Updates solver to include the fix for PlanarConstraint axial drift
when combined with CylindricalConstraint. The distance residual now
uses a world-frame reference normal (Const nodes) instead of the
body-attached normal that rotates with the body.
Updates mods/solver to include fix for the planar half-space correction
that caused 'flipped orientation' rejections when dragging a body
connected by a Cylindrical joint + distance=0 Planar constraint.
The solver's PlanarConstraint half-space tracker was reflecting the body
through the plane when the face normal dot product crossed zero during
legitimate rotation about the cylindrical axis. Now returns a tracking-
only HalfSpace (no correction) for on-plane constraints, matching the
pattern used by Cylindrical/Revolute/Concentric trackers.
See: kindred/solver#38
