Gitea Actions resolves bare action names against the local Gitea
instance by default. Using the full github.com URL makes the runner
pull the action from upstream.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
.slnx requires .NET 9 SDK / MSBuild 17.8+. The Gitea runner has only
.NET 8, so build the test project directly — its ProjectReference
transitively builds ClaudeMailbox.csproj.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>