Fix coverage with several contract classes; table annotation and file path checks; clean task dir on write

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014aUaQeLnwbb1zTpN7kHeat

tasks_gen/eval/G0109/reference/i_manager.ddls.asddls

@@ -0,0 +1,11 @@
+@AccessControl.authorizationCheck: #NOT_REQUIRED
+@EndUserText.label: 'Manager'
+define view entity {{P}}I_MANAGER
+  as select from {{p}}emp
+{
+  key emp_id     as mgr_id,
+      emp_name   as mgr_name,
+      department as mgr_dept
+}
+where
+  is_manager = 'X'