feat: Remove support for launching vats outside a subcluster

packages/extension/src/ui/App.test.tsx

@@ -61,8 +61,5 @@ describe('App', () => {
     const { App } = await import('./App.tsx');
     render(<App />);
     expect(screen.getByText('Kernel')).toBeInTheDocument();
-    expect(
-      screen.getByRole('button', { name: 'Launch Vat' }),
-    ).toBeInTheDocument();
   });
 });

packages/extension/src/ui/components/ControlPanel.test.tsx

@@ -4,17 +4,12 @@ import { describe, it, expect, vi, beforeEach } from 'vitest';
 import { ControlPanel } from './ControlPanel.tsx';
 import { KernelControls } from './KernelControls.tsx';
 import { LaunchSubcluster } from './LaunchSubcluster.tsx';
-import { LaunchVat } from './LaunchVat.tsx';
 import { SubclustersTable } from './SubclustersTable.tsx';
 
 vi.mock('./KernelControls.tsx', () => ({
   KernelControls: vi.fn(() => <div data-testid="kernel-controls" />),
 }));
 
-vi.mock('./LaunchVat.tsx', () => ({
-  LaunchVat: vi.fn(() => <div data-testid="launch-vat" />),
-}));
-
 vi.mock('./LaunchSubcluster.tsx', () => ({
   LaunchSubcluster: vi.fn(() => <div data-testid="launch-subcluster" />),
 }));
@@ -44,14 +39,11 @@ describe('ControlPanel Component', () => {
   it('renders all child components in correct order', () => {
     render(<ControlPanel />);
 
-    const children = screen.getAllByTestId(
-      /-controls|-table|-vat|-subcluster$/u,
-    );
-    expect(children).toHaveLength(4);
+    const children = screen.getAllByTestId(/-controls|-table|-subcluster$/u);
+    expect(children).toHaveLength(3);
     expect(children[0]).toHaveAttribute('data-testid', 'kernel-controls');
     expect(children[1]).toHaveAttribute('data-testid', 'subclusters-table');
-    expect(children[2]).toHaveAttribute('data-testid', 'launch-vat');
-    expect(children[3]).toHaveAttribute('data-testid', 'launch-subcluster');
+    expect(children[2]).toHaveAttribute('data-testid', 'launch-subcluster');
   });
 
   it('renders header section with correct class', () => {
@@ -70,11 +62,6 @@ describe('ControlPanel Component', () => {
     expect(SubclustersTable).toHaveBeenCalled();
   });
 
-  it('renders LaunchVat component', () => {
-    render(<ControlPanel />);
-    expect(LaunchVat).toHaveBeenCalled();
-  });
-
   it('renders LaunchSubcluster component', () => {
     render(<ControlPanel />);
     expect(LaunchSubcluster).toHaveBeenCalled();

packages/extension/src/ui/components/ControlPanel.tsx

@@ -1,6 +1,5 @@
 import { KernelControls } from './KernelControls.tsx';
 import { LaunchSubcluster } from './LaunchSubcluster.tsx';
-import { LaunchVat } from './LaunchVat.tsx';
 import { SubclustersTable } from './SubclustersTable.tsx';
 import styles from '../App.module.css';
 
@@ -12,7 +11,6 @@ export const ControlPanel: React.FC = () => {
         <KernelControls />
       </div>
       <SubclustersTable />
-      <LaunchVat />
       <LaunchSubcluster />
     </>
   );

packages/extension/src/ui/components/KernelControls.test.tsx

@@ -28,7 +28,6 @@ const mockUseKernelActions = (overrides = {}): void => {
     terminateAllVats: vi.fn(),
     clearState: vi.fn(),
     reload: vi.fn(),
-    launchVat: vi.fn(),
     collectGarbage: vi.fn(),
     launchSubcluster: vi.fn(),
     ...overrides,
@@ -37,10 +36,7 @@ const mockUseKernelActions = (overrides = {}): void => {
 
 const mockUseVats = (vats: VatRecord[] = []): void => {
   vi.mocked(useVats).mockReturnValue({
-    groupedVats: {
-      subclusters: [],
-      rogueVats: vats,
-    },
+    subclusters: [],
     pingVat: vi.fn(),
     restartVat: vi.fn(),
     terminateVat: vi.fn(),

packages/extension/src/ui/components/MessagePanel.test.tsx

@@ -38,7 +38,6 @@ describe('MessagePanel Component', () => {
       collectGarbage: vi.fn(),
       clearState: vi.fn(),
       reload: vi.fn(),
-      launchVat: vi.fn(),
       launchSubcluster: vi.fn(),
     });
     vi.mocked(usePanelContext).mockReturnValue({