Note that init read-only presentation depends on the runtime's modreq

IsInitOnly reads the IsExternalInit required modifier, which is unverified on
Unity's Mono. Where it is not reported, init members show editable; reflection
assigns them anyway, so edits still round-trip. No code change: no cheaper
robust check exists.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/GameCult.Caching/CultInspectorModel.cs

@@ -612,7 +612,8 @@ namespace GameCult.Caching
         private static int Ancestry(Type? type) => type == null ? 0 : 1 + Ancestry(type.BaseType);
 
         // `init` is a setter whose return carries the IsExternalInit modreq; the language contract, matched by name because
-        // netstandard2.1 does not ship the type.
+        // netstandard2.1 does not ship the type. A runtime that does not report the modreq (unverified on Unity's Mono) shows
+        // init members editable instead of read-only; SetValue still assigns them, so their edits round-trip either way.
         private static bool IsInitOnly(MethodInfo setter) =>
             setter.ReturnParameter.GetRequiredCustomModifiers().Any(modifier => modifier.FullName == "System.Runtime.CompilerServices.IsExternalInit");