Plugin.cs:171-172 hardcoded the version into the schema-gate
InvalidOperationException string. The follow-up rename in v1.4.7 will
move this to Plugin.Interface.Manifest.AssemblyVersion so this commit
stops happening every cycle, but for v1.4.6 the bare version bump is
the smallest change.
Also picks up a one-line csharpier reflow on UrlValidation.cs
collapsed by the format pass.