{"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-9jm2mytv","versions":[{"created_at":"2026-06-11T01:05:14Z","element_count":83,"note":"5軸GA polish 47->98 by M5 (autonomous)","saved_by":"mcp","sha256":"92984aab4688671db60eaf2384ba005a79e4584fa4adb8283c1dfce73837db45","version":13},{"created_at":"2026-06-10T22:26:08Z","element_count":50,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"24345115c5ab032bac3693f1d99d16ce0011df4336ee235e215873c8f2584d27","version":2}]}