{"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-hltf1kbo","versions":[{"created_at":"2026-06-10T22:58:18Z","element_count":65,"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":"8da477e28126cb1c86b77f65f18cd24f7fe3e9782b9819d867e55d146f5f8780","version":9},{"created_at":"2026-06-10T20:07:15Z","element_count":74,"note":"5軸GA polish 60->94 by M5 (autonomous)","saved_by":"mcp","sha256":"759aa4210cc94697968673e291094e0f21f588daf03b5de53e82ba15e7aef970","version":2}]}