Kernel rig: the plate with a hole through its arc side shells open at its far end

SMLib's merge now intersects the offsets of an edge's faces where they could not be mated along
it (the hole's offset poking out through the half-round side's; tangency-labs/solidcore#1795):
one closed valid solid with the one face open, as the owner ruled.

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

tests/kernel-cases/shell/KNOWN_FAILING

@@ -7,5 +7,4 @@
 545-shell-ring-cut-frame-open-at-an-outer-wall SMLib status 1001
 616-shell-open-a-rib-side-face-of-a-lid SMLib status 1001
 cov-shell-again-open-at-an-inner-wall-of-a-shelled-box SMLib status 1001
-cov-shell-plate-with-a-hole-through-its-arc-side SMLib status 1001 where the hole's wall meets the arc side
 cov-shell-up-down-joined-squares-open-at-a-side-wall SMLib status 1001