Prep 5.1 release

[natemcmaster]

No description provided.

[claude]

Code Review

Thanks for putting this release together! I've reviewed the full diff and no substantive issues found. Here's a summary of what's covered:

• Version bump 5.0.1 → 5.1.0 with changelog and release notes for the keyed DI feature (Add support for keyed DI and update target frameworks #560)
• Dependency updates — Microsoft.Extensions.* 10.0.3→10.0.5, coverlet 6.0.4→8.0.1, FluentAssertions 8.8→8.9, Microsoft.NET.Test.Sdk 18.0.1→18.3.0, SourceLink 10.0.103→10.0.201
• Tooling cleanup — removed dotnet-format tool entry in favor of built-in dotnet format; enabled IDE0005 (unnecessary usings) as a warning; added GenerateDocumentationFile in test props to support the analyzer
• Preprocessor directive cleanup — removed NET472_OR_GREATER branches from #if guards around [RequiresUnreferencedCode] and [DynamicallyAccessedMembers] attributes (safe since the project targets .NET 6.0+ only, and PolySharp is configured with PolySharpIncludeRuntimeSupportedAttributes)
• DictionaryExtensions.cs restructure — correctly scopes the TryAdd polyfill to NET472_OR_GREATER only, with #error for unexpected targets
• Samples — new keyed DI sample, license headers added, wildcard *.csproj reference fixed to explicit filename, unnecessary usings removed
• Directory.Build.targets — good fix changing *.csproj glob to explicit McMaster.Extensions.CommandLineUtils.csproj to avoid matching unintended projects

Everything looks correct and consistent. Ship it! 🚢

---

Automated review by Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.00%. Comparing base (758fcca) to head (13814e4).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #606      +/-   ##
==========================================
- Coverage   80.32%   80.00%   -0.33%     
==========================================
  Files         121      120       -1     
  Lines        4031     4061      +30     
  Branches      875      879       +4     
==========================================
+ Hits         3238     3249      +11     
- Misses        616      623       +7     
- Partials      177      189      +12     

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