Этап 2

Minint.Core/Services/IMinintSerializer.cs

@@ -0,0 +1,17 @@
+using Minint.Core.Models;
+
+namespace Minint.Core.Services;
+
+public interface IMinintSerializer
+{
+    /// <summary>
+    /// Serializes the container to a binary .minint stream.
+    /// </summary>
+    void Write(Stream stream, MinintContainer container);
+
+    /// <summary>
+    /// Deserializes a .minint stream into a container.
+    /// Throws <see cref="InvalidDataException"/> on format/validation errors.
+    /// </summary>
+    MinintContainer Read(Stream stream);
+}