fix(extension): disable symlinks on Windows during git clone to fix install failure

packages/core/src/extension/github.test.ts

@@ -56,6 +56,7 @@ describe('git extension helpers', () => {
     });
 
     it('should clone, fetch and checkout a repo', async () => {
+      mockPlatform.mockReturnValue('linux');
       const installMetadata = {
         source: 'http://my-repo.com',
         ref: 'my-ref',
@@ -79,6 +80,50 @@ describe('git extension helpers', () => {
       expect(mockGit.checkout).toHaveBeenCalledWith('FETCH_HEAD');
     });
 
+    it('should use core.symlinks=false on Windows to avoid permission errors', async () => {
+      mockPlatform.mockReturnValue('win32');
+      const installMetadata = {
+        source: 'http://my-repo.com',
+        ref: 'my-ref',
+        type: 'git' as const,
+      };
+      const destination = '/dest';
+      mockGit.getRemotes.mockResolvedValue([
+        { name: 'origin', refs: { fetch: 'http://my-repo.com' } },
+      ]);
+
+      await cloneFromGit(installMetadata, destination);
+
+      expect(mockGit.clone).toHaveBeenCalledWith('http://my-repo.com', './', [
+        '-c',
+        'core.symlinks=false',
+        '--depth',
+        '1',
+      ]);
+    });
+
+    it('should use core.symlinks=true on non-Windows platforms', async () => {
+      mockPlatform.mockReturnValue('darwin');
+      const installMetadata = {
+        source: 'http://my-repo.com',
+        ref: 'my-ref',
+        type: 'git' as const,
+      };
+      const destination = '/dest';
+      mockGit.getRemotes.mockResolvedValue([
+        { name: 'origin', refs: { fetch: 'http://my-repo.com' } },
+      ]);
+
+      await cloneFromGit(installMetadata, destination);
+
+      expect(mockGit.clone).toHaveBeenCalledWith('http://my-repo.com', './', [
+        '-c',
+        'core.symlinks=true',
+        '--depth',
+        '1',
+      ]);
+    });
+
     it('should use HEAD if ref is not provided', async () => {
       const installMetadata = {
         source: 'http://my-repo.com',

packages/core/src/extension/github.ts

@@ -75,9 +75,12 @@ export async function cloneFromGit(
         // We let git handle the source as is.
       }
     }
+    // On Windows, symlinks require elevated privileges by default, so we
+    // disable them to avoid "Permission denied" errors during checkout.
+    const symlinkValue = os.platform() === 'win32' ? 'false' : 'true';
     await git.clone(sourceUrl, './', [
       '-c',
-      'core.symlinks=true',
+      `core.symlinks=${symlinkValue}`,
       '--depth',
       '1',
     ]);