fix: Add logging filter to suppress CancelledError noise

The asyncio.CancelledError from Gradio's internal queue operations
during connection close is normal behavior and should not be logged
or counted as a runtime error.

This adds a logging filter to suppress:
- httpcore.connection DEBUG logs during close
- CancelledError messages from asyncio queues

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

app.py

@@ -33,6 +33,18 @@ LOGS_DIR.mkdir(parents=True, exist_ok=True)
 # ========== Logging Configuration ==========
 # Configure logging early to capture all events
 LOGS_DIR.mkdir(parents=True, exist_ok=True)
+
+# Filter to suppress CancelledError noise from Gradio's internal queues
+class CancelledErrorFilter(logging.Filter):
+    def filter(self, record):
+        # Suppress DEBUG logs about httpcore connection close
+        if "httpcore.connection" in record.getName() and record.levelno <= logging.DEBUG:
+            return False
+        # Suppress CancelledError from asyncio queues (normal shutdown)
+        if "CancelledError" in record.getMessage():
+            return False
+        return True
+
 logging.basicConfig(
     level=logging.DEBUG,
     format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
@@ -43,6 +55,9 @@ logging.basicConfig(
 )
 logger = logging.getLogger(__name__)
 
+# Add filter to root logger
+logging.getLogger().addFilter(CancelledErrorFilter())
+
 # ========== Critical Import Error Handler ==========
 # This MUST come before any imports that might fail
 _crash_log_path = Path.home() / ".openclaw" / "logs" / "crash.log"