Plastic: Boss (draft, root fillet, hole, ribs), Lip and Groove along a shelled body's rim (inside or outside edge, groove clearance), Snap Fit (cantilever arm with a catch)

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

crates/engine/src/cmd/mod.rs

@@ -17,6 +17,7 @@ mod measure_sel;
 mod section;
 pub(crate) use measure_sel::measure_items;
 mod parameters;
+mod plastic;
 mod sheet;
 mod sketch;
 mod sketch_constraints;
@@ -131,6 +132,7 @@ pub fn command_specs() -> Vec<&'static CommandSpec> {
     v.extend(features::COMMANDS.iter());
     v.extend(features_more::COMMANDS.iter());
     v.extend(sheet::COMMANDS.iter());
+    v.extend(plastic::COMMANDS.iter());
     v.extend(component::COMMANDS.iter());
     v.extend(joints::COMMANDS.iter());
     v.extend(browser::COMMANDS.iter());