Upload optimizer failure diagnostics

optimization_cpu_nemotron/20260822T215553Z/failure.json

@@ -0,0 +1,4 @@
+{
+  "error": "BASE_TRAINER not found: /kaggle/working/100kaggle_final_crt_mtf_hierarchy_2025_2026.py",
+  "run_id": "20260822T215553Z"
+}