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

JobTrackerApi.Tests/JobApplicationsEndpointBehaviorTests.cs

@@ -28,7 +28,7 @@ public sealed class JobApplicationsEndpointBehaviorTests
         await db.SaveChangesAsync();
 
         var controller = CreateController(db, "user-1");
-        var result = await controller.SaveApplicationDrafts(job.Id, new SaveApplicationDraftsRequest(" Cover letter body ", " Notes body ", null), CancellationToken.None);
+        var result = await controller.SaveApplicationDrafts(job.Id, new SaveApplicationDraftsRequest(" Cover letter body ", " Notes body ", null, ExpectedVersion: job.Version), CancellationToken.None);
 
         Assert.IsType<NoContentResult>(result);
         var saved = await db.JobApplications.FirstAsync();
@@ -272,7 +272,8 @@ public sealed class JobApplicationsEndpointBehaviorTests
             JobUrl: null,
             DateApplied: null,
             FeedbackRequestedAt: null,
-            StatusChangedAt: null);
+            StatusChangedAt: null,
+            ExpectedVersion: job.Version);
 
         var result = await controller.Update(job.Id, request, CancellationToken.None);
 
@@ -340,7 +341,8 @@ public sealed class JobApplicationsEndpointBehaviorTests
             JobUrl: null,
             DateApplied: null,
             FeedbackRequestedAt: null,
-            StatusChangedAt: null);
+            StatusChangedAt: null,
+            ExpectedVersion: job.Version);
 
         Assert.IsType<NoContentResult>(await controller.Update(job.Id, request, CancellationToken.None));
 
@@ -348,7 +350,7 @@ public sealed class JobApplicationsEndpointBehaviorTests
         summarizer.Verify(service => service.SummarizeAsync(It.IsAny<string>(), 160, 60), Times.Once);
         Assert.Contains(await db.JobEvents.ToListAsync(), item => item.Type == "AiRefreshed" && item.Note!.Contains("automatically"));
 
-        request = request with { Description = request.Description + "  " };
+        request = request with { Description = request.Description + "  ", ExpectedVersion = job.Version };
         Assert.IsType<NoContentResult>(await controller.Update(job.Id, request, CancellationToken.None));
         summarizer.Verify(service => service.SummarizeAsync(It.IsAny<string>(), 160, 60), Times.Once);
     }