v1.0.1

bump viewport-lib version

v1.0.0

Initial release.

• TerrainPlugin registers as a viewport-lib ItemTypePlugin and draws inside the standard scene pass.
• u16 heightmaps with world-space placement, footprint, and height range.
• Eight surface layers (albedo, metallic, roughness, height bias) blended through two RGBA splatmap textures with height-aware weighting.
• Quadtree-style patch LOD with skirts to hide cracks between neighbouring patches.
• Per-patch frustum culling.
• CPU ray-picking against the source heightmap.
• Detail scatter for grass billboards and tree meshes, with tree impostor LOD.