{"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-wt0e9hxe","versions":[{"created_at":"2026-06-10T14:29:16Z","element_count":72,"note":"5軸GA polish 61->96 by M5 (autonomous)","saved_by":"mcp","sha256":"1804cc51cea43a75c7c25cb1de2f0f3eadb9c4f86812ee9138c1b2293538ab47","version":6}]}