Through-all holes beside walls: a long thin tool keeps its outside out (#629)

Body::new no longer turns a long thin solid (a through-all hole's tool) inside out on the strength of a coarse mesh volume: it checks again on a fine mesh first. 79 more face.hole actions pass in the action matrix; the remaining no-result cuts stay under #559.

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

crates/kernel/src/body_lump_tests.rs

@@ -303,3 +303,19 @@ fn grouping_lumps_does_not_infer_absent_or_misaligned_sources() {
     let malformed = body.with_face_sources(Some(std::sync::Arc::new(vec![None])));
     assert!(malformed.lumps().unwrap_err().to_string().contains("face source table"));
 }
+
+/// A long thin cylinder (a through hole's tool) far from the origin, its seam turned: its
+/// vertices span only its length, so the coarse orientation mesh can give it a negative volume.
+/// It must still come out outward, or a Cut with it removes the wrong side (#559).
+#[test]
+fn a_long_thin_cylinder_comes_out_outward() {
+    use solidcraft_geom::{Loop2, Plane, Region2, Vec2, Vec3};
+    let plane = Plane::from_normal(Vec3::new(0., 24., 30.), Vec3::Z).unwrap();
+    for (lo, seam) in [(-181.0, 0.613), (-100.0, 0.613), (-10.0, 0.613), (-181.0, 0.0)] {
+        let disc = Region2 { outer: Loop2::circle_from(Vec2::ZERO, 0.5, seam), holes: vec![] };
+        let tool = crate::extrude(&plane, &[disc], lo, 0.9).unwrap().pop().unwrap();
+        let volume = tool.tessellate(0.01).unwrap().measure().volume;
+        let want = std::f64::consts::PI * 0.25 * (0.9 - lo);
+        assert!((volume - want).abs() < want * 0.02, "{lo} {seam}: {volume} vs {want}");
+    }
+}