fix: remove dangerous G0 X0 Y0 return-to-home rapids from Cincinnati post

Rapid traversing back to origin over a sheet of freshly cut parts risks
collisions with tipped or warped pieces. Removed from both the sheet
footer and part subprogram endings.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

OpenNest.Posts.Cincinnati/CincinnatiPartSubprogramWriter.cs

@@ -66,7 +66,6 @@ public sealed class CincinnatiPartSubprogramWriter
             _featureWriter.Write(w, ctx);
         }
 
-        w.WriteLine("G0 X0 Y0");
         w.WriteLine($"M99 (END OF {drawingName})");
     }