{"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-xbh4a5iy","versions":[{"created_at":"2026-06-10T22:55:56Z","element_count":85,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 / jpy90050184→quote21288702 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"c59c9874faaf79ae20c904158fd951d0555f071819a67142d7ef96d83e41824f","version":10},{"created_at":"2026-06-10T18:29:56Z","element_count":90,"note":"5軸GA polish 53->98 by M5 (autonomous)","saved_by":"mcp","sha256":"5f27155ba03f4d9215df44d1ec2730818a42e3ee4dd2a64f44b888dfb8764ae3","version":3}]}