feat(core): decouple structured output from Groupped trait

Introduce `StructuralData` sealed trait and `pack_structural!` /
`group_structural!` / `derive(StructuralData)` macros to control
structured rendering separately from grouping. `Groupped` no longer
requires `Serialize`.

2 files changed, 4 insertions, 5 deletions

diff --git a/mingling_core/tests/test-all/tests/integration.rs b/mingling_core/tests/test-all/tests/integration.rs
index e173374..99910a9 100644
--- a/mingling_core/tests/test-all/tests/integration.rs
+++ b/mingling_core/tests/test-all/tests/integration.rs
@@ -3,6 +3,7 @@ use mingling::GeneralRenderer;
 use mingling::GeneralRendererSetting;
 use mingling::MockProgramCollect;
 use mingling::NextProcess;
+use mingling::StructuralData;
 use mingling::Node;
 use mingling::Program;
 use mingling::RenderResult;
@@ -90,7 +91,7 @@ fn test_render_result_print() {
 
 // GeneralRenderer
 
-#[derive(Debug, Clone, PartialEq, Serialize)]
+#[derive(Debug, Clone, PartialEq, Serialize, StructuralData)]
 struct TestData {
     name: String,
     value: i32,
diff --git a/mingling_core/tests/test-general-renderer/tests/integration.rs b/mingling_core/tests/test-general-renderer/tests/integration.rs
index 0fcc38d..2e2472e 100644
--- a/mingling_core/tests/test-general-renderer/tests/integration.rs
+++ b/mingling_core/tests/test-general-renderer/tests/integration.rs
@@ -1,9 +1,7 @@
-use mingling::GeneralRenderer;
-use mingling::GeneralRendererSetting;
-use mingling::RenderResult;
+use mingling::{GeneralRenderer, GeneralRendererSetting, RenderResult, StructuralData};
 use serde::Serialize;
 
-#[derive(Debug, Clone, PartialEq, Serialize)]
+#[derive(Debug, Clone, PartialEq, Serialize, StructuralData)]
 struct TestData {
     name: String,
     value: i32,