chore: support local NuGet source via NOSCORE_LOCAL_PACKAGES env var

[erwan-joly]

Summary

• Adds Directory.Build.props with a conditional RestoreAdditionalProjectSources that activates only when NOSCORE_LOCAL_PACKAGES is set.
• No runtime cost for contributors who don't opt in — the property group is skipped, restore uses nuget.org only.
• To use: setx NOSCORE_LOCAL_PACKAGES C:\LocalPackages, restart shell/VS, drop .nupkg files into the folder.

Test plan

• dotnet restore succeeds with NOSCORE_LOCAL_PACKAGES unset.
• dotnet restore with NOSCORE_LOCAL_PACKAGES pointing to a folder with a .nupkg picks it up.

Generated with Claude Code

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ℹ️ Review info

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📥 Commits

Reviewing files that changed from the base of the PR and between addd3bd and bc88d2f.

📒 Files selected for processing (1)

• Directory.Build.props

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/nuget-local-source

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