Add optional status field to StatusResponse model in remote rollout processor

- Introduced an optional status indicator in the StatusResponse model to differentiate between successful and failed rollouts.
- Updated documentation to clarify the purpose of the new status field for better understanding in the eval-protocol context.

Author: Dylan Huang

eval_protocol/types/remote_rollout_processor.py

@@ -4,7 +4,7 @@
 
 from typing import Any, Dict, List, Optional
 from pydantic import BaseModel, Field
-from eval_protocol.models import Message
+from eval_protocol.models import Message, Status
 
 
 class RolloutMetadata(BaseModel):
@@ -40,6 +40,12 @@ class StatusResponse(BaseModel):
     terminated: bool
     info: Optional[Dict[str, Any]] = None
 
+    status: Optional[Status] = None
+    """
+    Optional status indicator for the rollout to be used by eval-protocol. This
+    is useful to distinguish between successful and failed rollouts.
+    """
+
 
 def create_langfuse_config_tags(init_request: InitRequest) -> List[str]:
     """Create Langfuse tags from InitRequest metadata."""