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/G0107/spec.md

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+# 1. Goal
+
+An energy supplier bills households for electricity. The billing program calls
+one function module for each household. The function module calculates the bill
+of one month.
+
+# 2. Open questions
+
+None.
+
+# 3. Context
+
+- The function group {{P}}FG_BILL exists in package $TMP. The group is empty.
+- The billing program calls the function module once for each household. It
+  passes the consumption of the month, the tariff, and the payment method.
+- The consumption is a quantity in kilowatt hours (kWh).
+- The bill is an amount in euro.
+
+# 4. Contract
+
+- Create the function module {{P}}ENERGY_BILL in function group {{P}}FG_BILL.
+- Use this interface:
+
+| Parameter | Kind | Type | Meaning |
+| --- | --- | --- | --- |
+| iv_consumption | Importing | decfloat34 | Consumption of the month in kWh |
+| iv_tariff | Importing | string | Tariff code |
+| iv_direct_debit | Importing | abap_bool | abap_true if the customer pays by direct debit |
+| ev_bill | Exporting | decfloat34 | Bill in euro |
+| invalid_consumption | Exception | | See rule 1 |
+| invalid_tariff | Exception | | See rule 2 |
+
+# 5. Business rules
+
+1. If the consumption is less than zero, raise the exception
+   INVALID_CONSUMPTION. Do not set the bill.
+2. The valid tariff codes are BASIC, GREEN, and NIGHT. Any other tariff code
+   raises the exception INVALID_TARIFF. Do not set the bill.
+3. Every bill contains a base fee of 12.00 euro.
+4. The working price for one kWh is:
+   - BASIC: 0.32 euro
+   - GREEN: 0.38 euro
+   - NIGHT: 0.24 euro
+5. For a consumption above 300 kWh, the working price of the part above 300 kWh
+   is 80 % of the working price of the tariff.
+6. If the customer pays by direct debit, the bill is 2 % lower.
+7. Round the bill half up to 2 decimals.
+
+# 6. Constraints
+
+- Release target: ABAP Platform 2025 (SAP_BASIS 816).
+- Package: $TMP. Do not use transports.
+- Coding standard: Clean ABAP. Keep every method below 40 statements.
+- Out of scope: database access, CDS views, reports, ALV, dynpro, and changes
+  to other objects.
+
+# 7. Acceptance
+
+- The function module {{P}}ENERGY_BILL is active and has no syntax error.
+- The hidden tests pass.
+- Write ABAP Unit tests for the function module in a global test class.