feat(archive): add tar.bz2 converter via 7za

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

test/converters/archive.test.js

@@ -133,3 +133,31 @@ describe('archive converters — tar / tar.gz', () => {
     await fs.rm(listDir, { recursive: true, force: true });
   });
 });
+
+describe('archive converters — tar.bz2', () => {
+  it('registers tar.bz2 as a target for tar and vice versa', () => {
+    expect(listTargetFormats('tar')).toContain('tar.bz2');
+    expect(listTargetFormats('tar.bz2')).toContain('tar');
+  });
+
+  it(
+    'converts zip -> tar.bz2 -> tar, preserving content',
+    async () => {
+      const zipPath = path.join(tmpDir, 'for-bz2.zip');
+      buildZipFixture(zipPath);
+
+      const bz2Path = path.join(tmpDir, 'output.tar.bz2');
+      await resolve('zip', 'tar.bz2').convert(zipPath, bz2Path, { quality: 9 });
+
+      const backToTarPath = path.join(tmpDir, 'from-bz2.tar');
+      await resolve('tar.bz2', 'tar').convert(bz2Path, backToTarPath);
+
+      const listDir = await fs.mkdtemp(path.join(os.tmpdir(), 'bz2-check-'));
+      await tar.extract({ file: backToTarPath, cwd: listDir });
+      expect(await fs.readFile(path.join(listDir, 'hello.txt'), 'utf8')).toBe('hello world');
+      expect(await fs.readFile(path.join(listDir, 'nested', 'inner.txt'), 'utf8')).toBe('nested content');
+      await fs.rm(listDir, { recursive: true, force: true });
+    },
+    20000
+  );
+});