{"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-l8k5ghoa","versions":[{"created_at":"2026-06-25T19:29:36Z","element_count":89,"note":"5軸GA polish 44->97 by M5 (autonomous)","saved_by":"mcp","sha256":"ddaf405a8fbc5c87bf007ce3bc0b56529ab51857a8ccfa0769a471455402f64c","version":3},{"created_at":"2026-06-25T19:22:14Z","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":"ba49c215d555c2134882e147d17281dc8603733cb8499b0be39f03ba14fc15d1","version":2},{"created_at":"2026-06-25T19:22:14Z","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}]}