fix(frontend): hide stale agent prompts in demo mode

docs/release-control/v6/internal/subsystems/frontend-primitives.md

@@ -2462,6 +2462,11 @@ payload, but the browser-owned shared primitive is now the resolved
 monitored-system warning banners, dashboard upsells, Patrol upgrade CTAs,
 history-lock paywalls, and other public-demo commercial affordances when the
 browser is rendering a public demo runtime.
+Platform stale-agent notices are also command-style upgrade affordances:
+`frontend-modern/src/features/platformPage/PlatformOutdatedAgentNotice.tsx`
+must stay hidden while the resolved presentation policy marks the session
+read-only, including public demo mode, even though the same notice remains
+available for ordinary customer installs that report outdated agents.
 That same shared settings-shell boundary also owns demo-mode organization
 suppression. `frontend-modern/src/components/Settings/settingsNavigationModel.ts`,
 `frontend-modern/src/components/Settings/settingsNavCatalog.ts`,

frontend-modern/src/components/shared/SharedPrimitives.guardrails.test.ts

@@ -4833,6 +4833,12 @@ describe('shared primitive guardrails', () => {
       expect(source).not.toContain('rounded-lg border border-amber-300 bg-amber-50');
       expect(source).not.toContain('text-amber-900 underline-offset-2');
     }
+    expect(platformOutdatedAgentNoticeSource).toContain(
+      "import { presentationPolicyIsReadOnly } from '@/stores/sessionPresentationPolicy';",
+    );
+    expect(platformOutdatedAgentNoticeSource).toContain(
+      'const visible = createMemo(() => count() > 0 && !presentationPolicyIsReadOnly());',
+    );
   });
 
   it('routes dismissible demo notices through InlineNotice banner primitives', () => {

frontend-modern/src/features/platformPage/PlatformOutdatedAgentNotice.test.tsx

@@ -1,9 +1,11 @@
 import { cleanup, render, screen } from '@solidjs/testing-library';
 import { afterEach, describe, expect, it } from 'vitest';
+import { syncSessionPresentationPolicy } from '@/stores/sessionPresentationPolicy';
 import { PlatformOutdatedAgentNotice } from './PlatformOutdatedAgentNotice';
 
 afterEach(() => {
   cleanup();
+  syncSessionPresentationPolicy(null);
 });
 
 describe('PlatformOutdatedAgentNotice', () => {
@@ -65,6 +67,31 @@ describe('PlatformOutdatedAgentNotice', () => {
     );
   });
 
+  it('hides agent upgrade commands when the session presentation policy hides upgrade prompts', () => {
+    syncSessionPresentationPolicy({
+      presentationPolicy: {
+        demoMode: true,
+        readOnly: true,
+        hideCommercial: true,
+        hideUpgrade: true,
+      },
+    });
+
+    render(() => (
+      <PlatformOutdatedAgentNotice
+        hosts={[{ name: 'West Production A', version: 'v5.1.34' }]}
+        targetVersion="v6.0.0-rc.7"
+        missingLabel="agent-contributed Proxmox node detail and command support"
+        copyVariant="latest-detail"
+        actionHref="/settings/infrastructure?agentUpdates=1"
+        actionLabel="Open agent upgrade commands"
+      />
+    ));
+
+    expect(screen.queryByTestId('platform-outdated-agent-notice')).not.toBeInTheDocument();
+    expect(screen.queryByRole('link', { name: 'Open agent upgrade commands' })).toBeNull();
+  });
+
   it('can describe stale in-guest agents on VMs without host copy', () => {
     render(() => (
       <PlatformOutdatedAgentNotice

frontend-modern/src/features/platformPage/PlatformOutdatedAgentNotice.tsx

@@ -1,6 +1,7 @@
 import { Show, createMemo } from 'solid-js';
 import { AlertTriangle, ArrowRight } from 'lucide-solid';
 import { InlineNotice } from '@/components/shared/InlineNotice';
+import { presentationPolicyIsReadOnly } from '@/stores/sessionPresentationPolicy';
 import type { OutdatedAgentHost } from './agentVersion';
 
 type PlatformOutdatedAgentNoticeProps = {
@@ -31,6 +32,7 @@ export function PlatformOutdatedAgentNotice(props: PlatformOutdatedAgentNoticePr
   const actionLabel = createMemo(() => props.actionLabel || 'Open Infrastructure settings');
   const subjectSingular = createMemo(() => props.subjectSingular || 'host');
   const subjectPlural = createMemo(() => props.subjectPlural || 'hosts');
+  const visible = createMemo(() => count() > 0 && !presentationPolicyIsReadOnly());
 
   const message = createMemo(() => {
     const target = props.targetVersion ? ` to ${props.targetVersion}` : '';
@@ -49,7 +51,7 @@ export function PlatformOutdatedAgentNotice(props: PlatformOutdatedAgentNoticePr
   });
 
   return (
-    <Show when={count() > 0}>
+    <Show when={visible()}>
       <InlineNotice
         role="status"
         data-testid="platform-outdated-agent-notice"