Initial commit: JDE Scoping Tool migration project

Set up repository with legacy .NET Framework 4.8 source (OLD/),
new .NET 10 Blazor solution (NEW/), OpenSpec specifications,
documentation, and project configuration.

NEW/src/JdeScoping.DataAccess/Attributes/OutputColumnAttribute.cs

@@ -0,0 +1,58 @@
+namespace JdeScoping.DataAccess.Attributes;
+
+/// <summary>
+/// Excel output column specification attribute.
+/// </summary>
+[AttributeUsage(AttributeTargets.Property)]
+public class OutputColumnAttribute : Attribute
+{
+    /// <summary>
+    /// Standard format.
+    /// </summary>
+    public const string StdFormat = "@";
+
+    /// <summary>
+    /// Standard date format.
+    /// </summary>
+    public const string DateFormat = "[$-409]MM/dd/yyyy;@";
+
+    /// <summary>
+    /// Standard timestamp format.
+    /// </summary>
+    public const string TimestampFormat = "[$-409]m/d/yy h:mm AM/PM;@";
+
+    /// <summary>
+    /// Wrapped text column default width.
+    /// </summary>
+    public const double WrappedColumnWidth = 65;
+
+    /// <summary>
+    /// Order to display column.
+    /// </summary>
+    public int Order { get; set; }
+
+    /// <summary>
+    /// Override text to display for column header.
+    /// </summary>
+    public string HeaderText { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Column format (Excel formatting string).
+    /// </summary>
+    public string Format { get; set; } = StdFormat;
+
+    /// <summary>
+    /// Whether or not width should be set automatically.
+    /// </summary>
+    public bool AutoWidth { get; set; } = true;
+
+    /// <summary>
+    /// Manually set width (only used if AutoWidth = FALSE).
+    /// </summary>
+    public double Width { get; set; }
+
+    /// <summary>
+    /// Whether or not text should be wrapped.
+    /// </summary>
+    public bool WrapText { get; set; }
+}

NEW/src/JdeScoping.DataAccess/Attributes/OutputTableAttribute.cs

@@ -0,0 +1,23 @@
+namespace JdeScoping.DataAccess.Attributes;
+
+/// <summary>
+/// Excel output table specification attribute.
+/// </summary>
+[AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct)]
+public class OutputTableAttribute : Attribute
+{
+    /// <summary>
+    /// Output tab name in Excel.
+    /// </summary>
+    public string TabName { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Table name for the Excel table.
+    /// </summary>
+    public string TableName { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Whether or not merged header should be shown.
+    /// </summary>
+    public bool ShowHeader { get; set; }
+}