{"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-8661ofth","versions":[{"created_at":"2026-06-13T21:01:20Z","element_count":85,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"ba2f76839381e000359293917b70b4351a0b97e81851d9155e29080a28e66c59","version":3},{"created_at":"2026-06-13T20:50:05Z","element_count":90,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"d83c53201b13a54fd3c2532372c11f3fc4f181a69c1e79beb34770aff882dce6","version":2},{"created_at":"2026-06-13T20:50:03Z","element_count":90,"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}]}