{"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-pba6vxf5","versions":[{"created_at":"2026-06-10T13:11:49Z","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":11},{"created_at":"2026-06-10T08:32:35Z","element_count":90,"note":"5軸GA polish 56->98 by M5 (autonomous)","saved_by":"mcp","sha256":"2c8455ce5a526a1b3e43418905cc792acb0c0880e39a7ceb0cf288ce14f94b4a","version":3}]}