{"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-z48r7im9","versions":[{"created_at":"2026-07-31T07:00:13Z","element_count":90,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"63dfa598c5f9a632c810421fdbbe89321c51752fb43a251b55f9a013f6983209","version":2},{"created_at":"2026-07-31T07:00:13Z","element_count":90,"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}]}