sln build fix (again), tests fixes, audit work and doctors work

src/__Libraries/StellaOps.Doctor.Plugins.Integration/DependencyInjection/IntegrationPluginExtensions.cs

@@ -0,0 +1,20 @@
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.DependencyInjection.Extensions;
+using StellaOps.Doctor.Plugins;
+
+namespace StellaOps.Doctor.Plugins.Integration.DependencyInjection;
+
+/// <summary>
+/// Extension methods for registering the Integration plugin.
+/// </summary>
+public static class IntegrationPluginExtensions
+{
+    /// <summary>
+    /// Adds the Doctor Integration plugin to the service collection.
+    /// </summary>
+    public static IServiceCollection AddDoctorIntegrationPlugin(this IServiceCollection services)
+    {
+        services.TryAddEnumerable(ServiceDescriptor.Singleton<IDoctorPlugin, IntegrationPlugin>());
+        return services;
+    }
+}