Add unit tests for Router configuration and transport layers

- Implemented tests for RouterConfig, RoutingOptions, StaticInstanceConfig, and RouterConfigOptions to ensure default values are set correctly.
- Added tests for RouterConfigProvider to validate configurations and ensure defaults are returned when no file is specified.
- Created tests for ConfigValidationResult to check success and error scenarios.
- Developed tests for ServiceCollectionExtensions to verify service registration for RouterConfig.
- Introduced UdpTransportTests to validate serialization, connection, request-response, and error handling in UDP transport.
- Added scripts for signing authority gaps and hashing DevPortal SDK snippets.

examples/router/src/Examples.Gateway/Examples.Gateway.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <LangVersion>preview</LangVersion>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\..\..\src\Gateway\StellaOps.Gateway.WebService\StellaOps.Gateway.WebService.csproj" />
+    <ProjectReference Include="..\..\..\..\src\__Libraries\StellaOps.Router.Transport.InMemory\StellaOps.Router.Transport.InMemory.csproj" />
+    <ProjectReference Include="..\..\..\..\src\__Libraries\StellaOps.Router.Config\StellaOps.Router.Config.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Content Include="router.yaml" CopyToOutputDirectory="PreserveNewest" />
+  </ItemGroup>
+</Project>

examples/router/src/Examples.Gateway/Program.cs

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+using StellaOps.Gateway.WebService;
+using StellaOps.Gateway.WebService.Authorization;
+using StellaOps.Gateway.WebService.Middleware;
+using StellaOps.Router.Config;
+using StellaOps.Router.Transport.InMemory;
+
+var builder = WebApplication.CreateBuilder(args);
+
+// Router configuration from YAML
+builder.Services.AddRouterConfig(options =>
+{
+    options.ConfigPath = "router.yaml";
+    options.EnableHotReload = true;
+});
+
+// Gateway routing services
+builder.Services.AddGatewayRouting(builder.Configuration);
+
+// In-memory transport for demo (can switch to TCP/TLS for production)
+builder.Services.AddInMemoryTransport();
+
+// Authority integration (no-op for demo)
+builder.Services.AddNoOpAuthorityIntegration();
+
+var app = builder.Build();
+
+// Middleware pipeline
+app.UseForwardedHeaders();
+app.UseMiddleware<PayloadLimitsMiddleware>();
+app.UseAuthentication();
+app.UseMiddleware<EndpointResolutionMiddleware>();
+app.UseClaimsAuthorization();
+app.UseMiddleware<RoutingDecisionMiddleware>();
+
+// Simple health endpoint
+app.MapGet("/health", () => Results.Ok(new { status = "healthy" }));
+
+// Catch-all for routed requests
+app.MapFallback(async context =>
+{
+    // The RoutingDecisionMiddleware would have dispatched the request
+    // If we reach here, no route was found
+    context.Response.StatusCode = 404;
+    await context.Response.WriteAsJsonAsync(new { error = "Not Found", message = "No matching endpoint" });
+});
+
+app.Run();
+
+// Partial class for WebApplicationFactory integration testing
+namespace Examples.Gateway
+{
+    public partial class Program { }
+}

examples/router/src/Examples.Gateway/appsettings.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*",
+  "GatewayNode": {
+    "Region": "demo",
+    "NodeId": "gw-demo-01"
+  }
+}

examples/router/src/Examples.Gateway/router.yaml

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+# Router Configuration for Example Gateway
+# This file configures how the gateway routes requests to microservices
+
+gateway:
+  nodeId: "gw-demo-01"
+  region: "demo"
+  listenPort: 8080
+
+  # Payload limits
+  payloadLimits:
+    maxRequestBodyBytes: 10485760  # 10 MB
+    maxStreamingChunkBytes: 65536   # 64 KB
+
+  # Health monitoring
+  healthMonitoring:
+    staleThreshold: "00:00:30"
+    checkInterval: "00:00:05"
+
+# Transport configuration
+transports:
+  # In-memory transport (for demo)
+  inMemory:
+    enabled: true
+
+  # TCP transport (production)
+  # tcp:
+  #   enabled: true
+  #   port: 5100
+  #   backlog: 100
+
+  # TLS transport (production with encryption)
+  # tls:
+  #   enabled: true
+  #   port: 5101
+  #   certificatePath: "certs/gateway.pfx"
+  #   certificatePassword: "demo"
+
+# Routing configuration
+routing:
+  # Default routing algorithm
+  algorithm: "round-robin"
+
+  # Region affinity (prefer local microservices)
+  regionAffinity: true
+  affinityWeight: 0.8
+
+# Logging
+logging:
+  level: "Information"
+  requestLogging: true