Pipeline controller: plan 2 (hard +, error +50 %), backlog throttle, 2 trajectory workers, stop rules, summaries every 50; budget reserve

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

tasks_gen/train/G1043/spec.md

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+# 1. Goal
+A pharmacy calculates the co-payment that a customer pays for a prescription.
+A checkout program calls the calculation before it prints the receipt. The
+program needs the co-payment amount and one reason code for each call.
+
+# 2. Open questions
+None.
+
+# 3. Context
+- The interface {{P}}IF_MED_COPAY exists in package $TMP. It is active.
+- The interface has the types TY_TIER (character, length 1), TY_REASON
+  (character, length 10) and TY_AMOUNT (packed number, length 9, 2 decimals).
+- The interface has the constant structure C_TIER with the values STANDARD,
+  CHRONIC and EXEMPT.
+- The interface has the constant structure C_REASON with the values OK, PRICE,
+  QUANTITY and TIER.
+- The interface has the structure TY_RESULT with the components COPAY (TY_AMOUNT)
+  and REASON (TY_REASON).
+- The interface has one method:
+  CALCULATE
+    IMPORTING iv_price    TYPE ty_amount
+              iv_quantity TYPE i
+              iv_tier     TYPE ty_tier
+    RETURNING VALUE(rs_result) TYPE ty_result.
+
+# 4. Contract
+- Create the class {{P}}MED_COPAY in package $TMP.
+- The class is public, final and has a public constructor without parameters.
+- The class implements {{P}}IF_MED_COPAY.
+- Do not add other public methods.
+
+# 5. Business rules
+Apply the rules in this sequence. Return the reason of the first rule that fails.
+1. If iv_price is zero or less, return the reason PRICE and the co-payment 0.
+2. If iv_quantity is less than 1, return the reason QUANTITY and the co-payment 0.
+3. If iv_tier is not STANDARD, CHRONIC or EXEMPT, return the reason TIER and the
+   co-payment 0.
+4. The total price is iv_price multiplied by iv_quantity.
+5. If iv_tier is EXEMPT, the co-payment is 0. Continue with rule 9.
+6. If iv_tier is CHRONIC, the co-payment is 10 per cent of the total price.
+7. If iv_tier is STANDARD, the co-payment is 30 per cent of the total price.
+8. Round the co-payment to 2 decimals (commercial rounding, half away from zero).
+   Then apply the limits. For CHRONIC the minimum is 5.00 and the maximum is
+   10.00. For STANDARD the minimum is 5.00 and the maximum is 50.00.
+9. If the co-payment is more than the total price, the co-payment is the total
+   price.
+10. Return the reason OK.
+
+# 6. Constraints
+- Release target: SAP_BASIS 816 (ABAP Platform 2025).
+- 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_MED_COPAY.
+
+# 7. Acceptance
+- The class is active and has no syntax error.
+- The hidden tests pass.
+- Write your own ABAP Unit tests for the class.