L_World: a 200 km2 world-partitioned landscape from a seeded heightmap

Off the ladder at the user's request. Scripts/Authoring/generate_heightmap.py (numpy, installed locally by
bootstrap-pylib.sh) writes a 16-bit height PNG and three 8-bit weight PNGs to Content/World/Heightmaps;
create_world.py rebuilds /Game/Maps/L_World from them through ULandscapeAuthoringLibrary in the new SaltyEditor
module, which wraps ALandscape::Import because the engine exposes no landscape creation to Python. Uses
Elite_RockyMeadows' landscape material and layer infos (the pack itself is still uncommitted). 4033 vertices
a side at 350 cm a quad; swap the PNGs and rerun to change the terrain.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

Source/SaltyEditor/SaltyEditor.Build.cs

@@ -0,0 +1,25 @@
+using UnrealBuildTool;
+
+// Editor-only tools. Arrived with the first one (Docs/Spec/Architecture.md, Modules): the landscape authoring
+// library that Scripts/Authoring/create_world.py calls, because the engine exposes no landscape creation to Python.
+public class SaltyEditor : ModuleRules
+{
+	public SaltyEditor(ReadOnlyTargetRules Target) : base(Target)
+	{
+		PCHUsage = PCHUsageMode.UseExplicitOrSharedPCHs;
+
+		PublicDependencyModuleNames.AddRange(new string[] {
+			"Core",
+			"CoreUObject",
+			"Engine"
+		});
+
+		PrivateDependencyModuleNames.AddRange(new string[] {
+			"UnrealEd",
+			"Landscape",
+			"LandscapeEditor"   // FLandscapeImportHelper reads the heightmap and weightmap files
+		});
+
+		PublicIncludePaths.Add(ModuleDirectory);
+	}
+}