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/object_data.rs

@@ -5,11 +5,11 @@
 //! OCS is the selected entity's semantic/property view, while the evaluated
 //! entity geometry continues through the normal render pipeline.
 
-use acadrust::objects::{
+use codec::objects::{
     AssociativeData, BlockEvalValue, DynamicBlockData, ObjectType,
     SolidHistoryNodeBase, SolidHistoryOperation,
 };
-use acadrust::{CadDocument, EntityType, Handle};
+use codec::{CadDocument, EntityType, Handle};
 
 use crate::scene::model::object::{PropSection, PropValue, Property};
 
@@ -39,16 +39,16 @@ pub fn build_cache(document: &CadDocument) -> ObjectDataCache {
             ObjectType::Associative(_) => associative_objects.push(*handle),
             ObjectType::GeoData(_) => geo_objects.push(*handle),
             ObjectType::ClassObject(value) => match &value.data {
-                acadrust::objects::ClassObjectData::LightList(list) => {
+                codec::objects::ClassObjectData::LightList(list) => {
                     ordered_lights.extend(list.lights.iter().map(|entry| entry.handle));
                 }
-                acadrust::objects::ClassObjectData::Sun(_) => sun_objects.push(*handle),
-                acadrust::objects::ClassObjectData::RenderEnvironment(_) => {
+                codec::objects::ClassObjectData::Sun(_) => sun_objects.push(*handle),
+                codec::objects::ClassObjectData::RenderEnvironment(_) => {
                     render_environments.push(*handle);
                 }
-                acadrust::objects::ClassObjectData::RenderSettings(_)
-                | acadrust::objects::ClassObjectData::MentalRayRenderSettings(_)
-                | acadrust::objects::ClassObjectData::RapidRtRenderSettings(_) => {
+                codec::objects::ClassObjectData::RenderSettings(_)
+                | codec::objects::ClassObjectData::MentalRayRenderSettings(_)
+                | codec::objects::ClassObjectData::RapidRtRenderSettings(_) => {
                     render_settings.push(*handle);
                 }
                 _ => {}
@@ -219,19 +219,19 @@ fn history_base_text(base: &SolidHistoryNodeBase) -> String {
     )
 }
 
-fn embedded_name(value: Option<&acadrust::entities::EmbeddedEntity>) -> &'static str {
+fn embedded_name(value: Option<&codec::entities::EmbeddedEntity>) -> &'static str {
     match value {
-        Some(acadrust::entities::EmbeddedEntity::Point(_)) => "Point",
-        Some(acadrust::entities::EmbeddedEntity::Line(_)) => "Line",
-        Some(acadrust::entities::EmbeddedEntity::Arc(_)) => "Arc",
-        Some(acadrust::entities::EmbeddedEntity::Circle(_)) => "Circle",
-        Some(acadrust::entities::EmbeddedEntity::Ellipse(_)) => "Ellipse",
-        Some(acadrust::entities::EmbeddedEntity::Spline(_)) => "Spline",
-        Some(acadrust::entities::EmbeddedEntity::LwPolyline(_)) => "Polyline",
-        Some(acadrust::entities::EmbeddedEntity::Region(_)) => "Region",
-        Some(acadrust::entities::EmbeddedEntity::Ray(_)) => "Ray",
-        Some(acadrust::entities::EmbeddedEntity::XLine(_)) => "XLine",
-        Some(acadrust::entities::EmbeddedEntity::Unknown { .. }) => "Unknown",
+        Some(codec::entities::EmbeddedEntity::Point(_)) => "Point",
+        Some(codec::entities::EmbeddedEntity::Line(_)) => "Line",
+        Some(codec::entities::EmbeddedEntity::Arc(_)) => "Arc",
+        Some(codec::entities::EmbeddedEntity::Circle(_)) => "Circle",
+        Some(codec::entities::EmbeddedEntity::Ellipse(_)) => "Ellipse",
+        Some(codec::entities::EmbeddedEntity::Spline(_)) => "Spline",
+        Some(codec::entities::EmbeddedEntity::LwPolyline(_)) => "Polyline",
+        Some(codec::entities::EmbeddedEntity::Region(_)) => "Region",
+        Some(codec::entities::EmbeddedEntity::Ray(_)) => "Ray",
+        Some(codec::entities::EmbeddedEntity::XLine(_)) => "XLine",
+        Some(codec::entities::EmbeddedEntity::Unknown { .. }) => "Unknown",
         None => "None",
     }
 }
@@ -1028,9 +1028,9 @@ where
 }
 
 fn class_object_section(
-    data: &acadrust::objects::ClassObjectData,
+    data: &codec::objects::ClassObjectData,
 ) -> Option<PropSection> {
-    use acadrust::objects::ClassObjectData;
+    use codec::objects::ClassObjectData;
 
     let section = match data {
         ClassObjectData::Empty => return None,
@@ -2066,9 +2066,9 @@ fn class_object_section(
 }
 
 fn semantic_property_text(
-    value: &acadrust::objects::SemanticPropertyValue,
+    value: &codec::objects::SemanticPropertyValue,
 ) -> String {
-    use acadrust::objects::SemanticPropertyValue;
+    use codec::objects::SemanticPropertyValue;
     match value {
         SemanticPropertyValue::Text(value) => preview_text(value, 512),
         SemanticPropertyValue::Bool(value) => value.to_string(),
@@ -2085,7 +2085,7 @@ fn semantic_property_text(
 fn auxiliary_object_property(
     object: &ObjectType,
 ) -> Option<Property> {
-    use acadrust::objects::DataObjectData;
+    use codec::objects::DataObjectData;
 
     let (label, value) = match object {
         ObjectType::TableContent(table) => (
@@ -2255,7 +2255,7 @@ fn auxiliary_object_property(
 
 /// Drawing-level standard object data prepared on the file-open worker.
 fn build_document_sections(document: &CadDocument) -> Vec<PropSection> {
-    use acadrust::objects::ClassObjectData;
+    use codec::objects::ClassObjectData;
 
     let mut sections = vec![PropSection {
         title: "Drawing".to_string(),