refactor grid version checks

[gauravharsha]

Generalize version check utilities so they can be used in other green packages.

[Copilot]

Pull request overview

Refactors GRIDS version checking by replacing the previous boolean helper with a generalized version-string comparator and adds an HDF5 results-file version consistency check intended for reuse across other green packages.

Changes:

• Replace CheckVersion() with compare_version_strings() and update existing version assertions to use numeric comparison results.
• Add check_grids_version_in_hdf5() to validate __grids_version__ consistency between a results HDF5 file and the current run’s grids version.
• Introduce outdated_results_file_error and extend tests to cover the new HDF5 version-consistency behavior.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
test/grids_test.cpp	Updates version checks to use compare_version_strings() and adds a new HDF5 version-consistency test section.
c++/transformer.cpp	Switches transformer grid-file minimum-version enforcement to compare_version_strings().
c++/green/grids/except.h	Adds a new exception type for “results file too old” cases.
c++/green/grids/common_defs.h	Adds compare_version_strings() and declares check_grids_version_in_hdf5(); adds an HDF5 include.
c++/common_defs.cpp	Implements check_grids_version_in_hdf5() using HDF5 attributes and version comparison.

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 97.67442% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 97.16%. Comparing base (a5846c4) to head (a3f6025).

Files with missing lines	Patch %	Lines
c++/green/grids/common_defs.h	94.44%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #10      +/-   ##
==========================================
- Coverage   99.40%   97.16%   -2.25%     
==========================================
  Files           8       27      +19     
  Lines         337     1658    +1321     
  Branches        0       60      +60     
==========================================
+ Hits          335     1611    +1276     
- Misses          2       28      +26     
- Partials        0       19      +19     

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[egull]

Consider the codecov comments (add tests for the outdated cases) and the copilot comments (awfully particular today). Then merge once happy.

[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

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