TV Terrain Elevation

Workflow

• Run:
• rg -n "applyBiomeElevation|applyCliffRamps|applyCliffs" src/spawn.nim
• sed -n '120,260p' src/spawn.nim
• rg -n "canTraverseElevation" src/environment.nim
• sed -n '400,460p' src/environment.nim
• rg -n "RampUp|RampDown|Cliff" src/terrain.nim src/types.nim src/registry.nim
• Explain how elevation traversal is handled.