!todo fix `bordure rayonne` corners

!todo fix `bordure rayonne` corners
!draw Argent, a bordure rayonne Gules
The top corners are messed up — there's a horizontal rayonne line, which is then overlapping the vertical rayonne lines, with the base of the rayonne pattern on the very edge of the field. I imagine it would work better if there was one long rayonne line running around the inner edge of the bordure, pointing outwards, and bending around the corners.

Locate the implementation that renders a `bordure rayonne` from the `!draw Argent, a bordure rayonne Gules` example, then reproduce the top-corner output. Inspect how the horizontal and vertical rayonne lines meet at the field edge; done means the corners form one continuous inner-edge pattern without overlapping lines.

Written by the indexing model from the issue text.