{"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-xda075et","versions":[{"created_at":"2026-06-10T07:25:47Z","element_count":83,"note":"5軸GA polish 57->98 by M5 (autonomous)","saved_by":"mcp","sha256":"f472c973c385550c03a7dfa9536ac0f941fa619492a0b4be4da89a38a413fdc8","version":2}]}