Migrate CreateWindowsSdkKnownFrameworkReferences to IMultiThreadableTask#53951

Draft

SimaTian wants to merge 4 commits intodotnet:mainfrom

SimaTian:migrate-create-windows-sdk-known-framework-references

Commits on Apr 29, 2026

Migrate CreateWindowsSdkKnownFrameworkReferences to IMultiThreadableTask

SimaTian
and
Copilot
committed
Address review: fix nullable annotation (CS8632) and test assertions

SimaTian
and
Copilot
committed
Strengthen Windows SDK threading tests

SimaTian
and
Copilot
committed

Commits on May 6, 2026

Replace SDK multi-threading shims with TaskEnvironment.Fallback

SimaTian
and
Copilot
committed