Windows: add opt-in embedded Rivet build mode

Author: turinglambdaai

apps/windows/Taskly/Taskly.csproj

@@ -25,6 +25,14 @@
     <Version>1.0.0</Version>
     <AssemblyName>Taskly</AssemblyName>
     <ApplicationIcon>Assets\taskly.ico</ApplicationIcon>
+    <TasklyRepoRoot>$([System.IO.Path]::GetFullPath('$(MSBuildProjectDirectory)\..\..\..'))</TasklyRepoRoot>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(UseRivetBackend)' == 'true'">
+    <DefineConstants>$(DefineConstants);TASKLY_RIVET</DefineConstants>
+    <RivetRoot Condition="'$(RivetRoot)' == ''">$(RIVET_ROOT)</RivetRoot>
+    <TasklyGeneratedRivet Condition="'$(TasklyGeneratedRivet)' == ''">$(TasklyRepoRoot)\dotnet\GeneratedBackend.cs</TasklyGeneratedRivet>
+    <TasklyRivetBundle Condition="'$(TasklyRivetBundle)' == ''">$(TasklyRepoRoot)\.rivet\dotnet\windows-x64</TasklyRivetBundle>
   </PropertyGroup>
 
   <ItemGroup>
@@ -38,6 +46,14 @@
     <PackageReference Include="Velopack" Version="1.0.0" />
   </ItemGroup>
 
+  <ItemGroup Condition="'$(UseRivetBackend)' == 'true'">
+    <ProjectReference Include="$(RivetRoot)\platform\dotnet\Rivet.Runtime\Rivet.Runtime.csproj" />
+    <Compile Include="$(TasklyGeneratedRivet)" Link="Generated\GeneratedBackend.cs" />
+    <RivetBootFile Include="$(TasklyRivetBundle)\runtime\**\*.*" />
+    <RivetResourceFile Include="$(TasklyRivetBundle)\res\**\*.*" />
+    <RivetNativeFile Include="$(TasklyRivetBundle)\*.dll" />
+  </ItemGroup>
+
   <ItemGroup>
     <Content Include="Strings\*.json">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
@@ -54,4 +70,24 @@
     </Content>
   </ItemGroup>
 
+  <Target Name="ValidateTasklyRivet" BeforeTargets="CoreCompile" Condition="'$(UseRivetBackend)' == 'true'">
+    <Error Condition="'$(RivetRoot)' == '' Or !Exists('$(RivetRoot)\platform\dotnet\Rivet.Runtime\Rivet.Runtime.csproj')"
+           Text="UseRivetBackend=true requires RivetRoot (or RIVET_ROOT) to point to the pinned Rivet checkout." />
+    <Error Condition="!Exists('$(TasklyGeneratedRivet)')"
+           Text="Taskly generated Rivet API is missing. Run 'raco rivet build-dotnet' from the Taskly repository first." />
+    <Error Condition="!Exists('$(TasklyRivetBundle)\rivet_native.dll')"
+           Text="Taskly embedded Rivet bundle is missing. Run 'raco rivet build-dotnet' from the Taskly repository first." />
+  </Target>
+
+  <Target Name="CopyTasklyRivetRuntime" AfterTargets="Build" Condition="'$(UseRivetBackend)' == 'true'">
+    <MakeDir Directories="$(OutDir)rivet\runtime;$(OutDir)rivet\res" />
+    <Copy SourceFiles="@(RivetBootFile)"
+          DestinationFiles="@(RivetBootFile->'$(OutDir)rivet\runtime\%(RecursiveDir)%(Filename)%(Extension)')" />
+    <Copy SourceFiles="@(RivetResourceFile)"
+          DestinationFiles="@(RivetResourceFile->'$(OutDir)rivet\res\%(RecursiveDir)%(Filename)%(Extension)')" />
+    <!-- The native bridge and libracketcs dependency must be beside Taskly.exe
+         so the Windows loader can resolve them before managed startup. -->
+    <Copy SourceFiles="@(RivetNativeFile)" DestinationFolder="$(OutDir)" />
+  </Target>
+
 </Project>