feat: node graph overlay; move to opencadcodec/opencadkernel/opencadgraph

The codec and kernel repositories and crates are renamed opencadcodec and
opencadkernel. Inside OCS they are depended on under short keys, so code
reads `codec::`, `kernel::` and the new `graph::` (opencadgraph, the node
graph engine). File-format and protocol spellings stay as they were: the
ACIS product id `acadrust`, the ACADRUST_* switches and the plugin
version keys `acadrust_version` / `acadrust_source`.

A button left of MCP on the command line opens a translucent node graph
over the viewport, with a palette of object, input, math, logic, list,
text and geometry nodes added by click or drag. An object node owns
drawing entities and its rows are the Properties panel's own rows for
them: the single-object page is extracted from refresh_properties as
entity_property_sections, values use the control protocol's
property_json, and writes go through set_property_value with a property
target override, so the panel, MCP and the graph share one read/write
path. A list reaching an object row makes one entity per element. Each
graph action is one undo step; the canvas pans and zooms.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/modules/draw/modify/splinedit.rs

@@ -9,8 +9,8 @@
 //
 // Control-point dragging is already supported via the grip editing system.
 
-use acadrust::types::Vector3;
-use acadrust::EntityType;
+use codec::types::Vector3;
+use codec::EntityType;
 use glam::DVec3;
 
 
@@ -53,16 +53,16 @@ enum Step {
 
 pub struct SplineditCommand {
     step: Step,
-    handle: acadrust::Handle,
-    spline: Option<acadrust::entities::Spline>,
-    pending: Option<acadrust::entities::Spline>,
-    history: Vec<(acadrust::Handle, acadrust::entities::Spline)>,
+    handle: codec::Handle,
+    spline: Option<codec::entities::Spline>,
+    pending: Option<codec::entities::Spline>,
+    history: Vec<(codec::Handle, codec::entities::Spline)>,
     pick_context: Option<crate::command::PointPickContext>,
     join_candidates: Vec<crate::command::SelectionEntity>,
     delete_source: bool,
 }
 
-fn clear_fit_method(spline: &mut acadrust::entities::Spline) {
+fn clear_fit_method(spline: &mut codec::entities::Spline) {
     spline.fit_points.clear();
     spline.begin_tangent = Vector3::ZERO;
     spline.end_tangent = Vector3::ZERO;
@@ -80,7 +80,7 @@ fn weights_are_rational(weights: &[f64]) -> bool {
 
 impl SplineditCommand {
     pub fn new() -> Self {
-        Self { step: Step::SelectSpline, handle: acadrust::Handle::NULL, spline: None, pending: None, history: Vec::new(), pick_context: None, join_candidates: Vec::new(), delete_source: true }
+        Self { step: Step::SelectSpline, handle: codec::Handle::NULL, spline: None, pending: None, history: Vec::new(), pick_context: None, join_candidates: Vec::new(), delete_source: true }
     }
 
