{"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-yh14hw7h","versions":[{"created_at":"2026-06-10T22:52:38Z","element_count":77,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 / jpy72816480→quote19615588 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"b99d4e99861234a1f34043b65b887adb7d59cac67f5b285af70355f5f908babb","version":17},{"created_at":"2026-06-10T14:29:18Z","element_count":83,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"47ef2f40f737c472599f90ddbf1f6e5136b8c9e4f2f30d276860ffa6e96f5b62","version":7}]}