{"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-1ji7lb9l","versions":[{"created_at":"2026-06-10T13:13:35Z","element_count":77,"note":"backfill: 延床=居室床スラブ実面積77.3㎡(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":"0e8aab3e69ffe9769b598f560f947e64919c117451c9d1fc645b16b7fe01b72d","version":10},{"created_at":"2026-06-10T09:05:50Z","element_count":91,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"e91bd842572744c649c0b68e79e694b9af2a3e9ef243bcb7cefe8ecf61d57c3f","version":2}]}