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.DataSync/Models/ColumnSchema.cs

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+namespace JdeScoping.DataSync.Models;
+
+/// <summary>
+/// Represents the schema of a database column.
+/// </summary>
+/// <param name="Name">Column name.</param>
+/// <param name="DataType">SQL Server data type name (e.g., "nvarchar", "int", "decimal").</param>
+/// <param name="MaxLength">Maximum length for string columns (-1 for MAX).</param>
+/// <param name="Precision">Precision for decimal columns.</param>
+/// <param name="Scale">Scale for decimal columns.</param>
+/// <param name="IsNullable">Whether the column allows null values.</param>
+/// <param name="OrdinalPosition">Column ordinal position (1-based).</param>
+public record ColumnSchema(
+    string Name,
+    string DataType,
+    int? MaxLength,
+    int? Precision,
+    int? Scale,
+    bool IsNullable,
+    int OrdinalPosition);

NEW/src/JdeScoping.DataSync/Models/DataUpdateTask.cs

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+using JdeScoping.Core.Models.Enums;
+using JdeScoping.DataSync.Configuration;
+
+namespace JdeScoping.DataSync.Models;
+
+/// <summary>
+/// Represents a pending data update task to be executed.
+/// </summary>
+public class DataUpdateTask
+{
+    /// <summary>
+    /// Unique identifier for this operation (used for staging table suffixes).
+    /// </summary>
+    public Guid OperationId { get; init; } = Guid.NewGuid();
+
+    /// <summary>
+    /// Target table name in SQL Server cache.
+    /// </summary>
+    public required string TableName { get; init; }
+
+    /// <summary>
+    /// Source system: "JDE" or "CMS".
+    /// </summary>
+    public required string SourceSystem { get; init; }
+
+    /// <summary>
+    /// Source data identifier.
+    /// </summary>
+    public string SourceData { get; init; } = string.Empty;
+
+    /// <summary>
+    /// Type of update (Hourly, Daily, Mass).
+    /// </summary>
+    public UpdateTypes UpdateType { get; init; }
+
+    /// <summary>
+    /// For incremental updates, the minimum datetime to fetch records from.
+    /// Null for mass updates (full refresh).
+    /// </summary>
+    public DateTime? MinimumDt { get; init; }
+
+    /// <summary>
+    /// The data source configuration for this task.
+    /// </summary>
+    public required DataSourceConfig Config { get; init; }
+
+    /// <summary>
+    /// Gets a unique key for logging purposes.
+    /// </summary>
+    public string LogKey => $"{TableName}_{UpdateType}_{OperationId:N}";
+
+    /// <summary>
+    /// Gets the schedule configuration for this update type.
+    /// </summary>
+    public ScheduleConfig ScheduleConfig => UpdateType switch
+    {
+        UpdateTypes.Mass => Config.MassConfig,
+        UpdateTypes.Daily => Config.DailyConfig,
+        UpdateTypes.Hourly => Config.HourlyConfig,
+        _ => throw new ArgumentOutOfRangeException(nameof(UpdateType))
+    };
+}

NEW/src/JdeScoping.DataSync/Models/MergeResult.cs

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+namespace JdeScoping.DataSync.Models;
+
+/// <summary>
+/// Result of a bulk merge operation.
+/// </summary>
+/// <param name="TotalRowsProcessed">Total number of rows processed from source.</param>
+/// <param name="RowsInserted">Number of rows inserted (new records).</param>
+/// <param name="RowsUpdated">Number of rows updated (existing records).</param>
+/// <param name="BatchCount">Number of batches processed.</param>
+/// <param name="Elapsed">Total elapsed time for the operation.</param>
+public record MergeResult(
+    int TotalRowsProcessed,
+    int RowsInserted,
+    int RowsUpdated,
+    int BatchCount,
+    TimeSpan Elapsed)
+{
+    /// <summary>
+    /// Total rows affected (inserted + updated).
+    /// </summary>
+    public int TotalRowsAffected => RowsInserted + RowsUpdated;
+}
+
+/// <summary>
+/// Result of a mass insert operation.
+/// </summary>
+/// <param name="TotalRowsInserted">Total rows inserted.</param>
+/// <param name="Elapsed">Total elapsed time.</param>
+/// <param name="IndexesRebuilt">Whether indexes were rebuilt (vs just re-enabled).</param>
+public record MassInsertResult(
+    long TotalRowsInserted,
+    TimeSpan Elapsed,
+    bool IndexesRebuilt);