{"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-xpuqbjou","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":"1db93345967ace114f3b4c7c5ca9e75d54ed7ded7e52f06bfcaf32e23e4e70d5","version":10},{"created_at":"2026-06-10T16:23:28Z","element_count":74,"note":"5軸GA polish 60->95 by M5 (autonomous)","saved_by":"mcp","sha256":"3f44e88ba7760c045769d058ee5c442f3648a6c4186ca497afd6fdb88bb47f64","version":2}]}