{"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-lri750o0","versions":[{"created_at":"2026-06-10T22:58:33Z","element_count":44,"note":"legacy fix: 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":"0567a26f46c26fa6a73a2d1e8d2cd10c0ede0aa67fd367eb1bf942db10d10612","version":9},{"created_at":"2026-06-10T20:07:29Z","element_count":54,"note":"5軸GA polish 60->89 by M5 (autonomous)","saved_by":"mcp","sha256":"223d50901e264fc270bb21a0e77e406604b29da8b0edf29bb4824684d0d1f169","version":2}]}