fix(dwg): keep OCS-saved drawings readable by strict readers

Re-authored constraint-group geometry dependencies carried an empty
persistent subentity id, which crashed strict readers loading the file;
they now name the whole curve with a single-edge id.

Bump codec bc350f2 (declare classes of objects added to pre-R2004
drawings), kernel e692b97, graph 37d38eb.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/scene/dwg_native_constraints.rs

@@ -1200,8 +1200,18 @@ impl Allocator<'_> {
                 },
                 class_version: 0,
                 enabled: true,
-                // Point and curve addressing lives on constraint-node data.
-                persistent_subent: AssocPersistentSubentId::default(),
+                // Point and curve addressing lives on constraint-node data;
+                // the dependency names the whole curve, as single-edge
+                // subentities do in authored constraint groups. An empty id
+                // (no class) crashes strict readers loading the drawing.
+                // ponytail: polyline segments get the single-edge id too;
+                // authored files address them with an index subentity (class
+                // code 3) whose fields are not decoded yet.
+                persistent_subent: AssocPersistentSubentId {
+                    class_name: "AcDbAssocSingleEdgePersSubentId".to_string(),
+                    class_code: 1,
+                    ..Default::default()
+                },
             }),
         )
     }