fix(infra): api_hook_client debug logging, gemini_cli_adapter streaming fixes, ai_client minor

gemini_cli_adapter.py

@@ -130,3 +130,11 @@ class GeminiCliAdapter:
    "tool_calls": tool_calls,
    "stderr": stderr_final
   }
+
+ def count_tokens(self, contents: list[str]) -> int:
+  """
+        Provides a character-based token estimation for the Gemini CLI.
+        Uses 4 chars/token as a conservative average.
+        """
+  total_chars = len("\n".join(contents))
+  return total_chars // 4