Harness: runner, generator, tasks T01 T13 T14 T15, CLAUDE.md

tasks/T01/seed/if_iban_check.intf.abap

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+INTERFACE {{p}}if_iban_check PUBLIC.
+  TYPES ty_reason TYPE c LENGTH 10.
+  CONSTANTS:
+    BEGIN OF c_reason,
+      ok       TYPE ty_reason VALUE 'OK',
+      empty    TYPE ty_reason VALUE 'EMPTY',
+      chars    TYPE ty_reason VALUE 'CHARS',
+      country  TYPE ty_reason VALUE 'COUNTRY',
+      length   TYPE ty_reason VALUE 'LENGTH',
+      checksum TYPE ty_reason VALUE 'CHECKSUM',
+    END OF c_reason.
+  METHODS check
+    IMPORTING iv_iban          TYPE string
+    RETURNING VALUE(rv_reason) TYPE ty_reason.
+ENDINTERFACE.