{"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-ffruql4l","versions":[{"created_at":"2026-06-10T22:57:01Z","element_count":85,"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":"96de63be491b12626a090f0ded33123c9a3842926ffb231ba338d15cfb786667","version":9},{"created_at":"2026-06-10T19:02:38Z","element_count":84,"note":"5軸GA polish 60->95 by M5 (autonomous)","saved_by":"mcp","sha256":"2e85e0907f2a6952525169aa44b01513ecacd4dd39341e3e7c0560c585ce81b0","version":2}]}