fix(learning): remove archive size validation

tests/unit/learning-project-download.test.ts

@@ -67,6 +67,46 @@ describe('Learning project verified download', () => {
     );
   });
 
+  it('downloads without comparing metadata or transport-reported archive sizes', async () => {
+    const fetchImpl = vi.fn<typeof fetch>().mockResolvedValue(new Response(archive, {
+      status: 200,
+      headers: { 'Content-Type': 'application/zip', 'Content-Length': String(archive.length + 100) },
+    }));
+    const destinationPath = join(root, 'large-project.zip');
+
+    await saveLearningProjectArchive({
+      project: project({ archiveBytes: 512 * 1024 * 1024 + 1 }),
+      destinationPath,
+      binding,
+      fetchImpl,
+      getAccessToken: vi.fn().mockResolvedValue('works-token'),
+      isCurrentAccountBinding: () => true,
+      apiBaseUrl: 'https://square.example',
+    });
+
+    await expect(readFile(destinationPath)).resolves.toEqual(archive);
+  });
+
+  it('downloads when the archive response omits Content-Length', async () => {
+    const fetchImpl = vi.fn<typeof fetch>().mockResolvedValue(new Response(archive, {
+      status: 200,
+      headers: { 'Content-Type': 'application/zip' },
+    }));
+    const destinationPath = join(root, 'unknown-size-project.zip');
+
+    await saveLearningProjectArchive({
+      project: project({ archiveBytes: 1 }),
+      destinationPath,
+      binding,
+      fetchImpl,
+      getAccessToken: vi.fn().mockResolvedValue('works-token'),
+      isCurrentAccountBinding: () => true,
+      apiBaseUrl: 'https://square.example',
+    });
+
+    await expect(readFile(destinationPath)).resolves.toEqual(archive);
+  });
+
   it('rejects an unsafe redirect and never forwards Bearer credentials to redirects', async () => {
     const fetchImpl = vi.fn<typeof fetch>().mockResolvedValue(new Response(null, {
       status: 302,