     pub fn with_delete_source(mut self, delete: bool) -> Self { self.delete_source = delete; self }
@@ -97,19 +97,19 @@ impl SplineditCommand {
             if points.len() < 2 { return None; }
             let entity = if let Some(planar) = crate::entities::curve::entity_curve(&EntityType::Spline(source.clone())) {
                 let normal = planar.plane.normal()?;
-                let elevation = cadkernel::space::Vec3::from(points[0]).dot(cadkernel::space::Vec3::from(normal));
+                let elevation = kernel::space::Vec3::from(points[0]).dot(kernel::space::Vec3::from(normal));
                 let normal = Vector3::new(normal[0], normal[1], normal[2]);
                 let plane = crate::entities::curve::ocs_plane(normal.clone(), elevation);
-                let mut polyline = acadrust::LwPolyline::new();
+                let mut polyline = codec::LwPolyline::new();
                 polyline.common = source.common.clone();
                 polyline.elevation = elevation; polyline.normal = normal; polyline.is_closed = self.closed();
                 polyline.vertices = points.iter().map(|point| {
                     let uv = plane.project(*point)?;
-                    Some(acadrust::entities::LwVertex::new(acadrust::types::Vector2::new(uv[0], uv[1])))
+                    Some(codec::entities::LwVertex::new(codec::types::Vector2::new(uv[0], uv[1])))
                 }).collect::<Option<Vec<_>>>()?;
                 EntityType::LwPolyline(polyline)
             } else {
-                let mut polyline = acadrust::entities::Polyline3D::from_points(points.iter().map(|p| Vector3::new(p[0],p[1],p[2])).collect());
+                let mut polyline = codec::entities::Polyline3D::from_points(points.iter().map(|p| Vector3::new(p[0],p[1],p[2])).collect());
                 polyline.common = source.common.clone(); polyline.flags.closed = self.closed();
                 EntityType::Polyline3D(polyline)
             };
@@ -117,7 +117,7 @@ impl SplineditCommand {
         });
         let Some(mut entity) = result else { return CmdResult::ReportError(crate::t!("Spline cannot be converted within the requested precision.").into_owned()); };
         if self.delete_source { CmdResult::ReplaceMany(vec![(self.handle,vec![entity])], Vec::new()) }
-        else { entity.common_mut().handle = acadrust::Handle::NULL; CmdResult::ReplaceMany(Vec::new(), vec![entity]) }
+        else { entity.common_mut().handle = codec::Handle::NULL; CmdResult::ReplaceMany(Vec::new(), vec![entity]) }
     }
 
     fn picked_vertex(&self, point: DVec3) -> Option<usize> { self.picked_from_points(point, &self.spline.as_ref()?.control_points) }
@@ -132,7 +132,7 @@ impl SplineditCommand {
         self.rebuild_fit(result)
     }
 
-    fn rebuild_fit(&mut self, mut result: acadrust::entities::Spline) -> CmdResult {
+    fn rebuild_fit(&mut self, mut result: codec::entities::Spline) -> CmdResult {
         let Some(source) = self.spline.as_ref() else { return CmdResult::NeedPoint; };
         if source.fit_tolerance != 0.0 || source.weights.windows(2).any(|w| w[0] != w[1]) {
             return CmdResult::ReportError(crate::t!("Editing weighted or tolerance-fitted interpolation data is not supported.").into_owned());
@@ -201,7 +201,7 @@ impl SplineditCommand {
         self.spline.as_ref().is_some_and(|spline| spline.flags.closed || spline.flags.periodic)
     }
 
-    fn replace(&mut self, spline: acadrust::entities::Spline) -> CmdResult {
+    fn replace(&mut self, spline: codec::entities::Spline) -> CmdResult {
         self.pending = Some(spline.clone());
         CmdResult::ReplaceManyContinue(vec![(self.handle, vec![EntityType::Spline(spline)])])
     }
@@ -224,7 +224,7 @@ impl SplineditCommand {
         CmdResult::ReplaceManyContinue(replacements)
     }
 
