fix(openai): include prior assistant responses in later requests

[mtth]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 62.50000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.90%. Comparing base (014c428) to head (a8fe272).

Files with missing lines	Patch %	Lines
src/git_draft/progress.py	40.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #102      +/-   ##
==========================================
+ Coverage   84.85%   84.90%   +0.04%     
==========================================
  Files          15       16       +1     
  Lines        1070     1073       +3     
  Branches       86       86              
==========================================
+ Hits          908      911       +3     
  Misses        134      134              
  Partials       28       28              

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