diff --git a/crates/engine/src/cmd/motion_tests.rs b/crates/engine/src/cmd/motion_tests.rs
index e91c900a..dbf1f062 100644
--- a/crates/engine/src/cmd/motion_tests.rs
+++ b/crates/engine/src/cmd/motion_tests.rs
@@ -74,8 +74,7 @@ fn contact_sets_stop_a_driven_joint_at_touching() {
 #[test]
 fn motion_study_plays_and_exports() {
     let mut s = rail();
-    let r =
-        run(&mut s, "motion.study", json!({"name": "Push", "steps": 100, "keys": [{"joint": "Rail", "points": [[0, 10], [100, -5]]}]}));
+    let r = run(&mut s, "motion.study", json!({"name": "Push", "steps": 100, "keys": [{"joint": "Rail", "points": [[0, 10], [100, -5]]}]}));
     assert_eq!(r["keys"], 1);
     run(&mut s, "motion.play", json!({"study": "Push", "step": 50}));
     assert!((b_x(&s) - 12.5).abs() < 1e-6, "{}", b_x(&s));
diff --git a/crates/engine/src/cmd/patterns_tests.rs b/crates/engine/src/cmd/patterns_tests.rs
index 1d4e8381..09eb681e 100644
--- a/crates/engine/src/cmd/patterns_tests.rs
+++ b/crates/engine/src/cmd/patterns_tests.rs
@@ -136,7 +136,9 @@ fn patterns_of_a_blind_hole_drill_every_copy() {
     };
     let r = patterned(("solid.pattern.rectangular", json!({"features": ["Hole1"], "dir1": [1, 0, 0], "count1": 3, "spacing1": "15 mm"})));
     assert!((r - 3.0 * one).abs() < 1e-3 * one, "{r} vs 3 × {one}");
-    let c =
-        patterned(("solid.pattern.circular", json!({"features": ["Hole1"], "axis": {"origin": [25, 12, 0], "dir": [0, 0, 1]}, "count": 2, "angle": 360})));
+    let c = patterned((
+        "solid.pattern.circular",
+        json!({"features": ["Hole1"], "axis": {"origin": [25, 12, 0], "dir": [0, 0, 1]}, "count": 2, "angle": 360}),
+    ));
     assert!((c - 2.0 * one).abs() < 1e-3 * one, "{c} vs 2 × {one}");
 }
diff --git a/crates/engine/src/cmd/sketch.rs b/crates/engine/src/cmd/sketch.rs
index 92195575..5467800d 100644
--- a/crates/engine/src/cmd/sketch.rs
+++ b/crates/engine/src/cmd/sketch.rs
@@ -1076,16 +1076,24 @@ fn c_equal(s: &mut Session, p: &Value) -> Result<Value> {
     constrain(s, p, "sketch.constraint.equal", |sk| two_curves(sk, p, "sketch.constraint.equal").map(|(a, b)| ConstraintKind::Equal { a, b }))
 }
 fn c_parallel(s: &mut Session, p: &Value) -> Result<Value> {
-    constrain(s, p, "sketch.constraint.parallel", |sk| two_curves(sk, p, "sketch.constraint.parallel").map(|(a, b)| ConstraintKind::Parallel { a, b }))
+    constrain(s, p, "sketch.constraint.parallel", |sk| {
+        two_curves(sk, p, "sketch.constraint.parallel").map(|(a, b)| ConstraintKind::Parallel { a, b })
+    })
 }
 fn c_perpendicular(s: &mut Session, p: &Value) -> Result<Value> {
-    constrain(s, p, "sketch.constraint.perpendicular", |sk| two_curves(sk, p, "sketch.constraint.perpendicular").map(|(a, b)| ConstraintKind::Perpendicular { a, b }))
+    constrain(s, p, "sketch.constraint.perpendicular", |sk| {
+        two_curves(sk, p, "sketch.constraint.perpendicular").map(|(a, b)| ConstraintKind::Perpendicular { a, b })
+    })
 }
 fn c_concentric(s: &mut Session, p: &Value) -> Result<Value> {
