{"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-r73l14h6","versions":[{"created_at":"2026-06-10T22:59:37Z","element_count":66,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 / jpy44363808→quote20764725 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"0cdcd2f6847530b24da2d02b8394c39fb1416188cfe181ed5722bbbc7761ef21","version":9},{"created_at":"2026-06-10T20:38:24Z","element_count":83,"note":"5軸GA polish 60->94 by M5 (autonomous)","saved_by":"mcp","sha256":"e65a421fe58d6d6c2c866a4e37e115c31352b30ea4eba8ef61200978bc635ca2","version":2}]}