Jonas Reith
817c701bd1
Promote debug/HexDiamondIsland.gd to terrain.gd at project root now that main.tscn depends on it, and swap it in for the old flat checkerboard Ground (Player/Camera/POI untouched, table sits at the same y=0 the old ground surface used). Add _build_region_borders(): places mountain.glb/mountain2v5.glb/ forest.glb (same models, scale factors and hitbox sizes already used elsewhere in main.tscn) continuously along the 6 ridges between table corners and girdle corners, i.e. the shared edges between adjacent outer regions.