Harden RC9 UX and performance states

scripts/run_readiness_check.sh

@@ -127,6 +127,7 @@ ${PYTHON_BIN} -m compileall backend/app
 (cd frontend && npm run typecheck)
 (cd frontend && npm run build)
 "${NODE_BIN}" --check frontend/e2e/releaseJourneys.mjs
+"${NODE_BIN}" --check frontend/e2e/uxAudit.mjs
 bash -n scripts/live_migration_smoke.sh
 bash -n scripts/deploy_tower.sh
 bash -n scripts/verify_release_fresh_install.sh
@@ -160,4 +161,5 @@ bash -n scripts/verify_golden_qa_benchmark.sh
 bash -n scripts/verify_demo_cleanup_dry_run.sh
 bash -n scripts/capture_workbench_screenshots.sh
 bash -n scripts/run_rc8_release_journeys.sh
+bash -n scripts/run_rc9_ux_audit.sh
 echo "== Run readiness check passed =="