chore: add local NuGet source via NOSCORE_LOCAL_PACKAGES env var

[erwan-joly]

Summary

• Adds a local NuGet package source that reads the NOSCORE_LOCAL_PACKAGES environment variable.
• When the variable is unset the source resolves to nothing and nuget.org is used — contributors who don't opt in are unaffected.
• Set NOSCORE_LOCAL_PACKAGES to a folder (e.g. C:\LocalPackages) to consume unpublished .nupkg builds locally without editing NuGet.config.

Test plan

• dotnet restore succeeds with NOSCORE_LOCAL_PACKAGES unset.
• dotnet restore succeeds with NOSCORE_LOCAL_PACKAGES pointing to a folder containing a .nupkg override.

Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

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Run ID: 4c8e1973-d159-43ad-87d5-ba18d5e0595a

📥 Commits

Reviewing files that changed from the base of the PR and between 4101793 and 446d126.

📒 Files selected for processing (1)

• NuGet.config

✨ Finishing Touches

🧪 Generate unit tests (beta)

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

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