-    constrain(s, p, "sketch.constraint.concentric", |sk| two_curves(sk, p, "sketch.constraint.concentric").map(|(a, b)| ConstraintKind::Concentric { a, b }))
+    constrain(s, p, "sketch.constraint.concentric", |sk| {
+        two_curves(sk, p, "sketch.constraint.concentric").map(|(a, b)| ConstraintKind::Concentric { a, b })
+    })
 }
 fn c_collinear(s: &mut Session, p: &Value) -> Result<Value> {
-    constrain(s, p, "sketch.constraint.collinear", |sk| two_curves(sk, p, "sketch.constraint.collinear").map(|(a, b)| ConstraintKind::Collinear { a, b }))
+    constrain(s, p, "sketch.constraint.collinear", |sk| {
+        two_curves(sk, p, "sketch.constraint.collinear").map(|(a, b)| ConstraintKind::Collinear { a, b })
+    })
 }
 fn c_midpoint(s: &mut Session, p: &Value) -> Result<Value> {
     let cmd = "sketch.constraint.midpoint";
diff --git a/crates/engine/src/cmd/sketch_constraints_tests.rs b/crates/engine/src/cmd/sketch_constraints_tests.rs
index 8149ef00..9aaf25b6 100644
--- a/crates/engine/src/cmd/sketch_constraints_tests.rs
+++ b/crates/engine/src/cmd/sketch_constraints_tests.rs
@@ -54,7 +54,8 @@ fn curvature_polygon_arc_length_linear_diameter() {
     // A horizontal line ending where a control-point spline starts: G2 keeps the spline's
     // start straight (zero curvature) and tangent.
     let l = ids(&run(&mut s, "sketch.line", json!({"points": [[-10, 0], [0, 0]], "infer": true}))["curves"])[0].clone();
-    let sp = ids(&run(&mut s, "sketch.spline.control_point", json!({"points": [format!("{l}.end"), [5, 2], [10, 6], [15, 15]]}))["curves"])[0].clone();
+    let sp =
+        ids(&run(&mut s, "sketch.spline.control_point", json!({"points": [format!("{l}.end"), [5, 2], [10, 6], [15, 15]]}))["curves"])[0].clone();
     run(&mut s, "sketch.constraint.curvature", json!({"a": l, "b": sp}));
     let sk = sketch(&s);
     let pts: Vec<Vec2> = sk.curves[sk.curve_index(&sp).unwrap()].kind.point_ids().iter().map(|i| sk.point(*i).unwrap()).collect();
diff --git a/crates/engine/src/cmd/sketch_modify_tests.rs b/crates/engine/src/cmd/sketch_modify_tests.rs
index 4417fc74..51916014 100644
--- a/crates/engine/src/cmd/sketch_modify_tests.rs
+++ b/crates/engine/src/cmd/sketch_modify_tests.rs
@@ -348,7 +348,9 @@ fn degree_five_and_cut_free_form_profiles_extrude_exactly() {
     let vol = |s: &mut Session| run(s, "inspect.measure", json!({}))["total"]["volume_mm3"].as_f64().unwrap();
     // A degree-5 control spline closed by a line: one B-spline side face.
     let mut s = new_sketch();
-    let sp = ids(&run(&mut s, "sketch.spline.control_point_5", json!({"points": [[0, 0], [4, 10], [10, 12], [16, 12], [22, 10], [26, 0]]}))["curves"])[0].clone();
+    let sp =
+        ids(&run(&mut s, "sketch.spline.control_point_5", json!({"points": [[0, 0], [4, 10], [10, 12], [16, 12], [22, 10], [26, 0]]}))["curves"])[0]
+            .clone();
     run(&mut s, "sketch.line", json!({"points": [format!("{sp}.end"), format!("{sp}.start")]}));
     let a = profiles(&s)[0];
     run(&mut s, "sketch.finish", json!({}));
@@ -427,7 +429,8 @@ fn fillet_a_line_and_an_arc() {
     let mut s = new_sketch();
     // A line into a quarter arc meeting at a sharp corner.
