lab1: autoscaler min/max and capacity annotations on lab1-workers (Step 5)

kubectl diff against the live cluster shows only the six annotations.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

configs/capi/lab1.yaml

@@ -15,6 +15,7 @@
 #   4. `vlan: 4` on net0 of both ProxmoxMachineTemplates
 #   5. lab1-worker: 1 socket x 4 cores, 4096 MiB (owner's choice; runbook said 8192)
 #   6. MachineDeployment lab1-workers: `replicas` removed (the autoscaler owns it)
+#   7. MachineDeployment lab1-workers: autoscaler min/max + capacity annotations (runbook Step 5)
 apiVersion: cluster.x-k8s.io/v1beta2
 kind: Cluster
 metadata:
@@ -223,6 +224,14 @@ spec:
 apiVersion: cluster.x-k8s.io/v1beta2
 kind: MachineDeployment
 metadata:
+  annotations:
+    cluster.x-k8s.io/cluster-api-autoscaler-node-group-min-size: "0"
+    cluster.x-k8s.io/cluster-api-autoscaler-node-group-max-size: "5"
+    # scale-from-zero: CAPMOX publishes no status.capacity; must match ProxmoxMachineTemplate/lab1-worker
+    capacity.cluster-autoscaler.kubernetes.io/cpu: "4"                # numSockets 1 × numCores 4
+    capacity.cluster-autoscaler.kubernetes.io/memory: "4Gi"           # memoryMiB 4096
+    capacity.cluster-autoscaler.kubernetes.io/ephemeral-disk: "40Gi"  # bootVolume sizeGb 40
+    capacity.cluster-autoscaler.kubernetes.io/maximum-pods: "110"
   labels:
     cluster.x-k8s.io/cluster-name: lab1
   name: lab1-workers

docs/phase-1-proxmox-capi.md

@@ -159,9 +159,20 @@ metadata:
     capacity.cluster-autoscaler.kubernetes.io/maximum-pods: "110"
 ```
 
+They are part of `MachineDeployment/lab1-workers` in [configs/capi/lab1.yaml](../configs/capi/lab1.yaml);
+re-apply the file (the only diff is these annotations; `replicas` isn't in the manifest, so it
+stays as is):
+
+```bash
+export KUBECONFIG=~/.kube/lab-mgmt.kubeconfig
+kubectl diff -f configs/capi/lab1.yaml       # expect only the six annotations on lab1-workers
+kubectl apply -f configs/capi/lab1.yaml
+```
+
 Capacity annotations are required for scale-from-zero because CAPMOX does not publish
 `status.capacity`. They must match the `ProxmoxMachineTemplate`; add `.../labels` and `.../taints`
-annotations if pods target the group by selector/toleration.
+annotations if pods target the group by selector/toleration. They have no effect until
+cluster-autoscaler runs (Step 6).
 
 ## Step 6 — cluster-autoscaler