fixes

src/ai_client.py

@@ -11,13 +11,12 @@ stale [FILES UPDATED] entries and dropping the oldest message pairs.
 For Gemini: injects the initial context directly into system_instruction 
 during chat creation to avoid massive history bloat.
 """
-# ai_client.py
 import anthropic
 from google import genai
-from google.api_core import exceptions as gac
-from google.genai    import types
 from openai import OpenAI
 
+from google.genai import types
+
 import asyncio
 import datetime
 import difflib