{"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-ozrzr3bk","versions":[{"created_at":"2026-07-24T19:28:40Z","element_count":130,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"1d521f1206ff50f0bdac83b9d61806847be289fdd2291d7995369c1597e61a1a","version":2},{"created_at":"2026-07-24T19:28:40Z","element_count":130,"note":"言葉から生成: LDK+主寝室+子供室+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}