{"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-vv2rhg2p","versions":[{"created_at":"2026-06-10T22:55:33Z","element_count":63,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 / jpy85444799→quote20857152 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"108e42ce54f6f7bdae0987f59e8c6bfda606a995f766206727b18d40f582cfd5","version":10},{"created_at":"2026-06-10T18:14:03Z","element_count":72,"note":"5軸GA polish 59->97 by M5 (autonomous)","saved_by":"mcp","sha256":"8b71bd181fa365861adf54f18b166ab933a87154641fa50a8aad4ad68b32a772","version":3}]}