feat(oecs): improve serialization and add snapshot tests

Enhance the OECS framework to support more robust component
deserialization during world serialization. This includes adding
boxed component support and a runtime fallback for component
discovery.

Additionally, introduces snapshot testing patterns for Blackjack
and TicTacToe to allow for manual verification of world state and
reactivity logs.

Game.Blackjack/Blackjack.csproj

@@ -9,9 +9,15 @@
     <ProjectReference Include="..\OECS\OECS.csproj" />
   </ItemGroup>
 
+  <!-- Source generator: referenced as a built DLL. -->
+  <Target Name="EnsureSourceGenBuilt" BeforeTargets="CoreCompile">
+    <MSBuild Projects="..\OECS.SourceGen\OECS.SourceGen.csproj"
+             Targets="Build"
+             Properties="Configuration=$(Configuration)" />
+  </Target>
+
   <ItemGroup>
-    <ProjectReference Include="..\OECS.SourceGen\OECS.SourceGen.csproj"
-                      OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
+    <Analyzer Include="..\OECS.SourceGen\bin\$(Configuration)\netstandard2.0\OECS.SourceGen.dll" />
   </ItemGroup>
 
 </Project>