{"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-hvzht6n9","versions":[{"created_at":"2026-07-01T06:56:33Z","element_count":69,"note":"5軸GA polish 42->93 by M5 (autonomous)","saved_by":"mcp","sha256":"acacad76d006ee543151090aaca8922cd8d56f8e04760d0b2c85f106f9479fc2","version":3},{"created_at":"2026-07-01T06:44:27Z","element_count":103,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"b7cd8848f97230368f186bf830ecc780594affe74324491b8a7473204f633e3d","version":2},{"created_at":"2026-07-01T06:44:26Z","element_count":103,"note":"言葉から生成: LDK+主寝室+子供室2+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}