Setpoint helpers for simple control loops.
```toml
[dependencies]
use-setpoint = "0.0.1"
```
Use `use-setpoint` when you need explicit target, tolerance, and error helpers
for small control loops and testable setpoint logic.
This crate is part of the `use-control` workspace. Depend on `use-control` when
you want the full facade.
This crate is experimental and may evolve while the workspace remains below
`0.3.0`.