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/G1310/generation.json

@@ -0,0 +1,16 @@
+{
+ "id": "G1310",
+ "pool": "train",
+ "category": "K",
+ "base_task": "G1005",
+ "style": "free_text",
+ "tool_schema": null,
+ "attempts": [
+  {
+   "stage": "validate",
+   "oracle": 100.0,
+   "null": 0
+  }
+ ],
+ "accepted": true
+}