{"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-3k0qanrj","versions":[{"created_at":"2026-06-10T22:58:35Z","element_count":63,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"84a18c6c804437fadbf6cc163a9de766aab0f7a843e2d794fedfc4ccc50f5cf0","version":9},{"created_at":"2026-06-10T20:07:07Z","element_count":90,"note":"5軸GA polish 60->97 by M5 (autonomous)","saved_by":"mcp","sha256":"e3aa5b41ec1808660bf948993b62fd12151927268190fbc43934fa4b2865f412","version":2}]}