{"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-j0ov4gp3","versions":[{"created_at":"2026-06-10T23:06:36Z","element_count":85,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 / jpy72816480→quote20863604 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"5331bc362a567d1ea37890987df2f6f1b044259b2e1d2fcc2f0b361ace958f21","version":9},{"created_at":"2026-06-10T22:34:39Z","element_count":85,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"3d4b59c260946d0c665d5b5be306d36da68fdf9d13b1094967d6c6ac387af185","version":6}]}