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/entities/underlay.rs

@@ -7,7 +7,7 @@
 //         a PDF underlay. Rows that need the definition (name, page, path,
 //         width, height) are filled in by the Properties panel.
 
-use acadrust::entities::{Underlay, UnderlayDisplayFlags};
+use codec::entities::{Underlay, UnderlayDisplayFlags};
 use crate::t;
 use glam::DVec3;
 
@@ -20,7 +20,7 @@ use crate::scene::model::wire_model::SnapHint;
 
 // ── Helpers ───────────────────────────────────────────────────────────────────
 
-fn v3(v: &acadrust::types::Vector3) -> [f64; 3] {
+fn v3(v: &codec::types::Vector3) -> [f64; 3] {
     [v.x, v.y, v.z]
 }
 
@@ -39,16 +39,16 @@ fn cross_wire(origin: [f64; 3], size: f64) -> Vec<[f64; 3]> {
 /// The underlay's definition, when the handle resolves to one.
 pub(crate) fn definition<'a>(
     u: &Underlay,
-    document: &'a acadrust::CadDocument,
-) -> Option<&'a acadrust::entities::UnderlayDefinition> {
+    document: &'a codec::CadDocument,
+) -> Option<&'a codec::entities::UnderlayDefinition> {
     match document.objects.get(&u.definition_handle) {
-        Some(acadrust::objects::ObjectType::UnderlayDefinition(d)) => Some(d),
+        Some(codec::objects::ObjectType::UnderlayDefinition(d)) => Some(d),
         _ => None,
     }
 }
 
 /// Page number of a definition ("1" when unset).
-pub(crate) fn page_of(def: &acadrust::entities::UnderlayDefinition) -> &str {
+pub(crate) fn page_of(def: &codec::entities::UnderlayDefinition) -> &str {
     if def.page_name.trim().is_empty() {
         "1"
     } else {
@@ -58,9 +58,9 @@ pub(crate) fn page_of(def: &acadrust::entities::UnderlayDefinition) -> &str {
 
 /// Size of the referenced page in underlay units (page inches), when the
 /// definition resolves and its PDF page can be read.
-pub(crate) fn page_size(u: &Underlay, document: &acadrust::CadDocument) -> Option<(f64, f64)> {
+pub(crate) fn page_size(u: &Underlay, document: &codec::CadDocument) -> Option<(f64, f64)> {
     let def = definition(u, document)?;
-    if !matches!(def.underlay_type, acadrust::entities::UnderlayType::Pdf) {
+    if !matches!(def.underlay_type, codec::entities::UnderlayType::Pdf) {
         return None;
     }
     crate::scene::model::pdf_raster::page_size_inches(&def.file_path, page_of(def))
@@ -68,7 +68,7 @@ pub(crate) fn page_size(u: &Underlay, document: &acadrust::CadDocument) -> Optio
 
 /// The name a definition shows: its own name, or "<file> - <page>" as the
 /// reference names a PDF definition.
-pub(crate) fn definition_display_name(def: &acadrust::entities::UnderlayDefinition) -> String {
+pub(crate) fn definition_display_name(def: &codec::entities::UnderlayDefinition) -> String {
     if !def.name.trim().is_empty() {
         return def.name.clone();
     }
@@ -114,7 +114,7 @@ pub(crate) fn is_clipped(u: &Underlay) -> bool {
 }
 
 /// Page frame in world space (CCW from the insertion).
-fn page_quad(u: &Underlay, document: &acadrust::CadDocument) -> Option<[[f64; 3]; 4]> {
+fn page_quad(u: &Underlay, document: &codec::CadDocument) -> Option<[[f64; 3]; 4]> {
     let (w, h) = page_size(u, document)?;
     Some([
         local_to_world(u, [0.0, 0.0]),
@@ -126,7 +126,7 @@ fn page_quad(u: &Underlay, document: &acadrust::CadDocument) -> Option<[[f64; 3]
 
 /// Local-space extent of what is shown: the clip polygon's box when clipped
 /// to its inside, else the page.
-fn shown_local_extent(u: &Underlay, document: &acadrust::CadDocument) -> Option<(f64, f64)> {
+fn shown_local_extent(u: &Underlay, document: &codec::CadDocument) -> Option<(f64, f64)> {
     if is_clipped(u) && !u.clip_inverted {
         let clip = clip_polygon_local(u);
         let (mut lo, mut hi) = ([f64::INFINITY; 2], [f64::NEG_INFINITY; 2]);
@@ -141,7 +141,7 @@ fn shown_local_extent(u: &Underlay, document: &acadrust::CadDocument) -> Option<
 
 /// Width and height the Properties panel shows: the shown extent times the
 /// scale (the clip's size once clipped, as the reference reports it).
-pub(crate) fn shown_size(u: &Underlay, document: &acadrust::CadDocument) -> Option<(f64, f64)> {
+pub(crate) fn shown_size(u: &Underlay, document: &codec::CadDocument) -> Option<(f64, f64)> {
     shown_local_extent(u, document).map(|(w, h)| (w * u.x_scale.abs(), h * u.y_scale.abs()))
 }
 
@@ -149,7 +149,7 @@ pub(crate) fn shown_size(u: &Underlay, document: &acadrust::CadDocument) -> Opti
 /// inside, else the page frame. `None` when the page is unknown.
 pub(crate) fn world_bounds(
     u: &Underlay,
-    document: &acadrust::CadDocument,
+    document: &codec::CadDocument,
 ) -> Option<([f64; 3], [f64; 3])> {
     let outline: Vec<[f64; 3]> = if is_clipped(u) && !u.clip_inverted {
         clip_polygon_local(u).into_iter().map(|p| local_to_world(u, p)).collect()
@@ -224,7 +224,7 @@ pub(crate) fn validate_property(field: &str, value: &str) -> Result<(), &'static
 /// size itself is the page (or clip) size times the scale.
 pub(crate) fn size_to_scale(
     u: &Underlay,
-    document: &acadrust::CadDocument,
+    document: &codec::CadDocument,
     field: &str,
     value: &str,
 ) -> Option<String> {
@@ -241,7 +241,7 @@ pub(crate) fn size_to_scale(
 // ── RenderConvertible ──────────────────────────────────────────────────────────
 
 impl RenderConvertible for Underlay {
-    fn to_render(&self, document: &acadrust::CadDocument) -> Option<RenderEntity> {
+    fn to_render(&self, document: &codec::CadDocument) -> Option<RenderEntity> {
         let origin = v3(&self.insertion_point);
         let insertion_snap = (
             DVec3::new(self.insertion_point.x, self.insertion_point.y, self.insertion_point.z),
@@ -493,7 +493,7 @@ impl Transformable for Underlay {
             }
             EntityTransform::Mirror { p1, p2, working_normal } => {
                 if !working_normal.normalize_or(DVec3::Z).abs_diff_eq(DVec3::Z, 1e-10) {
-                    acadrust::Entity::apply_transform(
+                    codec::Entity::apply_transform(
                         self,
                         &crate::scene::view::transform::reflection_about_working_line(
                             *p1,
@@ -549,7 +549,7 @@ impl Transformable for Underlay {
                 self.rotation += a;
             }
             EntityTransform::Affine(transform) => {
-                acadrust::Entity::apply_transform(self, transform);
+                codec::Entity::apply_transform(self, transform);
             }
         }
     }