{"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-e9vawnyt","versions":[{"created_at":"2026-07-17T14:00:03Z","element_count":68,"note":"5軸GA polish 43->95 by M5 (autonomous)","saved_by":"mcp","sha256":"4313862d01839713632c701962bd8dc8920b8191abeea8af4ddf8a75abec390e","version":3},{"created_at":"2026-07-17T13:57:22Z","element_count":88,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"0c8c830e0aab76c7067aab7af0286cb475059b410cfb943139bc2e27117c8048","version":2},{"created_at":"2026-07-17T13:57:21Z","element_count":88,"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}]}