fix(gateway): normalize Gemini Vertex embedding transport

apps/aether-gateway/src/orchestration/classifier.rs

@@ -32,6 +32,7 @@ pub(crate) enum LocalFailoverClassification {
     UseDefault,
     StopStatusCode,
     StopErrorPattern,
+    StopExecutionError,
     RetrySuccessPattern,
     RetryStatusCode,
     RetryUpstreamFailure,
@@ -43,6 +44,7 @@ impl LocalFailoverClassification {
             Self::UseDefault => "use_default",
             Self::StopStatusCode => "stop_status_code",
             Self::StopErrorPattern => "stop_error_pattern",
+            Self::StopExecutionError => "stop_execution_error",
             Self::RetrySuccessPattern => "retry_success_pattern",
             Self::RetryStatusCode => "retry_status_code",
             Self::RetryUpstreamFailure => "retry_upstream_failure",

apps/aether-gateway/src/orchestration/effects.rs

@@ -821,7 +821,8 @@ fn local_candidate_failure_should_invalidate_affinity(
         LocalFailoverClassification::UseDefault | LocalFailoverClassification::StopStatusCode => {
             status_code >= 500
         }
-        LocalFailoverClassification::StopErrorPattern => false,
+        LocalFailoverClassification::StopErrorPattern
+        | LocalFailoverClassification::StopExecutionError => false,
     }
 }
 

apps/aether-gateway/src/orchestration/health.rs

@@ -155,7 +155,8 @@ fn local_candidate_failure_should_project_health(
         LocalFailoverClassification::UseDefault | LocalFailoverClassification::StopStatusCode => {
             status_code >= 500
         }
-        LocalFailoverClassification::StopErrorPattern => false,
+        LocalFailoverClassification::StopErrorPattern
+        | LocalFailoverClassification::StopExecutionError => false,
     }
 }
 

apps/aether-gateway/src/orchestration/mod.rs

@@ -92,7 +92,9 @@ pub(crate) fn build_local_error_flow_metadata(
 ) -> Value {
     let safe_to_expose = matches!(
         analysis.classification,
-        LocalFailoverClassification::StopStatusCode | LocalFailoverClassification::StopErrorPattern
+        LocalFailoverClassification::StopStatusCode
+            | LocalFailoverClassification::StopErrorPattern
+            | LocalFailoverClassification::StopExecutionError
     );
     let propagation = match analysis.decision {
         LocalFailoverDecision::RetryNextCandidate => "suppressed",

apps/aether-gateway/src/orchestration/recovery.rs

@@ -57,7 +57,10 @@ const fn decision_from_classification(
     match classification {
         LocalFailoverClassification::UseDefault => LocalFailoverDecision::UseDefault,
         LocalFailoverClassification::StopStatusCode
-        | LocalFailoverClassification::StopErrorPattern => LocalFailoverDecision::StopLocalFailover,
+        | LocalFailoverClassification::StopErrorPattern
+        | LocalFailoverClassification::StopExecutionError => {
+            LocalFailoverDecision::StopLocalFailover
+        }
         LocalFailoverClassification::RetrySuccessPattern
         | LocalFailoverClassification::RetryStatusCode
         | LocalFailoverClassification::RetryUpstreamFailure => {