-    fn refined(&self, point: Option<DVec3>, degree: Option<usize>) -> Option<acadrust::entities::Spline> {
+    fn refined(&self, point: Option<DVec3>, degree: Option<usize>) -> Option<codec::entities::Spline> {
         let source = self.spline.as_ref()?;
         if let Some(degree) = degree {
             let current = usize::try_from(source.degree).ok()?;
@@ -244,10 +244,10 @@ impl SplineditCommand {
             return Some(result);
         }
         let planar = crate::entities::curve::entity_curve(&EntityType::Spline(source.clone()))?;
-        let cadkernel::geom2d::Curve::Nurbs(mut curve) = planar.curve else { return None; };
+        let kernel::geom2d::Curve::Nurbs(mut curve) = planar.curve else { return None; };
         if let Some(point) = point {
             let projected = planar.plane.project([point.x, point.y, point.z])?;
-            let nearest = cadkernel::geom2d::closest_point(&cadkernel::geom2d::Curve::Nurbs(curve.clone()), projected);
+            let nearest = kernel::geom2d::closest_point(&kernel::geom2d::Curve::Nurbs(curve.clone()), projected);
             let (start, end) = curve.domain();
             let parameter = start + nearest.t * (end - start);
             if parameter <= start || parameter >= end { return None; }
@@ -321,7 +321,7 @@ impl CadCommand for SplineditCommand {
     fn inject_selection_entities(&mut self, entities: Vec<crate::command::SelectionEntity>) {
         if matches!(self.step, Step::Join) { self.join_candidates = entities; }
     }
-    fn on_selection_complete(&mut self, handles: Vec<acadrust::Handle>) -> CmdResult {
+    fn on_selection_complete(&mut self, handles: Vec<codec::Handle>) -> CmdResult {
         self.join_candidates.retain(|item| handles.contains(&item.handle) && item.handle != self.handle);
         CmdResult::NeedPoint
     }
@@ -330,13 +330,13 @@ impl CadCommand for SplineditCommand {
     fn inject_picked_entity(&mut self, entity: EntityType) {
         self.spline = match entity { EntityType::Spline(spline) => Some(spline), _ => None };
     }
-    fn on_entity_pick(&mut self, handle: acadrust::Handle, _pt: DVec3) -> CmdResult {
+    fn on_entity_pick(&mut self, handle: codec::Handle, _pt: DVec3) -> CmdResult {
         if handle.is_null() || self.spline.is_none() { return CmdResult::NeedPoint; }
         self.handle = handle;
         self.step = Step::Options;
         CmdResult::NeedPoint
     }
-    fn on_entity_replaced(&mut self, old: acadrust::Handle, new: &[acadrust::Handle]) {
+    fn on_entity_replaced(&mut self, old: codec::Handle, new: &[codec::Handle]) {
         if old == self.handle {
             if let (Some(&handle), Some(replacement)) = (new.first(), self.pending.take()) {
                 if let Some(previous) = self.spline.replace(replacement) { self.history.push((old, previous)); }
@@ -514,7 +514,7 @@ impl CadCommand for SplineditCommand {
                 let controls = source.control_points.iter().map(|point| [point.x, point.y, point.z]).collect();
                 let weights = if source.weights.is_empty() { vec![1.0; source.control_points.len()] }
                     else { source.weights.clone() };
-                let curve = cadkernel::space::NurbsCurve3::new_strict(source.degree as usize, controls,
+                let curve = kernel::space::NurbsCurve3::new_strict(source.degree as usize, controls,
                     source.knots.clone(), weights).map(|curve| curve.with_periodicity(source.flags.periodic || source.flags.closed));
                 let Some(curve) = curve.and_then(|curve| curve.without_control_vertex(index)) else { return CmdResult::NeedPoint; };
                 let mut spline = source.clone();
@@ -576,14 +576,14 @@ impl CadCommand for SplineditCommand {
 }
 /// Apply a spline operation (CLOSE/OPEN/REVERSE) to a spline entity.
 /// Called from `cmd_result.rs` when the ReplaceEntity sentinel is detected.
-pub fn apply_spline_op(doc: &mut acadrust::CadDocument, handle: acadrust::Handle, op: &str) {
+pub fn apply_spline_op(doc: &mut codec::CadDocument, handle: codec::Handle, op: &str) {
     let Some(EntityType::Spline(spline)) = doc.get_entity_mut(handle) else {
         return;
     };
     apply_to_spline(spline, op);
 }
 
-fn apply_to_spline(spline: &mut acadrust::entities::Spline, op: &str) {
+fn apply_to_spline(spline: &mut codec::entities::Spline, op: &str) {
     let result = match op {
         "__SPLINEDIT_CLOSE__" => change_closure(spline, true),
         "__SPLINEDIT_OPEN__" => change_closure(spline, false),
@@ -593,8 +593,8 @@ fn apply_to_spline(spline: &mut acadrust::entities::Spline, op: &str) {
     if let Some(result) = result { *spline = result; }
 }
 
