test(09-05): add failing tests for deterministic bulk delete

- Empty selections are 422 and duplicates run once in primary-key order
- A completed retry and an all-absent selection delete nothing and skip hooks
- Mixed, hook, cancel, and concurrent requests keep the batch atomic

cabana/crud.go

@@ -168,6 +168,12 @@ func (s CRUDService) Delete(ctx context.Context, cc *CompiledController, id any)
 	return result, nil
 }
 
+// BulkDelete removes a normalized id set in one transaction.
+// The deterministic lifecycle is added with the bulk route.
+func (s CRUDService) BulkDelete(ctx context.Context, cc *CompiledController, in BulkDeleteInput) (BulkResult, error) {
+	return BulkResult{}, errors.New("cabana: bulk delete is not implemented")
+}
+
 // Show loads one scoped record. Missing and out-of-scope ids are identical.
 func (s CRUDService) Show(ctx context.Context, cc *CompiledController, id any) (map[string]any, error) {
 	if s.DB == nil {