fix(posts): never post a display perimeter

The posts treat every non-lead feed move as a cut, so an applied blank's
display tail, or the outline of a blank posted without a plan, would have
been cut along the blank's edge. The pre-post review counted that outline
as an ordinary cutting contour.

Cincinnati, CI Fiber and the engraver now read part programs through
DisplayPerimeterTail.ForPosting: an applied program posts exactly what the
same program posts with its tail removed by hand, and an unplanned display
perimeter is refused with a message that names the part and points to Plan
Cutting. The pre-post review reports the unplanned outline by name.

Posts/OpenNest.Posts.Cincinnati/CincinnatiPartSubprogramWriter.cs

@@ -135,7 +135,7 @@ public sealed class CincinnatiPartSubprogramWriter
                 if (part.BaseDrawing.IsCutOff)
                     continue;
 
-                var pgm = PostedCopy(part.Program);
+                var pgm = PostedCopy(FeatureUtils.PostedProgram(part));
                 var bbox = pgm.BoundingBox();
                 pgm.Offset(-bbox.Location.X, -bbox.Location.Y);
 
@@ -222,7 +222,7 @@ public sealed class CincinnatiPartSubprogramWriter
             foreach (var part in plate.Parts)
             {
                 if (!part.BaseDrawing.IsCutOff)
-                    Register(part.Program);
+                    Register(FeatureUtils.PostedProgram(part));
             }
         }