feat: make Unity integration optional

Integration/Runtime.meta

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+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
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Integration/Runtime/ShrinkEventBus.Integration.Runtime.asmdef

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+{
+  "name": "ShrinkEventBus.Integration.Runtime",
+  "rootNamespace": "ShrinkEventBus.Integration",
+  "references": [
+    "ShrinkEventBus.Runtime",
+    "ShrinkRuntime.Abstractions"
+  ],
+  "autoReferenced": true,
+  "defineConstraints": [
+    "SHRINK_EVENTBUS_HAS_SHARED_RUNTIME"
+  ],
+  "versionDefines": [
+    {
+      "name": "com.cneicy.shrink-runtime-abstractions",
+      "expression": "0.1.0",
+      "define": "SHRINK_EVENTBUS_HAS_SHARED_RUNTIME"
+    }
+  ]
+}

Integration/Runtime/ShrinkEventBus.Integration.Runtime.asmdef.meta

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+fileFormatVersion: 2
+guid: 86c48423db2e41e1b208c468296b7faf

Integration/Runtime/ShrinkSharedMainThreadDispatcher.cs

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+#if SHRINK_EVENTBUS_HAS_SHARED_RUNTIME
+using System;
+using ShrinkSDK.Runtime;
+
+namespace ShrinkEventBus.Integration
+{
+    public sealed class ShrinkSharedMainThreadDispatcher : IShrinkEventBusMainThreadDispatcher
+    {
+        private readonly IShrinkMainThreadDispatcher _dispatcher;
+
+        public ShrinkSharedMainThreadDispatcher(IShrinkMainThreadDispatcher dispatcher)
+        {
+            _dispatcher = dispatcher ?? throw new ArgumentNullException(nameof(dispatcher));
+        }
+
+        public bool IsMainThread => _dispatcher.IsMainThread;
+        public bool TryPost(Action action) => _dispatcher.TryPost(action);
+    }
+}
+#endif

Integration/Runtime/ShrinkSharedMainThreadDispatcher.cs.meta

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Integration/Tests.meta

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+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}

Integration/Tests/SharedDispatcherTests.cs

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+#if SHRINK_EVENTBUS_HAS_SHARED_RUNTIME
+using System;
+using NUnit.Framework;
+using ShrinkSDK.Runtime;
+
+namespace ShrinkEventBus.Integration.Tests
+{
+    public sealed class SharedDispatcherTests
+    {
+        private sealed class Dispatcher : IShrinkMainThreadDispatcher
+        {
+            public bool IsMainThread => false;
+            public Action Pending;
+            public bool TryPost(Action action) { Pending = action; return true; }
+        }
+
+        [Test]
+        public void AdapterPreservesAffinityAndPostsThroughSharedDispatcher()
+        {
+            var original = ShrinkEventBusRuntime.MainThreadDispatcher;
+            try
+            {
+                var dispatcher = new Dispatcher();
+                var adapter = new ShrinkSharedMainThreadDispatcher(dispatcher);
+                ShrinkEventBusRuntime.ConfigureMainThreadDispatcher(adapter);
+                Assert.IsFalse(ShrinkEventBusRuntime.MainThreadDispatcher.IsMainThread);
+                var hits = 0;
+                Assert.IsTrue(ShrinkEventBusRuntime.MainThreadDispatcher.TryPost(() => hits++));
+                Assert.AreEqual(0, hits);
+                dispatcher.Pending();
+                Assert.AreEqual(1, hits);
+            }
+            finally { ShrinkEventBusRuntime.ConfigureMainThreadDispatcher(original); }
+        }
+
+        [Test]
+        public void AdapterRejectsNullDispatcher()
+        {
+            Assert.Throws<ArgumentNullException>(() => new ShrinkSharedMainThreadDispatcher(null));
+        }
+    }
+}
+#endif

Integration/Tests/SharedDispatcherTests.cs.meta

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+guid: 87e04bff7dc943dd9a8205b37e631c19

Integration/Tests/ShrinkEventBus.Integration.Runtime.Tests.asmdef

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+{
+  "name": "ShrinkEventBus.Integration.Runtime.Tests",
+  "references": [
+    "ShrinkEventBus.Runtime",
+    "ShrinkEventBus.Integration.Runtime",
+    "ShrinkRuntime.Abstractions"
+  ],
+  "includePlatforms": [
+    "Editor"
+  ],
+  "optionalUnityReferences": [
+    "TestAssemblies"
+  ],
+  "autoReferenced": false,
+  "defineConstraints": [
+    "UNITY_INCLUDE_TESTS",
+    "SHRINK_EVENTBUS_HAS_SHARED_RUNTIME"
+  ],
+  "versionDefines": [
+    {
+      "name": "com.cneicy.shrink-runtime-abstractions",
+      "expression": "0.1.0",
+      "define": "SHRINK_EVENTBUS_HAS_SHARED_RUNTIME"
+    }
+  ]
+}

Integration/Tests/ShrinkEventBus.Integration.Runtime.Tests.asmdef.meta

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