feat(etl): add result models for pipeline execution

NEW/src/JdeScoping.DataSync/Etl/Results/DestinationResult.cs

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+namespace JdeScoping.DataSync.Etl.Results;
+
+/// <summary>
+/// Represents the result of writing data to a destination.
+/// </summary>
+/// <param name="RowsProcessed">The number of rows successfully written to the destination.</param>
+/// <param name="BatchCount">The number of batches used to write the data.</param>
+/// <param name="Elapsed">The total time taken to write all batches.</param>
+public record DestinationResult(
+    long RowsProcessed,
+    int BatchCount,
+    TimeSpan Elapsed);

NEW/src/JdeScoping.DataSync/Etl/Results/PipelineResult.cs

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+namespace JdeScoping.DataSync.Etl.Results;
+
+/// <summary>
+/// Represents the complete result of an ETL pipeline execution.
+/// </summary>
+/// <param name="Success">Indicates whether the pipeline completed successfully.</param>
+/// <param name="TotalRows">The total number of rows processed by the pipeline.</param>
+/// <param name="Elapsed">The total time taken to execute the pipeline.</param>
+/// <param name="Steps">The results of each step executed in the pipeline.</param>
+/// <param name="Error">The exception that caused the pipeline to fail, if any.</param>
+public record PipelineResult(
+    bool Success,
+    long TotalRows,
+    TimeSpan Elapsed,
+    IReadOnlyList<StepResult> Steps,
+    Exception? Error = null)
+{
+    /// <summary>
+    /// Creates a successful pipeline result.
+    /// </summary>
+    /// <param name="totalRows">The total number of rows processed.</param>
+    /// <param name="elapsed">The total execution time.</param>
+    /// <param name="steps">The results of each step.</param>
+    /// <returns>A PipelineResult indicating success.</returns>
+    public static PipelineResult Succeeded(long totalRows, TimeSpan elapsed, IReadOnlyList<StepResult> steps)
+        => new(true, totalRows, elapsed, steps);
+
+    /// <summary>
+    /// Creates a failed pipeline result.
+    /// </summary>
+    /// <param name="totalRows">The number of rows processed before failure.</param>
+    /// <param name="elapsed">The total execution time including failure.</param>
+    /// <param name="steps">The results of steps executed before failure.</param>
+    /// <param name="error">The exception that caused the failure.</param>
+    /// <returns>A PipelineResult indicating failure with error details.</returns>
+    public static PipelineResult Failed(long totalRows, TimeSpan elapsed, IReadOnlyList<StepResult> steps, Exception error)
+        => new(false, totalRows, elapsed, steps, error);
+}

NEW/src/JdeScoping.DataSync/Etl/Results/StepResult.cs

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+namespace JdeScoping.DataSync.Etl.Results;
+
+/// <summary>
+/// Represents the result of a single pipeline step execution.
+/// </summary>
+/// <param name="StepName">The name of the step that was executed.</param>
+/// <param name="StepType">The type of step (e.g., "Transform", "Load").</param>
+/// <param name="RowsAffected">The number of rows affected by this step.</param>
+/// <param name="Elapsed">The time taken to execute this step.</param>
+public record StepResult(
+    string StepName,
+    string StepType,
+    long RowsAffected,
+    TimeSpan Elapsed);