{"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-3dp8fbg1","versions":[{"created_at":"2026-06-10T23:06:53Z","element_count":91,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 / jpy75991608→quote22853414 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"df5f4281de58d6aa5b95495fee72c07ac40a30b7bb02a3423352ef904a5e004e","version":9},{"created_at":"2026-06-10T22:52:05Z","element_count":91,"note":"5軸GA polish 54->97 by M5 (autonomous)","saved_by":"mcp","sha256":"da8df8f8b01ab6b63618d2d00e7411dd034d913b566abeecf70d1202e4ddbfff","version":8}]}