Vertex shader for the modern terrain dispatcher. Bit-identical math
to today's terrain.vert (Phase 3c per-cell mesh + Phase G AdjustPlanes
lighting). The only structural change is the version + bindless
extension preamble — sampler access stays a regular sampler2DArray
uniform; bindless-ness is invisible at the GLSL level.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
