{"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-0c62jfvr","versions":[{"created_at":"2026-06-10T22:58:12Z","element_count":85,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"8155dc23c10dedfe4d6488c6528fe4315df0139dec47dd1db6afd13435faafd6","version":9},{"created_at":"2026-06-10T19:50:40Z","element_count":84,"note":"5軸GA polish 58->95 by M5 (autonomous)","saved_by":"mcp","sha256":"08de81ad4e84c9990f140fd7da658b71bb3a0668ea453b50f93b94d2a79fc4e6","version":2}]}