{"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-49lvd85m","versions":[{"created_at":"2026-06-10T22:55:23Z","element_count":77,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 / jpy75041820→quote19805192 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"da86441e91a2585c77f6147e137ec559526678e39f4328fee333480b69e76f5e","version":10},{"created_at":"2026-06-10T18:13:30Z","element_count":91,"note":"5軸GA polish 59->98 by M5 (autonomous)","saved_by":"mcp","sha256":"445a94a38eb98137495f148319a62524afacff624d478b5c5878305177e10923","version":3}]}