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/JdeScoping.Core/Models/SearchResults/MisNonMatchSearchResult.cs

@@ -5,16 +5,28 @@ namespace JdeScoping.Core.Models.SearchResults;
 /// </summary>
 public sealed class MisNonMatchSearchResult
 {
+    /// <summary>The work center code.</summary>
     public string WorkCenterCode { get; init; } = string.Empty;
+    /// <summary>The work order number.</summary>
     public long WorkOrderNumber { get; init; }
+    /// <summary>The work order start date.</summary>
     public DateTime WorkOrderStartDate { get; init; }
+    /// <summary>The job step number.</summary>
     public decimal JobStepNumber { get; init; }
+    /// <summary>The job step description.</summary>
     public string JobStepDescription { get; init; } = string.Empty;
+    /// <summary>The job step end date.</summary>
     public DateTime? JobStepEndDate { get; init; }
+    /// <summary>The function code.</summary>
     public string FunctionCode { get; init; } = string.Empty;
+    /// <summary>Indicates whether the job step was added.</summary>
     public bool WasJobStepAdded { get; init; }
+    /// <summary>The matched job step number, if any.</summary>
     public decimal? MatchedJobStepNumber { get; init; }
+    /// <summary>The item number.</summary>
     public string ItemNumber { get; init; } = string.Empty;
+    /// <summary>The item description.</summary>
     public string ItemDescription { get; init; } = string.Empty;
+    /// <summary>The routing type.</summary>
     public string RoutingType { get; init; } = string.Empty;
 }

NEW/src/JdeScoping.Core/Models/SearchResults/MisSearchResult.cs

@@ -5,23 +5,42 @@ namespace JdeScoping.Core.Models.SearchResults;
 /// </summary>
 public sealed class MisSearchResult
 {
+    /// <summary>The item number.</summary>
     public string ItemNumber { get; init; } = string.Empty;
+    /// <summary>The item description.</summary>
     public string ItemDescription { get; init; } = string.Empty;
+    /// <summary>The sequence number.</summary>
     public string SequenceNumber { get; init; } = string.Empty;
+    /// <summary>The MIS (Manufacturing Instruction Sheet) number.</summary>
     public string MisNumber { get; init; } = string.Empty;
+    /// <summary>The revision ID.</summary>
     public string RevId { get; init; } = string.Empty;
+    /// <summary>The status.</summary>
     public string Status { get; init; } = string.Empty;
+    /// <summary>The release date.</summary>
     public DateTime? ReleaseDate { get; init; }
+    /// <summary>The branch code.</summary>
     public string BranchCode { get; init; } = string.Empty;
+    /// <summary>The job step sequence number.</summary>
     public decimal JobStepSequenceNumber { get; init; }
+    /// <summary>The matched sequence number.</summary>
     public decimal? MatchedSequenceNumber { get; init; }
+    /// <summary>Whether the routing matches.</summary>
     public bool RoutingMatch { get; init; }
+    /// <summary>Whether the master matches.</summary>
     public bool MasterMatch { get; init; }
+    /// <summary>The function operation description.</summary>
     public string FunctionOperationDescription { get; init; } = string.Empty;
+    /// <summary>The character number.</summary>
     public string CharNumber { get; init; } = string.Empty;
+    /// <summary>The test description.</summary>
     public string TestDescription { get; init; } = string.Empty;
+    /// <summary>The sampling type.</summary>
     public string SamplingType { get; init; } = string.Empty;
+    /// <summary>The sampling value.</summary>
     public string SamplingValue { get; init; } = string.Empty;
+    /// <summary>The tools and gauges required.</summary>
     public string ToolsGauges { get; init; } = string.Empty;
+    /// <summary>The work instructions.</summary>
     public string WorkInstructions { get; init; } = string.Empty;
 }

