fix(workbench): suppress unconfigured demo alerts

The not_configured branch previously promoted mock task failures into critical alerts. Return an explicit empty alert source so the exception badge reflects only actionable backend state.

src/features/workbench/hooks/use-workbench-runtime-data.ts

@@ -11,7 +11,6 @@ import {
 } from "../data/scheduled-conditions";
 import { WORKBENCH_SCENARIOS } from "../data/workbench-session";
 import type { ScheduledConditionItem } from "../types";
-import { createScheduledConditionAlerts } from "../utils/scheduled-condition-alerts";
 import type { WorkbenchSyncState } from "./use-workbench-sync";
 
 const HEADER_DATA_TIME_STEP_MINUTES = 5;
@@ -106,8 +105,8 @@ export function resolveWorkbenchRuntimeData(
     scheduledConditions: [...fallbackConditions, ...resolvedWorkOrders],
     workbenchAlerts: backendAlertsConfigured
       ? backendSnapshot!.alerts
-      : createScheduledConditionAlerts(fallbackConditions),
-    alertDataSource: backendAlertsConfigured ? "backend" as const : "mock" as const,
+      : [],
+    alertDataSource: backendAlertsConfigured ? "backend" as const : "none" as const,
     runtimeDataSource: "mock" as const,
     scenarios: useBackendScenarios ? backendSnapshot!.scenarios : WORKBENCH_SCENARIOS,
     scenarioDataSource: useBackendScenarios ? "analysis_runs" as const : "mock" as const,