feat: add Discuss and Explore subagents for dynamic critique and code exploration

- Implement Discuss Subagent for multi-perspective critique with dynamic perspectives.
- Create Explore Subagent for shared codebase exploration with centralized caching.
- Add tests for CcwToolsMcpCard component to ensure enabled tools are preserved on config save.
- Introduce SessionPreviewPanel component for previewing and selecting sessions for Memory V2 extraction.
- Develop CommandCreateDialog component for creating/importing commands with import and CLI generate modes.

ccw/frontend/src/components/mcp/CcwToolsMcpCard.test.tsx

@@ -0,0 +1,102 @@
+// ========================================
+// CcwToolsMcpCard Component Tests
+// ========================================
+
+import { describe, it, expect, beforeEach, vi } from 'vitest';
+import { render, screen, waitFor } from '@/test/i18n';
+import userEvent from '@testing-library/user-event';
+
+import { CcwToolsMcpCard } from './CcwToolsMcpCard';
+import { updateCcwConfig, updateCcwConfigForCodex } from '@/lib/api';
+
+vi.mock('@/lib/api', () => ({
+  installCcwMcp: vi.fn(),
+  uninstallCcwMcp: vi.fn(),
+  updateCcwConfig: vi.fn(),
+  installCcwMcpToCodex: vi.fn(),
+  uninstallCcwMcpFromCodex: vi.fn(),
+  updateCcwConfigForCodex: vi.fn(),
+}));
+
+vi.mock('@/hooks/useNotifications', () => ({
+  useNotifications: () => ({
+    success: vi.fn(),
+    error: vi.fn(),
+  }),
+}));
+
+describe('CcwToolsMcpCard', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it('preserves enabledTools when saving config (Codex)', async () => {
+    const updateCodexMock = vi.mocked(updateCcwConfigForCodex);
+    updateCodexMock.mockResolvedValue({
+      isInstalled: true,
+      enabledTools: [],
+      installedScopes: ['global'],
+    });
+
+    render(
+      <CcwToolsMcpCard
+        target="codex"
+        isInstalled={true}
+        enabledTools={['write_file', 'read_many_files']}
+        onToggleTool={vi.fn()}
+        onUpdateConfig={vi.fn()}
+        onInstall={vi.fn()}
+      />,
+      { locale: 'en' }
+    );
+
+    const user = userEvent.setup();
+    await user.click(screen.getByText(/CCW MCP Server|mcp\.ccw\.title/i));
+    await user.click(
+      screen.getByRole('button', { name: /Save Configuration|mcp\.ccw\.actions\.saveConfig/i })
+    );
+
+    await waitFor(() => {
+      expect(updateCodexMock).toHaveBeenCalledWith(
+        expect.objectContaining({
+          enabledTools: ['write_file', 'read_many_files'],
+        })
+      );
+    });
+  });
+
+  it('preserves enabledTools when saving config (Claude)', async () => {
+    const updateClaudeMock = vi.mocked(updateCcwConfig);
+    updateClaudeMock.mockResolvedValue({
+      isInstalled: true,
+      enabledTools: [],
+      installedScopes: ['global'],
+    });
+
+    render(
+      <CcwToolsMcpCard
+        isInstalled={true}
+        enabledTools={['write_file', 'smart_search']}
+        onToggleTool={vi.fn()}
+        onUpdateConfig={vi.fn()}
+        onInstall={vi.fn()}
+      />,
+      { locale: 'en' }
+    );
+
+    const user = userEvent.setup();
+    await user.click(screen.getByText(/CCW MCP Server|mcp\.ccw\.title/i));
+    await user.click(
+      screen.getByRole('button', { name: /Save Configuration|mcp\.ccw\.actions\.saveConfig/i })
+    );
+
+    await waitFor(() => {
+      expect(updateClaudeMock).toHaveBeenCalledWith(
+        expect.objectContaining({
+          enabledTools: ['write_file', 'smart_search'],
+        })
+      );
+    });
+  });
+});
+