Fix coverage with several contract classes; table annotation and file path checks; clean task dir on write

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014aUaQeLnwbb1zTpN7kHeat

tasks_gen/eval/G0123/task.json

@@ -0,0 +1,76 @@
+{
+  "id": "G0123",
+  "category": "C",
+  "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_LIFT",
+      "description": "Function group for the lift statistics"
+    }
+  ],
+  "contract": [
+    {
+      "type": "FUNC",
+      "name": "{{P}}LIFT_STATS",
+      "functionGroup": "{{P}}FG_LIFT",
+      "params": [
+        {
+          "name": "iv_scans",
+          "type": "string"
+        },
+        {
+          "name": "iv_lifts",
+          "type": "string"
+        },
+        {
+          "name": "ev_rides",
+          "type": "i"
+        },
+        {
+          "name": "ev_passes",
+          "type": "i"
+        },
+        {
+          "name": "ev_report",
+          "type": "string"
+        }
+      ]
+    }
+  ],
+  "out_of_scope": [],
+  "hidden_tests": [
+    {
+      "type": "CLAS",
+      "name": "{{P}}T21_HIDDEN",
+      "file": "hidden/t21_hidden.clas.abap",
+      "description": "T21 hidden tests"
+    }
+  ],
+  "reference": [
+    {
+      "type": "FUNC",
+      "name": "{{P}}LIFT_STATS",
+      "functionGroup": "{{P}}FG_LIFT",
+      "file": "reference/lift_stats.func.abap",
+      "description": "Lift statistics"
+    },
+    {
+      "type": "CLAS",
+      "name": "{{P}}T21_TEST",
+      "file": "reference/t21_test.clas.abap",
+      "description": "T21 own tests"
+    }
+  ],
+  "craft_checks": [
+    "method_length",
+    "no_nested_loops"
+  ]
+}