feat: enhance model support by adding GPT-5.1 to .gitignore and updating cassette maintenance documentation for dual-model testing

tests/conftest.py

@@ -193,6 +193,7 @@ def disable_force_env_override(monkeypatch):
     monkeypatch.setenv("MAX_CONVERSATION_TURNS", "50")
 
     import importlib
+    import sys
 
     import config
     import utils.conversation_memory as conversation_memory
@@ -200,6 +201,10 @@ def disable_force_env_override(monkeypatch):
     importlib.reload(config)
     importlib.reload(conversation_memory)
 
+    test_conversation_module = sys.modules.get("tests.test_conversation_memory")
+    if test_conversation_module is not None:
+        test_conversation_module.MAX_CONVERSATION_TURNS = conversation_memory.MAX_CONVERSATION_TURNS
+
     try:
         yield
     finally: