{"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-3cjzr4z1","versions":[{"created_at":"2026-06-10T22:52:37Z","element_count":65,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 / jpy102533759→quote21473216 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"149444e177a3a42e2cdd037eda138d56253ecb2c505d66f474a89b1f35ab9cfa","version":17},{"created_at":"2026-06-10T14:29:19Z","element_count":71,"note":"5軸GA polish 56->97 by M5 (autonomous)","saved_by":"mcp","sha256":"c647ebef04bd2a0f458eb1666d2531e04f20af769c6e07667f691c4d0575490f","version":7}]}