Update .gitignore to exclude TypeScript build info and add dist directory. Expand README with project overview, technology stack, prerequisites, and instructions for running and testing the application.

src/HSchool.ServiceDefaults/Extensions.cs

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+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Diagnostics.HealthChecks;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Diagnostics.HealthChecks;
+using Microsoft.Extensions.Logging;
+using OpenTelemetry;
+using OpenTelemetry.Metrics;
+using OpenTelemetry.Trace;
+
+namespace Microsoft.Extensions.Hosting;
+
+/// <summary>
+/// Common Aspire wiring: service discovery, resilience, health checks and OpenTelemetry.
+/// Referenced by every service project in the solution.
+/// See https://aka.ms/dotnet/aspire/service-defaults.
+/// </summary>
+public static class Extensions
+{
+    private const string HealthEndpointPath = "/health";
+    private const string AlivenessEndpointPath = "/alive";
+
+    public static TBuilder AddServiceDefaults<TBuilder>(this TBuilder builder)
+        where TBuilder : IHostApplicationBuilder
+    {
+        builder.ConfigureOpenTelemetry();
+        builder.AddDefaultHealthChecks();
+
+        builder.Services.AddServiceDiscovery();
+        builder.Services.ConfigureHttpClientDefaults(http =>
+        {
+            http.AddStandardResilienceHandler();
+            http.AddServiceDiscovery();
+        });
+
+        return builder;
+    }
+
+    public static TBuilder ConfigureOpenTelemetry<TBuilder>(this TBuilder builder)
+        where TBuilder : IHostApplicationBuilder
+    {
+        builder.Logging.AddOpenTelemetry(logging =>
+        {
+            logging.IncludeFormattedMessage = true;
+            logging.IncludeScopes = true;
+        });
+
+        builder.Services.AddOpenTelemetry()
+            .WithMetrics(metrics =>
+            {
+                metrics.AddAspNetCoreInstrumentation()
+                    .AddHttpClientInstrumentation()
+                    .AddRuntimeInstrumentation();
+            })
+            .WithTracing(tracing =>
+            {
+                tracing.AddSource(builder.Environment.ApplicationName)
+                    .AddAspNetCoreInstrumentation(options =>
+                        // Health probes would drown out the game traffic.
+                        options.Filter = context =>
+                            !context.Request.Path.StartsWithSegments(HealthEndpointPath)
+                            && !context.Request.Path.StartsWithSegments(AlivenessEndpointPath))
+                    .AddHttpClientInstrumentation();
+            });
+
+        builder.AddOpenTelemetryExporters();
+
+        return builder;
+    }
+
+    public static TBuilder AddDefaultHealthChecks<TBuilder>(this TBuilder builder)
+        where TBuilder : IHostApplicationBuilder
+    {
+        builder.Services.AddHealthChecks()
+            .AddCheck("self", () => HealthCheckResult.Healthy(), ["live"]);
+
+        return builder;
+    }
+
+    public static WebApplication MapDefaultEndpoints(this WebApplication app)
+    {
+        // Exposing health endpoints outside development has security implications:
+        // https://aka.ms/dotnet/aspire/healthchecks
+        if (app.Environment.IsDevelopment())
+        {
+            app.MapHealthChecks(HealthEndpointPath);
+
+            app.MapHealthChecks(AlivenessEndpointPath, new HealthCheckOptions
+            {
+                Predicate = registration => registration.Tags.Contains("live"),
+            });
+        }
+
+        return app;
+    }
+
+    private static TBuilder AddOpenTelemetryExporters<TBuilder>(this TBuilder builder)
+        where TBuilder : IHostApplicationBuilder
+    {
+        var useOtlpExporter = !string.IsNullOrWhiteSpace(builder.Configuration["OTEL_EXPORTER_OTLP_ENDPOINT"]);
+        if (useOtlpExporter)
+        {
+            builder.Services.AddOpenTelemetry().UseOtlpExporter();
+        }
+
+        return builder;
+    }
+}

src/HSchool.ServiceDefaults/HSchool.ServiceDefaults.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <RootNamespace>HSchool.ServiceDefaults</RootNamespace>
+    <IsAspireSharedProject>true</IsAspireSharedProject>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <FrameworkReference Include="Microsoft.AspNetCore.App" />
+
+    <PackageReference Include="Microsoft.Extensions.Http.Resilience" />
+    <PackageReference Include="Microsoft.Extensions.ServiceDiscovery" />
+    <PackageReference Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" />
+    <PackageReference Include="OpenTelemetry.Extensions.Hosting" />
+    <PackageReference Include="OpenTelemetry.Instrumentation.AspNetCore" />
+    <PackageReference Include="OpenTelemetry.Instrumentation.Http" />
+    <PackageReference Include="OpenTelemetry.Instrumentation.Runtime" />
+  </ItemGroup>
+
+</Project>