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/io/ole_embed.rs

@@ -4,21 +4,21 @@
 // so a drawing copied to another machine loses its pictures. An OLE2FRAME
 // instead carries the encoded raster inside an OLE compound file embedded in
 // the entity data, so
-// the .dwg is self-contained. cadcodec both builds the compound storage and
+// the .dwg is self-contained. opencadcodec both builds the compound storage and
 // reads it back, and the renderer already paints OLE2FRAMEs via
 // ImageModel::from_ole2frame, so this module only packs and unpacks.
 
 use std::io::Write as _;
 use std::path::Path;
 
-use acadrust::compound_file::{
+use codec::compound_file::{
     BinaryRecord, CompoundEntry, CompoundFile, CompoundStorage, CompoundStream,
     CompoundStreamContent, StructuredStoragePayload,
 };
-use acadrust::entities::{Ole2Frame, OleFrameEnvelope, OleObjectType};
-use acadrust::types::Vector3;
+use codec::entities::{Ole2Frame, OleFrameEnvelope, OleObjectType};
+use codec::types::Vector3;
 
-/// OLE compound-file stream holding OLE 1.0 native data. cadcodec's
+/// OLE compound-file stream holding OLE 1.0 native data. opencadcodec's
 /// presentation extractor looks here first; the body is the encoded raster
 /// behind a 4-byte little-endian length.
 const OLE10NATIVE: &str = "\u{1}Ole10Native";
@@ -109,7 +109,7 @@ pub fn corners_from_placement(origin: Vector3, width: f64, aspect: f64) -> (Vect
 
 /// Pack `image` into an OLE2FRAME spanning `upper_left` → `lower_right` in
 /// world space. The picture rides in an `\x01Ole10Native` stream as OLE 1.0
-/// native data behind the geometry envelope cadcodec writes around it.
+/// native data behind the geometry envelope opencadcodec writes around it.
 pub fn build_embedded_ole(
     image: &EmbeddedImage,
     upper_left: Vector3,
@@ -161,14 +161,14 @@ pub fn build_embedded_ole(
 /// Non-interactive embed used by the control API: add the entity to `doc` and
 /// return its handle. The undo snapshot is the caller's responsibility.
 pub fn add_embedded_image(
-    doc: &mut acadrust::CadDocument,
+    doc: &mut codec::CadDocument,
     image: &EmbeddedImage,
     origin: Vector3,
     width: f64,
-) -> Result<acadrust::Handle, String> {
+) -> Result<codec::Handle, String> {
     let (upper_left, lower_right) = corners_from_placement(origin, width, image.aspect());
     let ole = build_embedded_ole(image, upper_left, lower_right);
-    doc.add_entity(acadrust::EntityType::Ole2Frame(ole))
+    doc.add_entity(codec::EntityType::Ole2Frame(ole))
         .map_err(|e| e.to_string())
 }
 
@@ -218,8 +218,8 @@ mod tests {
             Vector3::new(4.0, 0.0, 0.0),
         );
         let payload = ole.encoded_payload();
-        match acadrust::entities::extract_presentation(&payload) {
-            Some(acadrust::entities::OlePresentation::Raster(bytes)) => assert_eq!(bytes, png),
+        match codec::entities::extract_presentation(&payload) {
+            Some(codec::entities::OlePresentation::Raster(bytes)) => assert_eq!(bytes, png),
             other => panic!("expected the embedded raster back, got {other:?}"),
         }
     }
@@ -233,28 +233,28 @@ mod tests {
             pixel_height: 3,
             name: "t.png".into(),
         };
-        let mut doc = acadrust::CadDocument::new();
+        let mut doc = codec::CadDocument::new();
         let handle =
             add_embedded_image(&mut doc, &image, Vector3::new(10.0, 10.0, 0.0), 20.0).unwrap();
 
         let dir = std::env::temp_dir().join("ocs_ole_embed_tests");
         std::fs::create_dir_all(&dir).unwrap();
         let path = dir.join("embedded_roundtrip.dwg");
-        acadrust::DwgWriter::write_to_file(&path, &doc).unwrap();
+        codec::DwgWriter::write_to_file(&path, &doc).unwrap();
 
-        let mut reader = acadrust::io::dwg::DwgReader::from_file(&path).unwrap();
+        let mut reader = codec::io::dwg::DwgReader::from_file(&path).unwrap();
         let reopened = reader.read().unwrap();
         std::fs::remove_file(&path).ok();
 
         let ole = match reopened.get_entity(handle) {
-            Some(acadrust::EntityType::Ole2Frame(ole)) => ole,
+            Some(codec::EntityType::Ole2Frame(ole)) => ole,
             other => panic!("expected the Ole2Frame back, got {other:?}"),
         };
         // Corners survive: 20 wide at aspect 4:3 → 15 tall, base at (10,10).
         assert_eq!(ole.lower_right_corner, Vector3::new(30.0, 10.0, 0.0));
         assert_eq!(ole.upper_left_corner, Vector3::new(10.0, 25.0, 0.0));
-        match acadrust::entities::extract_presentation(&ole.encoded_payload()) {
-            Some(acadrust::entities::OlePresentation::Raster(bytes)) => assert_eq!(bytes, png),
+        match codec::entities::extract_presentation(&ole.encoded_payload()) {
+            Some(codec::entities::OlePresentation::Raster(bytes)) => assert_eq!(bytes, png),
             other => panic!("expected the embedded raster back, got {other:?}"),
         }
     }