{"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-layhamsfarmhouse-t2wl52dt","versions":[{"created_at":"2026-06-10T13:22:11Z","element_count":85,"note":"backfill: 延床=居室床スラブ実面積81.4㎡(基礎/屋外/ロフト除外)。設備数量/コスト過大の是正","saved_by":"mcp","sha256":"42953ddb9d392a8e7e67cec89ccfb88678d3f8f3fa6411994638b80566ac7043","version":10},{"created_at":"2026-06-10T10:23:13Z","element_count":72,"note":"5軸GA polish 43->96 by M5 (autonomous)","saved_by":"mcp","sha256":"a71d117df1b380a131a8ec3bb591d4b053ae58b926397b95087ef0567bdc7c71","version":2}]}