fix: add cgs to unit system instances

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.28%. Comparing base (4e2e9bd) to head (60c4c66). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #267 +/- ## ======================================= Coverage 96.28% 96.28% ======================================= Files 42 42 Lines 1479 1479 ======================================= Hits 1424 1424 Misses 55 55 ```

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