Fix coverage with several contract classes; table annotation and file path checks; clean task dir on write

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

tasks_gen/eval/G0124/spec.md

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+# 1. Goal
+Show the milk deliveries of each farm in an ALV list. The cooperative uses the
+list to compare the farms of a region for a period.
+
+# 2. Open questions
+None.
+
+# 3. Context
+- Table {{P}}FARM exists in package $TMP. It contains data.
+  Fields: FARM_ID (CHAR 10, key), FARM_NAME (CHAR 40), REGION (CHAR 4).
+- Table {{P}}MILK exists in package $TMP. It contains data.
+  Fields: DELIV_ID (INT4, key), FARM_ID (CHAR 10), DELIV_DATE (DATS),
+  LITRES (DEC 13,2).
+
+# 4. Contract
+- Create the executable program {{P}}MILK_SUM in package $TMP.
+- Selection screen:
+  - Parameter P_FROM, type DATS, mandatory: the first delivery date to include.
+  - Parameter P_TO, type DATS, mandatory: the last delivery date to include.
+  - Select-option S_REG for the region.
+- Show the result with CL_SALV_TABLE. The output table has these columns, with
+  these names: FARM_ID, FARM_NAME, REGION, LITRES, DELIVERIES.
+
+# 5. Business rules
+1. Include a delivery only if DELIV_DATE is on or after P_FROM and on or before
+   P_TO. Both limits are included.
+2. Include a farm only if REGION is in S_REG. An empty S_REG includes every
+   region. A line with sign E in S_REG excludes its region.
+3. Show one line for each included farm. A farm without an included delivery also
+   gets a line.
+4. LITRES is the sum of the litres of the included deliveries of the farm. LITRES
+   is 0 if the farm has no included delivery.
+5. DELIVERIES is the number of included deliveries of the farm. DELIVERIES is 0
+   if the farm has no included delivery.
+6. Sort the lines by LITRES, the highest value first. If two lines have the same
+   LITRES, sort them by FARM_ID, the lowest value first.
+7. FARM_NAME and REGION are the values of the farm.
+
+# 6. Constraints
+- Release target: 7.58.
+- Coding standards: Clean ABAP. Read each table with one database access.
+- Out of scope: do not change {{P}}FARM and {{P}}MILK.
+
+# 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.