{"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-xq6p6pbg","versions":[{"created_at":"2026-06-10T22:53:01Z","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":"33a7e86e95f99d09a17049555be3d74fc57fd1e888c9a9890fcc6874dc45337c","version":10},{"created_at":"2026-06-10T16:39:31Z","element_count":90,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"159f285c617a7db0c521799ac337cd5cf426a2f70c825c13724d3b96bef87f5b","version":2}]}