feat(datasync): add Schedules property to PipelineConfig

Add PipelineSchedules? Schedules parameter to PipelineConfig record between
SyncModes and Transformers for new schedule-based configuration. The existing
SyncModes property is now nullable for backward compatibility during the
transition to the new schedule system.

NEW/tests/JdeScoping.DataSync.Tests/Configuration/PipelinesRootTests.cs

@@ -67,6 +67,28 @@ public class PipelinesRootTests
         root.Pipelines["TestTable"].Destination.Table.ShouldBe("TestTable");
     }
 
+    [Fact]
+    public void PipelineConfig_WithSchedules_ParsesCorrectly()
+    {
+        var config = new PipelineConfig(
+            new SourceConfig("jde", "SELECT 1", null, null),
+            null, // Old SyncModes - deprecated
+            new PipelineSchedules
+            {
+                Mass = new ScheduleConfig { PrePurge = true, ReIndex = true },
+                Daily = new ScheduleConfig { Enabled = true },
+                Hourly = new ScheduleConfig { Enabled = false }
+            },
+            null,
+            new DestinationConfig("TestTable", ["Id"], null),
+            null,
+            null);
+
+        config.Schedules.ShouldNotBeNull();
+        config.Schedules!.Mass!.PrePurge.ShouldBeTrue();
+        config.Schedules!.Hourly!.Enabled.ShouldBeFalse();
+    }
+
     private static PipelineConfig CreateMinimalPipelineConfig()
     {
         return new PipelineConfig(
@@ -76,7 +98,8 @@ public class PipelinesRootTests
                 ["mass"] = new SyncModeConfig(null, true, true),
                 ["incremental"] = new SyncModeConfig("-1d")
             },
-            null,
+            null, // Schedules
+            null, // Transformers
             new DestinationConfig("TestTable", ["Id"], null),
             null,
             null);