@

Add MrGameEng.AI utility-AI module; format codebase with CSharpier

New MrGameEng.AI module (ResponseCurve, Consideration, UtilityAction,
UtilityAi selector, Blackboard) plus CSharpier formatting applied across
the whole engine. Documents the CSharpier convention in CLAUDE.md.
@

tests/MrGameEng.Mods.Tests/ModLoaderTests.cs

@@ -18,7 +18,8 @@ public sealed class ModLoaderTests : IDisposable
         var deps = string.Join(", ", dependencies.Select(d => $"\"{d}\""));
         File.WriteAllText(
             Path.Combine(aboutDir, "About.json"),
-            $$"""{ "id": "{{id}}", "name": "{{id}} mod", "version": "1.0", "dependencies": [{{deps}}] }""");
+            $$"""{ "id": "{{id}}", "name": "{{id}} mod", "version": "1.0", "dependencies": [{{deps}}] }"""
+        );
     }
 
     [Fact]