Add test automation script scaffolds

scripts/perf_smoke.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "$0")/.." && pwd)"
+APP_DIR="$ROOT_DIR/app"
+
+if [ ! -d "$APP_DIR" ]; then
+  echo "app directory does not exist: $APP_DIR" >&2
+  exit 1
+fi
+
+echo "perf smoke scaffold"
+echo "- app directory: $APP_DIR"
+echo "- dart files: $(find "$APP_DIR/lib" -name '*.dart' | wc -l)"
+echo "- test files: $(find "$APP_DIR/test" -name '*.dart' | wc -l)"
+echo "No runtime performance probe is implemented yet."