{"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-0u16oo5b","versions":[{"created_at":"2026-06-13T21:01:32Z","element_count":89,"note":"5軸GA polish 39->93 by M5 (autonomous)","saved_by":"mcp","sha256":"4b38297ceb7abaea4a2dc48874ff1e7af4ba21e97eee52279319eff3d1879211","version":3},{"created_at":"2026-06-13T20:56:04Z","element_count":119,"note":"loop3: 設計時延床 70.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"4db94b8d70df51371ba29f58207e9d04af96e7f6053f74f71d40e3c6cd4a754b","version":2},{"created_at":"2026-06-13T20:56:00Z","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}]}