infra: add populate-test-data job and refresh script

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/refresh-test-data.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+# Re-populate the test-data-pvc from training-data-pvc.
+# Usage: ./scripts/refresh-test-data.sh
+set -euo pipefail
+
+echo "Submitting populate-test-data job..."
+kubectl -n foxhunt create -f infra/k8s/training/populate-test-data-job.yaml
+
+echo "Waiting for completion..."
+kubectl -n foxhunt wait --for=condition=complete job \
+  -l app.kubernetes.io/name=populate-test-data \
+  --timeout=300s
+
+echo "Done. Test data PVC refreshed."