testing building some core systems

- serialization
- chunks
- parralelfor test

Nerfed.Runtime/Scene/Streaming/ChunkTeardownSystem.cs

@@ -0,0 +1,35 @@
+using MoonTools.ECS;
+using System;
+
+namespace Nerfed.Runtime.Scene.Streaming;
+
+/// <summary>
+/// A centralized cleanup system for slowly destroying chunk entities to avoid frame stutters.
+/// </summary>
+public class ChunkTeardownSystem : MoonTools.ECS.System
+{
+    private readonly Filter _unloadedFilter;
+
+    // Adjustable limit to prevent massive stutters when unloading chunks.
+    public int MaxEntitiesToDestroyPerFrame { get; set; } = 250;
+
+    public ChunkTeardownSystem(World world) : base(world)
+    {
+        _unloadedFilter = FilterBuilder
+            .Include<ChunkUnloadPendingTag>()
+            .Build();
+    }
+
+    public override void Update(TimeSpan delta)
+    {
+        int destroyed = 0;
+
+        foreach (var entity in _unloadedFilter.Entities)
+        {
+            if (destroyed >= MaxEntitiesToDestroyPerFrame) break;
+
+            Destroy(entity);
+            destroyed++;
+        }
+    }
+}