{"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-jerc2hc5","versions":[{"created_at":"2026-06-10T22:53:02Z","element_count":66,"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":"72c64be37994bba453d1b99325f5d7e1dc4663b86d0f93e6ca5bfcb26a3acb4b","version":10},{"created_at":"2026-06-10T16:39:03Z","element_count":84,"note":"5軸GA polish 54->98 by M5 (autonomous)","saved_by":"mcp","sha256":"fabc5f5792ba554969ad22924d8728c0cae3f8d691d4a23adb1d8959fd51ced8","version":2}]}