STRU and exception tasks accepted; G6 cascade fix, exception class mutants, RTTI unit notes

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

tasks_gen/train/G1140/generation.json

@@ -0,0 +1,34 @@
+{
+ "id": "G1140",
+ "pool": "train",
+ "object_type": "PROG",
+ "category": "B",
+ "attempts": [
+  {
+   "stage": "bundle",
+   "errors": [
+    "Too close to task G0020 (similarity spec 0.67, rules 0.49, names 1.00). Choose a different business topic and different object names.",
+    "Too close to task G0183 (similarity spec 0.60, rules 0.00, names 1.00). Choose a different business topic and different object names."
+   ],
+   "by_check": {
+    "extra": 2
+   }
+  },
+  {
+   "stage": "validate",
+   "oracle": 86.7,
+   "null": 0
+  },
+  {
+   "stage": "validate",
+   "oracle": 100.0,
+   "null": 0,
+   "mutation": {
+    "valid": 2,
+    "killed": 2,
+    "ok": true
+   }
+  }
+ ],
+ "accepted": true
+}