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/task.json

@@ -0,0 +1,58 @@
+{
+  "id": "G0023",
+  "category": "E",
+  "object_type": "CLAS",
+  "difficulty": 2,
+  "release_target": "v816",
+  "expected_outcome": "implement",
+  "budget": {
+    "max_tool_calls": 60,
+    "max_activations": 15
+  },
+  "seed": [
+    {
+      "type": "INTF",
+      "name": "{{P}}IF_FREIGHT_CALC",
+      "file": "seed/if_freight_calc.intf.abap",
+      "description": "Freight calculation contract with packed number types"
+    },
+    {
+      "type": "CLAS",
+      "name": "{{P}}FREIGHT_LEGACY",
+      "file": "seed/freight_legacy.clas.abap",
+      "description": "Legacy freight calculator with packed arithmetic and a CASE over zones"
+    }
+  ],
+  "contract": [
+    {
+      "type": "CLAS",
+      "name": "{{P}}FREIGHT_CALCULATOR",
+      "implements": "{{P}}IF_FREIGHT_CALC"
+    }
+  ],
+  "out_of_scope": [
+    "{{P}}IF_FREIGHT_CALC",
+    "{{P}}FREIGHT_LEGACY"
+  ],
+  "hidden_tests": [
+    {
+      "type": "CLAS",
+      "name": "{{P}}E01_HIDDEN",
+      "file": "hidden/e01_hidden.clas.abap",
+      "description": "E01 hidden tests for the refactored freight calculator"
+    }
+  ],
+  "reference": [
+    {
+      "type": "CLAS",
+      "name": "{{P}}FREIGHT_CALCULATOR",
+      "file": "reference/freight_calculator.clas.abap",
+      "description": "Refactored freight calculator with a rate table",
+      "testclasses_file": "reference/freight_calculator.testclasses.abap"
+    }
+  ],
+  "craft_checks": [
+    "method_length",
+    "no_global_variables"
+  ]
+}