fix: preserve gray preflight diagnostics

scripts/check-gray-ready.sh

@@ -99,6 +99,7 @@ echo "candidate_git_head=${git_head}"
 echo "candidate_memind_head=${memind_head}"
 echo "candidate_image_make_release=${image_make_release_id}"
 
+set +e
 remote_result="$(ssh -o BatchMode=yes -o ConnectTimeout=15 "${HOST}" \
   "GRAY_WEB_PORT='${GRAY_WEB_PORT}' GRAY_API_PORT='${GRAY_API_PORT}' IMAGE_MAKE_RELEASE_ID='${image_make_release_id}' REQUIRE_IMAGE_INTEGRATION='${REQUIRE_IMAGE_INTEGRATION}' /bin/bash" <<'REMOTE'
 set -euo pipefail
@@ -154,6 +155,12 @@ if [[ "${REQUIRE_IMAGE_INTEGRATION}" == "1" ]]; then
 fi
 REMOTE
 )"
+remote_status=$?
+set -e
 
 printf '%s\n' "${remote_result}"
+if [[ "${remote_status}" -ne 0 ]]; then
+  echo "gray_preflight=failed" >&2
+  exit "${remote_status}"
+fi
 echo "gray_preflight=passed"