{"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-dcbgyk0w","versions":[{"created_at":"2026-06-11T00:48:26Z","element_count":68,"note":"5軸GA polish 47->96 by M5 (autonomous)","saved_by":"mcp","sha256":"ce7bb5d53c14875d579ddeb36ef634bef12d4891ad0da3ca034a2d21f25a9294","version":15},{"created_at":"2026-06-10T21:58:22Z","element_count":44,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"6e4c73ae8c7d66ca117cfbfa2978fe93acd0bd5a682b9b0b1cb840f6c2d1b02f","version":2}]}