{"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-a5xlwr6a","versions":[{"created_at":"2026-06-17T08:00:19Z","element_count":253,"note":"言葉から生成: L字 / 越屋根のある自然素材の家・通風重視 / 越屋根(妻側) / 吹抜(南面) / 高窓(北面) / 中庭(東面)","saved_by":"mcp:create","sha256":"","version":1}]}