Keep negative inter departure samples

[mengelbart]

The estimator and detector can actually handle this fine, and it fixes an issue I discovered in simulation testing.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.08%. Comparing base (3d39820) to head (c262bd0).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #60      +/-   ##
==========================================
- Coverage   99.09%   99.08%   -0.01%     
==========================================
  Files           9        9              
  Lines         441      438       -3     
==========================================
- Hits          437      434       -3     
  Misses          2        2              
  Partials        2        2              

Flag	Coverage Δ
go	99.08% <ø> (-0.01%)	⬇️

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