{"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-pjrd8nmk","versions":[{"created_at":"2026-06-10T23:05:43Z","element_count":77,"note":"legacy fix: 平屋floors2→1 / jpy90050184→quote19805192 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"a21d649b5366f8f2b48d7e530370620dc5af8dc043665f547d52e6a5756ad0e2","version":9},{"created_at":"2026-06-10T22:17:12Z","element_count":91,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"7a5fefa8955c53935873e7701b86825645e78a1ad266dc608bf06c640e61b81c","version":4}]}