fix: correct .NET target framework description in system.md

[Copilot]

Summary

Performed formal reviews for all 5 review-sets defined in .reviewmark.yaml. One medium-severity issue was identified and fixed.

Review-sets Processed

Review-set ID	Title	Result
NuGetCaching-System	Review of NuGetCaching System Integration	⚠️ Issue found and fixed
NuGetCaching-Design	Review of NuGetCaching Architecture and Design	✅ No issues
NuGetCaching-AllRequirements	Review of All NuGetCaching Requirements	✅ No issues
NuGetCaching-NuGetCache	Review of NuGetCaching NuGetCache Unit	✅ No issues
NuGetCaching-PathHelpers	Review of NuGetCaching PathHelpers Unit	✅ No issues

Issue Fixed

File: docs/design/system.md (Design Constraints section)

Problem: The document stated the library targets ".NET Standard 2.0 for maximum compatibility, with additional security validation enabled on .NET 5.0 and later." This was inaccurate — the project actually targets netstandard2.0;net8.0;net9.0;net10.0, not .NET 5.0 specifically.

Fix: Updated the description to accurately list all target frameworks (netstandard2.0, net8.0, net9.0, net10.0) and clarify that the additional security validation applies to builds targeting .NET 5.0 or later frameworks (which covers the net8.0+ targets).

[Copilot]

Pull request overview

Updates the NuGet Caching system design documentation to accurately reflect the library’s multi-targeted .NET frameworks and when additional security validation is enabled.

Changes:

• Corrected the “Design Constraints” description to list the actual target frameworks (.NET Standard 2.0 plus .NET 8/9/10).
• Clarified that the additional security validation is enabled for builds targeting .NET 5.0-or-later frameworks (covering the net8.0+ targets).

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