Fix zone provisioning: seed glue + IP primaries

Two bugs made every provisioned zone fail to load:

1. The seed zone's apex NS (ns1.<zone>) is in-zone but had no address
   record, so BIND check-integrity refused to load it and rndc addzone
   reverted. Add a glue A record pointing at the primary pod IP.
2. Secondaries rendered primaries/default-primaries with the primary's
   DNS name, but BIND only accepts IP addresses there (it read the name
   as a remote-servers list and failed config load, crash-looping the
   secondary). Render the primary pod IP instead, and watch Pods so the
   config re-renders when that IP appears or changes.

- bind.WriteSeedZone writes 'ns1 IN A <primaryIP>' glue
- controllers resolve primaryPodIP and pass it to the seed (requeue if
  the primary has no IP yet)
- BindCluster renders PrimaryAddress from pod-0's IP and watches Pods
- render omits catalog primaries when the IP is unknown (no empty list)

internal/controller/bindcluster_controller.go

@@ -160,7 +160,10 @@ func (r *BindClusterReconciler) reconcileKeysSecret(ctx context.Context, c *bind
 }
 
 func (r *BindClusterReconciler) reconcileConfigMap(ctx context.Context, c *bindv1alpha1.BindCluster) error {
-	in := bind.RenderInput{Cluster: c, PrimaryAddress: primaryAddress(c.Name, c.Namespace)}
+	// BIND primaries/default-primaries need the primary's IP address, not a DNS
+	// name, so render with pod-0's current IP (empty until it is scheduled; the
+	// Pod watch re-renders when it appears or changes).
+	in := bind.RenderInput{Cluster: c, PrimaryAddress: primaryPodIP(ctx, r.Client, c)}
 
 	var acls bindv1alpha1.BindACLList
 	if err := r.List(ctx, &acls, client.InNamespace(c.Namespace)); err == nil {
@@ -387,6 +390,12 @@ func (r *BindClusterReconciler) SetupWithManager(mgr ctrl.Manager) error {
 		Owns(&corev1.Service{}).
 		Owns(&corev1.ConfigMap{}).
 		Owns(&corev1.Secret{}).
+		Watches(&corev1.Pod{}, handler.EnqueueRequestsFromMapFunc(func(ctx context.Context, o client.Object) []reconcile.Request {
+			// Re-render named.conf when a cluster pod's IP appears or changes, so
+			// secondaries always point primaries/default-primaries at the current
+			// primary pod IP.
+			return mapToCluster(o.GetLabels()[clusterLabel], o.GetNamespace())
+		})).
 		Watches(&bindv1alpha1.BindACL{}, handler.EnqueueRequestsFromMapFunc(func(ctx context.Context, o client.Object) []reconcile.Request {
 			return mapToCluster(o.(*bindv1alpha1.BindACL).Spec.ClusterRef, o.GetNamespace())
 		})).