[brettfo]

What are you trying to accomplish?

Fix false package incompatibility reports for versioned platform TFMs.

Anything you want to highlight for special attention from reviewers?

Fall back to NuGet's compatibility provider while preserving existing compatibility exceptions.

How will you know you've accomplished your goal?

Package-backed regression tests reproduced three failures before the fix. All 177 targeted tests now pass:

dotnet test nuget\helpers\lib\NuGetUpdater\NuGetUpdater.Core.Test\NuGetUpdater.Core.Test.csproj --no-restore --filter 'FullyQualifiedName~Analyze|FullyQualifiedName~FrameworkChecker' --verbosity quiet --nologo -clp:ErrorsOnly

Full suite not run.

Checklist

• I have run the complete test suite to ensure all tests and linters pass.
• I have thoroughly tested my code changes to ensure they work as expected, including adding additional tests for new functionality.
• I have written clear and descriptive commit messages.
• I have provided a detailed description of the changes in the pull request, including the problem it addresses, how it fixes the problem, and any relevant details about the implementation.
• I have ensured that the code is well-documented and easy to understand.

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