chore: align JudgeResult field order to match spec

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: jsonbailey

packages/sdk/server-ai/src/ldai/providers/types.py

@@ -66,9 +66,9 @@ class JudgeResult:
     success: bool = False
     error_message: Optional[str] = None
     sampled: bool = False  # True when the evaluation was sampled and run
+    metric_key: Optional[str] = None
     score: Optional[float] = None
     reasoning: Optional[str] = None
-    metric_key: Optional[str] = None
 
     def to_dict(self) -> Dict[str, Any]:
         """