Initial commit

srcs/RobotNet10/Commons/RobotNet10.Common/Models/KDTreeNode.cs

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+namespace RobotNet10.Common.Models;
+
+/// <summary>
+/// Represents a node in the KD-Tree structure.
+/// Immutable to prevent structural corruption.
+/// </summary>
+/// <remarks>
+/// Initializes a new KD-Tree node.
+/// </remarks>
+public class KDTreeNode(KDTreeData node, int axis, KDTreeNode? left = null, KDTreeNode? right = null)
+{
+    /// <summary>
+    /// The spatial node stored at this tree node.
+    /// </summary>
+    public KDTreeData Node { get; } = node ?? throw new ArgumentNullException(nameof(node));
+
+    /// <summary>
+    /// Left child (contains points with smaller values along the split axis).
+    /// </summary>
+    public KDTreeNode? Left { get; } = left;
+
+    /// <summary>
+    /// Right child (contains points with larger values along the split axis).
+    /// </summary>
+    public KDTreeNode? Right { get; } = right;
+
+    /// <summary>
+    /// The axis used for splitting: 0 for X, 1 for Y.
+    /// </summary>
+    public int Axis { get; } = axis;
+}
+
+public record KDTreeData(string Id, double X, double Y);