{"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-g0vqnwh3","versions":[{"created_at":"2026-06-10T13:13:47Z","element_count":66,"note":"backfill: 延床=居室床スラブ実面積93.5㎡(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":"47d0b2350c4845142b33ece9d505c0ae00f333a2e70b7cb0d5c9d65eefc84a5d","version":10},{"created_at":"2026-06-10T09:05:04Z","element_count":85,"note":"5軸GA polish 58->98 by M5 (autonomous)","saved_by":"mcp","sha256":"656d191d78ea8a2cf29de8841817d7e0951f3b6ebb558c80d298710095343d43","version":2}]}