feat(companion): add platform createHeartbeatLoop helper

src/companion/platformClients.test.ts

@@ -223,4 +223,19 @@ describe('platform companion clients', () => {
       'sessionId is required (provide one or configure defaultSessionId)',
     );
   });
+
+  it('creates a bound heartbeat loop helper from platform clients', async () => {
+    const mock = createRuntimeMock();
+    const client = new IOSCompanionClient({ runtime: mock.runtime, nodeId: 'ios-node' });
+
+    const loop = client.createHeartbeatLoop();
+    await loop.tickNow();
+
+    expect(mock.setNodeStatus).toHaveBeenCalledWith(
+      expect.objectContaining({
+        platform: 'ios',
+        statusText: 'heartbeat',
+      }),
+    );
+  });
 });