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`.

1 files changed, 26 insertions, 66 deletions

diff --git a/mingling_core/src/any/group.rs b/mingling_core/src/any/group.rs
index e9fce5e..07f8400 100644
--- a/mingling_core/src/any/group.rs
+++ b/mingling_core/src/any/group.rs
@@ -1,74 +1,34 @@
-#[cfg(feature = "general_renderer")]
-pub use general_renderer_groupped::*;
-
-#[cfg(not(feature = "general_renderer"))]
-pub use groupped::*;
-
-#[cfg(feature = "general_renderer")]
-mod general_renderer_groupped {
-    use serde::Serialize;
-
-    use crate::{AnyOutput, ChainProcess};
-    /// Used to mark a type with a unique enum ID, assisting dynamic dispatch
-    pub trait Groupped<Group>
+use crate::{AnyOutput, ChainProcess};
+
+/// Used to mark a type with a unique enum ID, assisting dynamic dispatch
+///
+/// **Note:** Unlike earlier versions, `Groupped` no longer requires `Serialize`
+/// even when the `general_renderer` feature is enabled. Structured output is
+/// controlled separately via the [`StructalData`] trait.
+pub trait Groupped<Group>
+where
+    Self: Sized + 'static,
+{
+    /// Returns the specific enum value representing its ID within that enum
+    fn member_id() -> Group;
+
+    /// Converts the grouped item into a `ChainProcess` directed to the chain route.
+    ///
+    /// This wraps the item into an `AnyOutput` and routes it to the chain processing pipeline.
+    fn to_chain(self) -> ChainProcess<Group>
     where
-        Self: Sized + Serialize + 'static,
+        Self: Send,
     {
-        /// Returns the specific enum value representing its ID within that enum
-        fn member_id() -> Group;
-
-        /// Converts the grouped item into a `ChainProcess` directed to the chain route.
-        ///
-        /// This wraps the item into an `AnyOutput` and routes it to the chain processing pipeline.
-        fn to_chain(self) -> ChainProcess<Group>
-        where
-            Self: Send + Serialize,
-        {
-            AnyOutput::new(self).route_chain()
-        }
-
-        /// Converts the grouped item into a `ChainProcess` directed to the render route.
-        ///
-        /// This wraps the item into an `AnyOutput` and routes it to the render processing pipeline.
-        fn to_render(self) -> ChainProcess<Group>
-        where
-            Self: Send + Serialize,
-        {
-            AnyOutput::new(self).route_renderer()
-        }
+        AnyOutput::new(self).route_chain()
     }
-}
-
-#[cfg(not(feature = "general_renderer"))]
-mod groupped {
-    use crate::{AnyOutput, ChainProcess};
 
-    /// Used to mark a type with a unique enum ID, assisting dynamic dispatch
-    pub trait Groupped<Group>
+    /// Converts the grouped item into a `ChainProcess` directed to the render route.
+    ///
+    /// This wraps the item into an `AnyOutput` and routes it to the render processing pipeline.
+    fn to_render(self) -> ChainProcess<Group>
     where
-        Self: Sized + 'static,
+        Self: Send,
     {
-        /// Returns the specific enum value representing its ID within that enum
-        fn member_id() -> Group;
-
-        /// Converts the grouped item into a `ChainProcess` directed to the chain route.
-        ///
-        /// This wraps the item into an `AnyOutput` and routes it to the chain processing pipeline.
-        fn to_chain(self) -> ChainProcess<Group>
-        where
-            Self: Send,
-        {
-            AnyOutput::new(self).route_chain()
-        }
-
-        /// Converts the grouped item into a `ChainProcess` directed to the render route.
-        ///
-        /// This wraps the item into an `AnyOutput` and routes it to the render processing pipeline.
-        fn to_render(self) -> ChainProcess<Group>
-        where
-            Self: Send,
-        {
-            AnyOutput::new(self).route_renderer()
-        }
+        AnyOutput::new(self).route_renderer()
     }
 }