feat: add md<->pdf document converters

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

test/converters/document.test.js

@@ -100,4 +100,16 @@ describe('document converters', () => {
     expect(markdown).toContain('# Heading');
     expect(markdown).toContain('**bold**');
   });
+
+  it('converts MD to a valid PDF', async () => {
+    const inputPath = path.join(tmpDir, 'fixture-for-pdf.md');
+    await fs.writeFile(inputPath, '# Heading\n\nSome text.');
+    const outputPath = path.join(tmpDir, 'from-md.pdf');
+    const entry = resolve('md', 'pdf');
+
+    await entry.convert(inputPath, outputPath);
+
+    const detected = await detectInputMime(outputPath);
+    expect(detected.mime).toBe('application/pdf');
+  }, 20000);
 });

test/converters/documentFromPdf.test.js

@@ -48,6 +48,16 @@ describe('PDF source document converters', () => {
     expect(html).toContain('<p>');
   });
 
+  it('extracts text from PDF to MD', async () => {
+    const outputPath = path.join(tmpDir, 'output.md');
+    const entry = resolve('pdf', 'md');
+
+    await entry.convert(pdfFixturePath, outputPath);
+
+    const markdown = await fs.readFile(outputPath, 'utf8');
+    expect(markdown).toContain('Extractable fixture text');
+  });
+
   it('reconstructs PDF text into a DOCX (best-effort)', async () => {
     const outputPath = path.join(tmpDir, 'output.docx');
     const entry = resolve('pdf', 'docx');