Directory.Build.props

<Project>
  <!--
    System.Reactive 7.0.0+ refuses to build cleanly against packages.config
    projects (see System.Reactive.PackagesConfigCheck.targets) and instead
    emits an "unsupported scenario" warning on every build of every project
    that references it. This repository intentionally keeps its legacy
    non-SDK VSTO / .NET Framework 4.8.1 projects on packages.config (see
    .claude/rules/csharp.md) rather than migrating to PackageReference, so
    the warning is accepted here as a known, deliberate trade-off rather than
    fixed by migration. RxUseUnsupportedPackagesConfig=true is the package's
    own documented suppression switch for this exact scenario. See issue #730
    and docs/features/active/2026-09-02-ci-build-infra-debt-730/ for the
    accepted-trade-off rationale.
  -->
  <PropertyGroup>
    <RxUseUnsupportedPackagesConfig>true</RxUseUnsupportedPackagesConfig>
  </PropertyGroup>
</Project>