{"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-iex6okfb","versions":[{"created_at":"2026-06-10T22:52:49Z","element_count":85,"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":"a5b8128bd59667cf2b8c71bc24e8ba42cc7271693f632655fc537b57e8948d8d","version":10},{"created_at":"2026-06-10T16:23:19Z","element_count":71,"note":"5軸GA polish 54->94 by M5 (autonomous)","saved_by":"mcp","sha256":"54520fb70fd634a640b5ced14869a1bc5780193b16d1f4037f9e495269a3e229","version":2}]}