fix: route artifact registry health via remote control plane

scripts/src/remote.ts

@@ -692,6 +692,8 @@ async function remoteArtifactRegistry(session: FrontendSession, args: string[]):
   const command = ["frontend", "/api/dispatch", probe.providerId, "host.ssh", action];
   const result = commandResultFromFrontendTask(command, dispatched.task);
   const registryResult = artifactRegistryReadonlyResultFromCommand(probe, result);
+  const dispatchBody = dispatched.dispatch.body as Record<string, unknown> | null | undefined;
+  const dispatchError = typeof dispatchBody?.error === "string" ? dispatchBody.error : null;
   return {
     transport: "frontend",
     readonly: true,
@@ -706,13 +708,21 @@ async function remoteArtifactRegistry(session: FrontendSession, args: string[]):
         decision: "infra-blocked",
         retryable: true,
         runnerDisposition: "infra-blocked",
+        failureClassification: "control-plane-missing",
+        recommendedAction: "restore the remote frontend/backend-core dispatch control plane, then rerun artifact-registry status|health",
         healthyScopes: [],
-        failedScopes: ["backend-core-api"],
+        failedScopes: ["control-plane-missing", "backend-core-api"],
         runtimeApiHealthy: false,
         channels: [
           { channel: "backend-core-api", ok: false, requiredFor: "frontend /api/dispatch backend-core session creation", detail: dispatched.dispatch },
           { channel: "provider-dispatch", ok: false, requiredFor: "host.ssh task creation", detail: dispatched.dispatch },
         ],
+        controlPlane: {
+          transport: "remote-frontend",
+          failureClassification: "control-plane-missing",
+          dispatchStatus: dispatched.dispatch.status ?? null,
+          dispatchError,
+        },
         registry: registryResult,
       }
       : registryResult,