{"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-1y80dpaf","versions":[{"created_at":"2026-06-10T18:46:37Z","element_count":70,"note":"5軸GA polish 61->96 by M5 (autonomous)","saved_by":"mcp","sha256":"6c557a94b0ac93845640412f091d8eb3448f14488e8f4da4168147f63d2537e0","version":3}]}