Expose transport and malformed generation errors

errors_internal_test.go

@@ -73,3 +73,10 @@ func TestMapPublicErrorPreservesValidationAroundGenerationError(t *testing.T) {
 		t.Fatalf("mapped error exposes internal ProviderHTTPError: %v", err)
 	}
 }
+
+func TestMapPublicErrorDoesNotTreatRequestEncodingAsTransport(t *testing.T) {
+	err := mapPublicError(fmt.Errorf("%w: %w", usecase.ErrLLMGenerate, llm.ErrRequestFailed))
+	if !errors.Is(err, ErrLLMGenerate) || errors.Is(err, ErrTransport) {
+		t.Fatalf("request encoding category = %v", err)
+	}
+}