{"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-n3ll2957","versions":[{"created_at":"2026-06-10T13:18:44Z","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":"9a25869077fc386daec7da6d172cafde03a308788bac90db44b4c57c21a85540","version":10},{"created_at":"2026-06-10T10:09:09Z","element_count":72,"note":"5軸GA polish 61->96 by M5 (autonomous)","saved_by":"mcp","sha256":"e9a66d2908b01977602e80dcba9bdb18b7a72b639244a999abc0a1b13919497d","version":2}]}