fix(core): Ensure correct ArrayBuffer return, fix fetch body typing, reorganize node-only tests, and bump tsbuild devDependency

test/test.streamnode.node.ts

@@ -0,0 +1,27 @@
+import { tap, expect } from '@git.zone/tstest/tapbundle';
+import { SmartRequest } from '../ts/index.js';
+
+tap.test('should have streamNode() method available', async () => {
+  const response = await SmartRequest.create()
+    .url('https://httpbin.org/get')
+    .get();
+
+  // Verify streamNode() method exists
+  expect(response.streamNode).toBeDefined();
+  expect(typeof response.streamNode).toEqual('function');
+  
+  // In Node.js, it should return a stream
+  const nodeStream = response.streamNode();
+  expect(nodeStream).toBeDefined();
+  
+  // Verify it's a Node.js readable stream
+  expect(typeof nodeStream.pipe).toEqual('function');
+  expect(typeof nodeStream.on).toEqual('function');
+  
+  // Consume the stream to avoid hanging
+  nodeStream.resume();
+});
+
+
+
+export default tap.start();