Holes on round faces from the app, and Flip for holes at sketch points (#980)

* Holes on round faces from the app, one hole per pick, and Flip for holes at sketch points (#967)

The Hole dialog takes any face: a hole on a round face drills against the face's normal where it
was picked, and its arrow shows that. A round face split at its seam is picked whole, but makes
one hole where it was clicked. Holes at sketch points get Flip (saved as flip in the hole's points,
under format 18), in the command and in the dialog.

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

* Holes at sketch points show their arrow: into the part, or away with Flip (#967)

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

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

crates/engine/src/cmd/features.rs

@@ -51,7 +51,7 @@ pub static COMMANDS: &[CommandSpec] = &[
         .at("SOLID", "CREATE")
         .icon("hole")
         .key("H")
-        .params("position: [x,y,z] on a face | sketch + points: [sketch point ids] (one hole each, perpendicular to the sketch, into the material on whichever side of the sketch plane it is) | sketch alone (every sketch point: standalone points and circle centres); direction?: [x,y,z] (default: into the face, against its outward normal; one that leaves the face is mirrored into it; ignored with sketch points); diameter | thread (a tapped hole: the tap drill, major − pitch) | clearance: \"M6\" with fit?: close|normal|loose (ISO 273); depth? (default through all) | to?: [x,y,z] (To Object: drill to that face or point); type?: simple|drilled|counterbore|countersink; tip_angle?; cb_diameter?, cb_depth?; cs_diameter?, cs_angle?; thread?: \"M6\" (cosmetic)"),
+        .params("position: [x,y,z] on a face | sketch + points: [sketch point ids] (one hole each, perpendicular to the sketch, into the material on whichever side of the sketch plane it is) | sketch alone (every sketch point: standalone points and circle centres); flip?: bool (sketch points: drill to the other side); direction?: [x,y,z] (default: into the face, against its outward normal; one that leaves the face is mirrored into it; ignored with sketch points); diameter | thread (a tapped hole: the tap drill, major − pitch) | clearance: \"M6\" with fit?: close|normal|loose (ISO 273); depth? (default through all) | to?: [x,y,z] (To Object: drill to that face or point); type?: simple|drilled|counterbore|countersink; tip_angle?; cb_diameter?, cb_depth?; cs_diameter?, cs_angle?; thread?: \"M6\" (cosmetic)"),
     CommandSpec::new("solid.pipe", "Pipe", pipe)
         .at("SOLID", "CREATE")
         .icon("pipe")
@@ -1356,7 +1356,8 @@ fn hole(s: &mut Session, p: &Value) -> Result<Value> {
             let n = ss.plane.normal();
             let first =
                 ids.first().and_then(|id| ss.sketch.points.iter().find(|q| &q.id == id)).map(|q| ss.plane.to_world(q.pos)).unwrap_or_default();
-            Some((solidcraft_doc::SketchPoints { sketch, ids }, first, -n))
+            let flip = p.get("flip").and_then(Value::as_bool).unwrap_or(false);
+            Some((solidcraft_doc::SketchPoints { sketch, ids, flip }, first, -n))
         }
         _ => None,
     };