{"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-willowbrookhouse-lm6tuhnd","versions":[{"created_at":"2026-06-13T19:45:41Z","element_count":74,"note":"5軸GA polish 44->97 by M5 (autonomous)","saved_by":"mcp","sha256":"fe6313710614d630e94bdea433f5fdaa9b9a97ee736c3c594b321ad51adee5c2","version":3},{"created_at":"2026-06-13T19:26:35Z","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":"3372188d1a00ebf2adae948d9a8bac5a0c478b386dd84ff9f762889a86cd6f4e","version":2},{"created_at":"2026-06-13T19:26:34Z","element_count":90,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}