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/G0100/task.json

@@ -0,0 +1,41 @@
+{
+  "id": "G0100",
+  "category": "A",
+  "object_type": "CLAS",
+  "difficulty": 2,
+  "release_target": "v816",
+  "expected_outcome": "implement",
+  "budget": {
+    "max_tool_calls": 50,
+    "max_activations": 12
+  },
+  "seed": [],
+  "contract": [
+    {
+      "type": "CLAS",
+      "name": "{{P}}SUPPLIER_SCORE"
+    }
+  ],
+  "out_of_scope": [],
+  "hidden_tests": [
+    {
+      "type": "CLAS",
+      "name": "{{P}}T02_HIDDEN",
+      "file": "hidden/t02_hidden.clas.abap",
+      "description": "T02 hidden tests for the supplier score"
+    }
+  ],
+  "reference": [
+    {
+      "type": "CLAS",
+      "name": "{{P}}SUPPLIER_SCORE",
+      "file": "reference/supplier_score.clas.abap",
+      "description": "Supplier score calculator",
+      "testclasses_file": "reference/supplier_score.testclasses.abap"
+    }
+  ],
+  "craft_checks": [
+    "method_length",
+    "db_operation_in_loop"
+  ]
+}