Add Amazon.Lambda.DurableExecution project scaffolding

Establishes the package metadata for the durable execution SDK:
src project (net8.0, trimmable, signed) and the matching test project
with InternalsVisibleTo wired up. No public API is added yet — a
single sanity test verifies the assembly loads.

Subsequent PRs will add the actual SDK contents on top of this scaffolding.

stack-info: PR: #2359, branch: GarrettBeatty/stack/1

Author: GarrettBeatty

Libraries/src/Amazon.Lambda.DurableExecution/Amazon.Lambda.DurableExecution.csproj

@@ -0,0 +1,34 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <Import Project="..\..\..\buildtools\common.props" />
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <Description>Amazon Lambda .NET SDK for Durable Execution - write multi-step workflows that persist state automatically.</Description>
+    <AssemblyTitle>Amazon.Lambda.DurableExecution</AssemblyTitle>
+    <Version>0.1.0</Version>
+    <AssemblyName>Amazon.Lambda.DurableExecution</AssemblyName>
+    <PackageId>Amazon.Lambda.DurableExecution</PackageId>
+    <PackageTags>AWS;Amazon;Lambda;Durable;Workflow</PackageTags>
+    <IsTrimmable>true</IsTrimmable>
+    <EnableTrimAnalyzer>true</EnableTrimAnalyzer>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <AssemblyAttribute Include="System.Runtime.CompilerServices.InternalsVisibleToAttribute">
+      <_Parameter1>Amazon.Lambda.DurableExecution.Tests, PublicKey="0024000004800000940000000602000000240000525341310004000001000100db5f59f098d27276c7833875a6263a3cc74ab17ba9a9df0b52aedbe7252745db7274d5271fd79c1f08f668ecfa8eaab5626fa76adc811d3c8fc55859b0d09d3bc0a84eecd0ba891f2b8a2fc55141cdcc37c2053d53491e650a479967c3622762977900eddbf1252ed08a2413f00a28f3a0752a81203f03ccb7f684db373518b4"</_Parameter1>
+    </AssemblyAttribute>
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Amazon.Lambda.Core\Amazon.Lambda.Core.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="AWSSDK.Lambda" Version="4.0.13.1" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="8.0.0" />
+  </ItemGroup>
+
+</Project>

Libraries/src/Amazon.Lambda.DurableExecution/AssemblyMarker.cs

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+namespace Amazon.Lambda.DurableExecution;
+
+internal static class AssemblyMarker
+{
+}

Libraries/test/Amazon.Lambda.DurableExecution.Tests/Amazon.Lambda.DurableExecution.Tests.csproj

@@ -0,0 +1,28 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <AssemblyName>Amazon.Lambda.DurableExecution.Tests</AssemblyName>
+    <PackageId>Amazon.Lambda.DurableExecution.Tests</PackageId>
+    <GenerateRuntimeConfigurationFiles>true</GenerateRuntimeConfigurationFiles>
+    <AssemblyOriginatorKeyFile>..\..\..\buildtools\public.snk</AssemblyOriginatorKeyFile>
+    <SignAssembly>true</SignAssembly>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\Amazon.Lambda.DurableExecution\Amazon.Lambda.DurableExecution.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.0.0" />
+    <PackageReference Include="xunit" Version="2.4.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Service Include="{82a7f48d-3b50-4b1e-b82e-3ada8210c358}" />
+  </ItemGroup>
+
+</Project>

Libraries/test/Amazon.Lambda.DurableExecution.Tests/AssemblyLoadTests.cs

@@ -0,0 +1,13 @@
+using Xunit;
+
+namespace Amazon.Lambda.DurableExecution.Tests;
+
+public class AssemblyLoadTests
+{
+    [Fact]
+    public void DurableExecutionAssembly_Loads()
+    {
+        var assembly = typeof(AssemblyMarker).Assembly;
+        Assert.Equal("Amazon.Lambda.DurableExecution", assembly.GetName().Name);
+    }
+}