feat: preserve due operation provenance (AEG-V15-035)

Carries scheduledFor, catch-up policy, and maxCatchUp from the scheduler through the request model and transactional outbox. Evidence: targeted Release tests 5/5 passed; TRX SHA256 C1BF3EF274702305A29673D5B6A1C3A98D08B1716DA3CD8CB0EE710B5E6C12E6. Schedules remain disabled.

src/KArtSell.Modules.ModelOperations/Application/ModelOperationsContracts.cs

@@ -28,6 +28,9 @@ public sealed record ModelOperationRequest(
     string ScopeKey,
     string AutomationMode,
     string IdempotencyKey,
+    DateTimeOffset ScheduledFor,
+    string CatchUpPolicy,
+    int MaxCatchUp,
     ApprovedModelContext Context,
     string CorrelationId,
     DateTimeOffset RequestedAt);
@@ -82,6 +85,9 @@ public interface IModelOperationRequestService
         string scopeKey,
         string automationMode,
         string idempotencyKey,
+        DateTimeOffset scheduledFor,
+        string catchUpPolicy,
+        int maxCatchUp,
         string correlationId,
         CancellationToken cancellationToken);
 }