{"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-q18f4i2y","versions":[{"created_at":"2026-07-13T10:23:54Z","element_count":88,"note":"5軸GA polish 38->93 by M5 (autonomous)","saved_by":"mcp","sha256":"69f78ffe99169ef062e68939982c77363ab6acdbef4c516e6c4ba7e6117315a3","version":3},{"created_at":"2026-07-13T10:05:37Z","element_count":83,"note":"loop3: 設計時延床 55.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"80766500d2d4e5f6708c205bc05ffaba528a1530a0846700f77ef446eedb4506","version":2},{"created_at":"2026-07-13T10:05:37Z","element_count":83,"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}]}