{"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-pban0v1p","versions":[{"created_at":"2026-06-10T13:24:21Z","element_count":63,"note":"backfill: 延床=居室床スラブ実面積118.8㎡(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":"620d2c04951b84efcfb8175f7d2569b8d599f15e8075e3e6e11e605658f58d58","version":10},{"created_at":"2026-06-10T10:53:28Z","element_count":91,"note":"5軸GA polish 60->97 by M5 (autonomous)","saved_by":"mcp","sha256":"f7cc76609a5d50c6b19dcdbd58cc5fcd784e60d9273936f2660b61a854cfe55d","version":3}]}