{"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-rq9l7ph4","versions":[{"created_at":"2026-06-10T22:57:37Z","element_count":66,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 / jpy50261601→quote23104426 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"e26089013b08b03e0988a2bcab69aa2a65a33ef44df254464a8a6843848c2abe","version":9},{"created_at":"2026-06-10T19:34:24Z","element_count":89,"note":"5軸GA polish 54->93 by M5 (autonomous)","saved_by":"mcp","sha256":"e95959633986e0f32b68f57303d383f9d492351cd91ae70554e2c14af5a65fc4","version":2}]}