{"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-5fo8u84i","versions":[{"created_at":"2026-06-10T22:57:41Z","element_count":63,"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":"2ee4a637c3c2fa1f1ad2a1951608b00648d3270241bd88fbc8e7d965b9e5398a","version":9},{"created_at":"2026-06-10T19:34:22Z","element_count":90,"note":"5軸GA polish 60->95 by M5 (autonomous)","saved_by":"mcp","sha256":"9691de2a73fdd4f6f18b1314c91c1fd777e05981d6b12225cb962e7c72eb01ee","version":2}]}