{"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-j2otecsy","versions":[{"created_at":"2026-06-11T00:48:09Z","element_count":90,"note":"5軸GA polish 47->97 by M5 (autonomous)","saved_by":"mcp","sha256":"a9915edc0557f8ebab3412f70193d27318d9c111e482dff28382828ffc86921e","version":15},{"created_at":"2026-06-10T21:57:56Z","element_count":54,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"e26e26dd21e0a1dd7f4448385256cdd7293e790836f611ebf6ed7af1117db1a0","version":2}]}