Arrange code structure. Introduce dynamic scheduler and multi leader.

StgSharp.Device/ICommandBuilder.cs

@@ -0,0 +1,30 @@
+namespace EM.LowLevel
+{
+    /// <summary>
+    ///   Builds device/peripheral commands from C#-friendly types (enums, records, structs, etc.).
+    /// </summary>
+    public interface ICommandBuilder
+    {
+
+        /// <summary>
+        ///   Build a command payload (already framed or raw depending on implementation contract) from a
+        ///   strongly-typed command description.
+        /// </summary>
+        /// <typeparam name="TCommand">
+        ///   Command type (e.g., an enum or a record/struct)
+        /// </typeparam>
+        /// <param name="command">
+        ///   Command value to build
+        /// </param>
+        /// <returns>
+        ///   Command bytes
+        /// </returns>
+        ReadOnlyMemory<byte> Build<TCommand>(TCommand command) where TCommand: notnull;
+
+        /// <summary>
+        ///   Try-build variant to avoid throwing and allow buffer reuse strategies.
+        /// </summary>
+        bool TryBuild<TCommand>(TCommand command, out ReadOnlyMemory<byte> bytes) where TCommand: notnull;
+
+    }
+}