Two surgical changes inside the dotnet-foundry-hosted-it job:
1. Replace dotnet build <slnx> -f net10.0 with dotnet build <test.csproj>. The test csproj pins TargetFrameworks=net10.0 and its ProjectReference closure gives MSBuild a single-rooted graph, eliminating the duplicate inner-builds that race on bin/obj. Drops the two New-FilteredSolution.ps1 steps.
2. In it-build-image.ps1, drop the -UsePrebuiltProjectReferences switch and always pass --no-dependencies to dotnet publish. Publish now resolves TestContainer's framework refs by reading prebuilt DLLs and never re-touches them. Replaces the partial-mitigation in PR #5689 with a structural fix.
Local validation confirmed published Foundry.dll has identical mtime and bytes as the prebuild output.
Roger Barreto
bbe2e91dcd