{"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-crescentviewhouse-7c2glca9","versions":[{"created_at":"2026-06-10T17:08:49Z","element_count":83,"note":"5軸GA polish 43->98 by M5 (autonomous)","saved_by":"mcp","sha256":"c2c73c2b7539a76b5c9c61378ffdfd54e4a1d043a28b3fd181f415331d2be69e","version":2}]}