Cargo: codec e023bc3 (acadrust sync), kernel abca4e8, graph c63556f

The codec now holds wide EntityType variants boxed (MText, Helix,
Dimension, Hatch, Viewport, MultiLeader, Surface, Table, Ole2Frame,
Light, Extended). Constructors box their entity; nested patterns reach
a dimension through entities::dimension::as_dimension(_mut). Also
follows BlockAction::action_ids, LineTypeComplexData::source_flags and
the decimal tab stop with an explicit character.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

plugins/opencad-python/examples/create_layout_fixture.rs

@@ -41,7 +41,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
         viewport.twist_angle = std::f64::consts::FRAC_PI_2;
         viewport.view_target = Vector3::new(5.0, 10.0, 0.0);
     }
-    document.add_entity_to_layout(EntityType::Viewport(viewport), "Sheet")?;
+    document.add_entity_to_layout(EntityType::Viewport(Box::new(viewport)), "Sheet")?;
 
     let mut file = std::fs::OpenOptions::new()
         .write(true)