{"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-8evy9bya","versions":[{"created_at":"2026-06-10T13:13:29Z","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":"16958545b44ff36090385d755b100a5b3a75b5c0c420f6ea44ed883828430dd3","version":10},{"created_at":"2026-06-10T09:05:48Z","element_count":89,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"e4d47d394de6128feee9cc672d8d105a7f53db9f88202ea8795eb84a8e9bf031","version":2}]}