-fn change_closure(source: &acadrust::entities::Spline, closed: bool) -> Option<acadrust::entities::Spline> {
-    use cadkernel::space::{NurbsCurve3, Parameterization};
+fn change_closure(source: &codec::entities::Spline, closed: bool) -> Option<codec::entities::Spline> {
+    use kernel::space::{NurbsCurve3, Parameterization};
     if (source.flags.closed || source.flags.periodic) == closed { return None; }
     let fit_method = !source.fit_points.is_empty() || source.dwg_flags1 & 1 != 0 || source.dxf_flags & 32 != 0;
     let parameterization = match source.knot_parameterization {
@@ -654,8 +654,8 @@ fn change_closure(source: &acadrust::entities::Spline, closed: bool) -> Option<a
 #[cfg(test)]
 mod tests {
     use super::*;
-    use acadrust::entities::Spline;
-    use acadrust::Handle;
+    use codec::entities::Spline;
+    use codec::Handle;
     use iced::Rectangle;
 
     fn control_spline(points: &[[f64; 3]], degree: usize) -> Spline {
@@ -665,7 +665,7 @@ mod tests {
             .iter()
             .map(|point| Vector3::new(point[0], point[1], point[2]))
             .collect();
-        spline.knots = cadkernel::space::clamped_uniform_knots(degree, points.len());
+        spline.knots = kernel::space::clamped_uniform_knots(degree, points.len());
         spline
     }
 
@@ -785,7 +785,7 @@ mod tests {
 
     #[test]
     fn a_closed_weighted_control_curve_can_be_opened() {
-        let curve = cadkernel::space::NurbsCurve3::from_weighted_control_polygon(
+        let curve = kernel::space::NurbsCurve3::from_weighted_control_polygon(
             2,
             &[
                 [0.0, 0.0, 0.0],
@@ -806,7 +806,7 @@ mod tests {
         let opened = change_closure(&spline, false).expect("closed control curve opens");
         assert!(!opened.flags.closed);
         assert!(!opened.flags.periodic);
-        assert!(cadkernel::space::NurbsCurve3::new_strict(
+        assert!(kernel::space::NurbsCurve3::new_strict(
             opened.degree as usize,
             opened
                 .control_points
@@ -888,7 +888,7 @@ mod tests {
 
     #[test]
     fn closed_conversion_closes_once_and_invalid_precision_retries() {
-        let curve = cadkernel::space::NurbsCurve3::from_control_polygon(
+        let curve = kernel::space::NurbsCurve3::from_control_polygon(
             2,
             &[
                 [0.0, 0.0, 0.0],
@@ -964,13 +964,13 @@ mod tests {
 // ── Autocomplete registry ─────────────────────────────────
 inventory::submit!(crate::command::CommandRegistration { names: &["SPLINEDIT"] });  // SplineditCommand
 
-fn spatial_spline(source: &acadrust::entities::Spline) -> Option<cadkernel::space::NurbsCurve3> {
+fn spatial_spline(source: &codec::entities::Spline) -> Option<kernel::space::NurbsCurve3> {
     let curve = if crate::entities::spline::uses_fit_method(source) {
         crate::entities::spline::fit_nurbs3(source)?
     } else {
         let current = usize::try_from(source.degree).ok()?;
         let weights = if source.weights.is_empty() { vec![1.0; source.control_points.len()] } else { source.weights.clone() };
-        cadkernel::space::NurbsCurve3::new_strict(current,
+        kernel::space::NurbsCurve3::new_strict(current,
             source.control_points.iter().map(|point| [point.x, point.y, point.z]).collect(),
             source.knots.clone(), weights)?
     };