Fix NETStandard.Library license detection

[Copilot]

The NETStandard.Library package was incorrectly showing "License: Unknown" instead of the correct "MIT" license, causing false positive policy violations.

Problem

When PackageGuard analyzed projects using NETStandard.Library 2.0.3, it would report:

Policy violations found:

NETStandard.Library 2.0.3
- License: Unknown
- Feed: nuget.org (https://api.nuget.org/v3/index.json)

This occurred because the NETStandard.Library package metadata doesn't include proper license information, causing all license fetching strategies to fail and default to "Unknown".

Solution

Added specific handling for NETStandard.Library in the CorrectLicenseUrlsForMisbehavingPackagesFetcher class, following the same pattern as existing NUnit package handling:

if (package.Name.Equals("NETStandard.Library", StringComparison.InvariantCultureIgnoreCase))
{
    package.License = "MIT";
    package.RepositoryUrl = "https://github.com/dotnet/standard";
}

Result

Projects using NETStandard.Library will now correctly show:

NETStandard.Library 2.0.3
- License: MIT
- Feed: nuget.org (https://api.nuget.org/v3/index.json)

This eliminates false positive policy violations for projects legitimately using the .NET Standard Library.

Testing

Added comprehensive test case NETStandard_Library_should_have_MIT_license() to verify the fix works correctly and prevent regressions.

Fixes #56.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/microsoft/codecoverage/license
  • Triggering command: /usr/lib/dotnet/dotnet exec --runtimeconfig /home/REDACTED/work/packageguard/packageguard/Src/PackageGuard.Specs/bin/Release/net8.0/PackageGuard.Specs.runtimeconfig.json --depsfile /home/REDACTED/work/packageguard/packageguard/Src/PackageGuard.Specs/bin/Release/net8.0/PackageGuard.Specs.deps.json /home/REDACTED/work/packageguard/packageguard/Src/PackageGuard.Specs/bin/Release/net8.0/testhost.dll --port 38789 --endpoint 127.0.0.1:038789 --role client --parentprocessid 4011 --telemetryoptedin false (http block)
• https://api.github.com/repos/nunit/nunit/license
  • Triggering command: /usr/lib/dotnet/dotnet exec --runtimeconfig /home/REDACTED/work/packageguard/packageguard/Src/PackageGuard.Specs/bin/Release/net8.0/PackageGuard.Specs.runtimeconfig.json --depsfile /home/REDACTED/work/packageguard/packageguard/Src/PackageGuard.Specs/bin/Release/net8.0/PackageGuard.Specs.deps.json /home/REDACTED/work/packageguard/packageguard/Src/PackageGuard.Specs/bin/Release/net8.0/testhost.dll --port 38789 --endpoint 127.0.0.1:038789 --role client --parentprocessid 4011 --telemetryoptedin false (http block)
• https://api.github.com/repos/xunit/xunit/license
  • Triggering command: /usr/lib/dotnet/dotnet exec --runtimeconfig /home/REDACTED/work/packageguard/packageguard/Src/PackageGuard.Specs/bin/Release/net8.0/PackageGuard.Specs.runtimeconfig.json --depsfile /home/REDACTED/work/packageguard/packageguard/Src/PackageGuard.Specs/bin/Release/net8.0/PackageGuard.Specs.deps.json /home/REDACTED/work/packageguard/packageguard/Src/PackageGuard.Specs/bin/Release/net8.0/testhost.dll --port 38789 --endpoint 127.0.0.1:038789 --role client --parentprocessid 4011 --telemetryoptedin false (http block)
  • Triggering command: /usr/lib/dotnet/dotnet exec --runtimeconfig /home/REDACTED/work/packageguard/packageguard/Src/PackageGuard.Specs/bin/Release/net8.0/PackageGuard.Specs.runtimeconfig.json --depsfile /home/REDACTED/work/packageguard/packageguard/Src/PackageGuard.Specs/bin/Release/net8.0/PackageGuard.Specs.deps.json /home/REDACTED/work/packageguard/packageguard/Src/PackageGuard.Specs/bin/Release/net8.0/testhost.dll --port 33767 --endpoint 127.0.0.1:033767 --role client --parentprocessid 5327 --telemetryoptedin false (http block)
• www.nuget.org
  • Triggering command: /usr/lib/dotnet/dotnet exec --runtimeconfig /home/REDACTED/work/packageguard/packageguard/Src/PackageGuard.Specs/bin/Release/net8.0/PackageGuard.Specs.runtimeconfig.json --depsfile /home/REDACTED/work/packageguard/packageguard/Src/PackageGuard.Specs/bin/Release/net8.0/PackageGuard.Specs.deps.json /home/REDACTED/work/packageguard/packageguard/Src/PackageGuard.Specs/bin/Release/net8.0/testhost.dll --port 38789 --endpoint 127.0.0.1:038789 --role client --parentprocessid 4011 --telemetryoptedin false (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

---

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[github-actions]

Test Results

46 tests  +1   46 ✅ +1   50s ⏱️ +13s
 2 suites ±0    0 💤 ±0 
 2 files   ±0    0 ❌ ±0 

Results for commit 7203215. ± Comparison against base commit 86673f1.

[coveralls]

Pull Request Test Coverage Report for Build 16537072718

Details

• 6 of 6 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 76.148%

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Totals
Change from base Build 16529841367:	0.2%
Covered Lines:	504
Relevant Lines:	673

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💛 - Coveralls