{"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-u584x5ay","versions":[{"created_at":"2026-06-10T22:52:42Z","element_count":77,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 / jpy102533759→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":"1b22783fd6d78113c36254d77291ac50521a37bf5f19474029a934bcae575bbc","version":13},{"created_at":"2026-06-10T15:19:18Z","element_count":72,"note":"5軸GA polish 54->97 by M5 (autonomous)","saved_by":"mcp","sha256":"bc8fc80771b6cea464167c49950110808decf91d8ac297b9788eb267bd626463","version":5}]}