{"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-151pgy7c","versions":[{"created_at":"2026-06-10T22:52:49Z","element_count":62,"note":"legacy fix: 平屋floors2→1 / jpy72816480→quote20965218 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"187b2df2255b3c61ce6347d6ee18ec31f812506403113c8cebe1d65d7dab12a4","version":10},{"created_at":"2026-06-10T16:39:37Z","element_count":83,"note":"5軸GA polish 45->98 by M5 (autonomous)","saved_by":"mcp","sha256":"7fb8e46c1e4e148875181bd35f9c9ab7fdcf4f470ecabea18f5b26962718f55f","version":2}]}