fix(deploy): provision management agent during server updates

deploy/update.sh

@@ -124,6 +124,12 @@ else
   git checkout --quiet --detach "$REF"
 fi
 
+# Use the target revision's setup, even when this updater was copied before
+# checkout. Existing deployments must gain new host services during upgrades.
+if [ -f ./install-management.sh ]; then
+  bash ./install-management.sh --ensure
+fi
+
 if [ -n "${PIPU_UPDATE_COMMIT:-}" ]; then
   if [ "$REF" = main ]; then VERSION="main-$(git rev-parse --short HEAD)"; else VERSION="$REF"; fi
 else