feat: ChunkStreamer tracks failed chunks to prevent retry storms

World/Streaming/ChunkStreamer.cs

@@ -29,6 +29,7 @@ public sealed class ChunkStreamer : IDisposable
     private readonly PriorityQueue<Vector3i, int> _pendingLoad = new();
     private readonly ConcurrentQueue<ChunkJobResult> _completed = new();
     private readonly Queue<Vector3i> _pendingUnload = new();
+    private readonly HashSet<Vector3i> _failed = new();
 
     private Vector3i _lastPlayerChunk = new(int.MinValue, int.MinValue, int.MinValue);
     private int _inFlight;
@@ -118,6 +119,7 @@ public sealed class ChunkStreamer : IDisposable
 
         foreach (var pos in target)
         {
+            if (this._failed.Contains(pos)) continue;
             if (this._tracked.Add(pos))
             {
                 int priority = (pos.X - p.X) * (pos.X - p.X)
@@ -162,6 +164,7 @@ public sealed class ChunkStreamer : IDisposable
             }
             this._world.RemoveChunk(pos);
             this._ready.Remove(pos);
+            this._failed.Remove(pos);
             Log.Debug("Unloaded {Pos}", pos);
         }
     }
@@ -190,6 +193,7 @@ public sealed class ChunkStreamer : IDisposable
     {
         if (result.Error != null || result.Mesh == null)
         {
+            this._failed.Add(result.Pos);
             Log.Error(result.Error, "Chunk {Pos} failed to load", result.Pos);
             return;
         }