doctor enhancements, setup, enhancements, ui functionality and design consolidation and , test projects fixes , product advisory attestation/rekor and delta verfications enhancements

src/__Libraries/StellaOps.DeltaVerdict/Validation/ValidationServiceCollectionExtensions.cs

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+// -----------------------------------------------------------------------------
+// ValidationServiceCollectionExtensions.cs
+// Sprint: SPRINT_20260118_031_LIB_input_pinning_trusted_vex_keys
+// Task: TASK-031-006 - Implement Adversarial Input Validation
+// Description: DI registration for adversarial validation services
+// -----------------------------------------------------------------------------
+
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace StellaOps.DeltaVerdict.Validation;
+
+/// <summary>
+/// Extension methods for registering adversarial validation services.
+/// </summary>
+public static class ValidationServiceCollectionExtensions
+{
+    /// <summary>
+    /// Adds adversarial input validation to the service collection.
+    /// </summary>
+    /// <param name="services">The service collection.</param>
+    /// <param name="configuration">Optional configuration.</param>
+    /// <returns>The service collection for chaining.</returns>
+    public static IServiceCollection AddAdversarialInputValidation(
+        this IServiceCollection services,
+        IConfiguration? configuration = null)
+    {
+        if (configuration != null)
+        {
+            services.Configure<AdversarialValidationPolicy>(
+                configuration.GetSection(AdversarialValidationPolicy.SectionName));
+        }
+
+        services.AddSingleton<IAdversarialInputValidator, AdversarialInputValidator>();
+
+        return services;
+    }
+
+    /// <summary>
+    /// Adds adversarial input validation with custom policy.
+    /// </summary>
+    /// <param name="services">The service collection.</param>
+    /// <param name="configurePolicy">Policy configuration delegate.</param>
+    /// <returns>The service collection for chaining.</returns>
+    public static IServiceCollection AddAdversarialInputValidation(
+        this IServiceCollection services,
+        Action<AdversarialValidationPolicy> configurePolicy)
+    {
+        services.Configure(configurePolicy);
+        services.AddSingleton<IAdversarialInputValidator, AdversarialInputValidator>();
+
+        return services;
+    }
+
+    /// <summary>
+    /// Adds adversarial input validation with a predefined policy.
+    /// </summary>
+    /// <param name="services">The service collection.</param>
+    /// <param name="policy">The validation policy to use.</param>
+    /// <returns>The service collection for chaining.</returns>
+    public static IServiceCollection AddAdversarialInputValidation(
+        this IServiceCollection services,
+        AdversarialValidationPolicy policy)
+    {
+        services.AddSingleton(Microsoft.Extensions.Options.Options.Create(policy));
+        services.AddSingleton<IAdversarialInputValidator, AdversarialInputValidator>();
+
+        return services;
+    }
+}