{"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-3mc2c0lc","versions":[{"created_at":"2026-06-10T13:12:36Z","element_count":77,"note":"backfill: 延床=居室床スラブ実面積87.5㎡(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":"a9f4a33b982d25e7fecae7ef8813bad9b914200654878870a3e6f9a7e9178e16","version":11},{"created_at":"2026-06-10T08:48:35Z","element_count":71,"note":"5軸GA polish 61->96 by M5 (autonomous)","saved_by":"mcp","sha256":"ef0e5da7f87a300a22dd633d0f850c0b411f6cc2afc9ee4aa21571bef4a5a542","version":3}]}