Fix agent-runner: 600s read timeout on bedrock-agentcore streaming

src/lambdas/agent-runner/handler.py

@@ -21,7 +21,12 @@ def get_ddb():
 def get_agentcore():
     global _agentcore
     if _agentcore is None:
-        _agentcore = boto3.client('bedrock-agentcore', region_name='us-east-1')
+        from botocore.config import Config
+        _agentcore = boto3.client(
+            'bedrock-agentcore',
+            region_name='us-east-1',
+            config=Config(read_timeout=600, connect_timeout=10)
+        )
     return _agentcore