{"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-2v1hqaky","versions":[{"created_at":"2026-06-13T20:46:41Z","element_count":73,"note":"5軸GA polish 44->97 by M5 (autonomous)","saved_by":"mcp","sha256":"ffc1afae725fae883cf531bbd9528dda03b46518eb745599dd3285d3d79b86f9","version":3},{"created_at":"2026-06-13T20:21:45Z","element_count":105,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"f14868093d38f15e719f6763a160e133e09f41c418b3817aff06f24099ecdb9f","version":2},{"created_at":"2026-06-13T20:21:43Z","element_count":105,"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}]}