{"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-qbo0dxvx","versions":[{"created_at":"2026-08-01T19:35:57Z","element_count":101,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"fc2fa7413586fc88e3091ba6b2e9b04189f9df2cc7cb011af6ef8710aa5b9a76","version":2},{"created_at":"2026-08-01T19:35:57Z","element_count":101,"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}]}