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 <[email protected]>

src/entities/text_support.rs

@@ -1,5 +1,5 @@
-use acadrust::types::aci_table::aci_to_rgb;
-use acadrust::CadDocument;
+use codec::types::aci_table::aci_to_rgb;
+use codec::CadDocument;
 
 use crate::scene::convert::acad_to_render::{GlyphRun, TextStroke};
 use crate::scene::text::font_face::Face;
@@ -488,24 +488,24 @@ fn font_stem(name: &str) -> String {
         .to_string()
 }
 
-/// Parse an MTEXT string into the layout's `Vec<MTextLine>`, using acadrust's
+/// Parse an MTEXT string into the layout's `Vec<MTextLine>`, using opencadcodec's
 /// structured `mtext_format::parse_mtext` — OCS keeps only the layout engine
 /// (`layout_mtext` and callers read `MTextLine`/`RunState`), not a second MTEXT
 /// inline parser.
 ///
 /// Representation notes:
-///  - DXF `%%d`/`%%p`/`%%c` arrive already resolved to Unicode from acadrust;
+///  - DXF `%%d`/`%%p`/`%%c` arrive already resolved to Unicode from opencadcodec;
 ///    the stroke tokenizer treats those as ordinary glyphs.
 ///  - Stacking (`\S`) is flattened inline to `num<sep>den` (`^` for limit, else
 ///    `/`) since the stroke path has no fraction layout.
 ///  - `\H`: a relative factor (`\Hx`) applies directly; an absolute height is
-///    divided by the entity height. See `acadrust::…::MTextScalar`.
+///    divided by the entity height. See `codec::…::MTextScalar`.
 pub fn adapt_mtext_paragraphs(
     s: &str,
     entity_height: f32,
     trim_blank_edges: bool,
 ) -> Vec<MTextLine> {
-    use acadrust::entities::mtext_format::{
+    use codec::entities::mtext_format::{
         parse_mtext, MTextColor, MTextLineAlignment, MTextLineSpacing, MTextParagraphAlignment,
         MTextScalar, ParagraphProperties, SpanProperties, StackingType,
     };
@@ -598,7 +598,7 @@ pub fn adapt_mtext_paragraphs(
                         .tab_stops
                         .iter()
                         .map(|ts| {
-                            use acadrust::entities::mtext_format::TabStop as ATab;
+                            use codec::entities::mtext_format::TabStop as ATab;
                             let kind = match ts {
                                 ATab::Left(_) => TabKind::Left,
                                 ATab::Center(_) => TabKind::Center,
@@ -719,7 +719,7 @@ pub fn adapt_mtext_paragraphs(
 // `measure_mtext_chars`, `word_wrap`) were removed when every text-bearing
 // entity switched to the run-aware pipeline below. The pipeline now owns
 // per-run width measurement and word-wrap; MTEXT inline parsing now comes from
-// acadrust via `adapt_mtext_paragraphs`. The supported surface for callers is
+// opencadcodec via `adapt_mtext_paragraphs`. The supported surface for callers is
 // `adapt_mtext_paragraphs`, `layout_mtext`, `mtext_line_count`,
 // `text_local_bounds`, and `resolve_dxf_special_chars`.
 
@@ -733,7 +733,7 @@ pub fn adapt_mtext_paragraphs(
 // it carries inline codes).
 //
 // The pipeline mirrors the MTEXT renderer:
-//   1. Parse — via `adapt_mtext_paragraphs` (acadrust `parse_mtext`).
+//   1. Parse — via `adapt_mtext_paragraphs` (opencadcodec `parse_mtext`).
 //   2. Atomise — turn each MTextLine.runs into a flat sequence of atoms
 //      (Word / Space / Tab) so the wrapper operates at break boundaries
 //      while keeping per-character formatting state.
@@ -1431,7 +1431,7 @@ pub fn layout_mtext(opts: &MTextRenderOpts) -> MTextLayout {
                                     char_offset: word_start,
                                 });
                             }
-                            // A literal tab (acadrust keeps `^I` / `\t` as a tab
+                            // A literal tab (opencadcodec keeps `^I` / `\t` as a tab
                             // char in the span) advances to the paragraph's next
                             // tab stop, aligning the field that follows it.
                             atoms.push(LayoutAtom {
@@ -2822,7 +2822,7 @@ mod adapter_tests {
     #[test]
     fn relative_height_is_a_factor() {
         // `\H2x;` multiplies the current height → height_mul 2.0, independent of
-        // the entity height. (This is the case that needed acadrust's MTextScalar.)
+        // the entity height. (This is the case that needed opencadcodec's MTextScalar.)
         let (_, st) = first_run(&adapt_mtext_paragraphs("\\H2x;big", 2.5, true));
         assert!((st.height_mul - 2.0).abs() < 1e-4, "got {}", st.height_mul);
     }