Add Ground Zero natural environment pass

Docs/Terrain/GroundZeroNaturalEnvironmentPass.md

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+# Ground Zero MVP Natural Environment Pass
+
+The Ground Zero map now has a first MVP natural environment pass so the investor
+demo reads as coastal California scrub/woodland instead of a plain grey-box test
+space.
+
+## Scope
+
+- Terrain receives a warm coastal scrub ground material.
+- Foliage patch instances keep the current prototype meshes but use distinct
+  tree, shrub, and dry grass materials.
+- Wood, fiber, stone, and freshwater actors receive distinct first-pass
+  materials.
+- The setup remains repeatable through `Scripts/setup_ground_zero_demo_map.py`.
+
+## Material Assets
+
+- `/Game/Agrarian/Materials/M_AGR_GZ_Terrain_CoastalScrub`
+- `/Game/Agrarian/Materials/M_AGR_GZ_Tree_CoastalOak`
+- `/Game/Agrarian/Materials/M_AGR_GZ_Shrub_CoyoteBrush`
+- `/Game/Agrarian/Materials/M_AGR_GZ_Grass_DryCoastal`
+- `/Game/Agrarian/Materials/M_AGR_GZ_Wood_Resource`
+- `/Game/Agrarian/Materials/M_AGR_GZ_Fiber_Resource`
+- `/Game/Agrarian/Materials/M_AGR_GZ_Stone_Sandstone`
+- `/Game/Agrarian/Materials/M_AGR_GZ_FreshWater`
+
+## Validation
+
+`Scripts/verify_ground_zero_natural_environment_pass.py` checks that the
+materials exist, the landscape uses the terrain material, the foliage actor has
+the expected instance counts and material assignments, and resource/water actors
+are visually dressed.
+
+## Follow-Up
+
+This pass deliberately keeps the current prototype geometry so it stays small
+and stable. The next environment work should add first-pass asset variation so
+trees, bushes, grass, resource nodes, and water no longer read as repeated
+placeholder shapes.