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/G0111/mutation.json

@@ -0,0 +1,39 @@
+{
+ "task": "G0111",
+ "mutants": [
+  {
+   "object": "{{P}}COURT_USE",
+   "mutant": "line 50: AND -> OR (logic)",
+   "status": "invalid",
+   "hidden": "0/0",
+   "failed_tests": []
+  },
+  {
+   "object": "{{P}}COURT_USE",
+   "mutant": "line 51: AND -> OR (logic)",
+   "status": "killed",
+   "hidden": "0/6",
+   "failed_tests": [
+    "ALL_COURTS",
+    "DATE_FILTER",
+    "DECEMBER_ONLY",
+    "DURATION_CALC",
+    "SPORT_FILTER",
+    "TOTALS_AND_COUNTS"
+   ]
+  },
+  {
+   "object": "{{P}}COURT_USE",
+   "mutant": "line 60: 60 -> 61 (const)",
+   "status": "killed",
+   "hidden": "5/6",
+   "failed_tests": [
+    "DURATION_CALC"
+   ]
+  }
+ ],
+ "valid": 2,
+ "killed": 2,
+ "kill_rate": 1.0,
+ "ok": true
+}