update readme for latest updates for green-grids version checks.

[gauravharsha]

No description provided.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.65%. Comparing base (c6470a6) to head (dcbd62f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

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  Coverage   95.65%   95.65%           
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  Files          10       10           
  Lines         690      690           
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  Hits          660      660           
  Misses         30       30           

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[Copilot]

Pull request overview

This pull request updates the README documentation to include information about the new get_grids_version() method that must be implemented by user-defined Dyson solver classes. This method is used by the self-consistency loop to track and validate the version of green-grids transformation grid files, preventing silent errors when restarting from results files created with different grid versions.

Changes:

• Added documentation for the new required get_grids_version() method in the Dyson solver interface
• Added an example implementation in the code example showing how to implement this method both with and without green-grids dependency

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