Hard batch G0022-G0026: 5/5 accepted; budget floor, CDS checks, mutation check

- generator: budget floor (2x oracle activations, 3x calls), static checks for CDS
  $parameters and UNION annotation
- harness/mutation.py: deterministic mutants of the reference; hidden tests must fail
- G0022 revalidated with harness fixes: oracle 100, null 0
- results in docs/faz1-tasarim.md 11f

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

tasks_gen/eval/G0026/spec.md

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+# 1. Goal
+Calculate the price of a finished car-sharing rental. A booking program calls
+one function module for each finished rental. The function module must have
+the same interface as the sample function module, because the booking program
+calls all pricing modules in the same way.
+
+# 2. Open questions
+None.
+
+# 3. Context
+- Function group {{P}}FG_RENT exists in package $TMP.
+- Function module {{P}}RENT_SAMPLE exists in this function group. It is the
+  sample pricing module. Its interface is the interface that all pricing
+  modules must use.
+- All rental data is in the input parameters. No database access is necessary.
+
+# 4. Contract
+Create the function module {{P}}RENT_PRICE in function group {{P}}FG_RENT.
+The interface is:
+
+  IMPORTING
+    iv_vehicle_class TYPE string
+    iv_minutes       TYPE i
+    iv_km            TYPE i
+    iv_member        TYPE abap_bool
+    iv_weekend       TYPE abap_bool
+  EXPORTING
+    ev_time_fee      TYPE decfloat34
+    ev_distance_fee  TYPE decfloat34
+    ev_surcharge     TYPE decfloat34
+    ev_discount      TYPE decfloat34
+    ev_total         TYPE decfloat34
+  EXCEPTIONS
+    invalid_duration
+    invalid_distance
+    invalid_class
+
+This interface is the same as the interface of {{P}}RENT_SAMPLE.
+
+Put the calculation logic in a new class in package $TMP. The function module
+must only call this class. The function module must not contain the
+calculation itself. The class is your own design decision. The function module
+maps the result of the class to its exporting parameters and exceptions.
+
+# 5. Business rules
+1. Check the input in this sequence:
+   a. If iv_minutes is less than 1, raise INVALID_DURATION.
+   b. If iv_km is less than 0, raise INVALID_DISTANCE.
+   c. If iv_vehicle_class is not 'S', not 'M' and not 'L', raise INVALID_CLASS.
+2. Charge the rental duration in started 15-minute blocks. A duration of 15
+   minutes is one block. A duration of 16 minutes is two blocks.
+3. The price of one block depends on the vehicle class: 'S' costs 3.00, 'M'
+   costs 5.00 and 'L' costs 8.00. The time fee is the number of blocks
+   multiplied by the block price.
+4. The first 10 kilometres of a rental are free. Each further kilometre costs
+   0.25. The distance fee is the number of kilometres above 10 multiplied by
+   0.25.
+5. If iv_weekend is true, the weekend surcharge is 25 % of the time fee.
+   Otherwise the weekend surcharge is 0.
+6. The gross amount is the time fee plus the distance fee plus the weekend
+   surcharge.
+7. If iv_member is true, the member discount is 15 % of the gross amount.
+   Otherwise the member discount is 0.
+8. The total price is the gross amount minus the member discount. If this
+   value is less than 5.00, the total price is 5.00.
+9. Round the weekend surcharge, the member discount and the total price half
+   up to 2 decimals.
+10. Return the time fee in ev_time_fee, the distance fee in ev_distance_fee,
+    the weekend surcharge in ev_surcharge, the member discount in ev_discount
+    and the total price in ev_total.
+
+# 6. Constraints
+- Release target: ABAP Platform 2025 (SAP_BASIS 816).
+- Coding standards: Clean ABAP. Keep every method below 40 statements.
+- Out of scope: do not change {{P}}RENT_SAMPLE.
+
+# 7. Acceptance
+- The function module {{P}}RENT_PRICE is active and has no syntax error.
+- The hidden tests pass.
+- Write ABAP Unit tests for the new class as local test classes.
+- Write ABAP Unit tests for the function module in a global test class.