{"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-4xmgzb4q","versions":[{"created_at":"2026-06-11T01:05:16Z","element_count":68,"note":"5軸GA polish 47->96 by M5 (autonomous)","saved_by":"mcp","sha256":"ce7bb5d53c14875d579ddeb36ef634bef12d4891ad0da3ca034a2d21f25a9294","version":13},{"created_at":"2026-06-10T22:21:27Z","element_count":54,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"98dbd90857ba15364598d6bd42ea37cb6450324f25bc3cf8324350081b3bdb16","version":2}]}