🔧 Forge: NuGet Dependency and Framework Modernization

[tedd]

• 💡 Target: Core Tedd.SpanUtils package dependencies, test project packages, tool target frameworks (Benchmark/SourceGenerator).
• 🎯 Execution: System.Memory updated to 4.6.0 and System.Runtime.CompilerServices.Unsafe to 6.1.0 in Tedd.SpanUtils.csproj. Outdated frameworks (net5.0) in tool projects migrated to net8.0. xUnit, BenchmarkDotNet, and Roslyn CodeAnalysis dependencies upgraded to stable versions verified via the NuGet flatcontainer API.
• 📊 Compatibility Impact: Multi-targeting (net462, netstandard2.0, netstandard2.1, net8.0, net10.0) remains intact. Older consumer compatibility preserved.
• 🔬 Verification Protocol: dotnet build, dotnet test, dotnet pack, and dotnet format executed across src/Tedd.SpanUtils.sln. Tests pass successfully.
• 📦 NuGet Package Validation: Explored Tedd.SpanUtils.1.1.0-beta.7.nupkg via unzip -p. Dependency groups verified as strictly partitioned per target framework without leakage.
• ⚠️ Breaking-Change Assessment: SemVer Patch/Minor. Modernization only bumps dependency constraints; no public API surface changes were made.

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PR created automatically by Jules for task 5371295483690275410 started by @tedd

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[Copilot]

Pull request overview

This PR modernizes NuGet dependencies and target frameworks across the Tedd.SpanUtils solution, keeping the core library’s multi-targeting intact while bringing supporting projects (tests/benchmarks/tools) onto maintained package and framework versions.

Changes:

• Updated System.Memory and System.Runtime.CompilerServices.Unsafe package versions in the core Tedd.SpanUtils library for legacy targets.
• Upgraded test dependencies (Microsoft.NET.Test.Sdk, xUnit, runners, coverlet, and Tedd.RandomUtils) and removed the deprecated Microsoft.NETCore.App reference.
• Migrated internal tool projects (Benchmark, SourceGenerator) from net5.0 to net8.0 and added a Forge note documenting the drift/remediation.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/Tedd.SpanUtils/Tedd.SpanUtils.csproj	Bumps legacy-target package references for System.Memory and Unsafe while preserving existing multi-targeting.
src/Tedd.SpanUtils.Tests/Tedd.SpanUtils.Tests.csproj	Modernizes test SDK/runner/coverage dependencies and removes deprecated runtime package reference.
src/Tedd.SpanUtils.SourceGenerator/Tedd.SpanUtils.SourceGenerator.csproj	Moves source generator tooling to net8.0 and updates Roslyn/analyzer packages.
src/Tedd.SpanUtils.DotNet4Tests/Tedd.SpanUtils.DotNet4Tests.csproj	Aligns .NET Framework test project dependencies with updated System.Memory, xUnit, and Tedd.RandomUtils.
src/Tedd.SpanUtils.Benchmark/Tedd.SpanUtils.Benchmark.csproj	Migrates benchmarks to net8.0 and updates BenchmarkDotNet packages.
.jules/forge.md	Adds a Forge log entry describing the identified dependency/framework drift and the intended remediation steps.

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