feat(tasks): implement atomic claims and leases

backend-api/internal/repository/sqlite/store_test.go

@@ -190,7 +190,7 @@ func TestStoreAssetAndTaskLifecycleIsTransactionalAndIdempotent(
 		t.Fatalf("detail = %+v", detail)
 	}
 
-	canceled, err := store.CancelPendingTask(
+	canceled, err := store.CancelTask(
 		ctx,
 		"local-admin",
 		task.ID,
@@ -199,7 +199,7 @@ func TestStoreAssetAndTaskLifecycleIsTransactionalAndIdempotent(
 		testEvent(3, task.ID, "TASK_CANCELED", now.Add(time.Minute)),
 	)
 	if err != nil {
-		t.Fatalf("CancelPendingTask() error = %v", err)
+		t.Fatalf("CancelTask() error = %v", err)
 	}
 	if canceled.Status != domain.TaskStatusCanceled ||
 		canceled.Version != 2 ||
@@ -207,7 +207,7 @@ func TestStoreAssetAndTaskLifecycleIsTransactionalAndIdempotent(
 		*canceled.CancelReason != "no longer needed" {
 		t.Fatalf("canceled task = %+v", canceled)
 	}
-	_, err = store.CancelPendingTask(
+	_, err = store.CancelTask(
 		ctx,
 		"local-admin",
 		task.ID,