ci: update tests

[tlambert03]

trying to cleanup the testing patterns on CI. no more makefile, just uv. no more retries (let's see what's still failing)

this includes #233 ... since I'm confident I want that going forward, and all my branches will likely include that now

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.60%. Comparing base (c1de031) to head (135ebbd).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #237   +/-   ##
=======================================
  Coverage   86.60%   86.60%           
=======================================
  Files          46       46           
  Lines        5196     5196           
=======================================
  Hits         4500     4500           
  Misses        696      696           

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