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/G0127/generation.json

@@ -0,0 +1,29 @@
+{
+ "id": "G0127",
+ "pool": "eval",
+ "object_type": "CLAS",
+ "category": "D",
+ "attempts": [
+  {
+   "stage": "bundle",
+   "errors": [
+    "reference/ferry_load_check.clas.abap line 29: syntax error for release v758 (abaplint): Statement does not exist in the configured ABAP version(or a parser error), \"METHODS\"",
+    "reference/ferry_load_check.clas.abap line 33: syntax error for release v758 (abaplint): Statement does not exist in the configured ABAP version(or a parser error), \"METHODS\""
+   ],
+   "by_check": {
+    "abaplint": 2
+   }
+  },
+  {
+   "stage": "validate",
+   "oracle": 100.0,
+   "null": 0,
+   "mutation": {
+    "valid": 5,
+    "killed": 5,
+    "ok": true
+   }
+  }
+ ],
+ "accepted": true
+}