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/G0023/spec.md

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+# 1. Goal
+
+A freight forwarder calculates the freight cost of a shipment. A legacy class
+calculates this cost today. Write the calculation as a clean class. The cost of
+every shipment must stay the same.
+
+# 2. Open questions
+None.
+
+# 3. Context
+- The interface {{P}}IF_FREIGHT_CALC exists in package $TMP and is active.
+- The legacy class {{P}}FREIGHT_LEGACY exists in package $TMP and is active. It
+  implements {{P}}IF_FREIGHT_CALC. Its results are the reference for the new class.
+- The interface declares the types TY_ZONE (character, length 2), TY_WEIGHT
+  (packed number, length 9, 3 decimal places) and TY_AMOUNT (packed number,
+  length 7, 2 decimal places), and the method CALCULATE.
+
+# 4. Contract
+- Create the class {{P}}FREIGHT_CALCULATOR in package $TMP.
+- The class is public, final, and has a public constructor without parameters.
+- The class implements {{P}}IF_FREIGHT_CALC.
+- Do not add other public methods.
+
+# 5. Business rules
+
+All amounts are packed numbers with 2 decimal places. Round an amount to
+2 decimal places before you use it in the next step. Round half away from zero.
+
+1. Zone
+   The zone is a two-character code. These zones exist:
+
+   zone  base   per kg  minimum  surcharge factor
+   DE    12.50  0.85    25.00    0.065
+   FR    15.00  1.10    30.00    0.075
+   NL    10.00  0.75    20.00    0.055
+   US    20.00  1.40    45.00    0.085
+   CN    25.00  1.25    50.00    0.095
+
+   If the zone is not one of these, the result is 0.00 and no other rule applies.
+
+2. Weight charge
+   weight charge = weight * per kg of the zone, rounded to 2 decimal places.
+
+3. Freight
+   freight = base of the zone + weight charge.
+   If freight is less than the minimum of the zone, freight is the minimum.
+
+4. Surcharge
+   surcharge = freight * surcharge factor of the zone, rounded to 2 decimal places.
+
+5. Total
+   total = freight + surcharge.
+
+6. Heavy shipment
+   If the weight is greater than 1000.000 kg, total = total * 0.95, rounded to
+   2 decimal places.
+
+7. The result is total.
+
+# 6. Constraints
+- Release target: SAP_BASIS 816 (ABAP Platform 2025).
+- 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_FREIGHT_CALC and {{P}}FREIGHT_LEGACY.
+
+# 7. Acceptance
+- The class is active and has no syntax error.
+- The hidden tests pass.
+- Write your own ABAP Unit tests for the class.