{"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-7zfnnc5k","versions":[{"created_at":"2026-07-01T06:56:34Z","element_count":90,"note":"5軸GA polish 43->96 by M5 (autonomous)","saved_by":"mcp","sha256":"cae72a963f8e30fc507cac071e87fb9a37e960cb23d3641d6233cd1d5d230aa5","version":3},{"created_at":"2026-07-01T06:42:12Z","element_count":85,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"0f6169e406628824612f508e4c6761d005ce357f599dc50502908e442c5c2b6b","version":2},{"created_at":"2026-07-01T06:42:12Z","element_count":85,"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}]}