docs: add XML documentation and ConfigManager implementation plans

Add comprehensive XML documentation (param/returns tags) across 132 source
files to improve IntelliSense and API discoverability. Include ConfigManager
design documents and implementation plans for phases 1-9.

NEW/src/Utils/JdeScoping.ConfigManager/Models/ScheduleModel.cs

@@ -5,8 +5,23 @@ namespace JdeScoping.ConfigManager.Models;
 /// </summary>
 public class ScheduleModel
 {
+    /// <summary>
+    /// Gets or sets a value indicating whether the scheduled task is enabled.
+    /// </summary>
     public bool Enabled { get; set; } = true;
+
+    /// <summary>
+    /// Gets or sets the interval in minutes between scheduled task executions.
+    /// </summary>
     public int IntervalMinutes { get; set; } = 60;
+
+    /// <summary>
+    /// Gets or sets a value indicating whether to purge data before task execution.
+    /// </summary>
     public bool PrePurge { get; set; } = false;
+
+    /// <summary>
+    /// Gets or sets a value indicating whether to reindex after task execution.
+    /// </summary>
     public bool ReIndex { get; set; } = false;
 }