     let l = ids(&run(&mut s, "sketch.line", json!({"points": [[0, 0], [20, 0]]}))["curves"])[0].clone();
-    let a = ids(&run(&mut s, "sketch.arc.center_point", json!({"center": [30, 0], "start": format!("{l}.end"), "end": [30, -10]}))["curves"])[0].clone();
+    let a =
+        ids(&run(&mut s, "sketch.arc.center_point", json!({"center": [30, 0], "start": format!("{l}.end"), "end": [30, -10]}))["curves"])[0].clone();
     let _ = a;
     let f = run(&mut s, "sketch.fillet", json!({"point": format!("{l}.end"), "radius": 2}));
     let arc = ids(&f["curves"])[0].clone();
diff --git a/crates/engine/src/cmd/surface.rs b/crates/engine/src/cmd/surface.rs
index 1ba7cdeb..23ff4ada 100644
--- a/crates/engine/src/cmd/surface.rs
+++ b/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());
diff --git a/crates/engine/src/cmd/surface_analysis.rs b/crates/engine/src/cmd/surface_analysis.rs
index 20b88362..d917534d 100644
--- a/crates/engine/src/cmd/surface_analysis.rs
+++ b/crates/engine/src/cmd/surface_analysis.rs
@@ -69,9 +69,7 @@ fn draft(s: &mut Session, p: &Value) -> Result<Value> {
 
 fn accessibility(s: &mut Session, p: &Value) -> Result<Value> {
     let dir = match p.get("direction") {
-        Some(v) => {
-            vec3(v).and_then(Vec3::normalized).ok_or_else(|| bad("inspect.accessibility", "`direction` must be a non-zero [x,y,z]"))?
-        }
+        Some(v) => vec3(v).and_then(Vec3::normalized).ok_or_else(|| bad("inspect.accessibility", "`direction` must be a non-zero [x,y,z]"))?,
         None => Vec3::Z,
     };
     set(s, p, SurfaceAnalysis::Access { dir })
diff --git a/crates/engine/src/frames.rs b/crates/engine/src/frames.rs
index 2c3bc4f3..a4b2de07 100644
--- a/crates/engine/src/frames.rs
+++ b/crates/engine/src/frames.rs
@@ -61,9 +61,7 @@ fn table(id: &str) -> &'static [(&'static str, K)] {
         "sketch.intersect" => &[("refs", Picks)],
         "sketch.project_to_surface" | "sketch.isoparametric_curve" => &[("face", Pick), ("body", Body)],
         "sketch.intersection_curve" => &[("a", Picks), ("b", Picks)],
-        "inspect.curvature_comb" | "inspect.minimum_radius" | "inspect.isocurve" => {
-            &[("edges", Picks), ("faces", Picks)]
-        }
+        "inspect.curvature_comb" | "inspect.minimum_radius" | "inspect.isocurve" => &[("edges", Picks), ("faces", Picks)],
         "parts.insert" | "parts.fastener" => &[("at", Pick), ("point", Make), ("direction", Dir)],
         "appearance.assign" => &[("faces", Picks), ("bodies", Body), ("body", Body)],
         "solid.move" => &[("bodies", Body), ("translate", Dir), ("axis", Dir), ("origin", Make)],
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index 0709d741..a146668e 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -299,10 +299,7 @@ fn hostile_params_never_panic() {
     ];
     let mut internal = Vec::new();
     for spec in command_specs() {
-        if matches!(
-            spec.id,
-            "doc.open" | "file.save" | "file.save_as" | "file.export" | "file.save_mesh" | "sketch.export_dxf"
-        ) {
+        if matches!(spec.id, "doc.open" | "file.save" | "file.save_as" | "file.export" | "file.save_mesh" | "sketch.export_dxf") {
             continue; // file system side effects are covered by their own tests
         }
         for v in hostile_values() {
@@ -405,11 +402,7 @@ fn timeline_edits_reresolve_references() {
     assert_eq!(names, ["Base", "Bore", "Round"]);
     assert!(rel(volume(&mut s), expect(60.0, 25.0)) < 1e-3);
     // Redefine the fillet in place with a new radius; it keeps its name and position.