NEW/src/JdeScoping.Core/Models/SearchResults/SearchModel.cs

@@ -5,15 +5,25 @@ namespace JdeScoping.Core.Models.SearchResults;
 /// </summary>
 public class SearchModel
 {
+    /// <summary>The unique identifier for the search.</summary>
     public int Id { get; set; }
+    /// <summary>The username of the user who submitted the search.</summary>
     public string UserName { get; set; } = string.Empty;
+    /// <summary>The name of the search.</summary>
     public string Name { get; set; } = string.Empty;
+    /// <summary>The date and time the search was submitted.</summary>
     public DateTime? SubmitDt { get; set; }
+    /// <summary>The date and time when search execution started.</summary>
     public DateTime? StartDt { get; set; }
+    /// <summary>The date and time when search execution ended.</summary>
     public DateTime? EndDt { get; set; }
+    /// <summary>Indicates whether MIS data extraction is enabled for this search.</summary>
     public bool ExtractMisData { get; set; }
 
+    /// <summary>The main search results.</summary>
     public List<SearchResult> Results { get; set; } = [];
+    /// <summary>The MIS-specific search results.</summary>
     public List<MisSearchResult> MisResults { get; set; } = [];
+    /// <summary>The MIS non-match investigation results.</summary>
     public List<MisNonMatchSearchResult> MisNonMatchResults { get; set; } = [];
 }

NEW/src/JdeScoping.Core/Models/SearchResults/SearchResult.cs

@@ -5,30 +5,119 @@ namespace JdeScoping.Core.Models.SearchResults;
 /// </summary>
 public sealed class SearchResult
 {
+    /// <summary>
+    /// Work order number.
+    /// </summary>
     public long WorkOrderNumber { get; init; }
+
+    /// <summary>
+    /// Branch code for the work order.
+    /// </summary>
     public string WorkOrderBranchCode { get; init; } = string.Empty;
+
+    /// <summary>
+    /// Lot number.
+    /// </summary>
     public string LotNumber { get; init; } = string.Empty;
+
+    /// <summary>
+    /// Item number.
+    /// </summary>
     public string ItemNumber { get; init; } = string.Empty;
+
+    /// <summary>
+    /// Planning family.
+    /// </summary>
     public string PlanningFamily { get; init; } = string.Empty;
+
+    /// <summary>
+    /// Stocking type.
+    /// </summary>
     public string StockingType { get; init; } = string.Empty;
+
+    /// <summary>
+    /// Order quantity.
+    /// </summary>
     public decimal OrderQuantity { get; init; }
+
+    /// <summary>
+    /// Held quantity.
+    /// </summary>
     public decimal HeldQuantity { get; init; }
+
+    /// <summary>
+    /// Scrapped quantity.
+    /// </summary>
     public decimal ScrappedQuantity { get; init; }
+
+    /// <summary>
+    /// Shipped quantity.
+    /// </summary>
     public decimal ShippedQuantity { get; init; }
+
+    /// <summary>
+    /// Branch code for the step.
+    /// </summary>
     public string StepBranchCode { get; init; } = string.Empty;
+
+    /// <summary>
+    /// Step number.
+    /// </summary>
     public decimal StepNumber { get; init; }
+
+    /// <summary>
+    /// Description of the step.
+    /// </summary>
     public string StepDescription { get; init; } = string.Empty;
+
+    /// <summary>
+    /// Function operation description.
+    /// </summary>
     public string FunctionOperationDescription { get; init; } = string.Empty;
+
+    /// <summary>
+    /// Step update date and time.
+    /// </summary>
     public DateTime StepUpdateDt { get; init; }
+
+    /// <summary>
+    /// Status code.
+    /// </summary>
     public string StatusCode { get; init; } = string.Empty;
+
+    /// <summary>
+    /// Status description.
+    /// </summary>
     public string StatusDescription { get; init; } = string.Empty;
+
+    /// <summary>
+    /// Status update date and time.
+    /// </summary>
     public DateTime? StatusUpdateDt { get; init; }
 
-    // Inclusion flags
+    /// <summary>
+    /// Indicates if manually specified in search criteria.
+    /// </summary>
     public bool ManuallySpecified { get; init; }
+
+    /// <summary>
+    /// Indicates if part of a split order.
+    /// </summary>
     public bool SplitOrder { get; init; }
+
+    /// <summary>
+    /// Indicates if flagged for cardex inclusion.
+    /// </summary>
     public bool Cardex { get; init; }
+
+    /// <summary>
+    /// Indicates if included via parts list.
+    /// </summary>
     public bool PartsList { get; init; }
+
+    /// <summary>
+    /// Indicates if flagged for inclusion.
+    /// </summary>
     public bool Flagged { get; init; }
 
     /// <summary>