🏔️ Tabletop World Sculptor: Terrain Brushes, Hydraulic Erosion, Lava Flow and Villager Agents Lab

Sculpt a miniature world on a wooden table with seven terrain brushes, then press Run: rain fills rivers and erodes the land, steep piles slump, a volcano pours Bingham lava that cools to basalt, and twenty villagers walk Tobler-speed paths, eat, sleep and run to high ground. Real shallow-water, erosion and lava equations with mass ledgers, six challenges, save and load, CSV and JSON export.