feat: Classify unevaluable config registry targets

Stainless-Generated-From: 89ffaef01313311d22f91e6eba840096c085be85

Author: kernel-internal[bot]

src/kernel/types/no_recommendation.py

@@ -8,7 +8,7 @@
 
 
 class NoRecommendation(BaseModel):
-    code: Literal["proxy_restricted", "no_working_configuration", "inconclusive"]
+    code: Literal["proxy_restricted", "target_not_evaluable", "no_working_configuration", "inconclusive"]
     """
     Machine-readable reason Kernel cannot currently provide a config recommendation.
     """