{"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-l4qtg97b","versions":[{"created_at":"2026-06-10T23:00:21Z","element_count":77,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 / jpy72816480→quote20180810 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"d11da88af43ecd9a2bf6be95ea2f63216ff8e7c856bd2b7c1f6dad1828ab27c5","version":9},{"created_at":"2026-06-10T21:11:28Z","element_count":84,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"2a7d43d765a1157573c996fe4ea1452d72720edb599722dfeeb2f5504b8fddb0","version":3}]}