{"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-8z95ow4o","versions":[{"created_at":"2026-08-02T17:46:25Z","element_count":82,"note":"loop3: 設計時延床 84.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"1a398d38fa9696242984dd7fe9e2207aa321e3f48b8f21255bb14037869b897f","version":2},{"created_at":"2026-08-02T17:46:25Z","element_count":82,"note":"言葉から生成: LDK+主寝室+子供室2+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}