feat(companion): add platform bootstrap helper

src/companion/platformClients.test.ts

@@ -151,4 +151,21 @@ describe('platform companion clients', () => {
     expect(mock.deleteCanvasArtifact).toHaveBeenCalledWith({ sessionId: 'ws:test-canvas', artifactId: 'a1' });
     expect(mock.clearCanvasArtifacts).toHaveBeenCalledWith('ws:test-canvas');
   });
+
+  it('bootstrap registers node and then fetches capabilities', async () => {
+    const mock = createRuntimeMock();
+    const client = new IOSCompanionClient({ runtime: mock.runtime, nodeId: 'ios-node' });
+
+    const result = await client.bootstrap();
+
+    expect(mock.registerNode).toHaveBeenCalledOnce();
+    expect(mock.getNodeCapabilities).toHaveBeenCalledOnce();
+    expect(mock.registerNode.mock.invocationCallOrder[0]).toBeLessThan(
+      mock.getNodeCapabilities.mock.invocationCallOrder[0],
+    );
+    expect(result).toEqual({
+      register: { registered: true },
+      capabilities: expect.any(Object),
+    });
+  });
 });