
+      secretName: core-hub-tls
+  {{- end }}
+  rules:
+    - host: {{ .Values.ingress.host }}
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: {{ include "corehub.fullname" . }}
+                port:
+                  number: {{ .Values.service.port }}
+{{- end }}