{"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-8bcz54qh","versions":[{"created_at":"2026-07-17T14:13:53Z","element_count":82,"note":"5軸GA polish 40->94 by M5 (autonomous)","saved_by":"mcp","sha256":"f0403490287e51bd2f8c9e4d2193d9b0ea6d052b24152e50e8866da95a964201","version":3},{"created_at":"2026-07-17T14:04:45Z","element_count":119,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"014171c957efe7f602860760e14a5a4dbc2953988ca476660ed2eea76d9f58a2","version":2},{"created_at":"2026-07-17T14:04:45Z","element_count":119,"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}]}