{"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-rt6883ws","versions":[{"created_at":"2026-06-10T22:57:16Z","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":"f181b573eeb7070c0de4a9130d4061a92367bc5dd8d136b3a95b2840d086d618","version":9},{"created_at":"2026-06-10T19:18:59Z","element_count":84,"note":"5軸GA polish 60->95 by M5 (autonomous)","saved_by":"mcp","sha256":"aa75c526b4e8b0737da602b092548f09c4791ea12a02deb9e3622c4898fa30c2","version":2}]}