`ForcePlate::autodetectNoiseThresholdAndClip` segfaults on sample AddBiomechanics data

Example data provided by Jade He:
[jade_test_original.zip](https://github.com/user-attachments/files/19329415/jade_test_original.zip)

Processing the above data crashes here:
https://github.com/keenon/nimblephysics/blob/1ac0ecfc8ca9f54fe56dcd7772a29499b1df3c28/dart/biomechanics/ForcePlate.cpp#L15