{"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-d26gy8hv","versions":[{"created_at":"2026-06-10T22:53:17Z","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":"085d76af03c2cbd19a873e48f729f7fa0cffb866c8b7f5165839cfc7520807b3","version":10},{"created_at":"2026-06-10T16:55:13Z","element_count":91,"note":"5軸GA polish 60->96 by M5 (autonomous)","saved_by":"mcp","sha256":"90ed958374fcce1edcf63cd8d323bb598b7f221a469a817bd304073490ee0470","version":2}]}