{"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-c1xfs4ro","versions":[{"created_at":"2026-06-10T22:52:42Z","element_count":77,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 / jpy87379776→quote19396944 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"09aa8e0bae4f1995d1fdd4160b6f4710488214fedaf23b17035a850149a144c9","version":13},{"created_at":"2026-06-10T15:19:16Z","element_count":85,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"ab3bd7b10ec51ae54147bca7306b4bafb779b7a68e734a8fa8108e95b8755936","version":5}]}