{"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-5a3rz9a7","versions":[{"created_at":"2026-06-10T22:59:43Z","element_count":77,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 / jpy96334560→quote21081401 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"e7d3b577c021540f968667d99897dfce9bb66711ba0c93790bfd98fc827e62d4","version":9},{"created_at":"2026-06-10T20:54:22Z","element_count":72,"note":"5軸GA polish 59->96 by M5 (autonomous)","saved_by":"mcp","sha256":"2d449bcbaf2074e05019ca26496b43f95e44c1e91316770e378dffecb6001d1e","version":3}]}