Initial commit

srcs/RobotNet10/RobotApp/Communication/CeresSharp/Enums/NumericDiffMethod.cs

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+namespace CeresSharp.Enums;
+
+/// <summary>
+/// Numeric differentiation methods for NumericDiffCostFunction.
+/// Values must match ceres_numeric_diff_method_t enum in ceres_wrapper.h.
+/// Note: The wrapper defines its own enum order (Forward=0, Central=1) which differs
+/// from ceres::NumericDiffMethodType (Central=0, Forward=1). The wrapper uses a switch
+/// statement to map correctly, so C# must match the wrapper's enum.
+/// </summary>
+public enum NumericDiffMethod
+{
+    /// <summary>
+    /// Compute forward finite difference: f'(x) ~ (f(x+h) - f(x)) / h.
+    /// </summary>
+    Forward = 0,
+
+    /// <summary>
+    /// Compute central finite difference: f'(x) ~ (f(x+h) - f(x-h)) / 2h.
+    /// </summary>
+    Central = 1,
+
+    /// <summary>
+    /// Adaptive numerical differentiation using Ridders' method.
+    /// </summary>
+    Ridders = 2
+}