B008 Do not perform function call `np.arange` in argument defaults; instead, perform the call within the function, or read the default from a module-level singleton variable

```
t: np.ndarray = np.arange(0, 20, 0.1), # TODO: B008 Do not perform function call `np.arange` in argument defaults; instead, perform the call within the function, or read the default from a module-level singleton variable
```

In file ssms/basic_simulators/drift_functions.py
https://github.com/lnccbrown/ssm-simulators/blob/b04d824839dc63bf0d50af48805bd8a95de960e7/ssms/basic_simulators/drift_functions.py#L192

Start by reading ssms/basic_simulators/drift_functions.py around line 192 and inspect the function using the np.arange default. Confirm the default no longer performs that call during function definition, while preserving the documented time-array behavior; the linked file location is the main entry point provided.

Written by the indexing model from the issue text.