[alexjuv]

Summary

Related issue

Validation

Checklist

• I searched existing issues and pull requests to avoid duplicates.
• I kept this pull request focused and avoided unrelated refactors.
• I added or updated tests, evals, or documentation when changing skill or agent behavior.
• I updated CODEOWNERS when adding or moving owned content.
• I updated all marketplace manifests when plugin metadata changed.
• I updated eng/known-domains.txt for any new external domains referenced by skill content.

Evaluation changes only

For every eval-related change, including a new eval:

• Scenarios are necessary, distinct, and use natural prompts.
• Graders cover the full result, accept the golden result, and reject a realistic mutation.
• No-op, dormancy, and statistical power are covered where needed.
• I ran the applicable production evaluation path and recorded the result above.
• If this fixes a failed eval, I classified the failure before editing skill content.
• If this broadly changes routing or behavior, I checked separate model-family evidence.

[Copilot]

🟢 Approval recommended

The focused documentation changes are internally consistent and have no identified blocking issues.

No open issues 🎉

What changed in this PR

This PR clarifies Visual Studio requirements in the .NET 9-to-.NET 10 migration skill, distinguishing supported IDE builds from command-line builds.

Changes:

• Adds Visual Studio 2026 (18.0+) compatibility checks to project assessment and build guidance.
• Documents SDK loading versus supported framework targeting, command-line alternatives, and SLNX compatibility.
• Clarifies that C# diagnostic version annotations do not define the IDE requirements for .NET 10.

File	Description
plugins/​dotnet-upgrade/​skills/​migrate-dotnet9-to-dotnet10/​SKILL.md	Adds IDE compatibility checks for developer and CI environments.
plugins/​dotnet-upgrade/​skills/​migrate-dotnet9-to-dotnet10/​references/​sdk-msbuild-dotnet9to10.md	Explains Visual Studio support requirements and command-line alternatives.
plugins/​dotnet-upgrade/​skills/​migrate-dotnet9-to-dotnet10/​references/​csharp-compiler-dotnet9to10.md	Distinguishes diagnostic versions from .NET 10 IDE requirements.

_{Review effort: Balanced}

[alexjuv]

checked " Scenarios are necessary, distinct, and use natural prompts."

[Copilot]

🟢 Approval recommended

The focused guidance changes consistently distinguish SDK and IDE support, with no unresolved review findings.

No open issues 🎉

_{Review effort: Balanced}

[alexjuv]