don't re-export StaticSim from sim/mod.rs

this way we can clearly spot the legacy users.

crates/coremem/src/render.rs

@@ -1,7 +1,8 @@
 use crate::geom::Meters;
 use crate::real::ToFloat as _;
 use crate::types::vec::{Vec2, Vec3};
-use crate::sim::{SampleableSim, Sample, StaticSim};
+use crate::sim::{SampleableSim, Sample};
+use crate::sim::legacy::StaticSim;
 use crate::meas::{self, AbstractMeasurement};
 use crossterm::{cursor, QueueableCommand as _};
 use crossterm::style::{style, Color, PrintStyledContent, Stylize as _};