fix(ops): retry cold-start HTTP probes

scripts/reboot-recovery/full-stack-cold-start-check.sh

@@ -82,8 +82,15 @@ ssh_cmd() {
 
 probe_http_code() {
   local url="$1"
-  local code
-  code=$(curl -s -o /dev/null -w "%{http_code}" --max-time 5 "$url" 2>/dev/null || true)
+  local attempt code
+  for attempt in 1 2; do
+    code=$(curl -s -o /dev/null -w "%{http_code}" --max-time 12 "$url" 2>/dev/null || true)
+    if [[ "$code" =~ ^[0-9]{3}$ ]] && [ "$code" != "000" ]; then
+      echo "$code"
+      return
+    fi
+    sleep 1
+  done
   echo "${code:-000}"
 }