Fix ServeConverter not returning document_json for chunking

The remote converter never set document_json in ConversionResult,
silently preventing chunking from working in remote mode.

document-parser/infra/serve_converter.py

@@ -152,11 +152,14 @@ def _parse_response(data: dict) -> ConversionResult:
 
     page_count = len(pages) if pages else 1
 
+    document_json = json.dumps(json_content) if json_content else None
+
     return ConversionResult(
         page_count=page_count,
         content_markdown=content_md,
         content_html=content_html,
         pages=pages,
+        document_json=document_json,
     )
 
 

document-parser/tests/test_serve_converter.py

@@ -74,6 +74,7 @@ class TestParseResponse:
         assert result.content_html == "<h1>Hello</h1>"
         assert result.page_count == 1
         assert result.pages[0].width == 612.0
+        assert result.document_json is not None
 
     def test_response_with_elements(self):
         data = {
@@ -159,6 +160,7 @@ class TestParseResponse:
         assert result.content_markdown == "text"
         assert result.pages == []
         assert result.page_count == 1
+        assert result.document_json is None
 
     def test_json_content_as_string(self):
         json_doc = {