{"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-epg26jwj","versions":[{"created_at":"2026-07-13T10:09:58Z","element_count":84,"note":"5軸GA polish 44->95 by M5 (autonomous)","saved_by":"mcp","sha256":"6c42c5f6425a5c873b6dfc7bfdaa04878703002e5712fd579e2895bcb3948b90","version":3},{"created_at":"2026-07-13T09:49:23Z","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":"6a4075475b0c34f4db34575fb7afb47fa52e97bbaab640028c26bcb0715938dd","version":2},{"created_at":"2026-07-13T09:49:23Z","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}]}