{"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-0kzn9tpe","versions":[{"created_at":"2026-06-20T19:43:36Z","element_count":83,"note":"5軸GA polish 45->96 by M5 (autonomous)","saved_by":"mcp","sha256":"ffcb04cdc2d35e73ba58185d12b4e46bd09c57401eedc629334ead7b9b8309ad","version":3},{"created_at":"2026-06-20T19:38:26Z","element_count":87,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"6c741e1f1cfd37c17a91d63e56bef1d230819f00f34b6b1510b5c12e1d5fcecc","version":2},{"created_at":"2026-06-20T19:38:25Z","element_count":87,"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}]}