{"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-6la41kb8","versions":[{"created_at":"2026-06-10T18:46:39Z","element_count":85,"note":"5軸GA polish 58->98 by M5 (autonomous)","saved_by":"mcp","sha256":"b70adc50c0b1094c6752513195715ccf32d1b4fbfcf4a5567d2bdad54ab57d3f","version":3}]}