{"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-b8v4uhnx","versions":[{"created_at":"2026-06-13T14:35:25Z","element_count":84,"note":"5軸GA polish 41->94 by M5 (autonomous)","saved_by":"mcp","sha256":"6d66ef09a64151569cf4d09dd1ea36a50d6f396ae71a48f3e0bc6b0956d1c387","version":3},{"created_at":"2026-06-13T14:29:05Z","element_count":85,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"0a55db8dc48544259155460b1e208f074df98c03449776f38f2952fd695ea90f","version":2},{"created_at":"2026-06-13T14:29:04Z","element_count":85,"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}]}