Main's quiltWarp support (#6913) rewrote the same placed-warp code the
cylinder warp touches. Kept main's split-warp read and write
(warp_head, quiltWarp, sold_warp) and added the cylinder to it:
warp_head writes `warpValues` for a cylinder, placed_frame frames a
cylinder's mesh as well as any valid custom mesh, quad_points uses
perspective_frame of the warp the block stores, and parse_smart_perspective
reads `quiltWarp` before `warp`, as parse_placed_warp does, so a projective
placement is framed by the warp that is imported.
Co-authored-by: alvarohn <32224796+alvarohn@users.noreply.github.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
