Snapshot: new training tasks (balanced generation), docs

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

tasks_gen/train/G1941/spec.md

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+# 1. Goal
+Show the green waste that each collection round delivered to the composting
+plant in an ALV list. The plant office uses the list to compare the rounds for
+a period.
+
+# 2. Open questions
+None.
+
+# 3. Context
+- Table {{P}}GWASTE exists in package $TMP. It contains data.
+  Fields: DELIVERY_ID (INT4, key), ROUND_ID (CHAR 6), WASTE_TYPE (CHAR 4),
+  DELIV_DATE (DATS), WEIGHT_KG (DEC 15,2).
+
+# 4. Contract
+- Create the executable program {{P}}COMPOST_SUM in package $TMP.
+- Selection screen:
+  - Parameter P_FROM, type DATS, mandatory: the first delivery date to include.
+  - Select-option S_ROUND for the collection round.
+- Show the result with CL_SALV_TABLE. The output table has these columns, with
+these names: ROUND_ID, TOTAL_KG (sum of WEIGHT_KG), DELIVERIES (number of
+deliveries), HEAVY (number of heavy deliveries).
+
+# 5. Business rules
+1. Include a delivery only if DELIV_DATE is on or after P_FROM and ROUND_ID is
+   in S_ROUND.
+2. Show one line for each round that has at least one included delivery.
+3. A delivery is heavy if WEIGHT_KG is 1000 kg or more.
+4. Sort the lines by TOTAL_KG, the highest total first.
+
+# 6. Constraints
+- Release target: 8.16.
+- Coding standards: Clean ABAP. Read the data with one database access.
+- Out of scope: do not change {{P}}GWASTE.
+
+# 7. Acceptance
+- The program is active and has no syntax error.
+- The hidden tests pass.
+- Write ABAP Unit tests as local test classes in the program.