H and K tested (G0168, G0178 accepted); keyword fast path needs all groups

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

tasks_gen/eval/G0168/seed/if_discount.intf.abap

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+INTERFACE {{p}}if_discount PUBLIC.
+  TYPES ty_group TYPE c LENGTH 1.
+  TYPES ty_percent TYPE p LENGTH 5 DECIMALS 2.
+  CONSTANTS:
+    c_group_key      TYPE ty_group VALUE 'A',
+    c_group_standard TYPE ty_group VALUE 'S'.
+  METHODS calculate
+    IMPORTING iv_quantity       TYPE i
+              iv_group          TYPE ty_group
+    RETURNING VALUE(rv_percent) TYPE ty_percent.
+ENDINTERFACE.