Harden RC9 UX and performance states

scripts/run_rc9_ux_audit.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+cd "$ROOT"
+
+BASE_URL="${1:-${GE_INTEL_BASE_URL:-http://127.0.0.1:1202}}"
+OUTPUT_DIR="${2:-artifacts/rc9-ux-audit}"
+
+if ! command -v npm >/dev/null 2>&1; then
+  echo "Node.js/npm is required to execute the RC9 UX audit." >&2
+  exit 2
+fi
+
+npm --prefix frontend run test:e2e:ux -- \
+  --base-url "$BASE_URL" \
+  --output "../$OUTPUT_DIR"