{"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-thewillowhouse-uw3341e2","versions":[{"created_at":"2026-06-26T12:06:22Z","element_count":73,"note":"5軸GA polish 38->90 by M5 (autonomous)","saved_by":"mcp","sha256":"0288d7b7d55cfc773d4c4593e08b9e379886e9ac991aaf80a417cfdc97d7bc6c","version":3},{"created_at":"2026-06-26T12:03:49Z","element_count":119,"note":"loop3: 設計時延床 55.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"cb2b732424c14fc90689903ea3f821cafa7050c1ae212961e62b9a1555b1ef9d","version":2},{"created_at":"2026-06-26T12:03:49Z","element_count":119,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}