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/G0018/reference/i_customer.ddls.asddls

@@ -1,9 +0,0 @@
-@AccessControl.authorizationCheck: #NOT_REQUIRED
-@EndUserText.label: 'Customer master'
-define view entity {{P}}I_CUSTOMER
-  as select from {{p}}cust
-{
-  key cust_id,
-      cust_name,
-      country
-}