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/hidden/e01_hidden.clas.abap

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+CLASS {{p}}e01_hidden DEFINITION PUBLIC FINAL CREATE PUBLIC
+  FOR TESTING DURATION SHORT RISK LEVEL HARMLESS.
+  PRIVATE SECTION.
+    DATA mo_cut TYPE REF TO {{p}}if_freight_calc.
+    METHODS setup.
+    METHODS assert_cost
+      IMPORTING iv_zone   TYPE {{p}}if_freight_calc=>ty_zone
+                iv_weight TYPE {{p}}if_freight_calc=>ty_weight
+                iv_exp    TYPE {{p}}if_freight_calc=>ty_amount.
+    METHODS unknown_zone_is_zero FOR TESTING.
+    METHODS minimum_applies_after_charge FOR TESTING.
+    METHODS weight_charge_rounds_half_up FOR TESTING.
+    METHODS all_zones_are_rated FOR TESTING.
+    METHODS surcharge_uses_minimum FOR TESTING.
+    METHODS heavy_discount_on_total FOR TESTING.
+    METHODS no_discount_at_exactly_1000 FOR TESTING.
+    METHODS discount_rounds_half_up FOR TESTING.
+    METHODS small_weight_uses_minimum FOR TESTING.
+ENDCLASS.
+
+
+CLASS {{p}}e01_hidden IMPLEMENTATION.
+  METHOD setup.
+    mo_cut = NEW {{p}}freight_calculator( ).
+  ENDMETHOD.
+
+  METHOD assert_cost.
+    cl_abap_unit_assert=>assert_equals(
+      exp = iv_exp
+      act = mo_cut->calculate( iv_zone = iv_zone iv_weight = iv_weight )
+      msg = |zone { iv_zone }, weight { iv_weight }| ).
+  ENDMETHOD.
+
+  METHOD unknown_zone_is_zero.
+    assert_cost( iv_zone = 'XX' iv_weight = '500.000' iv_exp = '0.00' ).
+  ENDMETHOD.
+
+  METHOD minimum_applies_after_charge.
+    assert_cost( iv_zone = 'DE' iv_weight = '1.000' iv_exp = '26.63' ).
+  ENDMETHOD.
+
+  METHOD weight_charge_rounds_half_up.
+    assert_cost( iv_zone = 'CN' iv_weight = '20.004' iv_exp = '54.76' ).
+  ENDMETHOD.
+
+  METHOD all_zones_are_rated.
+    assert_cost( iv_zone = 'DE' iv_weight = '100.000' iv_exp = '103.84' ).
+    assert_cost( iv_zone = 'FR' iv_weight = '20.000' iv_exp = '39.78' ).
+    assert_cost( iv_zone = 'NL' iv_weight = '50.000' iv_exp = '50.11' ).
+    assert_cost( iv_zone = 'US' iv_weight = '50.000' iv_exp = '97.65' ).
+    assert_cost( iv_zone = 'CN' iv_weight = '100.000' iv_exp = '164.25' ).
+  ENDMETHOD.
+
+  METHOD surcharge_uses_minimum.
+    assert_cost( iv_zone = 'NL' iv_weight = '0.000' iv_exp = '21.10' ).
+  ENDMETHOD.
+
+  METHOD heavy_discount_on_total.
+    assert_cost( iv_zone = 'DE' iv_weight = '1500.000' iv_exp = '1302.63' ).
+  ENDMETHOD.
+
+  METHOD no_discount_at_exactly_1000.
+    assert_cost( iv_zone = 'DE' iv_weight = '1000.000' iv_exp = '918.56' ).
+  ENDMETHOD.
+
+  METHOD discount_rounds_half_up.
+    assert_cost( iv_zone = 'DE' iv_weight = '1090.070' iv_exp = '950.10' ).
+  ENDMETHOD.
+
+  METHOD small_weight_uses_minimum.
+    assert_cost( iv_zone = 'FR' iv_weight = '5.000' iv_exp = '32.25' ).
+  ENDMETHOD.
+ENDCLASS.