fix(run_agent): ensure proper cleanup of OpenAI client in background review

Added explicit closing of the OpenAI/httpx client in the background review process to prevent "Event loop is closed" errors. This change ensures that the client is properly cleaned up when the review agent is no longer needed, enhancing stability and resource management.

run_agent.py

@@ -1405,9 +1405,11 @@ class AIAgent:
 
         def _run_review():
             import contextlib, os as _os
+            review_agent = None
             try:
                 with open(_os.devnull, "w") as _devnull, \
-                     contextlib.redirect_stdout(_devnull):
+                     contextlib.redirect_stdout(_devnull), \
+                     contextlib.redirect_stderr(_devnull):
                     review_agent = AIAgent(
                         model=self.model,
                         max_iterations=8,
@@ -1460,6 +1462,20 @@ class AIAgent:
 
             except Exception as e:
                 logger.debug("Background memory/skill review failed: %s", e)
+            finally:
+                # Explicitly close the OpenAI/httpx client so GC doesn't
+                # try to clean it up on a dead asyncio event loop (which
+                # produces "Event loop is closed" errors in the terminal).
+                if review_agent is not None:
+                    client = getattr(review_agent, "client", None)
+                    if client is not None:
+                        try:
+                            review_agent._close_openai_client(
+                                client, reason="bg_review_done", shared=True
+                            )
+                            review_agent.client = None
+                        except Exception:
+                            pass
 
         t = threading.Thread(target=_run_review, daemon=True, name="bg-review")
         t.start()