feat(Story-2): Add IR Operations for ReLU Family (Group 1)

src/Interfaces/IJitCompilable.cs

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+using AiDotNet.LinearAlgebra;
+
+namespace AiDotNet.Interfaces;
+
+/// <summary>
+/// Marker interface for IR operations that can be JIT-compiled.
+/// </summary>
+/// <remarks>
+/// <para>
+/// This interface represents operations in the Intermediate Representation (IR) layer
+/// that can be Just-In-Time compiled for optimized execution on different hardware backends.
+/// </para>
+/// <para>
+/// IR operations serve as a bridge between high-level neural network layers and
+/// low-level execution engines (CPU, GPU, TPU).
+/// </para>
+/// </remarks>
+public interface IROp
+{
+    // Marker interface - no methods required
+    // Implementations will define their own Forward/Backward signatures
+}