Rebase fixes: one helix re-export, a closing brace lost in tests.rs

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

crates/engine/src/cmd/surface.rs

@@ -146,11 +146,7 @@ mod tests {
         assert!((v - 240.0).abs() < 1e-9, "{v}");
         // Stitch the patch of a box's open top back on.
         run(&mut s, "solid.box", json!({"length": 10, "width": 10, "height": 10, "corner": [20, 0, 0], "body_name": "Cup"}));
-        run(
-            &mut s,
-            "surface.patch",
-            json!({"edges": [[25, 0, 10], [30, 5, 10], [25, 10, 10], [20, 5, 10]], "body": "Cup", "body_name": "Lid"}),
-        );
+        run(&mut s, "surface.patch", json!({"edges": [[25, 0, 10], [30, 5, 10], [25, 10, 10], [20, 5, 10]], "body": "Cup", "body_name": "Lid"}));
         assert!(s.world_state().body("Lid").unwrap().body.is_surface());
         assert!(s.execute("surface.thicken", &json!({"bodies": ["Nope"], "thickness": 1})).is_err());
         assert!(s.execute("surface.trim", &json!({"body": "Sheet"})).is_err());