Update Project

Assets/Scripts/Gameplay/Pipes/IPipePool.cs

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+namespace FlappyBird.Gameplay.Pipes
+{
+    /// <summary>
+    /// Contract for the pipe-pair pool service.
+    /// </summary>
+    public interface IPipePool
+    {
+        /// <summary>
+        /// Pre-warms the pool. Must be called after the container is fully built
+        /// (i.e. from IInitializable.Initialize) to avoid circular dependency.
+        /// </summary>
+        void Initialize();
+
+        /// <summary>Returns a PipeView from the pool, expanding it if necessary.</summary>
+        PipeView Get();
+
+        /// <summary>Returns a PipeView back to the pool.</summary>
+        void Return(PipeView pipe);
+    }
+}