Add memory-viewer from silicondawn

- Web UI for browsing and editing OpenClaw memory files
- Cloned from https://github.com/silicondawn/memory-viewer
- Built and running on port 8901
- Features: file tree, markdown rendering, search, live reload
- Full access to MEMORY.md, daily notes, skills, automations

memory-viewer/src/components/AgentStatus.test.tsx

@@ -0,0 +1,42 @@
+import { describe, it, expect } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import { AgentStatusPage } from '../components/AgentStatus';
+import { LocaleContext } from '../hooks/useLocale';
+
+// Mock dependencies
+vi.mock('../api', () => ({
+  fetchAgentStatus: vi.fn().mockResolvedValue({
+    config: { version: '1.2.0', update: { channel: 'stable' } },
+    gateway: { runtime: { status: 'running', pid: 1234 } },
+    heartbeat: { lastRun: Date.now() }
+  })
+}));
+
+// Mock shiki
+vi.mock('shiki', () => ({
+  createHighlighter: vi.fn().mockResolvedValue({
+    codeToHtml: () => '<pre>mock code</pre>'
+  })
+}));
+
+describe('AgentStatusPage', () => {
+  it('renders loading state initially', () => {
+    // We can't easily test loading state with async useEffect, 
+    // but we can test the happy path after wait
+  });
+
+  it('renders status after load', async () => {
+    const mockLocale = { t: (k: string) => k, toggleLocale: () => {}, locale: 'en' as const };
+    
+    render(
+      <LocaleContext.Provider value={mockLocale}>
+        <AgentStatusPage />
+      </LocaleContext.Provider>
+    );
+    
+    // Should eventually show the version
+    expect(await screen.findByText('v1.2.0')).toBeInTheDocument();
+    // Should show gateway running status key
+    expect(screen.getByText('agent.running')).toBeInTheDocument();
+  });
+});