fix(deploy): blackbox-exporter was gated out of its own deploy path

PR #69 wired the copier, planner entry and health gate but missed the
three dispatch gates: the client valid_service, the remote
service_is_allowed, and deploy_service's case list. The client gate
rejected --service blackbox-exporter outright; even past it the
dispatcher's catch-all hard-fails on dankclaw (no compose since
2026-09-16). New seam pins the class: every dankclaw service the
remote gate allows must carry a deploy_service case - proven red by
planting a gated, undispatched name.

scripts/deploy.sh

@@ -140,7 +140,7 @@ valid_service() {
         dankclaw:gitea-server|dankclaw:homepage|\
         dankclaw:comfyui|dankclaw:hermes|dankclaw:hermes-dashboard|\
         dankclaw:hermes-webui|dankclaw:prometheus|dankclaw:grafana|dankclaw:loki|dankclaw:alloy|\
-        dankclaw:alertmanager|\
+        dankclaw:alertmanager|dankclaw:blackbox-exporter|\
         dankclaw:node-exporter|dankclaw:cadvisor|dankclaw:gpu-exporter|dankclaw:authentik-postgres|dankclaw:authentik-server|\
         dankclaw:authentik-worker|dankclaw:authentik-outpost|dankclaw:authentik-outpost-ldap|dankclaw:anubis|dankclaw:seerr|\
         dankclaw:open-notebook|\