fix: avoid update failure on /opt/sk cwd

scripts/update_client.sh

@@ -87,6 +87,14 @@ cleanup() {
 }
 trap cleanup EXIT
 
+error_exit() {
+  local msg="${1:-update failed}"
+  SKD_VERSION="${VERSION:-unknown}" SKD_STATUS="failed" SKD_ERROR="${msg}" \
+    SKD_TIMESTAMP="$(date -u '+%Y-%m-%dT%H:%M:%SZ')" SKD_STATUS_FILE="${STATUS_FILE}" \
+    SKD_LOG_FILE="${LOG_FILE}" report_status "failed" "${msg}"
+}
+trap 'error_exit "update failed at line ${LINENO}"' ERR
+
 require_cmd() {
   if ! command -v "$1" >/dev/null 2>&1; then
     echo "Required command not found: $1" >&2