feat: improve consistency across compute policies

[imrn99]

Summary

• formalize the behavior of the rectangle compute methods
• split ComputeMethod::Rectangle into ComputeMethod::RectangleLeft and ComputeMethod::RectangleRight

Content

• Scope:
  • [x] Code
  • [x] Documentation
  • [x] Fix: closes #10
• Type of change:
  • [x] New feature(s)

[codecov-commenter]

Codecov Report

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

Project coverage is 93.52%. Comparing base (7451f03) to head (4b4bcaa).

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## trunk #11 +/- ## ========================================== + Coverage 92.88% 93.52% +0.63% ========================================== Files 3 3 Lines 225 247 +22 ========================================== + Hits 209 231 +22 Misses 16 16 ```

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