Detect wallet cluster: given seed address, trace USDC funding source backwards then find sibling addresses funded by same source within last 30 days

Detect wallet cluster: given seed address, trace USDC funding source backwards then find sibling addresses funded by same source within last 30 days. Returns funder address, first funding tx, cluster_size, siblings array (up to 50), pattern classification (burner_cluster, linked_addresses, single_sibling, no_funding_found). For sybil detection, treasury monitoring, source-of-funds analysis.