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/spec.md

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+# 1. Goal
+Calculate the discount percentage for a wholesale order. A sales program calls the
+calculation before it prices the order. The program needs one discount percentage
+for each order.
+
+# 2. Open questions
+None.
+
+# 3. Context
+- The interface {{P}}IF_DISCOUNT exists in package $TMP. It is active.
+- The interface has the type TY_GROUP (CHAR 1), the type TY_PERCENT (P length 5
+  with 2 decimals), the constants C_GROUP_KEY ('A') and C_GROUP_STANDARD ('S'),
+  and one method:
+  CALCULATE IMPORTING iv_quantity TYPE i
+                    iv_group    TYPE ty_group
+            RETURNING VALUE(rv_percent) TYPE ty_percent.
+
+# 4. Contract
+- Create the class {{P}}VOLUME_DISCOUNT in package $TMP.
+- The class is public, final, and has a public constructor without parameters.
+- The class implements {{P}}IF_DISCOUNT.
+- Do not add other public methods.
+
+# 5. Business rules
+The discount percentage is the sum of the customer discount and the volume
+discount. The result is at most 12.00.
+1. Customer discount:
+   - Group C_GROUP_KEY: 6.00.
+   - Group C_GROUP_STANDARD: 0.00.
+   - Any other group: 0.00.
+2. Volume discount. The order quantity is the number of pieces:
+   - Less than 100 pieces: 0.00.
+   - More than 100 pieces and less than 500 pieces: 3.00.
+   - 500 pieces or more: 7.00.
+3. Add the customer discount and the volume discount. If the sum is more than
+   12.00, the result is 12.00.
+
+# 6. Constraints
+- Release target: 8.16.
+- Coding standards: Clean ABAP. Method length below 40 statements. No global
+  variables. No comment that restates the code.
+- Out of scope: do not change {{P}}IF_DISCOUNT.
+- If a business rule is missing or two business rules contradict, do not create
+  the object. Report the gap.
+
+# 7. Acceptance
+- The class is active and has no syntax error.
+- Write your own ABAP Unit tests for the class.