feat: add md<->docx document converters

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

test/converters/document.test.js

@@ -112,4 +112,33 @@ describe('document converters', () => {
     const detected = await detectInputMime(outputPath);
     expect(detected.mime).toBe('application/pdf');
   }, 20000);
+
+  it('converts DOCX to MD containing the source text', async () => {
+    const outputPath = path.join(tmpDir, 'from-docx.md');
+    const entry = resolve('docx', 'md');
+
+    await entry.convert(docxFixturePath, outputPath);
+
+    const markdown = await fs.readFile(outputPath, 'utf8');
+    expect(markdown).toContain('Hello from the fixture document');
+  }, 20000);
+
+  it('converts MD to DOCX preserving headings, bold text, and bullet lists', async () => {
+    const inputPath = path.join(tmpDir, 'fixture-for-docx.md');
+    await fs.writeFile(
+      inputPath,
+      '# Report Title\n\nSome **bold** finding.\n\n- first point\n- second point\n'
+    );
+    const outputPath = path.join(tmpDir, 'from-md.docx');
+    const entry = resolve('md', 'docx');
+
+    await entry.convert(inputPath, outputPath);
+
+    const mammoth = await import('mammoth');
+    const result = await mammoth.default.convertToHtml({ path: outputPath });
+    expect(result.value).toContain('Report Title');
+    expect(result.value).toContain('<strong>bold</strong>');
+    expect(result.value).toContain('first point');
+    expect(result.value).toContain('<li>');
+  }, 20000);
 });