{"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-z3zzd55j","versions":[{"created_at":"2026-07-24T05:54:54Z","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":"dfe13a9ecdc4405e21c68448865f263af1ffedbafd6509ce1252e1d4a8273bd8","version":2},{"created_at":"2026-07-24T05:54:44Z","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}]}