{"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-yfwenemt","versions":[{"created_at":"2026-06-10T22:57:29Z","element_count":77,"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":"ea51bdea8f9b14454cd2dbf158429f32facc523df190d26026deac2ad0a1b53e","version":9},{"created_at":"2026-06-10T19:18:50Z","element_count":92,"note":"5軸GA polish 54->94 by M5 (autonomous)","saved_by":"mcp","sha256":"703b63d6de4666c201d411ad4774dd689b5027e2a064c108e7d3564ca09eda70","version":2}]}