Fix .NET package version props generation

[stephentoub]

The .NET package should include GitHub.Copilot.SDK.props so consumers get CopilotCliVersion from the NuGet build assets. After the multi-targeting change, _GenerateVersionProps ran before Pack, which is too late for NuGet's _GetPackageFiles collection, causing the props file to be omitted.

This changes the generation hook to run before _GetPackageFiles so the generated props item is visible when NuGet builds the package.

Validated by packing with an isolated NuGet cache and checking the .nupkg contains build/GitHub.Copilot.SDK.props with the expected version.

[Copilot]

Pull request overview

Updates the .NET SDK project’s packaging pipeline so the generated GitHub.Copilot.SDK.props file (containing CopilotCliVersion) is included in the NuGet package build assets. This addresses the multi-targeting ordering issue where generating the props file before Pack was still too late for NuGet’s package file collection.

Changes:

• Move _GenerateVersionProps execution earlier by running it before NuGet’s _GetPackageFiles target.
• Ensure the dynamically generated build/GitHub.Copilot.SDK.props is visible to NuGet when it enumerates files to include in the .nupkg.

Show a summary per file

File	Description
dotnet/src/GitHub.Copilot.SDK.csproj	Adjusts target ordering so the generated .props file is included in the packed NuGet build assets.

Copilot's findings

• Files reviewed: 1/1 changed files
• Comments generated: 0

[github-actions]

Cross-SDK Consistency Review ✅

This PR makes a .NET-specific MSBuild build infrastructure fix — changing the BeforeTargets from Pack to _GetPackageFiles to ensure the generated GitHub.Copilot.SDK.props file is included in the NuGet package correctly.

This change has no API surface impact and is specific to .NET's MSBuild/NuGet packaging pipeline. There are no equivalent concepts in the Node.js, Python, or Go SDKs that would need corresponding changes.

No cross-SDK consistency issues found.

Generated by SDK Consistency Review Agent for issue #1387 · ● 850.5K · ◷