{"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-ta005p56","versions":[{"created_at":"2026-06-10T16:55:13Z","element_count":90,"note":"5軸GA polish 54->95 by M5 (autonomous)","saved_by":"mcp","sha256":"403aed8d21041fc5ad2fdf2df3b7bb86b753ee2748d652ff2649ff08a1cd17bd","version":2}]}