{"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-willowbrookbungalow-1kjb8owe","versions":[{"created_at":"2026-06-13T17:52:47Z","element_count":73,"note":"5軸GA polish 44->97 by M5 (autonomous)","saved_by":"mcp","sha256":"7d7a99db2375ec134d1998386ef9fb04356e674e1464dfaa19952e7e8eb0598a","version":3},{"created_at":"2026-06-13T17:48:09Z","element_count":107,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"ecd21daa87c645e69e09153d89070d16f7b03a0bf563a82e390155f912702bc8","version":2},{"created_at":"2026-06-13T17:48:07Z","element_count":107,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}