{"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-f39zoo1k","versions":[{"created_at":"2026-07-15T20:21:54Z","element_count":84,"note":"5軸GA polish 44->97 by M5 (autonomous)","saved_by":"mcp","sha256":"75aa02860143f10c063c1c9d77d6928f9a05e46d2ec05c66c90e50c966eedcf9","version":3},{"created_at":"2026-07-15T20:14:42Z","element_count":85,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"af71f953baa9f924820084bda7212a26e01e58da2e6ff0edaea280512f51522a","version":2},{"created_at":"2026-07-15T20:14:42Z","element_count":85,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}