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. Replaces the earlier NuGet.config-based attempt, which broke restore (NU1301) whenever the env var was unset.

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

[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 655c98ed-330d-423b-ba63-615d4a396814

📥 Commits

Reviewing files that changed from the base of the PR and between b5c7d15 and 064cfeb.

📒 Files selected for processing (2)

• Directory.Build.props
• NuGet.config

💤 Files with no reviewable changes (1)

• NuGet.config

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Walkthrough

The pull request modifies NuGet package source configuration. A new Directory.Build.props file enables conditional local package source management via the NOSCORE_LOCAL_PACKAGES property, while NuGet.config removes a hardcoded local package source entry.

Changes

Cohort / File(s)	Summary
NuGet Configuration Directory.Build.props, NuGet.config	Directory.Build.props (new) adds conditional MSBuild property to extend RestoreAdditionalProjectSources when NOSCORE_LOCAL_PACKAGES is set. NuGet.config removes the local package source entry, retaining only the nuget.org source.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately reflects the main change: reverting a previous addition that configured a local NuGet source using NOSCORE_LOCAL_PACKAGES, and clearly explains the reason (breaks restore when env var is unset).
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

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

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