docs(python): Document read_().lazy() antipattern

[ritchie46]

Hopefully the AI will understand.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.25%. Comparing base (a599b9e) to head (e4531dd).
Report is 26 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #21623      +/-   ##
==========================================
+ Coverage   80.22%   80.25%   +0.02%     
==========================================
  Files        1604     1604              
  Lines      231401   231439      +38     
  Branches     2639     2640       +1     
==========================================
+ Hits       185649   185732      +83     
+ Misses      45143    45098      -45     
  Partials      609      609              

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