{"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-house-apn6045a","versions":[{"created_at":"2026-06-11T00:48:19Z","element_count":72,"note":"5軸GA polish 47->96 by M5 (autonomous)","saved_by":"mcp","sha256":"aaabc262f6350e0c75eed68e0e1e9aa8abc1a988f52efaf6ccc6cd94503959fd","version":15},{"created_at":"2026-06-10T22:07:49Z","element_count":50,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"0f3067124d1d9b3a80e2037e0e54a38e3f4e027366962e5036032e7cfbc19504","version":2}]}