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/G0120/spec.md

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+# 1. Goal
+A water utility bills its customers for the water that they use. The billing
+program needs one service that calculates the consumption of each water meter
+from the readings of a period.
+
+# 2. Open questions
+None.
+
+# 3. Context
+- The interface {{P}}IF_METER_READING exists in package $TMP. It is active.
+- The interface contains these public types:
+  TY_METER_ID (CHAR 10), TY_READING_DATE (date), TY_VALUE (integer),
+  TY_READING (METER_ID, READING_DATE, READING_VALUE),
+  TT_READINGS (a table of TY_READING),
+  TY_RESULT (METER_ID, OPENING_VALUE, CLOSING_VALUE, CONSUMPTION),
+  TT_RESULT (a table of TY_RESULT).
+- The interface has one method:
+  CALCULATE IMPORTING it_readings TYPE tt_readings
+            RETURNING VALUE(rt_result) TYPE tt_result.
+- A reading is the meter value in cubic metres that a reader wrote down on a
+  date.
+
+# 4. Contract
+- Create the class {{P}}METER_CONSUMPTION in package $TMP.
+- The class is public, final, and has a public constructor without parameters.
+- The class implements {{P}}IF_METER_READING.
+- Do not add other public methods.
+
+# 5. Business rules
+The method gets the readings of all meters of one period. The input table can be
+unsorted. It can contain more than one reading for the same meter and the same
+date.
+1. Ignore every reading whose value is less than zero.
+2. If two or more readings have the same meter ID and the same date, only the
+   reading with the highest value counts. Ignore the other readings of that
+   date.
+3. For each meter, the opening value is the value of the earliest date of the
+   meter, and the closing value is the value of the latest date of the meter.
+   If a meter has only one reading, the opening value and the closing value are
+   the value of that reading.
+4. The consumption of a meter is the closing value minus the opening value. If
+   that difference is less than zero, the consumption is zero.
+5. The result has one row for each meter with at least one reading that rule 1
+   does not ignore.
+6. The result is sorted by meter ID in ascending order.
+7. If no reading remains after rule 1, the result is empty.
+
+# 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_METER_READING.
+
+# 7. Acceptance
+- The class is active and has no syntax error.
+- The hidden tests pass.
+- Write your own ABAP Unit tests for the class.