Object type mix: INTF, TABL, STRU, MSAG, exception tasks (harness G2, mutants, generator notes), balanced generator, kind-deficit job order, dashboard mix card

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

tasks_gen/train/G1901/generation.json

@@ -0,0 +1,19 @@
+{
+ "id": "G1901",
+ "pool": "train",
+ "object_type": "TABL",
+ "category": "B",
+ "attempts": [
+  {
+   "stage": "validate",
+   "oracle": 100.0,
+   "null": 0,
+   "mutation": {
+    "valid": 4,
+    "killed": 4,
+    "ok": true
+   }
+  }
+ ],
+ "accepted": true
+}