Worlds

build_world(states, parameters, equations, controls=()) validates the schema before calling native World. State variables must use role state, controls role control, identifiers cannot collide with one another or parameter names, and each state must have exactly one equation target.

The resulting object is a native continuous executable world. Equation syntax and semantic validation occur in the compiled layer. Python does not build discrete worlds, hybrid models, stochastic worlds, delay equations, or causal graphs.