feat: make kubeadm workflows auto-scale with terraform outputs

nixos/kubeadm/README.md

@@ -99,7 +99,7 @@ cp ./scripts/inventory.example.env ./scripts/inventory.env
 $EDITOR ./scripts/inventory.env
 ```
 
-2. Rebuild all nodes and bootstrap cluster:
+2. Rebuild all nodes and bootstrap/reconcile cluster:
 
 ```bash
 ./scripts/rebuild-and-bootstrap.sh
@@ -115,6 +115,9 @@ For a full nuke/recreate lifecycle:
 - run Terraform destroy/apply for VMs first,
 - then run `./scripts/rebuild-and-bootstrap.sh` again.
 
+Node lists are discovered from Terraform outputs, so adding new workers/control
+planes in Terraform is picked up automatically by the bootstrap/reconcile flow.
+
 ## Optional Gitea workflow automation
 
 Primary flow: