diff --git a/apps/solidcraft-cli/tests/straight_edges_after_cuts.rs b/apps/solidcraft-cli/tests/straight_edges_after_cuts.rs
new file mode 100644
index 00000000..a52a24a1
--- /dev/null
+++ b/apps/solidcraft-cli/tests/straight_edges_after_cuts.rs
@@ -0,0 +1,88 @@
+//! Straight edges stay one edge after many cuts (#1049). The owner's design
+//! (`tests/action_matrix/designs/crazy-geom-cuts.solidcraft`, saved by 0.10.0): five extrudes,
+//! joins and cuts, over four sketches, three of them on faces of the body with the faces'
+//! edges projected. Cuts used to leave the straight edges of the walls they sliced split at
+//! vertices nothing else used, so an edge that is one straight line was drawn (and lit on hover)
+//! as many pieces, and a sketch on such a face projected every piece.
+
+use std::collections::HashMap;
+use std::path::{Path, PathBuf};
+
+use serde_json::json;
+use solidcraft_engine::Session;
+use solidcraft_engine::doc::kernel::{FaceSurface, face_surface};
+use solidcraft_engine::geom::Vec3;
+
+fn design() -> PathBuf {
+    Path::new(env!("CARGO_MANIFEST_DIR")).join("../../tests/action_matrix/designs/crazy-geom-cuts.solidcraft")
+}
+
+fn open(path: &Path) -> Session {
+    let mut s = Session::default();
+    s.execute("doc.open", &json!({"path": path.to_string_lossy()})).unwrap_or_else(|e| panic!("{}: {e}", path.display()));
+    s
+}
+
+/// The design built from scratch: saved without cached geometry and opened again.
+fn rebuilt() -> Session {
+    let s = open(&design());
+    let dir = std::env::temp_dir().join(format!("solidcraft-straight-edges-{}", std::process::id()));
+    std::fs::create_dir_all(&dir).unwrap();
+    let path = dir.join("crazy-geom-cuts.json");
+    let mut t = s.scratch();
+    t.execute("file.save", &json!({"path": path.to_string_lossy(), "format": "json"})).unwrap();
+    let out = open(&path);
+    let _ = std::fs::remove_dir_all(&dir);
+    out
+}
+
+fn errors(s: &Session) -> Vec<(u64, String)> {
+    s.model.results.iter().filter_map(|r| r.error.clone().map(|e| (r.id, e))).collect()
+}
+
+fn key(v: Vec3) -> [i64; 3] {
+    [v.x, v.y, v.z].map(|c| (c * 1e5).round() as i64)
+}
+
+#[test]
+fn straight_edges_are_one_edge_after_many_cuts() {
+    for (what, s) in [("as saved", open(&design())), ("built from scratch", rebuilt())] {
+        assert_eq!(errors(&s), vec![], "{what}: every feature evaluates");
+        let st = s.world_state();
+        let bodies: Vec<_> = st.bodies.iter().filter(|b| !b.body.is_mesh()).collect();
+        assert_eq!(bodies.len(), 1, "{what}: one body");
+        let body = &bodies[0].body;
+        let mesh = body.tessellate(0.01).unwrap();
+        // Every edge is drawn as one polyline; a straight one as one segment.
+        let mut at: HashMap<[i64; 3], Vec<usize>> = HashMap::new();
+        for (i, e) in mesh.edges.iter().enumerate() {
+            let (Some(a), Some(z)) = (e.first(), e.last()) else { panic!("{what}: edge {i} is empty") };
+            at.entry(key(*a)).or_default().push(i);
+            at.entry(key(*z)).or_default().push(i);
+        }
+        let straight = |i: usize| mesh.edges.get(i).filter(|e| e.len() == 2).and_then(|e| (e[1] - e[0]).normalized());
+        let split: Vec<_> = at
+            .iter()
+            .filter(|(_, es)| match es.as_slice() {
+                [a, b] => straight(*a).zip(straight(*b)).is_some_and(|(u, w)| u.dot(w).abs() > 1. - 1e-9),
+                _ => false,
+            })
+            .map(|(k, _)| k.map(|c| c as f64 / 1e5))
+            .collect();
+        assert_eq!(split, Vec::<[f64; 3]>::new(), "{what}: straight edges split where nothing else meets them");
+        // No two faces side by side in one plane.
+        let plane = |f: usize| match face_surface(body, f) {
+            Some(FaceSurface::Plane { normal, point }) => Some((normal, normal.dot(point))),
+            _ => None,
+        };
+        for (i, faces) in mesh.edge_faces.iter().enumerate() {
+            if let [a, b] = faces.as_slice()
+                && a != b
+                && let (Some((na, da)), Some((nb, db))) = (plane(*a as usize), plane(*b as usize))
+            {
+                assert!(na.dot(nb) < 1. - 1e-9 || (da - db).abs() > 1e-6, "{what}: faces {a} and {b} meet at edge {i} in one plane");
+            }
+        }
+        assert_eq!((body.face_count(), body.edge_count(), body.vertex_count()), (35, 107, 71), "{what}: faces, edges and vertices");
+    }
+}
diff --git a/crates/kernel/src/heal.rs b/crates/kernel/src/heal.rs
index 20a93e58..ee1b4259 100644
--- a/crates/kernel/src/heal.rs
+++ b/crates/kernel/src/heal.rs
@@ -318,12 +318,13 @@ fn merge_collinear(shell: &mt::Shell, trace: &mut Trace) -> Option<mt::Shell> {
                     es.push(e.clone());
                     continue;
                 };
-                // The run's pieces become its joined edge, in this wire's direction.
-                if done.insert(r)
-                    && let Some((line, pos)) = joined.get(r)
-                {
+                // The run's pieces become its joined edge, in this wire's direction: once each
+                // way, as a seam runs along its wire both ways.
+                if let Some((line, pos)) = joined.get(r) {
                     let forward = pos.get(&e.front().id()) < pos.get(&e.back().id());
-                    es.push(if forward { line.clone() } else { line.inverse() });
+                    if done.insert((r, forward)) {
+                        es.push(if forward { line.clone() } else { line.inverse() });
+                    }
                 }
             }
             wires.push(mt::Wire::from(es));
@@ -547,9 +548,9 @@ pub(crate) fn heal_traced(solid: Solid, size: f64, keep: &[Vec<Vec3>]) -> (Solid
     healed(solid, size, keep, true, false)
 }
 
-/// [`heal_traced`] that only merges coplanar neighbouring faces, leaving every edge, curve and
-/// surface as it is: for results whose geometry is already exact (a prism boolean's), where
-/// joining edges would change more than the faces split in pieces.
+/// [`heal_traced`] that only merges coplanar neighbouring faces and joins the straight edges
+/// they leave split in line (#1049), leaving every curve and surface as it is: for results
+/// whose geometry is already exact (a prism boolean's).
 pub(crate) fn merge_faces_traced(solid: Solid, size: f64, keep: &[Vec<Vec3>]) -> (Solid, Option<HealMap>) {
     healed(solid, size, keep, true, true)
 }
@@ -632,7 +633,9 @@ fn heal_shells(solid: &Solid, size: f64, keep: &[Vec<Vec3>], traced: bool, faces
             from = groups.iter().map(|g| g.iter().filter_map(|i| from.get(*i)).flatten().copied().collect()).collect();
             changed = true;
         }
-        if !faces_only && let Some(m) = merge_collinear(&cur, &mut trace) {
+        // Straight edges the merged pieces leave split at vertices nothing else uses join
+        // into one, after any boolean (#1049): later features meet one edge, not the pieces.
+        if let Some(m) = merge_collinear(&cur, &mut trace) {
             cur = m;
             changed = true;
         }
diff --git a/crates/kernel/src/untouched_faces_tests.rs b/crates/kernel/src/untouched_faces_tests.rs
index 39737565..a1e06bd0 100644
--- a/crates/kernel/src/untouched_faces_tests.rs
+++ b/crates/kernel/src/untouched_faces_tests.rs
@@ -148,3 +148,66 @@ fn random_cuts_and_joins_never_split_other_faces() {
         }
     }
 }
+
+/// The edges of `b` lying along the line through `a` and `z`.
+fn edges_along(b: &Body, a: Vec3, z: Vec3) -> usize {
+    let on = |p: Vec3| p.dist_to_segment(a, z) < 1e-6;
+    let edges: std::collections::HashSet<_> = b
+        .solid
+        .edge_iter()
+        .filter(|e| on(crate::body::from_p3(e.front().point())) && on(crate::body::from_p3(e.back().point())))
+        .map(|e| e.id())
+        .collect();
+    edges.len()
+}
+
+/// Vertices of `b` where just two straight edges meet in line (a straight edge split in two).
+fn stations(b: &Body) -> usize {
+    use std::collections::HashMap;
+    let mut at: HashMap<truck_modeling::VertexID, Vec<truck_modeling::Edge>> = HashMap::new();
+    let mut seen = std::collections::HashSet::new();
+    for e in b.solid.edge_iter() {
+        if seen.insert(e.id()) {
+            for v in [e.front(), e.back()] {
+                at.entry(v.id()).or_default().push(e.clone());
+            }
+        }
+    }
+    at.values()
+        .filter(|es| match es.as_slice() {
+            [a, b] => {
+                let dir = |e: &truck_modeling::Edge| (crate::body::from_p3(e.back().point()) - crate::body::from_p3(e.front().point())).normalized();
+                matches!((a.curve(), b.curve()), (truck_modeling::Curve::Line(_), truck_modeling::Curve::Line(_)))
+                    && dir(a).zip(dir(b)).is_some_and(|(u, w)| u.dot(w).abs() > 1. - 1e-9)
+            }
+            _ => false,
+        })
+        .count()
+}
+
+/// Cuts at several heights through a block's walls leave no vertices along its straight edges
+/// (#1049): the edges they never touch stay one edge each, and so does an edge a later join
+/// lies beside, instead of being drawn (and met by later features) as many pieces.
+#[test]
+fn cuts_leave_straight_edges_whole() {
+    let mut b = box_solid(Vec3::new(0., 0., 0.), Vec3::new(40., 20., 10.)).unwrap().with_box_certificate(7).unwrap();
+    // Notches through the front wall at different heights, a pocket in the top and a slot
+    // through the end: each cut is sliced at its own heights.
+    b = cut(&b, Vec3::new(5., -1., 2.), Vec3::new(10., 3., 4.));
+    b = cut(&b, Vec3::new(15., -1., 5.), Vec3::new(20., 3., 8.));
+    b = cut(&b, Vec3::new(25., 8., 6.), Vec3::new(30., 12., 11.));
+    b = cut(&b, Vec3::new(37., 5., 3.), Vec3::new(41., 15., 7.));
+    assert!(b.history().is_some(), "the cuts report their history");
+    assert_eq!(stations(&b), 0, "a straight edge is split at a vertex nothing else uses");
+    // The block's four upright edges and the top's far edges are one edge each.
+    for (x, y) in [(0., 0.), (40., 0.), (0., 20.), (40., 20.)] {
+        assert_eq!(edges_along(&b, Vec3::new(x, y, 0.), Vec3::new(x, y, 10.)), 1, "upright edge at ({x}, {y})");
+    }
+    assert_eq!(edges_along(&b, Vec3::new(0., 20., 10.), Vec3::new(40., 20., 10.)), 1, "the top's back edge");
+    assert_eq!(edges_along(&b, Vec3::new(0., 0., 0.), Vec3::new(0., 20., 0.)), 1, "the bottom's left edge");
+    // A boss joined on the top beside its back edge, then another cut: still one edge.
+    b = boolean(&b, &box_solid(Vec3::new(2., 15., 10.), Vec3::new(8., 20., 14.)).unwrap(), BoolOp::Union).unwrap().unwrap();
+    b = cut(&b, Vec3::new(12., 4., 1.), Vec3::new(14., 21., 9.));
+    assert_eq!(stations(&b), 0, "after a join and another cut");
+    assert_eq!(edges_along(&b, Vec3::new(0., 0., 0.), Vec3::new(0., 0., 10.)), 1, "upright edge after a join and a cut");
+}
diff --git a/crates/sketch/src/link.rs b/crates/sketch/src/link.rs
index 89bfb1cf..005578d4 100644
--- a/crates/sketch/src/link.rs
+++ b/crates/sketch/src/link.rs
@@ -356,6 +356,44 @@ fn same_geometry(a: &[(LCurve, Vec<Vec2>)], b: &[(LCurve, Vec<Vec2>)]) -> bool {
 }
 
 /// The point indices a layout curve uses, in order.
+/// Is `fresh` the boundary `old` was, with only the stations along its straight lines gone
+/// (#1049: straight edges that booleans left split at vertices nothing else used are now one
+/// edge)? Every old line lies along exactly one fresh line and the old pieces cover it end to
+/// end; every other curve is unchanged. A link saved with the stations keeps its pieces then:
+/// the region they bound is the same, and the features that name them by id still find them.
+fn only_stations_gone(old: &[(LCurve, Vec<Vec2>)], fresh: &[(LCurve, Vec<Vec2>)]) -> bool {
+    const TOL: f64 = 1e-6;
+    let is_line = |c: &&(LCurve, Vec<Vec2>)| matches!(c.0, LCurve::Line(..));
+    let ends = |c: &(LCurve, Vec<Vec2>)| match c.1.as_slice() {
+        [a, b] => Some((*a, *b)),
+        _ => None,
+    };
+    let (old_lines, old_rest): (Vec<_>, Vec<_>) = old.iter().partition(is_line);
+    let (fresh_lines, fresh_rest): (Vec<_>, Vec<_>) = fresh.iter().partition(is_line);
+    if fresh_lines.len() >= old_lines.len() || old_lines.len() > 512 {
+        return false;
+    }
+    let rest = |xs: Vec<&(LCurve, Vec<Vec2>)>| xs.into_iter().cloned().collect::<Vec<_>>();
+    if !same_geometry(&rest(old_rest), &rest(fresh_rest)) {
+        return false;
+    }
+    let Some(fresh_segs) = fresh_lines.iter().map(|c| ends(c)).collect::<Option<Vec<_>>>() else { return false };
+    let mut covered = vec![0.0; fresh_segs.len()];
+    for c in &old_lines {
+        let Some((p, q)) = ends(c) else { return false };
+        let on = |x: Vec2, (a, b): (Vec2, Vec2)| {
+            let ab = b - a;
+            let t = ((x - a).dot(ab) / ab.dot(ab).max(f64::MIN_POSITIVE)).clamp(0.0, 1.0);
+            x.dist(a + ab * t) <= TOL * (1.0 + a.len().max(b.len()))
+        };
+        let Some(k) = fresh_segs.iter().position(|seg| on(p, *seg) && on(q, *seg)) else { return false };
+        if let Some(slot) = covered.get_mut(k) {
+            *slot += p.dist(q);
+        }
+    }
+    fresh_segs.iter().zip(&covered).all(|((a, b), len)| (a.dist(*b) - len).abs() <= TOL * (1.0 + a.len().max(b.len())))
+}
+
 fn curve_points(c: &LCurve) -> Vec<usize> {
     match *c {
         LCurve::Line(a, b) => vec![a, b],
@@ -677,9 +715,8 @@ impl Sketch {
             let lone_old: Vec<Vec2> = points.iter().filter_map(|pi| pos(*pi)).collect();
             if let (Some(old), Some(fresh)) = (old, fresh)
                 && lay.lone.is_empty()
-                && points.len() == lay.pts.len()
                 && lone_old.len() == points.len()
-                && same_geometry(&old, &fresh)
+                && (points.len() == lay.pts.len() && same_geometry(&old, &fresh) || only_stations_gone(&old, &fresh))
             {
                 return Ok(false);
             }
diff --git a/crates/sketch/src/tests.rs b/crates/sketch/src/tests.rs
index 0435ec8e..9278b4fd 100644
--- a/crates/sketch/src/tests.rs
+++ b/crates/sketch/src/tests.rs
@@ -883,3 +883,41 @@ fn exact_profiles_for_high_degree_and_cut_free_form_curves() {
     let uncut: f64 = find_profiles(&sk).iter().map(|p| p.area).sum();
     assert!((whole - uncut).abs() < 1e-6 * uncut, "{whole} vs {uncut}");
 }
+
+/// A face boundary saved with stations along its straight edges (#1049: booleans used to leave
+/// vertices nothing else used) keeps its saved pieces when the face comes back with each
+/// straight edge whole: the same region, and features that name the pieces still find them.
+#[test]
+fn projected_boundary_keeps_its_pieces_when_only_stations_go() {
+    use crate::{LinkGeom, LinkKind, LinkSource};
+    let mut sk = Sketch::new();
+    let v = Vec2::new;
+    let split = vec![
+        LinkGeom::Line(v(0.0, 0.0), v(5.0, 0.0)),
+        LinkGeom::Line(v(5.0, 0.0), v(10.0, 0.0)),
+        LinkGeom::Line(v(10.0, 0.0), v(10.0, 4.0)),
+        LinkGeom::Line(v(10.0, 4.0), v(10.0, 10.0)),
+        LinkGeom::Line(v(10.0, 10.0), v(0.0, 10.0)),
+        LinkGeom::Line(v(0.0, 10.0), v(0.0, 0.0)),
+    ];
+    let j = sk.add_link(LinkKind::Project, LinkSource::Origin, &split).unwrap();
+    let ids: Vec<String> = sk.link_curves(&j).iter().map(|c| sk.curves[*c].id.clone()).collect();
+    let whole = vec![
+        LinkGeom::Line(v(0.0, 0.0), v(10.0, 0.0)),
+        LinkGeom::Line(v(10.0, 0.0), v(10.0, 10.0)),
+        LinkGeom::Line(v(10.0, 10.0), v(0.0, 10.0)),
+        LinkGeom::Line(v(0.0, 10.0), v(0.0, 0.0)),
+    ];
+    assert!(!sk.update_link(&j, &whole).unwrap(), "only the stations went: the pieces stay");
+    let kept: Vec<String> = sk.link_curves(&j).iter().map(|c| sk.curves[*c].id.clone()).collect();
+    assert_eq!(ids, kept);
+    // A boundary that really changed is rebuilt.
+    let smaller = vec![
+        LinkGeom::Line(v(0.0, 0.0), v(8.0, 0.0)),
+        LinkGeom::Line(v(8.0, 0.0), v(8.0, 10.0)),
+        LinkGeom::Line(v(8.0, 10.0), v(0.0, 10.0)),
+        LinkGeom::Line(v(0.0, 10.0), v(0.0, 0.0)),
+    ];
+    assert!(sk.update_link(&j, &smaller).unwrap());
+    assert_eq!(sk.link_curves(&j).len(), 4);
+}
diff --git a/tests/action_matrix/designs/crazy-geom-cuts.solidcraft b/tests/action_matrix/designs/crazy-geom-cuts.solidcraft
new file mode 100644
index 00000000..f8dd8cda
Binary files /dev/null and b/tests/action_matrix/designs/crazy-geom-cuts.solidcraft differ
diff --git a/tests/robustness/goldens.json b/tests/robustness/goldens.json
index 2e1dce84..80b52fc3 100644
--- a/tests/robustness/goldens.json
+++ b/tests/robustness/goldens.json
@@ -3,22 +3,22 @@
  "seeds": {
   "0": {"area":4795.764396,"bodies":1,"edges":79,"error":null,"faces":29,"outcome":"ok","rejected":0,"shells":1,"steps":["extruded profile","hole","circular pattern","circular pattern","cut sphere","join cylinder","cut cylinder","fillet"],"unsupported":1,"volume":13466.472108},
   "1": {"area":2642.476583,"bodies":1,"edges":37,"error":null,"faces":15,"outcome":"ok","rejected":0,"shells":1,"steps":["revolved section","cut cylinder","join cylinder"],"unsupported":0,"volume":6991.559261},
-  "2": {"area":2493.96451,"bodies":1,"edges":59,"error":null,"faces":22,"outcome":"ok","rejected":0,"shells":1,"steps":["box","cut cylinder","fillet","cut sphere","rectangular pattern","cut sphere"],"unsupported":3,"volume":5020.244288},
+  "2": {"area":2522.922626,"bodies":1,"edges":36,"error":"boolean Cut: the operation failed: no result","faces":14,"outcome":"failed","rejected":1,"shells":1,"steps":["box","cut cylinder","fillet","cut sphere","rectangular pattern"],"unsupported":2,"volume":5580.088497},
   "3": {"area":6336.456143,"bodies":1,"edges":33,"error":null,"faces":13,"outcome":"ok","rejected":0,"shells":1,"steps":["box","cut box","hole","fillet","hole"],"unsupported":0,"volume":28037.146888},
-  "4": {"area":5813.939544,"bodies":1,"edges":27,"error":null,"faces":11,"outcome":"ok","rejected":0,"shells":1,"steps":["box","cut cylinder","fillet"],"unsupported":0,"volume":28462.605133},
+  "4": {"area":5810.088602,"bodies":1,"edges":27,"error":null,"faces":11,"outcome":"ok","rejected":0,"shells":1,"steps":["box","cut cylinder","fillet"],"unsupported":0,"volume":28461.628006},
   "5": {"area":1696.077144,"bodies":1,"edges":24,"error":"boolean Cut: the operation failed: no result; the operation ","faces":12,"outcome":"failed","rejected":1,"shells":1,"steps":["box","cut cylinder","hole","cut cylinder"],"unsupported":0,"volume":3520.994026},
   "6": {"area":11580.298484,"bodies":1,"edges":28,"error":"offset: a corner whose faces don't meet the same way after t","faces":13,"outcome":"failed","rejected":0,"shells":1,"steps":["box","hole","join box","join cylinder","cut cylinder","shell"],"unsupported":1,"volume":69137.260899},
-  "7": {"area":7462.861065,"bodies":3,"edges":111,"error":null,"faces":32,"outcome":"ok","rejected":0,"shells":3,"steps":["extruded profile","join box","cut cylinder","join box","circular pattern","hole"],"unsupported":0,"volume":32823.69121},
+  "7": {"area":7462.861065,"bodies":3,"edges":72,"error":null,"faces":32,"outcome":"ok","rejected":0,"shells":3,"steps":["extruded profile","join box","cut cylinder","join box","circular pattern","hole"],"unsupported":0,"volume":32823.69121},
   "8": {"area":2865.472237,"bodies":1,"edges":24,"error":null,"faces":10,"outcome":"ok","rejected":0,"shells":1,"steps":["revolved section","cut cylinder"],"unsupported":0,"volume":10024.247951},
   "9": {"area":2434.461263,"bodies":1,"edges":38,"error":"lumps: shell boundaries intersect or touch; cavity ownership","faces":17,"outcome":"failed","rejected":0,"shells":2,"steps":["revolved section","chamfer","fillet","join box","cut sphere","rectangular pattern","rectangular pattern","cut box"],"unsupported":4,"volume":6547.123554},
   "10": {"area":2786.620097,"bodies":1,"edges":44,"error":null,"faces":18,"outcome":"ok","rejected":1,"shells":1,"steps":["revolved section","cut box","chamfer","hole"],"unsupported":0,"volume":6668.9804},
   "11": {"area":7858.300481,"bodies":1,"edges":33,"error":null,"faces":13,"outcome":"ok","rejected":0,"shells":1,"steps":["extruded profile","hole","rectangular pattern","fillet"],"unsupported":0,"volume":34605.048259},
-  "12": {"area":4668.664174,"bodies":2,"edges":62,"error":null,"faces":25,"outcome":"ok","rejected":0,"shells":2,"steps":["extruded profile","chamfer","join cylinder","join box","cut cylinder","circular pattern"],"unsupported":3,"volume":11874.471611},
-  "13": {"area":1857.434638,"bodies":4,"edges":78,"error":null,"faces":34,"outcome":"ok","rejected":1,"shells":4,"steps":["revolved section","cut cylinder","join box","rectangular pattern","cut cylinder","cut box","fillet","hole"],"unsupported":0,"volume":2300.91061},
-  "14": {"area":10553.267698,"bodies":1,"edges":43,"error":null,"faces":20,"outcome":"ok","rejected":0,"shells":1,"steps":["extruded profile","cut cylinder","shell","fillet"],"unsupported":0,"volume":10369.009813},
+  "12": {"area":4668.664174,"bodies":2,"edges":59,"error":null,"faces":25,"outcome":"ok","rejected":0,"shells":2,"steps":["extruded profile","chamfer","join cylinder","join box","cut cylinder","circular pattern"],"unsupported":3,"volume":11874.471611},