-    run(
-        &mut s,
-        "timeline.redefine",
-        json!({"feature": "Round", "command": "solid.fillet", "params": {"edges": [[30, 0, 25]], "radius": 4}}),
-    );
+    run(&mut s, "timeline.redefine", json!({"feature": "Round", "command": "solid.fillet", "params": {"edges": [[30, 0, 25]], "radius": 4}}));
     let f4 = (16.0 - 16.0 * PI / 4.0) * 60.0;
     assert!(rel(volume(&mut s), 60.0 * 30.0 * 25.0 - f4 - PI * 9.0 * 25.0) < 1e-3);
     assert_eq!(s.doc.features.iter().map(|f| f.name.as_str()).collect::<Vec<_>>(), ["Base", "Bore", "Round"]);
@@ -1117,7 +1110,11 @@ fn face_extrude_follows_edits() {
     let mut s = Session::default();
     run(&mut s, "solid.box", json!({"length": 40, "width": 30, "height": 20}));
     let before = volume(&mut s);
-    run(&mut s, "solid.revolve", json!({"face": [40, 15, 10], "axis": {"origin": [40, 0, 30], "dir": [0, 1, 0]}, "angle": "90 deg", "operation": "new"}));
+    run(
+        &mut s,
+        "solid.revolve",
+        json!({"face": [40, 15, 10], "axis": {"origin": [40, 0, 30], "dir": [0, 1, 0]}, "angle": "90 deg", "operation": "new"}),
+    );
     let added = volume(&mut s) - before;
     let want = 30.0 * 20.0 * 20.0 * PI / 2.0;
     assert!(rel(added, want) < 1e-4, "{added} vs {want}");
@@ -1622,6 +1619,8 @@ fn hole_as_deep_as_the_plate() {
         assert!(r.is_ok(), "{i} {p}: {r:?}");
         assert!(volume(&mut s) < before - 1.0, "{i} {p}");
     }
+}
+
 /// Appearances outlive later features: a coloured face keeps its colour after a fillet on a
 /// neighbouring edge; an imported STEP's body and face colours survive a hole.
 #[test]
@@ -1779,8 +1778,7 @@ fn combine_keep_tools_and_new_component() {
     let mut s = Session::default();
     run(&mut s, "solid.box", json!({"length": 20, "width": 20, "height": 20, "body_name": "A"}));
     run(&mut s, "solid.box", json!({"corner": [10, 0, 0], "length": 20, "width": 20, "height": 20, "body_name": "B"}));
-    let r =
-        run(&mut s, "solid.combine", json!({"target": "A", "tools": ["B"], "operation": "cut", "keep_tools": true, "new_component": true}));
+    let r = run(&mut s, "solid.combine", json!({"target": "A", "tools": ["B"], "operation": "cut", "keep_tools": true, "new_component": true}));
     let comp = r["component"].as_u64().unwrap_or(0);
     assert!(comp > 0, "{r}");
     let st = s.model.state();
diff --git a/crates/kernel/src/lib.rs b/crates/kernel/src/lib.rs
index 9ba4bf27..82654461 100644
--- a/crates/kernel/src/lib.rs
+++ b/crates/kernel/src/lib.rs
@@ -51,7 +51,6 @@ pub use blend_variable::{fillet_chord, fillet_variable};
 pub use body::{Body, EdgeInfo, FaceInfo, FacePaint, Paint};
 pub use build::{PathSeg, box_solid, cylinder, extrude, extrude_tapered, loft, revolve, sphere, sweep, torus};
 pub use delete_face::delete_faces;
-pub use helix::{loft_to_point, sweep_helix};
 pub use helix::{loft_to_point, sweep_helix, sweep_helix_mesh};
 pub use iges_in::{MAX_IGES_BYTES, iges_import, iges_to_step};
 pub use iges_out::iges_export_bodies;