Add execution metadata to module specifications

internal/modules/dnd/extract/spells/extractor.go

@@ -200,6 +200,7 @@ func ModuleSpec() pipeline.ModuleSpec {
 	return pipeline.ModuleSpec{
 		Key:            Key,
 		Stage:          pipeline.StageExtract,
+		ExecutionClass: contracts.ExecutionClassLLMBacked,
 		Requires:       append([]string(nil), requiredCapabilities...),
 		Provides:       append([]string(nil), providedCapabilities...),
 		ArtifactKind:   dnd.SpellListKind,

internal/modules/dnd/extract/spells/registry_test.go

@@ -23,8 +23,9 @@ func TestNewRequiresLLMClientAndReturnsExtractor(t *testing.T) {
 func TestModuleSpec(t *testing.T) {
 	got := ModuleSpec()
 	want := pipeline.ModuleSpec{
-		Key:   Key,
-		Stage: pipeline.StageExtract,
+		Key:            Key,
+		Stage:          pipeline.StageExtract,
+		ExecutionClass: contracts.ExecutionClassLLMBacked,
 		Requires: []string{
 			"chunks",
 			"source.transcript",