{"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-l4yfoov9","versions":[{"created_at":"2026-06-10T13:05:38Z","element_count":83,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"2a73322c19dfd060a356f95af919d1ed41401645a981fe09f158e2d90f2de6b0","version":4}]}