{"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-pollardlanehouse-8d5ww81l","versions":[{"created_at":"2026-06-10T22:53:38Z","element_count":77,"note":"legacy fix: jpy90050184→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":"6677f0b6a540e2bd0382163c5662edfc5a0820c0c85d4991ee44bfd304b1cc0b","version":10},{"created_at":"2026-06-10T16:55:13Z","element_count":90,"note":"5軸GA polish 43->98 by M5 (autonomous)","saved_by":"mcp","sha256":"3878ec74cc88142ebf486040e65d085960f29bb0995e420791bcbc56b802dfff","version":2}]}