fix(deps): pin source generator Roslyn common package

[j-d-ha]

🚀 Pull Request

📋 Summary

Pins the source generator's compiler-facing Roslyn references to 5.0.0 so the generator remains loadable by compiler hosts using Roslyn 5.0. The existing Microsoft.CodeAnalysis.CSharp exact pin is kept, and Microsoft.CodeAnalysis.Common is now pinned and referenced directly to make the dependency floor explicit.

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✅ Checklist

• My changes build cleanly
• I’ve added/updated relevant tests
• I’ve added/updated documentation or README
• I’ve tested the changes locally (if applicable)

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💬 Notes for Reviewers

Validation run:

• DOTNET_NOLOGO=1 dotnet restore src/MinimalLambda.SourceGenerators/MinimalLambda.SourceGenerators.csproj
• dotnet list src/MinimalLambda.SourceGenerators/MinimalLambda.SourceGenerators.csproj package --include-transitive confirmed Microsoft.CodeAnalysis.Common and Microsoft.CodeAnalysis.CSharp resolve to 5.0.0, while Microsoft.CodeAnalysis.Analyzers remains at 5.3.0.
• DOTNET_NOLOGO=1 dotnet build src/MinimalLambda.SourceGenerators/MinimalLambda.SourceGenerators.csproj --no-restore
• MCP test runner: tests/MinimalLambda.SourceGenerators.UnitTests/MinimalLambda.SourceGenerators.UnitTests.csproj passed 95 tests.

task format was intentionally not completed per follow-up instruction to focus on the package change.

[j-d-ha]

Closing this as redundant after checking the restore graph and compiled source generator assembly references.

Microsoft.CodeAnalysis.CSharp is already pinned to [5.0.0] on main, and that package transitively pins Microsoft.CodeAnalysis.Common to [5.0.0]. The built MinimalLambda.SourceGenerators.dll references Microsoft.CodeAnalysis 5.0.0.0 and Microsoft.CodeAnalysis.CSharp 5.0.0.0 already.

Microsoft.CodeAnalysis.Analyzers is a private development analyzer package used while building this repo; it is not referenced by the shipped source generator DLL and is not the consumer compiler-load issue.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@            Coverage Diff             @@
##             main     #354      +/-   ##
==========================================
- Coverage   87.52%   87.38%   -0.15%     
==========================================
  Files         113      113              
  Lines        2814     2814              
  Branches      351      351              
==========================================
- Hits         2463     2459       -4     
- Misses        250      254       +4     
  Partials      101      101              

see 1 file with indirect coverage changes

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