v6.18.1

Added

• Multi-target net9.0-android and net10.0-android alongside net8.0-android

Changed

• Bump AppsFlyer Android SDK to 6.18.1
• pack.sh now builds each target framework with the .NET SDK that supports it (net8.0-android requires the .NET 8 SDK; net9/net10 require .NET 10) and packs the combined outputs into one NuGet package
• global.json now pins the .NET 10 SDK
• run-sample.sh and pack.sh -s/-t now build the sample app with the .NET 8 SDK (it still targets net8.0-android only) instead of inheriting the repo-wide .NET 10 pin, and abort instead of installing a stale APK if the build fails

Fixed

• pack.sh no longer produces a NuGet package missing the AAR (Java implementation classes) for net8.0-android — dotnet pack --no-build was deduplicating the byte-identical AAR across target frameworks and dropping it from some lib/<tfm> folders; the script now detects and repairs this after packing