Fill the prompt with as much messages as possible

[RezaRahemtola]

But still proceed if all messages can't be fit

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.

Project coverage is 84.69%. Comparing base (f291839) to head (d0fa1a3).
Report is 11 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
libertai_agents/libertai_agents/models/base.py	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #21      +/-   ##
==========================================
- Coverage   84.83%   84.69%   -0.15%     
==========================================
  Files          12       12              
  Lines         277      281       +4     
==========================================
+ Hits          235      238       +3     
- Misses         42       43       +1     

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