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/task.json

@@ -0,0 +1,111 @@
+{
+  "id": "G0026",
+  "category": "A",
+  "object_type": "FUNC",
+  "difficulty": 2,
+  "release_target": "v816",
+  "expected_outcome": "implement",
+  "budget": {
+    "max_tool_calls": 40,
+    "max_activations": 10
+  },
+  "seed": [
+    {
+      "type": "FUGR",
+      "name": "{{P}}FG_RENT",
+      "description": "Rental pricing"
+    },
+    {
+      "type": "FUNC",
+      "name": "{{P}}RENT_SAMPLE",
+      "functionGroup": "{{P}}FG_RENT",
+      "file": "seed/rent_sample.func.abap",
+      "description": "Sample pricing module"
+    }
+  ],
+  "contract": [
+    {
+      "type": "FUNC",
+      "name": "{{P}}RENT_PRICE",
+      "functionGroup": "{{P}}FG_RENT",
+      "params": [
+        {
+          "name": "iv_vehicle_class",
+          "type": "string"
+        },
+        {
+          "name": "iv_minutes",
+          "type": "i"
+        },
+        {
+          "name": "iv_km",
+          "type": "i"
+        },
+        {
+          "name": "iv_member",
+          "type": "abap_bool"
+        },
+        {
+          "name": "iv_weekend",
+          "type": "abap_bool"
+        },
+        {
+          "name": "ev_time_fee",
+          "type": "decfloat34"
+        },
+        {
+          "name": "ev_distance_fee",
+          "type": "decfloat34"
+        },
+        {
+          "name": "ev_surcharge",
+          "type": "decfloat34"
+        },
+        {
+          "name": "ev_discount",
+          "type": "decfloat34"
+        },
+        {
+          "name": "ev_total",
+          "type": "decfloat34"
+        }
+      ]
+    }
+  ],
+  "out_of_scope": [
+    "{{P}}RENT_SAMPLE"
+  ],
+  "hidden_tests": [
+    {
+      "type": "CLAS",
+      "name": "{{P}}T14_HIDDEN",
+      "file": "hidden/t14_hidden.clas.abap",
+      "description": "T14 hidden tests"
+    }
+  ],
+  "reference": [
+    {
+      "type": "CLAS",
+      "name": "{{P}}CL_RENT",
+      "file": "reference/cl_rent.clas.abap",
+      "testclasses_file": "reference/cl_rent.clas.testclasses.abap",
+      "description": "Rental price calculation"
+    },
+    {
+      "type": "FUNC",
+      "name": "{{P}}RENT_PRICE",
+      "functionGroup": "{{P}}FG_RENT",
+      "file": "reference/rent_price.func.abap",
+      "description": "Rental pricing module"
+    },
+    {
+      "type": "CLAS",
+      "name": "{{P}}T14_TEST",
+      "file": "reference/t14_test.clas.abap",
+      "description": "T14 own tests"
+    }
+  ],
+  "craft_checks": [
+    "method_length"
+  ]
+}