Update to PrettyTables v3

[oscardssmith]

written by claude, passes test, works in repl.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.01%. Comparing base (66fb214) to head (b2c3724).
⚠️ Report is 34 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #43      +/-   ##
==========================================
+ Coverage   81.21%   84.01%   +2.79%     
==========================================
  Files           4        4              
  Lines         346      369      +23     
==========================================
+ Hits          281      310      +29     
+ Misses         65       59       -6     

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