sft_data_stats (재작성본)

total: 100
verifier_log origin: 3 / manual augment: 97
categories: {'tool_call': 3, 'abstain': 25, 'scaffold': 25, 'grounding': 22, 'nl2sql': 25}
sources: {'verifier_log': 3, 'manual': 97}
avg messages chars: 1873
placeholder remaining: 0
golden leaks (exact + fuzzy>0.9): 0
5턴 (verifier_log): 3, 3턴 (manual): 97