fix(compressor): ABC compliance — total_tokens, api_mode, logger consistency

agent/context_engine.py

@@ -200,6 +200,7 @@ class ContextEngine(ABC):
         base_url: str = "",
         api_key: str = "",
         provider: str = "",
+        api_mode: str = "",
     ) -> None:
         """Called when the user switches models or on fallback activation.