style: fix ruff docstring blank lines in safe_executor

Author: dvilelaf

src/iwa/core/services/safe_executor.py

@@ -320,6 +320,7 @@ def _handle_execution_failure(  # noqa: C901
             nonce race (GS026 with pre-assigned nonce).  The caller uses this
             to choose between fast fixed delay and exponential backoff without
             re-classifying the error a second time.
+
         """
         classification = self._classify_error(error, allow_nonce_refresh=allow_nonce_refresh)
         is_fee_error = classification["is_fee_error"]
@@ -559,6 +560,7 @@ def _classify_error(self, error: Exception, allow_nonce_refresh: bool = True) ->
 
         The returned dict guarantees mutual exclusivity:
         ``is_parallel_nonce_race=True`` implies ``is_signature_error=False``.
+
         """
         err_text = str(error).lower()
         decoded = (self._decode_revert_reason(error) or "").lower()