fix(rd21): guard career and job saves with durable revisions

JobTrackerApi/Services/ApplicationWorkspaceService.cs

@@ -47,7 +47,8 @@ public sealed record WorkspaceOverviewDto(
     DateTimeOffset? LastAiAtUtc,
     IReadOnlyList<WorkspaceActivityDto> RecentActivity,
     WorkspaceNextStepDto? NextStep,
-    ChecklistProgressDto? ChecklistProgress);
+    ChecklistProgressDto? ChecklistProgress,
+    int Revision = 1);
 
 public interface IApplicationWorkspaceService
 {
@@ -147,7 +148,8 @@ public sealed class ApplicationWorkspaceService : IApplicationWorkspaceService
             lastAi,
             activity,
             NextStep(checklist),
-            checklist?.Progress);
+            checklist?.Progress,
+            job.Version);
     }
 
     // "The user should never ask what to do next." Milestone 2 moved this onto the checklist: the first