🔧 Increase file descriptor limits in Kind cluster

Addresses root cause of Promtail "too many open files" error by
increasing kubelet maxOpenFiles to 1M. This allows Promtail DaemonSet
to watch log files across all namespaces without exhausting file
descriptors.

Changes:
- Added KubeletConfiguration to Kind cluster config
- Set maxOpenFiles: 1000000 (sufficient for large clusters)
- Set maxPods: 110 (kubelet default)

Requires cluster recreation to apply:
  ./scripts/kind/00-cleanup.sh
  ./scripts/kind/01-create-cluster.sh

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: Ladas

scripts/kind/01-create-cluster.sh

@@ -19,7 +19,8 @@ if kind get clusters 2>/dev/null | grep -q "^${CLUSTER_NAME}$"; then
 fi
 
 # Create cluster with port mappings for Istio Gateway
-echo "📦 Creating Kind cluster with Istio port mappings..."
+# File descriptor limits increased for Promtail log collection (requires 1M open files for large clusters)
+echo "📦 Creating Kind cluster with Istio port mappings and increased file limits..."
 cat <<EOF | kind create cluster --name "${CLUSTER_NAME}" --config=-
 kind: Cluster
 apiVersion: kind.x-k8s.io/v1alpha4
@@ -31,6 +32,10 @@ nodes:
     nodeRegistration:
       kubeletExtraArgs:
         node-labels: "ingress-ready=true"
+  - |
+    kind: KubeletConfiguration
+    maxOpenFiles: 1000000
+    maxPods: 110
   extraPortMappings:
   # HTTP - Maps host:8080 to NodePort 30080 (gateway HTTP)
   - containerPort: 30080