Candidates now carry their own stacking strategy, inheriting the route's
when absent, so the default tilt applies consistently. Drop the now
redundant explicit tilt from the poker deck.
Apply the same tilt to every stacked part and rotate it about its local
Y axis instead of Z. Default tilt to 1 degree when a stacking strategy
is present, and arc the poker deck along the surface's bottom edge.
Replace the per-part lift with a local Y-axis tilt that fans the stack,
and add zStart/zEnd to ramp the stack's height across the curve so it
arches in 3D. Update the poker deck and docs accordingly.
hypercross