Add determinism tests for verdict artifact generation and update SHA256 sums script

- Implemented comprehensive tests for verdict artifact generation to ensure deterministic outputs across various scenarios, including identical inputs, parallel execution, and change ordering.
- Created helper methods for generating sample verdict inputs and computing canonical hashes.
- Added tests to validate the stability of canonical hashes, proof spine ordering, and summary statistics.
- Introduced a new PowerShell script to update SHA256 sums for files, ensuring accurate hash generation and file integrity checks.

src/VexHub/StellaOps.VexHub.WebService/Program.cs

@@ -3,6 +3,7 @@ using StellaOps.VexHub.Core.Extensions;
 using StellaOps.VexHub.Storage.Postgres.Extensions;
 using StellaOps.VexHub.WebService.Extensions;
 using StellaOps.VexHub.WebService.Middleware;
+using StellaOps.Router.AspNet;
 
 var builder = WebApplication.CreateBuilder(args);
 
@@ -44,6 +45,13 @@ builder.Services.AddAuthorization();
 builder.Services.AddEndpointsApiExplorer();
 builder.Services.AddOpenApi();
 
+// Stella Router integration
+var routerOptions = builder.Configuration.GetSection("VexHub:Router").Get<StellaRouterOptionsBase>();
+builder.Services.TryAddStellaRouter(
+    serviceName: "vexhub",
+    version: typeof(Program).Assembly.GetName().Version?.ToString() ?? "1.0.0",
+    routerOptions: routerOptions);
+
 var app = builder.Build();
 
 // Configure the HTTP request pipeline
@@ -61,6 +69,7 @@ app.UseVexHubRateLimiting();
 // Add authentication and authorization
 app.UseAuthentication();
 app.UseAuthorization();
+app.TryUseStellaRouter(routerOptions);
 
 // Map API endpoints
 app.MapVexHubEndpoints();
@@ -70,4 +79,7 @@ app.MapGet("/health", () => Results.Ok(new { Status = "Healthy", Service = "VexH
    .WithName("HealthCheck")
    .WithTags("Health");
 
+// Refresh Router endpoint cache
+app.TryRefreshStellaRouterEndpoints(routerOptions);
+
 app.Run();