{"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-3mc1vt3s","versions":[{"created_at":"2026-06-10T23:00:35Z","element_count":63,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 / jpy87413760→quote24278376 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"a887e0b85c50428081621c3bf1d872b6146431ce7a8b1ad617024cbf6396caf2","version":9},{"created_at":"2026-06-10T21:28:40Z","element_count":71,"note":"5軸GA polish 54->94 by M5 (autonomous)","saved_by":"mcp","sha256":"ac5ccc9af0024e4543f11ddbedabd0d56aa433d9b063eab0bfde2d37e009bbe2","version":3}]}