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/G0108/spec.md

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+# 1. Goal
+Give the charge of each phone call. A billing program will read the charges, so the
+calculation must be in the database, in a CDS view.
+
+# 2. Open questions
+None.
+
+# 3. Context
+- Table {{P}}CALLS (phone calls), package $TMP. Key: CALL_ID (CHAR 10).
+  Fields: CUSTOMER (CHAR 10), CALL_DATE (DATS), START_TIME (TIMS), DURATION_SEC (INT4),
+  DEST_TYPE (CHAR 1).
+
+# 4. Contract
+- Create the CDS view entity {{P}}I_CALL_CHARGE in package $TMP.
+- Elements, with these names: CALL_ID (key), CUSTOMER, BILLABLE_MIN, RATE, CHARGE.
+- No authorization check (#NOT_REQUIRED).
+
+# 5. Business rules
+1. Show one row for each call.
+2. BILLABLE_MIN is the duration in minutes, rounded up to the next full minute. A call
+   of 1 second counts as 1 minute.
+3. RATE is the price per minute for the destination type:
+   - 'N' (national): 0.09
+   - 'I' (international): 0.25
+   - any other value: 0.15
+4. Calls longer than 1800 seconds get a 10% discount on the charge.
+5. CHARGE is BILLABLE_MIN multiplied by RATE, with the discount applied, rounded to 2
+   decimals.
+
+# 6. Constraints
+- Release target: 8.16.
+- Out of scope: do not change {{P}}CALLS.
+
+# 7. Acceptance
+- The view is active and has no syntax error.
+- The hidden tests pass.
+- Write ABAP Unit tests with CL_CDS_TEST_ENVIRONMENT in a global test class.