{"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-40w0qs5m","versions":[{"created_at":"2026-06-10T22:54:40Z","element_count":77,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 / jpy90050184→quote19396944 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"7b6c74058a3a8bbebff1e8ff0b74e9acf43d7893aa6492ab509e6f5fe3e04673","version":10},{"created_at":"2026-06-10T17:56:01Z","element_count":88,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"d670baca2266d8c762c2d424b73d611a55379f28a27f6fbcd1c486a51dd11fde","version":3}]}