pin mesa below 4

[wang-boyu]

Note

Use this template for bug fixes only. For enhancements/new features, use the feature template and get maintainer approval in an issue/discussion before opening a PR.

Pre-PR Checklist

• This PR is a bug fix, not a new feature or enhancement.

Summary

Fixes #164.

Bug / Issue

Mesa-LLM is not yet compatible with Mesa 4. The codebase still contains Mesa 4-breaking usage such as mesa.space, model.steps, and other API assumptions that are still being worked through in separate issues and PRs.

Without this fix, users can install Mesa 4 and hit import/runtime failures even though Mesa 4 support is not complete yet.

Implementation

Pin Mesa to <4 for now by changing the dependency from:

• mesa[rec]>=3.0

to:

• mesa[rec]>=3.0,<4

Additional Notes

This PR does not add Mesa 4 support. It only prevents installation of an unsupported major version while the migration is coordinated separately.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.20%. Comparing base (68ffd9d) to head (5061670).
⚠️ Report is 24 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #272   +/-   ##
=======================================
  Coverage   91.20%   91.20%           
=======================================
  Files          19       19           
  Lines        1592     1592           
=======================================
  Hits         1452     1452           
  Misses        140      140           

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