Disable timer heartbeats by default for new agents

ui/src/components/AgentConfigForm.tsx

@@ -923,14 +923,14 @@ export function AgentConfigForm(props: AgentConfigFormProps) {
               <ToggleWithNumber
                 label="Heartbeat on interval"
                 hint={help.heartbeatInterval}
-                checked={eff("heartbeat", "enabled", heartbeat.enabled !== false)}
+                checked={eff("heartbeat", "enabled", heartbeat.enabled === true)}
                 onCheckedChange={(v) => mark("heartbeat", "enabled", v)}
                 number={eff("heartbeat", "intervalSec", Number(heartbeat.intervalSec ?? 300))}
                 onNumberChange={(v) => mark("heartbeat", "intervalSec", v)}
                 numberLabel="sec"
                 numberPrefix="Run heartbeat every"
                 numberHint={help.intervalSec}
-                showNumber={eff("heartbeat", "enabled", heartbeat.enabled !== false)}
+                showNumber={eff("heartbeat", "enabled", heartbeat.enabled === true)}
               />
             </div>
             <CollapsibleSection

ui/src/components/OnboardingWizard.tsx

@@ -33,6 +33,7 @@ import {
   buildOnboardingProjectPayload,
   selectDefaultCompanyGoalId
 } from "../lib/onboarding-launch";
+import { buildNewAgentRuntimeConfig } from "../lib/new-agent-runtime-config";
 import {
   DEFAULT_CODEX_LOCAL_BYPASS_APPROVALS_AND_SANDBOX,
   DEFAULT_CODEX_LOCAL_MODEL
@@ -460,15 +461,7 @@ export function OnboardingWizard() {
         role: "ceo",
         adapterType,
         adapterConfig: buildAdapterConfig(),
-        runtimeConfig: {
-          heartbeat: {
-            enabled: true,
-            intervalSec: 3600,
-            wakeOnDemand: true,
-            cooldownSec: 10,
-            maxConcurrentRuns: 1
-          }
-        }
+        runtimeConfig: buildNewAgentRuntimeConfig()
       });
       setCreatedAgentId(agent.id);
       queryClient.invalidateQueries({