fix(client): keep final delta when a chunk sets done in one envelope

chat_stream broke out of its read loop on the first chunk carrying
done=True, before yielding that chunk's delta. A publisher that flags its
last content chunk with done (delta + done in a single envelope) had its
final text silently dropped on the Python client — while the HTTP SSE
consumer, which emits content before honoring the finish, kept it. Yield
any non-empty delta before honoring done so both consumers agree.

Author: Zawwarsami16

zhub/client.py

@@ -400,9 +400,15 @@ async def chat_stream(self, messages: list[dict[str, Any]],
                     break
                 if item is None:
                     break
+                # Yield any content on this chunk BEFORE honoring `done`, so a
+                # publisher that flags its final content chunk with done=True
+                # (delta + done in one envelope) doesn't lose that last delta.
+                # Matches the HTTP SSE path, which emits text before the finish.
+                delta = item.get("delta", "")
+                if delta:
+                    yield delta
                 if item.get("done"):
                     break
-                yield item.get("delta", "")
         finally:
             self._streams.pop(env.request_id, None)