WIP: revised build and CI

[cole]

Goals: simplify CI and remove poetry in favour of build

[codecov[bot]]

Codecov Report

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

Project coverage is 93.66%. Comparing base (6162aa6) to head (28c23c6).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #234      +/-   ##
==========================================
- Coverage   94.51%   93.66%   -0.85%     
==========================================
  Files          12       12              
  Lines         948      821     -127     
  Branches      199      172      -27     
==========================================
- Hits          896      769     -127     
  Misses         31       31              
  Partials       21       21              

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