{"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-wwh5bkw5","versions":[{"created_at":"2026-06-10T23:00:48Z","element_count":85,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 / jpy72816480→quote20693313 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"a190060680181863c922f0c45c3ad1a686d656b492e62982de540229fa871e2a","version":9},{"created_at":"2026-06-10T21:44:05Z","element_count":83,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"4d617f5d13effa39f72b54c154572d89df4a8cd05c0da07015fb2b8d34e0c025","version":3}]}