ASSET_G-022: Advanced Environment Tiles

## Requirements
- Water Animation: River edge (4 frames), lake, waterfall (4)
- Vegetation: Trees (small/medium/large), bushes, grass, flowers
- Paths: Dirt, stone, cobble, wood planks
- Cliffs: Straight, corner, ramp, stairs (1-3 height levels)

## Specs
- Water: 4 FPS animation
- Vegetation: 48x96 to 64x128
- Tiles: 64x32 isometric