fix: harden cluster rebuild determinism

terraform/outputs.tf

@@ -62,3 +62,18 @@ output "kube_api_lb_ip" {
   description = "Load Balancer private IP for Kubernetes API (used for cluster joins)"
   value       = var.kube_api_vip
 }
+
+output "proxmox_target_vms" {
+  description = "Proxmox VM targets managed by Terraform, used by rebuild cleanup checks"
+  value = [
+    for name, node in local.nodes : {
+      name               = name
+      vm_id              = node.vm_id
+      role               = node.role
+      node_name          = var.proxmox_node_name
+      cloud_init_storage = var.proxmox_cloud_init_storage_pool
+      tags               = ["terraform", var.cluster_name, node.role]
+      description        = "Managed by Terraform for ${var.cluster_name}"
+    }
+  ]
+}