{"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-ae8lzz5l","versions":[{"created_at":"2026-06-10T22:58:36Z","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":"7e6098a11a840d2517deee712520f7d40e5f83adbe11710ec6368ac31f3f325c","version":9},{"created_at":"2026-06-10T20:07:33Z","element_count":83,"note":"5軸GA polish 54->95 by M5 (autonomous)","saved_by":"mcp","sha256":"05de436f48b7a23f72f88664b27aecccce582657dfa0f8e586d984b092054dac","version":2}]}