{"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-kzuy82jq","versions":[{"created_at":"2026-06-10T22:58:34Z","element_count":66,"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":"0a1aacca1c17f148f4683c19a7fe4ae89137d7c6fa14f9cf15d611f9426cc50b","version":9},{"created_at":"2026-06-10T20:07:30Z","element_count":90,"note":"5軸GA polish 60->94 by M5 (autonomous)","saved_by":"mcp","sha256":"d21ca1ccc75e39ffac3ac087621c265024d41f01a20439501fb4011b7559b785","version":2}]}