Replace 20×20 floor with 45×45 (~5× area). Add three occluder obstacles (ObstacleB/C/D) distributed across the expanded space for camera/occlusion stress QA. Add three terrace structures (TerracePlatformA, TerraceStepB+TerracePlatformB, TerracePlatformC) for vertical variation; each height transition respects agent_max_climb=0.35 m so the nav mesh routes onto all surfaces. Update README with district layout table and designer/QA limits. |
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