Components: occurrences with transforms (instances and Paste New copies), world placement of the model (Session::world_state for display, measure, export), active component authoring frame, move/ground/capture/revert positions, move bodies and sketches between components, rename/delete, migration of older designs

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AS5Tn3xieewUSg3uxrMVdL

crates/engine/src/cmd/sketch.rs

@@ -354,7 +354,9 @@ fn create_sketch(s: &mut Session, p: &Value) -> Result<Value> {
     let (vals, _) = s.doc.param_values();
     s.doc.resolve_plane(&vals, &plane, 0)?;
     let name = str_(p, "name");
-    let id = s.doc_mut().add_feature(FeatureKind::Sketch { plane, sketch: Sketch::new() }, name)?;
+    let mut kind = FeatureKind::Sketch { plane, sketch: Sketch::new() };
+    super::component::to_active_frame(s, &mut kind);
+    let id = s.doc_mut().add_feature(kind, name)?;
     let comp = s.active_component;
     if let Some(f) = s.doc_mut().feature_mut(id) {
         f.component = comp;