{"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-5kdh5afl","versions":[{"created_at":"2026-06-10T22:52:49Z","element_count":77,"note":"legacy fix: 平屋floors2→1 / rooms設備語除去 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"f7a4c37898d4485be556c320ee94ff2fee2345179cec96585adfe89ff209a9a7","version":10},{"created_at":"2026-06-10T16:23:33Z","element_count":72,"note":"5軸GA polish 60->95 by M5 (autonomous)","saved_by":"mcp","sha256":"f1436b928c4f0c04d2a1c85513258c2597abe6627cf3b74b8efe442c140585b9","version":2}]}