落地无头规则引擎与局内内容，便于命令行复现对战。

规则、卡包与测试放在同一套核心里，避免表现层自行结算。

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/Game.Core.Tests/Game.Core.Tests.csproj

@@ -0,0 +1,21 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <IsPackable>false</IsPackable>
+    <RootNamespace>Game.Core.Tests</RootNamespace>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
+    <PackageReference Include="xunit" Version="2.9.2" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\Game.Core\Game.Core.csproj" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="..\..\content\**\*" CopyToOutputDirectory="PreserveNewest" Link="content\%(RecursiveDir)%(Filename)%(Extension)" />
+  </ItemGroup>
+</Project>