Pipeline controller: plan 2 (hard +, error +50 %), backlog throttle, 2 trajectory workers, stop rules, summaries every 50; budget reserve

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

tasks_gen/train/_logs/G1012.json

@@ -0,0 +1,31 @@
+{
+ "id": "G1012",
+ "pool": "train",
+ "object_type": "DDLS",
+ "category": "B",
+ "attempts": [
+  {
+   "stage": "validate",
+   "oracle": 100.0,
+   "null": 0,
+   "mutation": {
+    "valid": 5,
+    "killed": 3,
+    "ok": false
+   }
+  },
+  {
+   "stage": "validate",
+   "oracle": 100.0,
+   "null": 0,
+   "mutation": {
+    "valid": 5,
+    "killed": 5,
+    "ok": true
+   }
+  }
+ ],
+ "accepted": true,
+ "error_kind": null,
+ "spent_total": 68.7355
+}