Fix lint

Author: amri369

src/agents/result.py

@@ -8,6 +8,7 @@
 
 from typing_extensions import TypeVar
 
+from ._run_impl import QueueCompleteSentinel
 from .agent_output import AgentOutputSchema
 from .exceptions import InputGuardrailTripwireTriggered, MaxTurnsExceeded
 from .guardrail import FactCheckingGuardrailResult, InputGuardrailResult, OutputGuardrailResult
@@ -16,7 +17,6 @@
 from .stream_events import StreamEvent
 from .tracing import Trace
 from .util._pretty_print import pretty_print_result, pretty_print_run_result_streaming
-from ._run_impl import QueueCompleteSentinel
 
 if TYPE_CHECKING:
     from .agent import Agent