Nucleic: Windows Port 1

NucleicBroker/NucleicBroker.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <!-- nucleic-brokerd (docs/WINDOWS_PORT.md §2.3, §3.3): the C# child process of
+       nucleic-hostd that owns every Microsoft.WSL.Containers (wslc) call, exposed to Swift
+       as NDJSON JSON-RPC 2.0 over stdio.
+
+       The wslc WinRT surface is isolated behind IWslc, and the REAL facade is compiled only
+       when -p:UseWslc=true (a Windows machine with the preview NuGet reachable): the API is
+       public preview with breaking changes expected, and the M1 spike validates it. Every
+       other build — Linux CI, the fake-backed unit tests — compiles the portable core plus
+       an "unavailable" facade, so broker logic and RPC surface are testable everywhere. -->
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <AssemblyName>nucleic-brokerd</AssemblyName>
+    <RootNamespace>NucleicBroker</RootNamespace>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(UseWslc)' == 'true'">
+    <TargetFramework>net9.0-windows10.0.26100.0</TargetFramework>
+    <DefineConstants>$(DefineConstants);USE_WSLC</DefineConstants>
+  </PropertyGroup>
+
+  <ItemGroup Condition="'$(UseWslc)' != 'true'">
+    <Compile Remove="Wslc/**/*.cs" />
+  </ItemGroup>
+
+  <ItemGroup Condition="'$(UseWslc)' == 'true'">
+    <!-- Version-pinned (docs/WINDOWS_PORT.md §15): bump deliberately per release, never
+         float — the API is preview and breaking changes must be absorbed behind IWslc. -->
+    <PackageReference Include="Microsoft.WSL.Containers" Version="[0.1.0-preview.1]" />
+  </ItemGroup>
+
+</Project>