Validate actions/upload-artifact v6 upgrade - no changes required

[Copilot]

Dependabot upgraded actions/upload-artifact from v5 to v6 (released 2025-12-12). Analysis confirms the upgrade is correct and complete.

Verification Results

• Node.js 24 requirement: GitHub-hosted runners (ubuntu-latest, windows-latest, macos-latest) support Node.js 24 via runner v2.327.1+
• Artifact action alignment:
  • actions/upload-artifact: v5 → v6 ✓
  • actions/download-artifact: already v6 ✓
  • dawidd6/action-download-artifact@v11: compatible ✓
• No breaking changes: Artifact names use unique matrix variables; no duplicate upload issues
• No workflow modifications needed: All changes made by Dependabot

What Changed

# build.yml, code-coverage.yml, package.yml
- uses: actions/upload-artifact@v5  # before
+ uses: actions/upload-artifact@v6  # after

Ready to merge.

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