+  "13": {"area":1857.434638,"bodies":4,"edges":75,"error":null,"faces":34,"outcome":"ok","rejected":1,"shells":4,"steps":["revolved section","cut cylinder","join box","rectangular pattern","cut cylinder","cut box","fillet","hole"],"unsupported":0,"volume":2300.91061},
+  "14": {"area":10553.267409,"bodies":1,"edges":43,"error":null,"faces":20,"outcome":"ok","rejected":0,"shells":1,"steps":["extruded profile","cut cylinder","shell","fillet"],"unsupported":0,"volume":10369.008764},
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+  "93": {"area":7266.404017,"bodies":7,"edges":111,"error":null,"faces":51,"outcome":"ok","rejected":0,"shells":7,"steps":["extruded profile","fillet","chamfer","join box","circular pattern","rectangular pattern","cut cylinder"],"unsupported":0,"volume":12734.393171},
+  "94": {"area":3505.055926,"bodies":1,"edges":73,"error":null,"faces":27,"outcome":"ok","rejected":1,"shells":1,"steps":["revolved section","cut cylinder","hole","rectangular pattern","cut box","cut box","join box"],"unsupported":1,"volume":5900.505082},
+  "95": {"area":2425.131626,"bodies":1,"edges":19,"error":"boolean Cut: the operation failed: no result; the operation ","faces":9,"outcome":"failed","rejected":0,"shells":1,"steps":["revolved section","hole","fillet","cut cylinder","cut sphere"],"unsupported":0,"volume":7106.301922}
  },
  "notes": [
   {"reason":"First record: what each seed builds on main at 1a0100cd","seeds":[0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95]},
@@ -113,6 +113,7 @@
   {"reason":"main's fillet changes since the last record (#926, #949) move seeds 33 and 91: a fillet step builds differently or is picked differently","seeds":[33,91]},
   {"reason":"hole tangent inside a stepped boss: touching sews split zero-thickness curved walls, so a pattern of holes spaced by their diameter (touching) in a stepped body cuts exactly instead of by a tool nudge: 42 builds more faces (the walls split where the holes touch), 51 picks other edges afterwards","seeds":[42,51]},
   {"reason":"corner blends on curved faces (#854): seed 33's last fillet (its second body) is built differently; its display-plan and measured volumes now agree (4442.73 mm³; on main they read 4439.42 and 4443.51)","seeds":[33]},
-  {"reason":"#952: a hole placed on a face drills into the material; seed 81's hole moves its volume by 0.1 mm\u00b3 (area by 0.04 mm\u00b2)","seeds":[81]}
+  {"reason":"#952: a hole placed on a face drills into the material; seed 81's hole moves its volume by 0.1 mm³ (area by 0.04 mm²)","seeds":[81]},
+  {"reason":"Cuts join the straight edges they used to leave split along untouched walls (#1049). Replaying each changed seed's new commands on the build before and after gives the same volume, area and faces at every step, and the same refusals (seeds 2 and 95 end on a cut the old build refuses too), except: seed 94's final join was 1.7 mm³ too large before (the box adds 875 − 2.5 × 97.967 = 630.08 mm³ to 5270.48; now 5900.56, before 5902.27), and seed 71's hole differs only in the coarse measuring mesh (identical at 2e-4 mm). Every other volume change is the generator picking other edges by index for fillets and chamfers, some of which are now accepted; seed 71's join now builds.","seeds":[2,4,7,12,13,17,25,31,38,42,45,51,52,56,65,67,69,71,72,74,82,93,94,95]}
  ]
 }