Centralize validator classification and malformed output handling

internal/validators/registry_test.go

@@ -82,11 +82,6 @@ func TestBuiltInValidatorPackagesConstruct(t *testing.T) {
 
 func TestRegistryBuildsClassifiedValidators(t *testing.T) {
 	r := NewBuiltInRegistry()
-	llmKeys := map[string]bool{
-		KeySpokenFormPlausibility: true,
-		KeyMeaningReversalReview:  true,
-		KeyEditorialReview:        true,
-	}
 	for _, key := range r.RegisteredKeys() {
 		v, err := r.MustBuild(key)
 		if err != nil {
@@ -95,16 +90,28 @@ func TestRegistryBuildsClassifiedValidators(t *testing.T) {
 		if _, ok := v.(validatormetadata.ClassifiedValidator); !ok {
 			t.Fatalf("expected built validator %q to expose execution classification metadata", key)
 		}
-		want := validatormetadata.ExecutionClassDeterministic
-		if llmKeys[key] {
-			want = validatormetadata.ExecutionClassLLMBacked
-		}
+		want := validatormetadata.ClassForKey(key)
 		if got := validatormetadata.ClassOf(v); got != want {
 			t.Fatalf("expected class %q for %q, got %q", want, key, got)
 		}
 	}
 }
 
+func TestExecutionClassResolvableByStableKeyAndByValidatorInstance(t *testing.T) {
+	r := NewBuiltInRegistry()
+	for _, key := range r.RegisteredKeys() {
+		v, err := r.MustBuild(key)
+		if err != nil {
+			t.Fatalf("must build %q: %v", key, err)
+		}
+		fromKey := validatormetadata.ClassForKey(key)
+		fromInstance := validatormetadata.ClassOf(v)
+		if fromInstance != fromKey {
+			t.Fatalf("class mismatch for %q: key=%q instance=%q", key, fromKey, fromInstance)
+		}
+	}
+}
+
 func TestRegistryProtectedTermsUsesNonGlossaryStageBehavior(t *testing.T) {
 	r := NewBuiltInRegistry()
 	v, err := r.MustBuild(KeyProtectedTerms)