Add Trivy integration to noble cluster setup, including namespace and application configurations. Update README and playbook tags to reflect new security scanning capabilities. Enhance Longhorn and kube-prometheus-stack deployment reliability with increased timeout settings and retry mechanisms.

clusters/noble/bootstrap/trivy/namespace.yaml

@@ -0,0 +1,10 @@
+# Trivy Operator — apply before Helm (Ansible **noble_trivy**).
+# Scan jobs may use elevated capabilities; align with other operator namespaces.
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: trivy-system
+  labels:
+    pod-security.kubernetes.io/enforce: privileged
+    pod-security.kubernetes.io/audit: privileged
+    pod-security.kubernetes.io/warn: privileged