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/G1018/spec.md

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+# 1. Goal
+Calculate the price of a classified advertisement for a newspaper. The sales
+desk calls one function module for each advertisement order, before it saves
+the order.
+
+# 2. Open questions
+None.
+
+# 3. Context
+- Function group {{P}}FG_AD exists in package $TMP.
+- The sales desk calls the new function module for each advertisement order.
+
+# 4. Contract
+- Create the function module {{P}}AD_PRICE in function group {{P}}FG_AD.
+- The interface of {{P}}AD_PRICE is:
+  - importing iv_lines type i: the number of lines of the advertisement.
+  - importing iv_insertions type i: the number of times that the advertisement
+    is printed.
+  - importing iv_photo type abap_bool: abap_true if the advertisement has a
+    photo.
+  - exporting ev_price type decfloat34: the price of the advertisement in euro.
+  - exceptions invalid_lines and invalid_insertions.
+
+# 5. Business rules
+1. If iv_lines is less than 1, raise the exception INVALID_LINES.
+2. If iv_insertions is less than 1, raise the exception INVALID_INSERTIONS.
+3. One line of the advertisement costs 12.45 euro.
+4. A photo costs 25.00 euro. Charge the photo once for each order.
+5. The discount applies to the sum of the line price and the photo price:
+   - 1 or 2 insertions: no discount.
+   - 3, 4 or 5 insertions: 10 % discount.
+   - 6 or more insertions: 20 % discount.
+6. Round the price half up to 2 decimals.
+7. The minimum price is 20.00 euro. Apply the minimum price after the discount
+   and after the rounding.
+
+# 6. Constraints
+- Release target: 7.40 SP05. Use only ABAP syntax that release 7.40 SP05
+  supports. Do not use inline declarations or constructor expressions.
+- Coding standards: Clean ABAP. Keep every method below 40 statements.
+- Out of scope: database tables, reports, ALV lists, and other function
+  modules.
+
+# 7. Acceptance
+- The function module is active and has no syntax error.
+- The hidden tests pass.
+- Write ABAP Unit tests for the function module in a global test class.