Isolate manual artifact validation without package publication

ACTION-TESTING.md

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+# Manual artifact validation
+
+Daily schedules are disabled during validation. No NuGet.org publication or
+GitHub Release is requested by the manual dispatcher on main.
+
+- skia3: nuget-static-graphics.yml; latest stable SkiaSharp 3.
+- skia4: nuget-static-graphics.yml; latest stable SkiaSharp 4.
+- avalonia-native: nuget-avalonia-native.yml; latest stable Avalonia 11 and 12.
+
+Download staticlink-avalonia-nuget and avalonia-smoke-<RID> from each graphics run.
+Download staticlink-avalonia-native-<version> and
+avalonia-native-smoke-<AvaloniaVersion>-<RID> from the native run.
+Native archives and source locks are also retained as Actions artifacts.
+
+Graphics macOS smoke tests use the already published AvaloniaNative revision 1
+by default, so the graphics builds do not require the experimental native
+revision 2 to be published. The native branch validates its own local revision 2
+package separately. To test both experimental packages together, put both
+downloaded packages in a local NuGet feed and reference their exact versions.
+
+Smoke executables are retained even if a later runtime validation fails.
+An artifact is not evidence that all validation gates passed; check job results.
+
+The daily-native-release workflow on main currently supports manual dispatch
+only. Its three matrix jobs check out their own branch and dispatch independently.
+Use force_build=true to rebuild published versions for testing.
+After validation, enable the schedule on main only; non-default branches cannot
+run their own GitHub cron schedules. Publication remains an explicit opt-in.
+While publication is disabled, an unpublished package may be rebuilt on every
+check; add successful-run tracking before enabling artifact-only daily builds
+if avoiding repeated builds is required.
+