{"note":"bim_versions 導入後の保存のみ記録 (それ以前は bim_canonical 上書きで履歴なし)","ok":true,"slug":"u-theoldmillhouse-8b7n6zge","versions":[{"created_at":"2026-06-10T22:54:00Z","element_count":77,"note":"legacy fix: jpy102533759→quote19615588 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"a1538e43525e022c56d0bf68eaa8c97025700d2849d93f6fca7c23913372530b","version":10},{"created_at":"2026-06-10T17:23:12Z","element_count":73,"note":"5軸GA polish 43->97 by M5 (autonomous)","saved_by":"mcp","sha256":"2c730634dcad9baf75f1fbce24dfce3e7a4965fc2102bca2a56c3c0139e45ee3","version":2}]}