refactor: use _should_sanitize_tool_calls in _handle_max_iterations()

Replaces hardcoded Mistral check with the new _should_sanitize_tool_calls()
method. Ensures summary generation works correctly with Fireworks and
other strict APIs that reject unknown tool_call fields.

run_agent.py

@@ -6282,13 +6282,13 @@ class AIAgent:
         try:
             # Build API messages, stripping internal-only fields
             # (finish_reason, reasoning) that strict APIs like Mistral reject with 422
-            _is_strict_api = "api.mistral.ai" in self._base_url_lower
+            _needs_sanitize = self._should_sanitize_tool_calls()
             api_messages = []
             for msg in messages:
                 api_msg = msg.copy()
                 for internal_field in ("reasoning", "finish_reason"):
                     api_msg.pop(internal_field, None)
-                if _is_strict_api:
+                if _needs_sanitize:
                     self._sanitize_tool_calls_for_strict_api(api_msg)
                 api_messages.append(api_msg)