{"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-6p7xf7ly","versions":[{"created_at":"2026-06-30T06:07:02Z","element_count":89,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"c516c0fb3815dce61a4c0f7d51fb4f382e20eb4d8137adf194b72deb8dd73d6c","version":3},{"created_at":"2026-06-30T06:01:32Z","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":"5e8a5727393be18f95c024131112d7584790a7cfd73189f2e44def4b462195f7","version":2},{"created_at":"2026-06-30T06:01:32Z","element_count":90,"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}]}