{"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-dihst9zi","versions":[{"created_at":"2026-06-10T22:59:37Z","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":"cee2ab1c300d5b059a1f0e8fe56fed80a435e0dbdee2d9206586476a32ea8069","version":9},{"created_at":"2026-06-10T20:38:23Z","element_count":83,"note":"5軸GA polish 60->96 by M5 (autonomous)","saved_by":"mcp","sha256":"a86836525a93031dc596ba6cc253fdc1f1259591a10c37d6e4e17bb77b8aed47","version":2}]}