{"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-willowbrookhouse-mg04htwc","versions":[{"created_at":"2026-06-17T15:24:58Z","element_count":72,"note":"5軸GA polish 48->97 by M5 (autonomous)","saved_by":"mcp","sha256":"d84e604f937f6ba8877fb4f5e9751614213844242a2d26db517becee3433fbc0","version":3},{"created_at":"2026-06-17T15:24:25Z","element_count":111,"note":"loop3: 設計時延床 130.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"cf982467ec65a8df7c5e8629e527cf5a9abce03c5281fa544c7755e38a942f2e","version":2},{"created_at":"2026-06-17T15:24:23Z","element_count":111,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}