Add execution metadata to module specifications

internal/framework/pipeline/module.go

@@ -23,6 +23,7 @@ const (
 type ModuleSpec struct {
 	Key            string
 	Stage          ModuleStage
+	ExecutionClass contracts.ExecutionClass
 	ArtifactKind   contracts.ArtifactKind
 	Provides       []string
 	Requires       []string
@@ -37,9 +38,14 @@ func defaultModuleSpec(key string, stage ModuleStage) ModuleSpec {
 }
 
 func normalizeModuleSpec(spec ModuleSpec) ModuleSpec {
+	executionClass := contracts.ExecutionClass(strings.TrimSpace(string(spec.ExecutionClass)))
+	if executionClass == "" {
+		executionClass = contracts.ExecutionClassDeterministic
+	}
 	return ModuleSpec{
 		Key:            strings.TrimSpace(spec.Key),
 		Stage:          spec.Stage,
+		ExecutionClass: executionClass,
 		ArtifactKind:   normalizeArtifactKind(spec.ArtifactKind),
 		Provides:       normalizeCapabilities(spec.Provides),
 		Requires:       normalizeCapabilities(spec.Requires),
@@ -76,6 +82,7 @@ func cloneModuleSpec(spec ModuleSpec) ModuleSpec {
 	return ModuleSpec{
 		Key:            spec.Key,
 		Stage:          spec.Stage,
+		ExecutionClass: spec.ExecutionClass,
 		ArtifactKind:   spec.ArtifactKind,
 		Provides:       append([]string(nil), spec.Provides...),
 		Requires:       append([]string(nil), spec.Requires...),