fix: add follow_redirects=True to all httpx stream calls

HuggingFace now serves dataset files via CDN redirects (302), causing
httpx to raise HTTPStatusError instead of following the redirect.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: mishig25

src/doc_builder/external.py

@@ -106,7 +106,7 @@ def get_objects_map(package_name, version="main", language="en", repo_owner="hug
     doc_url = f"{HF_DOC_PREFIX}{package_name}/{package_version}/{language}"
     url = f"{doc_url}/objects.inv"
     try:
-        with httpx.stream("GET", url) as request:
+        with httpx.stream("GET", url, follow_redirects=True) as request:
             request.raise_for_status()
             with tempfile.TemporaryDirectory() as tmp_dir:
                 tmp_file = os.path.join(tmp_dir, "objects.inv")

src/doc_builder/process_hf_docs.py

@@ -121,7 +121,7 @@ def download_and_extract_zip(library_name: str, output_dir: Path, zip_filename:
 
     try:
         print(f"  Downloading {zip_url}...")
-        with httpx.stream("GET", zip_url) as response:
+        with httpx.stream("GET", zip_url, follow_redirects=True) as response:
             response.raise_for_status()
 
             # Get total size for progress bar