{"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-48aeiagp","versions":[{"created_at":"2026-06-11T03:44:02Z","element_count":90,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"e303c2c8c57ef3878604d62110fb344308b0b93fb39a8479b3525e2e3f4912d8","version":3},{"created_at":"2026-06-11T03:35:28Z","element_count":92,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"d1ccf47c856cf9a532d7379210686b33f82932d2a021cdff17d77f932b9c2c08","version":2}]}