Convert the node catalog to rank-polymorphic Item and List kernels, materialize stored values as ranked wires, and display wire rank in the graph

node-graph/nodes/brush/src/brush.rs

@@ -458,6 +458,7 @@ pub fn blend_stamp_closure(foreground: BrushStampGenerator<Color>, mut backgroun
 #[cfg(test)]
 mod test {
 	use super::*;
+	use crate::brush_stroke::BrushStroke;
 	use core_types::transform::Transform;
 	use glam::DAffine2;
 

node-graph/nodes/brush/src/brush_stroke.rs

@@ -1,6 +1,7 @@
 use core_types::CacheHash;
 use core_types::blending::BlendMode;
 use core_types::color::Color;
+use core_types::list::{Item, List};
 use core_types::math::bbox::AxisAlignedBbox;
 use dyn_any::DynAny;
 use glam::DVec2;
@@ -57,6 +58,22 @@ pub struct BrushStroke {
 	pub trace: Vec<BrushInputSample>,
 }
 
+/// One Brush layer's full sequence of strokes, treated as a single rank-0 value rather than a frame of independent strokes.
+#[derive(Default, Debug, Clone, PartialEq, CacheHash, DynAny)]
+pub struct BrushTrace(pub List<BrushStroke>);
+
+impl From<List<BrushStroke>> for BrushTrace {
+	fn from(strokes: List<BrushStroke>) -> Self {
+		Self(strokes)
+	}
+}
+
+impl From<Vec<BrushStroke>> for BrushTrace {
+	fn from(strokes: Vec<BrushStroke>) -> Self {
+		Self(strokes.into_iter().map(Item::new_from_element).collect())
+	}
+}
+
 impl BrushStroke {
 	pub fn bounding_box(&self) -> AxisAlignedBbox {
 		let radius = self.style.diameter / 2.;