chore: initialize standalone UPM package

Runtime/ShrinkEcsEventQueue.cs

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+#nullable enable
+
+using System;
+using ShrinkEventBus;
+using Unity.Collections;
+
+namespace ShrinkEventBus.Entities
+{
+    /// <summary>Burst-safe producer queue; playback enters the regular Bus instance.</summary>
+    public sealed class ShrinkEcsEventQueue<TEvent> : IDisposable where TEvent : unmanaged, IShrinkEvent
+    {
+        private NativeQueue<TEvent> _queue;
+
+        public ShrinkEcsEventQueue(Allocator allocator = Allocator.Persistent)
+        {
+            _queue = new NativeQueue<TEvent>(allocator);
+            Writer = new ShrinkEcsEventWriter<TEvent>(_queue.AsParallelWriter());
+        }
+
+        public ShrinkEcsEventWriter<TEvent> Writer { get; }
+
+        public int Playback(IShrinkEventBus bus)
+        {
+            if (bus == null)
+                throw new ArgumentNullException(nameof(bus));
+            var count = 0;
+            while (_queue.TryDequeue(out var eventData))
+            {
+                bus.Post(in eventData);
+                count++;
+            }
+            return count;
+        }
+
+        public void Dispose()
+        {
+            if (_queue.IsCreated)
+                _queue.Dispose();
+        }
+    }
+
+    public readonly struct ShrinkEcsEventWriter<TEvent> where TEvent : unmanaged, IShrinkEvent
+    {
+        private readonly NativeQueue<TEvent>.ParallelWriter _writer;
+
+        internal ShrinkEcsEventWriter(NativeQueue<TEvent>.ParallelWriter writer)
+        {
+            _writer = writer;
+        }
+
+        public void Post(in TEvent eventData) => _writer.Enqueue(eventData);
+    }
+}

Runtime/ShrinkEcsEventQueue.cs.meta

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Runtime/ShrinkEventBus.Entities.Runtime.asmdef

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+{
+  "name": "ShrinkEventBus.Entities.Runtime",
+  "rootNamespace": "ShrinkEventBus.Entities",
+  "references": [
+    "ShrinkEventBus.Runtime",
+    "Unity.Collections",
+    "Unity.Entities"
+  ],
+  "includePlatforms": [],
+  "excludePlatforms": [],
+  "allowUnsafeCode": true,
+  "autoReferenced": false
+}

Runtime/ShrinkEventBus.Entities.Runtime.asmdef.meta

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