More SFT warmup (40 steps) for better JSON format

train.py

@@ -34,7 +34,7 @@ except Exception as e:
     print(f"Repo create: {e}")
 
 MAX_SEQ_LEN = 1024
-SFT_STEPS = 20  # 50 done, 20 remaining to reach 70
+SFT_STEPS = 40  # More warmup for JSON format
 GRPO_STEPS = 250
 GRPO_K = 2
 GRPO_LR = 1e-5