always defer traces for convo and so fix tests to reflect that

lib/crewai/tests/test_flow_conversation.py

@@ -1333,6 +1333,12 @@ class TestFlowTracingWhenSuppressed:
 
 
 class TestDeferTraceFinalization:
+    def test_bare_conversational_flow_defers_by_default(self) -> None:
+        class BareChat(ConversationalFlow):
+            pass
+
+        assert BareChat()._should_defer_trace_finalization() is True
+
     def test_conversation_config_drives_defer_flag(self) -> None:
         """``ConversationConfig(defer_trace_finalization=...)`` controls whether
         a conversational subclass defers per-turn trace finalization."""

lib/crewai/tests/test_flow_definition.py

@@ -221,6 +221,7 @@ def test_flow_definition_includes_conversational_builtins_when_enabled():
 
     assert definition.conversational is not None
     assert definition.conversational.enabled is True
+    assert definition.conversational.defer_trace_finalization is True
     assert definition.conversational.builtin_routes == ["converse", "end"]
     assert "conversation_start" in methods
     assert "route_conversation" in methods