test: smoke scripts fail when they stop before their last check

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

tests/Integration/media-admin-smoke.sh

@@ -27,7 +27,7 @@ cleanup() {
   cleanup_app_passwords_for lit-smoke-sub2
   wp user delete lit-smoke-sub2 --yes >/dev/null 2>&1 || true
 }
-trap cleanup EXIT
+trap 'rc=$?; cleanup; guard_exit "$rc" || exit $?' EXIT
 
 connect "$ADMIN_LOGIN"
 
@@ -149,4 +149,4 @@ echo (int) $wpdb->get_var($wpdb->prepare(
 [ "$ROWS" -ge 2 ] || fail "media changes not logged (found $ROWS)"
 pass "media changes logged"
 
-echo "ALL CHECKS PASSED"
+finish