Scenarios and trajectory data

Scenario(initial, parameters={}, inputs={}, interventions=()) is an immutable simulation request. Mapping keys must be identifiers. Intervention(time, target, value, kind) permits finite values and kind of parameter or input; interventions are sorted by their dataclass order when a scenario is created.

simulate(world, scenario, start=0.0, end=1.0, step=0.01) creates the native request and returns TrajectoryData. It represents scheduled constant overrides, not event triggers, state resets, intervention optimization, or causal analysis.