ludic/changes/mesh-grass.md

bump: minor type: feat Mesh-shader grass — on a card with VK_EXT_mesh_shader, r3d_mesh_grass(on) draws each chunk of grass tiles as one mesh-shader dispatch, and a blade that is culled emits no vertices at all.

• ludic-dev shaders — a variant whose first file is *.mesh compiles that stage as a Vulkan 1.3 mesh shader; its SPIR-V keeps the .vert name, so the manifest is unchanged.
• The seam — gpu_has_mesh() and gpu_draw_mesh_tasks(x, y, z); a mesh program's pipeline has no vertex input and its bindings the mesh stage. The device enables meshShader and maintenance4.