chore: adopt Central Package Management for solution dependencies

[Copilot]

This change introduces Central Package Management (CPM) at the solution root so NuGet versions are defined once instead of being duplicated across project files. Package version pins are now centralized for test and benchmark dependencies.

• What changed

  • Added Directory.Packages.props with:
    • ManagePackageVersionsCentrally=true
    • Centralized versions for all solution package dependencies (8 total)
  • Updated tests/FixedPointNano.Tests/FixedPointNano.Tests.csproj:
    • Removed inline Version attributes from all PackageReference entries
    • Kept existing IncludeAssets / PrivateAssets settings unchanged
  • Updated benchmarks/FixedPointNano.Benchmarks/FixedPointNano.Benchmarks.csproj:
    • Removed inline Version from BenchmarkDotNet reference

• Central version manifest

  <Project>
    <PropertyGroup>
      <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
    </PropertyGroup>
    <ItemGroup>
      <PackageVersion Include="BenchmarkDotNet" Version="0.14.0" />
      <PackageVersion Include="coverlet.collector" Version="6.0.4" />
      <PackageVersion Include="coverlet.msbuild" Version="8.0.1" />
      <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.14.0" />
      <PackageVersion Include="Moq" Version="4.20.72" />
      <PackageVersion Include="NUnit" Version="4.3.2" />
      <PackageVersion Include="NUnit.Analyzers" Version="4.7.0" />
      <PackageVersion Include="NUnit3TestAdapter" Version="5.0.0" />
    </ItemGroup>
  </Project>

[Copilot]

Pull request overview

Adopts NuGet Central Package Management (CPM) so package versions are defined once at the repository root instead of being duplicated across individual project files, centralizing test and benchmark dependency version pins.

Changes:

• Added Directory.Packages.props enabling ManagePackageVersionsCentrally and defining 8 centralized PackageVersion entries.
• Removed inline Version="..." attributes from PackageReference items in the test project.
• Removed the inline Version="..." attribute from the BenchmarkDotNet reference in the benchmarks project.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
Directory.Packages.props	Introduces CPM and centrally pins all solution NuGet package versions.
tests/FixedPointNano.Tests/FixedPointNano.Tests.csproj	Switches test package references to rely on centrally managed versions.
benchmarks/FixedPointNano.Benchmarks/FixedPointNano.Benchmarks.csproj	Switches BenchmarkDotNet reference to rely on centrally managed version.

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