Add execution metadata to module specifications

internal/framework/pipeline/module_test.go

@@ -1,12 +1,25 @@
 package pipeline
 
 import (
+	"reflect"
 	"strings"
 	"testing"
 
 	"gitea.maximumdirect.net/eric/notarius/internal/framework/contracts"
 )
 
+func TestNormalizeModuleSpecDefaultsExecutionClass(t *testing.T) {
+	normalized := normalizeModuleSpec(ModuleSpec{Key: " module ", Stage: StageChunk})
+	if normalized.ExecutionClass != contracts.ExecutionClassDeterministic {
+		t.Fatalf("ExecutionClass = %q, want deterministic compatibility default", normalized.ExecutionClass)
+	}
+
+	cloned := cloneModuleSpec(normalized)
+	if !reflect.DeepEqual(cloned, normalized) {
+		t.Fatalf("cloneModuleSpec() = %#v, want %#v", cloned, normalized)
+	}
+}
+
 func TestValidateModuleSpecAllowsReferenceSlotsForEligibleStages(t *testing.T) {
 	tests := []struct {
 		name  string