feat: add Godot C# compatibility and shared codegen weaving

Assets/Modules/ShrinkRuntime.Abstractions/Runtime.meta

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Assets/Modules/ShrinkRuntime.Abstractions/Runtime/ShrinkRuntime.Abstractions.asmdef

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+{
+  "name": "ShrinkRuntime.Abstractions",
+  "rootNamespace": "ShrinkSDK.Runtime",
+  "autoReferenced": true
+}

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Assets/Modules/ShrinkRuntime.Abstractions/Runtime/ShrinkRuntimeServices.cs

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+#nullable enable
+
+using System;
+using System.Diagnostics;
+using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace ShrinkSDK.Runtime
+{
+    public enum ShrinkLogLevel { Trace, Debug, Information, Warning, Error }
+
+    public interface IShrinkLogger
+    {
+        void Log(ShrinkLogLevel level, string message, Exception? exception = null);
+    }
+
+    public interface IShrinkMainThreadDispatcher
+    {
+        bool IsMainThread { get; }
+        bool TryPost(Action action);
+    }
+
+    public interface IShrinkClock
+    {
+        DateTimeOffset UtcNow { get; }
+        double UnscaledTimeSeconds { get; }
+    }
+
+    public interface IShrinkPathProvider
+    {
+        string PersistentDataPath { get; }
+        string TemporaryDataPath { get; }
+    }
+
+    public interface IShrinkScreenshotProvider
+    {
+        ValueTask<byte[]> CapturePngAsync(CancellationToken cancellationToken = default);
+    }
+
+    public interface IShrinkApplicationLifecycle
+    {
+        event Action? Paused;
+        event Action? Resumed;
+        event Action? Exiting;
+    }
+
+    public static class ShrinkLoggerExtensions
+    {
+        public static void Error(this IShrinkLogger logger, string message, Exception? exception = null) =>
+            logger.Log(ShrinkLogLevel.Error, message, exception);
+    }
+
+    public static class ShrinkRuntimeServices
+    {
+        private static IShrinkLogger _logger = new ConsoleLogger();
+        private static IShrinkMainThreadDispatcher _dispatcher = new InlineDispatcher();
+        private static IShrinkClock _clock = new SystemClock();
+        private static IShrinkPathProvider _paths = new SystemPaths();
+
+        public static IShrinkLogger Logger => _logger;
+        public static IShrinkMainThreadDispatcher Dispatcher => _dispatcher;
+        public static IShrinkClock Clock => _clock;
+        public static IShrinkPathProvider Paths => _paths;
+        public static IShrinkScreenshotProvider? Screenshots { get; private set; }
+        public static IShrinkApplicationLifecycle? Lifecycle { get; private set; }
+
+        public static void Configure(IShrinkLogger logger, IShrinkMainThreadDispatcher dispatcher,
+            IShrinkClock clock, IShrinkPathProvider paths,
+            IShrinkScreenshotProvider? screenshots = null, IShrinkApplicationLifecycle? lifecycle = null)
+        {
+            _logger = logger ?? throw new ArgumentNullException(nameof(logger));
+            _dispatcher = dispatcher ?? throw new ArgumentNullException(nameof(dispatcher));
+            _clock = clock ?? throw new ArgumentNullException(nameof(clock));
+            _paths = paths ?? throw new ArgumentNullException(nameof(paths));
+            Screenshots = screenshots;
+            Lifecycle = lifecycle;
+        }
+
+        private sealed class ConsoleLogger : IShrinkLogger
+        {
+            public void Log(ShrinkLogLevel level, string message, Exception? exception = null)
+            {
+                Console.WriteLine($"[{level}] {message}");
+                if (exception != null) Console.WriteLine(exception);
+            }
+        }
+
+        private sealed class InlineDispatcher : IShrinkMainThreadDispatcher
+        {
+            public bool IsMainThread => true;
+            public bool TryPost(Action action)
+            {
+                if (action == null) return false;
+                action();
+                return true;
+            }
+        }
+
+        private sealed class SystemClock : IShrinkClock
+        {
+            private readonly Stopwatch _stopwatch = Stopwatch.StartNew();
+            public DateTimeOffset UtcNow => DateTimeOffset.UtcNow;
+            public double UnscaledTimeSeconds => _stopwatch.Elapsed.TotalSeconds;
+        }
+
+        private sealed class SystemPaths : IShrinkPathProvider
+        {
+            public string PersistentDataPath => Path.Combine(
+                Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "ShrinkSDK");
+            public string TemporaryDataPath => Path.GetTempPath();
+        }
+    }
+
+    [AttributeUsage(AttributeTargets.Assembly, AllowMultiple = false)]
+    public sealed class ShrinkCodeGenWovenAttribute : Attribute
+    {
+        public ShrinkCodeGenWovenAttribute(string weaverVersion, string inputMvid)
+        {
+            WeaverVersion = weaverVersion;
+            InputMvid = inputMvid;
+        }
+
+        public string WeaverVersion { get; }
+        public string InputMvid { get; }
+    }
+}

Assets/Modules/ShrinkRuntime.Abstractions/Runtime/ShrinkRuntimeServices.cs.meta

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Assets/Modules/ShrinkRuntime.Abstractions/package.json

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+{
+  "name": "com.cneicy.shrink-runtime-abstractions",
+  "version": "0.1.0",
+  "displayName": "ShrinkSDK Runtime Abstractions",
+  "description": "Engine-neutral runtime services and CodeGen marker contracts.",
+  "unity": "2022.3"
+}

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