Compatibility for new and old grid files

[gauravharsha]

Add version checks for new grid files (pending the completion of green-grids PR 8):

1. Both old and new grid files are allowed.
2. Adds an attribute __grids_version__ to the output file
3. In restart mode, if the version in grid_file isn't compatible with version in the restarting data file, then sc initialization throws appropriate error.

[gauravharsha]

NOTE: tests will fail until the pull request for green-grids is merged.

[Copilot]

Pull request overview

Adds grid-file version tracking and restart-time compatibility checks to prevent mixing old/new green-grids formats, with accompanying test updates.

Changes:

• Persist __grids_version__ into SC results files and validate version compatibility on restart.
• Introduce a dedicated outdated_results_file_error exception type.
• Extend SC tests/CMake to supply grid parameters and add restart/version mismatch scenarios.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 5 comments.

File	Description
src/green/sc/sc_loop.h	Writes __grids_version__ to results and checks grids/results version compatibility during restart.
src/green/sc/except.h	Adds outdated_results_file_error exception.
test/sc_test.cpp	Updates tests to initialize grids/transformer usage and adds restart/version compatibility cases.
test/CMakeLists.txt	Adds TEST_PATH compile definition to locate test data files.

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[egull]

Thanks! Have a look at the github comments but merge once you feel it's ready. Overall looks good!

[codecov-commenter]

Codecov Report

❌ Patch coverage is 83.72093% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.65%. Comparing base (24e020f) to head (c6470a6).

Files with missing lines	Patch %	Lines
src/green/sc/common_defs.h	77.77%	4 Missing ⚠️
src/green/sc/sc_loop.h	87.50%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #7      +/-   ##
==========================================
- Coverage   96.45%   95.65%   -0.80%     
==========================================
  Files          10       10              
  Lines         648      690      +42     
==========================================
+ Hits          625      660      +35     
- Misses         23       30       +7     

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[Copilot]

Pull request overview

Copilot reviewed 5 out of 7 changed files in this pull request and generated 14 comments.

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[gauravharsha]

Copilot reviews addressed. Merging PR