{"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-n59fr4t4","versions":[{"created_at":"2026-06-10T22:56:42Z","element_count":77,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 / jpy63326340→quote22616301 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"b2602ab3dec131706b6c6ff0a88b58ce13772478ee837ddae6817f9432be80c9","version":10},{"created_at":"2026-06-10T18:46:54Z","element_count":90,"note":"5軸GA polish 61->97 by M5 (autonomous)","saved_by":"mcp","sha256":"713bb2d18456c34b6d83b8012927dbab089637dbf40084de2e298d2bf93f45e4","version":3}]}