{"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-gentlehillbungalow-wp46do2s","versions":[{"created_at":"2026-06-13T18:19:36Z","element_count":84,"note":"5軸GA polish 47->98 by M5 (autonomous)","saved_by":"mcp","sha256":"f8e60842326088ca9281a9c72a21cfd0e56e6805836d0ab204e2f88d99c9edfc","version":3},{"created_at":"2026-06-13T18:13:42Z","element_count":90,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"a1484723319a6470c70aca364062b72d9a9bb08fc82ef10f47ea17d4112ff158","version":2},{"created_at":"2026-06-13T18:13:40Z","element_count":90,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}