Consume CultMath from CultLib

Fensalir.sln

@@ -9,7 +9,7 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Aquarium.Engine.Contracts",
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Aquarium.Engine", "src\Aquarium.Engine\Aquarium.Engine.csproj", "{51FE01D8-9EEF-46B2-8D8C-3307AC2221C1}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "CultMath", "..\CultMath\src\CultMath\CultMath.csproj", "{0089E341-25F2-43FC-8FD9-CBD1AE646D91}"
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "CultMath", "..\CultLib\packages\cultmath\src\CultMath\CultMath.csproj", "{0089E341-25F2-43FC-8FD9-CBD1AE646D91}"
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Aquarium.Sample.Minimal", "src\Aquarium.Sample.Minimal\Aquarium.Sample.Minimal.csproj", "{7564E6C2-FF01-4B5B-8C2B-F9CD796858BA}"
 EndProject

README.md

@@ -153,8 +153,8 @@ Requirements:
 
 - Windows
 - .NET SDK matching `global.json`
-- sibling repos currently expected at `E:\Projects\CultMath` and
-  `E:\Projects\CultLib`
+- sibling `CultLib` repo currently expected at `E:\Projects\CultLib`; CultMath
+  is consumed from `CultLib/packages/cultmath`
 
 ```powershell
 dotnet build Fensalir.sln

src/Aquarium.Engine/Aquarium.Engine.csproj

@@ -1,6 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
+    <CultLibRoot Condition="'$(CultLibRoot)' == ''">$(MSBuildThisFileDirectory)..\..\..\CultLib</CultLibRoot>
     <OutputType>WinExe</OutputType>
     <TargetFramework>net10.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
@@ -22,7 +23,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <ProjectReference Include="..\..\..\CultMath\src\CultMath\CultMath.csproj" />
+    <ProjectReference Include="$(CultLibRoot)\packages\cultmath\src\CultMath\CultMath.csproj" />
   </ItemGroup>
 
   <ItemGroup>