{"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-w4q0a93n","versions":[{"created_at":"2026-06-10T22:52:39Z","element_count":77,"note":"legacy fix: 平屋floors2→1 / jpy85444799→quote19396944 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"21d451859041238766395b81aa235544bebbeed2c441be016a12e91c2b048fac","version":15},{"created_at":"2026-06-10T14:45:50Z","element_count":73,"note":"5軸GA polish 60->97 by M5 (autonomous)","saved_by":"mcp","sha256":"214a5b6db241dacfcd8028e186f9e5f8381bf1956acca9ab1fe4ab523b83ff6e","version":6}]}