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/G0101/seed/if_park_fee.intf.abap

@@ -0,0 +1,23 @@
+INTERFACE {{p}}if_park_fee PUBLIC.
+  TYPES ty_amount TYPE p LENGTH 8 DECIMALS 2.
+  TYPES ty_reason TYPE c LENGTH 10.
+  TYPES:
+    BEGIN OF ty_result,
+      reason TYPE ty_reason,
+      fee    TYPE ty_amount,
+    END OF ty_result.
+  CONSTANTS:
+    BEGIN OF c_reason,
+      ok       TYPE ty_reason VALUE 'OK',
+      bad_time TYPE ty_reason VALUE 'BAD_TIME',
+      too_long TYPE ty_reason VALUE 'TOO_LONG',
+    END OF c_reason.
+  METHODS calculate
+    IMPORTING iv_entry_date  TYPE d
+              iv_entry_time  TYPE t
+              iv_exit_date   TYPE d
+              iv_exit_time   TYPE t
+              iv_lost_ticket TYPE abap_bool
+              iv_discount    TYPE abap_bool
+    RETURNING VALUE(rs_result) TYPE ty_result.
+ENDINTERFACE.